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  • Spring MVC 文件上传 & 文件下载

    索引:

    目录索引

    参看代码 GitHub:

    pom.xml

    WebConfig.java

    index.jsp

    upload.jsp

    FileUploadController.java

    Files_Utils_DG.java

    一、要点讲解

      1.引入文件上传下载的类库

      commons-fileupload

      commons-io

      2.配置 MultipartResolver 组件(bean)

      @Bean public MultipartResolver multipartResolver() : 该组件用来 解析 http multipart 类型的请求体

      3.配置静态文件的请求

      @Override public void addResourceHandlers(ResourceHandlerRegistry registry) :

        该方法中注册请求资源路径,以便 href 链接中静态资源的请求链接与下载。

        registry.addResourceHandler("/files/**").addResourceLocations("classpath:/files/");

      4.添加页面快捷转向,这样就不用写没有逻辑仅做页面转向的 Controller 了

        @Override public void addViewControllers(ViewControllerRegistry registry):

          registry.addViewController("/upload").setViewName("fileupload/upload");

      5.前台表单中的设置

        enctype="multipart/form-data" :在 form 表单中必须指定为 multipart 

        fileElementId:'file_AjaxFile' :在 ajax 中要指定 <input type="file"> 的 id 

      6.后台中接收设置

        @RequestParam("file_upload") MultipartFile multipartFile : 在方法参数中这样指定后,就可以从请求体中读取上传的文件及文件信息了

      7.其它详细细节可具体参看代码,及代码中的解释

       ... ...

    二、详细使用及代码

      1.pom.xml

      1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      2          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
      3     <parent>
      4         <artifactId>solution</artifactId>
      5         <groupId>lm.solution</groupId>
      6         <version>1.0-SNAPSHOT</version>
      7     </parent>
      8     <modelVersion>4.0.0</modelVersion>
      9     <groupId>lm.solution</groupId>
     10     <artifactId>web</artifactId>
     11     <packaging>war</packaging>
     12     <version>1.0-SNAPSHOT</version>
     13     <name>web Maven Webapp</name>
     14     <url>http://maven.apache.org</url>
     15     <dependencies>
     16         <!--Module-->
     17         <dependency>
     18             <groupId>lm.solution</groupId>
     19             <artifactId>service</artifactId>
     20             <version>1.0-SNAPSHOT</version>
     21         </dependency>
     22         <dependency>
     23             <groupId>lm.solution</groupId>
     24             <artifactId>common</artifactId>
     25             <version>1.0-SNAPSHOT</version>
     26         </dependency>
     27 
     28         <!--Libary-->
     29         <!--spring mvc-->
     30         <dependency>
     31             <groupId>org.springframework</groupId>
     32             <artifactId>spring-webmvc</artifactId>
     33         </dependency>
     34         <!--cglib-->
     35         <dependency>
     36             <groupId>cglib</groupId>
     37             <artifactId>cglib</artifactId>
     38         </dependency>
     39         <!-- mybatis核心包 -->
     40         <dependency>
     41             <groupId>org.mybatis</groupId>
     42             <artifactId>mybatis</artifactId>
     43         </dependency>
     44         <!--mybatis spring 插件 -->
     45         <dependency>
     46             <groupId>org.mybatis</groupId>
     47             <artifactId>mybatis-spring</artifactId>
     48         </dependency>
     49         <!-- Mysql数据库驱动包 -->
     50         <dependency>
     51             <groupId>mysql</groupId>
     52             <artifactId>mysql-connector-java</artifactId>
     53         </dependency>
     54         <!-- connection pool -->
     55         <dependency>
     56             <groupId>com.alibaba</groupId>
     57             <artifactId>druid</artifactId>
     58             <!--<scope>runtime</scope>-->
     59         </dependency>
     60         <!--servlet-->
     61         <dependency>
     62             <groupId>javax.servlet</groupId>
     63             <artifactId>javax.servlet-api</artifactId>
     64             <scope>provided</scope>
     65         </dependency>
     66         <dependency>
     67             <groupId>javax.servlet.jsp</groupId>
     68             <artifactId>jsp-api</artifactId>
     69             <scope>provided</scope>
     70         </dependency>
     71         <dependency>
     72             <groupId>javax.servlet</groupId>
     73             <artifactId>jstl</artifactId>
     74         </dependency>
     75         <!-- 映入JSON lib -->
     76         <dependency>
     77             <groupId>net.sf.json-lib</groupId>
     78             <artifactId>json-lib</artifactId>
     79             <classifier>jdk15</classifier>
     80         </dependency>
     81         <!-- 用dom4j解析xml文件 -->
     82         <dependency>
     83             <groupId>dom4j</groupId>
     84             <artifactId>dom4j</artifactId>
     85         </dependency>
     86         <!-- ehcache -->
     87         <dependency>
     88             <groupId>net.sf.ehcache</groupId>
     89             <artifactId>ehcache-core</artifactId>
     90         </dependency>
     91         <dependency>
     92             <groupId>net.sf.ehcache</groupId>
     93             <artifactId>ehcache-web</artifactId>
     94         </dependency>
     95         <!-- 上传组件包 -->
     96         <dependency>
     97             <groupId>commons-fileupload</groupId>
     98             <artifactId>commons-fileupload</artifactId>
     99         </dependency>
    100         <dependency>
    101             <groupId>commons-io</groupId>
    102             <artifactId>commons-io</artifactId>
    103         </dependency>
    104         <!-- common others -->
    105         <dependency>
    106             <groupId>commons-codec</groupId>
    107             <artifactId>commons-codec</artifactId>
    108         </dependency>
    109         <dependency>
    110             <groupId>org.apache.commons</groupId>
    111             <artifactId>commons-collections4</artifactId>
    112         </dependency>
    113         <dependency>
    114             <groupId>org.apache.commons</groupId>
    115             <artifactId>commons-lang3</artifactId>
    116         </dependency>
    117         <!-- commons-beanutils -->
    118         <dependency>
    119             <groupId>commons-beanutils</groupId>
    120             <artifactId>commons-beanutils</artifactId>
    121             <exclusions>
    122                 <exclusion>
    123                     <groupId>commons-logging</groupId>
    124                     <artifactId>commons-logging</artifactId>
    125                 </exclusion>
    126             </exclusions>
    127         </dependency>
    128         <!-- freemarker -->
    129         <dependency>
    130             <groupId>org.freemarker</groupId>
    131             <artifactId>freemarker</artifactId>
    132         </dependency>
    133         <!-- org.apache.httpcomponents -->
    134         <dependency>
    135             <groupId>org.apache.httpcomponents</groupId>
    136             <artifactId>httpcore</artifactId>
    137         </dependency>
    138         <dependency>
    139             <groupId>org.apache.httpcomponents</groupId>
    140             <artifactId>httpclient</artifactId>
    141         </dependency>
    142         <!-- redis.clients/jedis -->
    143         <dependency>
    144             <groupId>redis.clients</groupId>
    145             <artifactId>jedis</artifactId>
    146         </dependency>
    147         <!-- com.rabbitmq/amqp-client -->
    148         <dependency>
    149             <groupId>com.rabbitmq</groupId>
    150             <artifactId>amqp-client</artifactId>
    151         </dependency>
    152         <!-- com.alibaba/fastjson -->
    153         <dependency>
    154             <groupId>com.alibaba</groupId>
    155             <artifactId>fastjson</artifactId>
    156         </dependency>
    157     </dependencies>
    158     <build>
    159         <finalName>web</finalName>
    160 
    161         <plugins>
    162             <plugin>
    163                 <groupId>org.apache.tomcat.maven</groupId>
    164                 <artifactId>tomcat8-maven-plugin</artifactId>
    165             </plugin>
    166         </plugins>
    167     </build>
    168 </project>

      2.WebConfig.java

      1 package lm.solution.web.config.configs;
      2 
      3 import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
      4 import lm.solution.common.web.messageconverter.CustomMessageConverter;
      5 import lm.solution.web.config.beans.TimerInterceptor;
      6 import org.springframework.context.annotation.Bean;
      7 import org.springframework.context.annotation.ComponentScan;
      8 import org.springframework.context.annotation.Configuration;
      9 import org.springframework.http.MediaType;
     10 import org.springframework.http.converter.HttpMessageConverter;
     11 import org.springframework.web.multipart.MultipartResolver;
     12 import org.springframework.web.multipart.commons.CommonsMultipartResolver;
     13 import org.springframework.web.servlet.config.annotation.*;
     14 import org.springframework.web.servlet.view.InternalResourceViewResolver;
     15 import org.springframework.web.servlet.view.JstlView;
     16 
     17 import java.util.ArrayList;
     18 import java.util.List;
     19 
     20 @Configuration
     21 /**
     22  * @EnableWebMvc 注解会开启一些默认配置,如:ViewResolver MessageConverter 等,
     23  * 若无此注解,重写 WebMvcConfigurerAdapter 方法无效
     24  * */
     25 @EnableWebMvc
     26 @ComponentScan(value = {
     27         "lm.solution.web",
     28         "lm.solution.service.mysql",
     29         "lm.solution.service.webtest"
     30 })
     31 /**
     32  * 继承 WebMvcConfigurerAdapter 类,重写其方法可对 spring mvc 进行配置
     33  * */
     34 public class WebConfig extends WebMvcConfigurerAdapter {
     35 
     36     // 重写 addViewControllers 简化页面快捷转向,这样就可以不用配置 Controller 了
     37     @Override
     38     public void addViewControllers(ViewControllerRegistry registry) {
     39 
     40         registry.addViewController("/").setViewName("index");
     41         registry.addViewController("/error").setViewName("error/error");
     42         registry.addViewController("/excel").setViewName("excel/excel");
     43         // 文件上传下载
     44         registry.addViewController("/upload").setViewName("fileupload/upload");
     45         registry.addViewController("/ImageValidateCodeLogin").setViewName("login/imageValidateCodeLogin");
     46         registry.addViewController("/restfulapi").setViewName("restful/user");
     47         registry.addViewController("/jaxwsri").setViewName("jaxwsri/wsri");
     48         registry.addViewController("/redis").setViewName("redis/jedis");
     49         registry.addViewController("/mybatisPage").setViewName("db/mybatis");
     50         registry.addViewController("/messageconverter").setViewName("httpmessageconverter/customconverter");
     51         registry.addViewController("/sse").setViewName("serverpushmessage/sse");
     52 
     53     }
     54 
     55     // 配置JSP视图解析器
     56     @Bean
     57     public InternalResourceViewResolver viewResolver() {
     58         InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
     59         /**
     60          * views 在 /resources/ 下
     61          * */
     62         // 前缀
     63         viewResolver.setPrefix("/WEB-INF/classes/views/");
     64         // 后缀
     65         viewResolver.setSuffix(".jsp");
     66         viewResolver.setViewClass(JstlView.class);
     67         viewResolver.setContentType("text/html");
     68         // 可以在JSP页面中通过${}访问beans
     69         viewResolver.setExposeContextBeansAsAttributes(true);
     70         return viewResolver;
     71     }
     72 
     73     // 配置springMVC处理上传文件的信息
     74     @Bean
     75     public MultipartResolver multipartResolver() {
     76         CommonsMultipartResolver resolver = new CommonsMultipartResolver();
     77         resolver.setDefaultEncoding("UTF-8");
     78         resolver.setMaxUploadSize(10485760000L);
     79         resolver.setMaxInMemorySize(40960);
     80         return resolver;
     81     }
     82 
     83     // 配置静态文件处理
     84     @Override
     85     public void addResourceHandlers(ResourceHandlerRegistry registry){
     86 
     87         /**
     88          * addResourceHandler 指的是对外暴露的访问路径
     89          * addResourceLocations 指的是文件放置的目录
     90          * */
     91         registry.addResourceHandler("/assets/**")
     92                 .addResourceLocations("classpath:/assets/");
     93 
     94         // href 链接方式 下载文件
     95         registry.addResourceHandler("/files/**")
     96                 .addResourceLocations("classpath:/files/");
     97 
     98         /**
     99          * 解决 No handler found for GET /favicon.ico 异常
    100          * */
    101         registry.addResourceHandler("/favicon.ico")
    102                 .addResourceLocations("classpath:/favicon.ico");
    103 
    104     }
    105 
    106     // 重写 configurePathMatch ,改变路径参数匹配
    107     @Override
    108     public void configurePathMatch(PathMatchConfigurer configurer) {
    109 
    110         /**
    111          * Spring mvc 默认 如果路径参数后面带点,如 “/mm/nn/xx.yy” 后面的yy值将被忽略
    112          * 加入下面的配置,就不会忽略“.”后面的参数了
    113          * */
    114         configurer.setUseSuffixPatternMatch(false);
    115 
    116     }
    117 
    118 //
    119 //    // 负责读取二进制格式的数据和写出二进制格式的数据;
    120 //    @Bean
    121 //    public ByteArrayHttpMessageConverter byteArrayHttpMessageConverter() {
    122 //
    123 //        return new ByteArrayHttpMessageConverter();
    124 //
    125 //    }
    126 //
    127 //    // 负责读取字符串格式的数据和写出字符串格式的数据;
    128 //    @Bean
    129 //    public StringHttpMessageConverter stringHttpMessageConverter() {
    130 //
    131 //        StringHttpMessageConverter messageConverter = new StringHttpMessageConverter();
    132 //        messageConverter.setDefaultCharset(Charset.forName("UTF-8"));
    133 //        return messageConverter;
    134 //
    135 //    }
    136 //
    137 //    // 负责读取资源文件和写出资源文件数据;
    138 //    @Bean
    139 //    public ResourceHttpMessageConverter resourceHttpMessageConverter() {
    140 //
    141 //        return new ResourceHttpMessageConverter();
    142 //
    143 //    }
    144 //
    145 //    /**
    146 //     * 负责读取form提交的数据
    147 //     * 能读取的数据格式为 application/x-www-form-urlencoded,
    148 //     * 不能读取multipart/form-data格式数据;
    149 //     * 负责写入application/x-www-from-urlencoded和multipart/form-data格式的数据;
    150 //     */
    151 //    @Bean
    152 //    public FormHttpMessageConverter formHttpMessageConverter() {
    153 //
    154 //        return new FormHttpMessageConverter();
    155 //
    156 //    }
    157 //
    158 //    // 负责读取和写入json格式的数据;
    159 //    /**
    160 //     * 配置 fastjson 中实现 HttpMessageConverter 接口的转换器
    161 //     * FastJsonHttpMessageConverter 是 fastjson 中实现了 HttpMessageConverter 接口的类
    162 //     */
    163 //    @Bean(name = "fastJsonHttpMessageConverter")
    164 //    public FastJsonHttpMessageConverter fastJsonHttpMessageConverter() {
    165 //        //
    166 //        String txtHtml = "text/html;charset=UTF-8";
    167 //        String txtJson = "text/json;charset=UTF-8";
    168 //        String appJson = "application/json;charset=UTF-8";
    169 //
    170 //        // 这里顺序不能反,一定先写 text/html,不然 IE 下会出现下载提示
    171 //        List<MediaType> mediaTypes = new ArrayList<>();
    172 //        mediaTypes.add(MediaType.parseMediaType(txtHtml));
    173 //        mediaTypes.add(MediaType.parseMediaType(txtJson));
    174 //        mediaTypes.add(MediaType.parseMediaType(appJson));
    175 //
    176 //        // 加入支持的媒体类型,返回 contentType
    177 //        FastJsonHttpMessageConverter fastjson = new FastJsonHttpMessageConverter();
    178 //        fastjson.setSupportedMediaTypes(mediaTypes);
    179 //        return fastjson;
    180 //
    181 //    }
    182 //
    183 //    // 负责读取和写入 xml 中javax.xml.transform.Source定义的数据;
    184 //    @Bean
    185 //    public SourceHttpMessageConverter sourceHttpMessageConverter() {
    186 //
    187 //        return new SourceHttpMessageConverter();
    188 //
    189 //    }
    190 //
    191 //    // 负责读取和写入xml 标签格式的数据;
    192 //    @Bean
    193 //    public Jaxb2RootElementHttpMessageConverter jaxb2RootElementHttpMessageConverter() {
    194 //
    195 //        return new Jaxb2RootElementHttpMessageConverter();
    196 //
    197 //    }
    198 //
    199 //    // 注册消息转换器
    200 //    /**
    201 //     * 重写 configureMessageConverters 会覆盖掉 spring mvc 默认注册的多个 HttpMessageConverter
    202 //     * 所以 推荐使用 extendMessageConverter
    203 //     * */
    204 //    /**
    205 //     * Error:
    206 //     * 400:(错误请求) 服务器不理解请求的语法。
    207 //     * 415:(不支持的媒体类型) 请求的格式不受请求页面的支持。
    208 //     */
    209 //    @Override
    210 //    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
    211 //
    212 //        converters.add(this.byteArrayHttpMessageConverter());
    213 //        converters.add(this.stringHttpMessageConverter());
    214 //        converters.add(this.resourceHttpMessageConverter());
    215 //        converters.add(this.formHttpMessageConverter());
    216 //        converters.add(this.fastJsonHttpMessageConverter());
    217 //        converters.add(this.sourceHttpMessageConverter());
    218 //        converters.add(this.jaxb2RootElementHttpMessageConverter());
    219 //
    220 //    }
    221 
    222     // 自定义 HttpMessageConverter
    223     @Bean
    224     public CustomMessageConverter customMessageConverter(){
    225 
    226         return new CustomMessageConverter();
    227 
    228     }
    229 
    230     // 负责读取和写入json格式的数据;
    231     /**
    232      * 配置 fastjson 中实现 HttpMessageConverter 接口的转换器
    233      * FastJsonHttpMessageConverter 是 fastjson 中实现了 HttpMessageConverter 接口的类
    234      */
    235     @Bean(name = "fastJsonHttpMessageConverter")
    236     public FastJsonHttpMessageConverter fastJsonHttpMessageConverter() {
    237         //
    238         String txtHtml = "text/html;charset=UTF-8";
    239         String txtJson = "text/json;charset=UTF-8";
    240         String appJson = "application/json;charset=UTF-8";
    241 
    242         // 这里顺序不能反,一定先写 text/html,不然 IE 下会出现下载提示
    243         List<MediaType> mediaTypes = new ArrayList<>();
    244         mediaTypes.add(MediaType.parseMediaType(txtHtml));
    245         mediaTypes.add(MediaType.parseMediaType(txtJson));
    246         mediaTypes.add(MediaType.parseMediaType(appJson));
    247 
    248         // 加入支持的媒体类型,返回 contentType
    249         FastJsonHttpMessageConverter fastjson = new FastJsonHttpMessageConverter();
    250         fastjson.setSupportedMediaTypes(mediaTypes);
    251         return fastjson;
    252 
    253     }
    254 
    255     /**
    256      * 重写 extendMessageConverters 方法,仅添加自定义 HttpMessageConverter
    257      * 不覆盖默认注册的 HttpMessageConverter
    258      * */
    259     @Override
    260     public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
    261 
    262         converters.add(customMessageConverter());
    263         converters.add(fastJsonHttpMessageConverter());
    264 
    265     }
    266 
    267     // 拦截器 bean
    268     @Bean
    269     public TimerInterceptor timerInterceptor(){
    270 
    271         return new TimerInterceptor();
    272 
    273     }
    274 
    275     // 重写 addInterceptors 注册拦截器
    276     @Override
    277     public void addInterceptors(InterceptorRegistry registry) {
    278 
    279         registry.addInterceptor(timerInterceptor());
    280 
    281     }
    282 
    283 }

      3.index.jsp

     1 <%@ page contentType="text/html;charset=UTF-8" language="java" %>
     2 <html>
     3 <head>
     4     <title>LM Solution</title>
     5 </head>
     6 
     7 <body>
     8 <h3>Spring MVC 仿 Spring Boot</h3>
     9 <a href="/excel"> Excel </a><br>
    10 <a href="/upload">文件上传下载</a><br>
    11 <a href="/ImageValidateCodeLogin">登录--图片验证码</a><br>
    12 <a href="/restfulapi">Rest API</a><br>
    13 <a href="/jaxwsri">Jax-Ws RI</a><br>
    14 <a href="/redis">redis option by jedis</a><br>
    15 <a href="/mybatisPage">MyBatis</a><br>
    16 <a href="/advice/globalHandlerAdvice"> GlobalHandlerAdvice --> GlobalExceptionHandle --> ErrorPage </a><br>
    17 <a href="/messageconverter"> 自定义 HttpMessageConverter </a><br>
    18 <a href="/sse">Server Sent Event</a>
    19 </body>
    20 </html>

      4.upload.jsp

      1 <%@ page contentType="text/html;charset=UTF-8" language="java" %>
      2 
      3 <html>
      4 <head>
      5     <title>File Upload & Download</title>
      6     <script src="/assets/js/jquery-2.1.4.min.js"></script>
      7     <script src="/assets/js/ajaxfileupload.js"></script>
      8 </head>
      9 <body>
     10 <h3>文件上传</h3>
     11 <h3>方式一:采用 fileUpload_multipartFile , file.transferTo 来保存上传的文件</h3>
     12 <form   name="form1"
     13         action="/FileUpload/fileUpload_multipartFile"
     14         method="post"
     15         enctype="multipart/form-data">
     16     <input type="file" name="file_upload">
     17     <input type="submit" value="上传">
     18 </form>
     19 <hr>
     20 <h3>方式二:采用 fileUpload_multipartRequest file.transferTo 来保存上传文件</h3>
     21 <form name="form2"
     22       action="/FileUpload/fileUpload_multipartRequest"
     23       method="post"
     24       enctype="multipart/form-data">
     25     <input type="file" name="file_upload">
     26     <input type="submit" value="上传">
     27 </form>
     28 <hr>
     29 <h3>方式三:采用 CommonsMultipartResolver file.transferTo 来保存上传文件</h3>
     30 <form name="form3"
     31       action="/FileUpload/fileUpload_CommonsMultipartResolver"
     32       method="post"
     33       enctype="multipart/form-data">
     34     <input type="file" name="file_upload">
     35     <input type="submit" value="上传">
     36 </form>
     37 <hr>
     38 <h3>方式四:通过流的方式上传文件</h3>
     39 <form name="form4"
     40       action="/FileUpload/fileUpload_stream"
     41       method="post"
     42       enctype="multipart/form-data">
     43     <input type="file" name="file_upload">
     44     <input type="submit" value="上传">
     45 </form>
     46 <hr>
     47 <h3>方式五:通过ajax插件 ajaxfileupload.js 来异步上传文件</h3>
     48 <h5>注:已上传成功,只是js返回时会报错。</h5>
     49 <form name="form5"
     50       enctype="multipart/form-data">
     51     <input type="file" id="file_AjaxFile" name="file_AjaxFile">
     52     <input type="button" value="上传" onclick="fileUploadAjax()" >
     53     <span id="sp_AjaxFile"></span>
     54     <br>
     55     <%--上传进度:<span id="sp_fileUploadProgress">0%</span>--%>
     56 </form>
     57 <script type="text/javascript">
     58     //
     59     var progressInterval=null;
     60     var i=0;
     61     //
     62     function fileUploadAjax() {
     63         if($("#file_AjaxFile").val().length>0){
     64             // progressInterval=setInterval(getProgress(),500);
     65             $.ajaxFileUpload({
     66                 // 用于文件上传的服务器端请求地址
     67                 url:'/FileUpload/fileUpload_ajax',
     68                 type:'post',
     69                 // 一般设置为false
     70                 secureuri:false,
     71                 // 文件上传空间的id属性  <input type="file" id="file1" name="file" />
     72                 fileElementId:'file_AjaxFile',
     73                 // 返回值类型 一般设置为json
     74                 dataType:'application/json',
     75                 // 服务器成功响应处理函数
     76                 success:function (data) {
     77                     var jsonObject=eval('('+data+')');
     78                     $("#sp_AjaxFile").html("Upload Success ! filePath:"+jsonObject.filePath);
     79                 },
     80                 // 服务器响应失败处理函数
     81                 error:function (data,status,e) {
     82                     alert(e);
     83                 }
     84             });
     85         }else {
     86             alert("请选择文件!");
     87         }
     88     }
     89 </script>
     90 <hr>
     91 <h3>方式六:多文件上传 采用 MultipartFile[] multipartFile 上传文件方法</h3>
     92 <h5>注:三个文件都选择上。</h5>
     93 <form name="form5"
     94       action="/FileUpload/fileUpload_spring_list"
     95       method="post"
     96       enctype="multipart/form-data">
     97     <input type="file" name="file_upload">
     98     <input type="file" name="file_upload">
     99     <input type="file" name="file_upload">
    100     <input type="submit" value="上传多个"/>
    101 </form>
    102 <hr>
    103 <h3>方式七:通过 a 标签的方式进行文件下载</h3>
    104 <a href="/files/download/mst.txt">通过 a 标签下载文件 mst.txt</a>
    105 <hr>
    106 <h3>方式八:通过 Response 文件流的方式下载文件</h3>
    107 <a href="/FileUpload/fileDownload_servlet">通过 文件流 的方式下载文件 mst.txt</a>
    108 </body>
    109 </html>

      5.FileUploadController.java

      1 package lm.solution.web.controller.fileupload;
      2 
      3 import lm.solution.common.file.Files_Utils_DG;
      4 import org.springframework.stereotype.Controller;
      5 import org.springframework.web.bind.annotation.RequestMapping;
      6 import org.springframework.web.bind.annotation.RequestMethod;
      7 import org.springframework.web.bind.annotation.RequestParam;
      8 import org.springframework.web.bind.annotation.ResponseBody;
      9 import org.springframework.web.multipart.MultipartFile;
     10 import org.springframework.web.multipart.MultipartHttpServletRequest;
     11 import org.springframework.web.multipart.commons.CommonsMultipartResolver;
     12 
     13 import javax.servlet.http.HttpServletRequest;
     14 import javax.servlet.http.HttpServletResponse;
     15 import java.util.Iterator;
     16 
     17 
     18 /**
     19  * 使用 MultipartFile 接收上传文件
     20  * */
     21 @Controller
     22 @RequestMapping(value = "/FileUpload/*")
     23 public class FileUploadController {
     24 
     25     /**
     26      * 方式一
     27      * 采用 fileUpload_multipartFile , file.transferTo 来保存上传的文件
     28      * */
     29     @ResponseBody
     30     @RequestMapping(value = "fileUpload_multipartFile")
     31     public String fileUpload_multipartFile(
     32             HttpServletRequest request,
     33             @RequestParam("file_upload") MultipartFile multipartFile){
     34 
     35         // 调用保存文件的帮助类进行保存文件,并返回文件的相对路径
     36         String filePath= Files_Utils_DG.FileUpload_transferTo_spring(request,multipartFile,"/files/upload");
     37 
     38         return "{'TFMark':'true','Msg':'upload success !','filePath':'"+filePath+"'}";
     39 
     40     }
     41 
     42     /**
     43      * 方式二
     44      * 采用 fileUpload_multipartRequest file.transferTo 来保存上传文件
     45      * 参数不写 MultipartFile multipartFile 在request请求里面直接转成multipartRequest,从multipartRequest中获取到文件流
     46      * */
     47     @ResponseBody
     48     @RequestMapping(value = "fileUpload_multipartRequest")
     49     public String fileUpload_multipartRequest(HttpServletRequest request){
     50 
     51         // 将request转成MultipartHttpServletRequest
     52         MultipartHttpServletRequest multipartRequest=(MultipartHttpServletRequest)request;
     53         // 页面控件的文件流,对应页面控件 input file_upload
     54         MultipartFile multipartFile=multipartRequest.getFile("file_upload");
     55         // 调用保存文件的帮助类进行保存文件,并返回文件的相对路径
     56         String filePath=Files_Utils_DG.FileUpload_transferTo_spring(request,multipartFile,"/files/upload");
     57 
     58         return "{'TFMark':'true','Msg':'upload success !','filePath':'"+filePath+"'}";
     59 
     60     }
     61 
     62     /**
     63      * 方式三
     64      * 采用 CommonsMultipartResolver file.transferTo 来保存上传文件
     65      * 自动扫描全部的input表单
     66      * */
     67     @ResponseBody
     68     @RequestMapping(value = "fileUpload_CommonsMultipartResolver")
     69     public String fileUpload_CommonsMultipartResolver(HttpServletRequest request){
     70 
     71         // 将当前上下文初始化给  CommonsMultipartResolver (多部分解析器)
     72         CommonsMultipartResolver multipartResolver=new CommonsMultipartResolver(request.getSession().getServletContext());
     73 
     74         // 检查form中是否有enctype="multipart/form-data"
     75         if(multipartResolver.isMultipart(request)){
     76             // 将request变成多部分request
     77             MultipartHttpServletRequest multipartRequest=(MultipartHttpServletRequest) request;
     78             // 获取multiRequest 中所有的文件名
     79             Iterator iter=multipartRequest.getFileNames();
     80             while (iter.hasNext()){
     81                 // 一次遍历所有文件
     82                 MultipartFile multipartFile=multipartRequest.getFile(iter.next().toString());
     83                 // 调用保存文件的帮助类进行保存文件,并返回文件的相对路径
     84                 String fileName=Files_Utils_DG.FileUpload_transferTo_spring(request,multipartFile,"/files/upload");
     85 
     86                 System.out.println(fileName);
     87             }
     88         }
     89 
     90         return "upload success !";
     91     }
     92 
     93     /**
     94      * 方式四
     95      * 通过流的方式上传文件
     96      * */
     97     @ResponseBody
     98     @RequestMapping("fileUpload_stream")
     99     public String upFile(
    100             HttpServletRequest request,
    101             @RequestParam("file_upload") MultipartFile multipartFile){
    102 
    103         String filePath=Files_Utils_DG.FilesUpload_stream(request,multipartFile,"/files/upload");
    104 
    105         return "{'TFMark':'true','Msg':'upload success !','filePath':'"+filePath+"'}";
    106 
    107     }
    108 
    109     /**
    110      * 方式五
    111      * 采用 fileUpload_ajax , file.transferTo 来保存上传的文件 异步
    112      * */
    113     @ResponseBody
    114     @RequestMapping(
    115             value = "fileUpload_ajax",
    116             method = RequestMethod.POST,
    117             produces = "application/json;charset=UTF-8")
    118     public String fileUpload_ajax(
    119             HttpServletRequest request,
    120             @RequestParam("file_AjaxFile") MultipartFile multipartFile){
    121 
    122         String filePath=Files_Utils_DG.FileUpload_transferTo_spring(request,multipartFile,"/files/upload");
    123 
    124         return "{'TFMark':'true','Msg':'upload success !','filePath':'"+filePath+"'}";
    125 
    126     }
    127 
    128     /**
    129      * 方式六
    130      * 多文件上传
    131      * 采用 MultipartFile[] multipartFile 上传文件方法
    132      * */
    133     @ResponseBody
    134     @RequestMapping(value = "fileUpload_spring_list")
    135     public String fileUpload_spring_list(
    136             HttpServletRequest request,
    137             @RequestParam("file_upload") MultipartFile[] multipartFile){
    138 
    139         // 判断file数组不能为空并且长度大于0
    140         if(multipartFile!=null&& multipartFile.length>0){
    141             // 循环获取file数组中得文件
    142             try{
    143                 for (int i=0;i<multipartFile.length;i++){
    144                     MultipartFile file=multipartFile[i];
    145                     // 保存文件
    146                     String fileName=Files_Utils_DG.FileUpload_transferTo_spring(request,file,"/files/upload");
    147 
    148                     System.out.println(fileName);
    149                 }
    150 
    151                 return "{'TFMark':'true','Msg':'upload success !'}";
    152             }catch (Exception e){
    153                 return "{'TFMark':'false','Msg':'参数传递有误!'}";
    154             }
    155         }
    156 
    157         return "{'TFMark':'false','Msg':'参数传递有误!'}";
    158 
    159     }
    160 
    161     /**
    162      * 方式八
    163      * 文件下载
    164      *
    165      * @param response
    166      * */
    167     @RequestMapping(value = "fileDownload_servlet")
    168     public void fileDownload_servlet(
    169             HttpServletRequest request,
    170             HttpServletResponse response){
    171 
    172         Files_Utils_DG.FilesDownload_stream(request,response,"/files/download/mst.txt");
    173 
    174     }
    175 
    176 }

      6.Files_Utils_DG.java

      1 package lm.solution.common.file;
      2 
      3 import org.springframework.web.multipart.MultipartFile;
      4 import javax.servlet.http.HttpServletRequest;
      5 import javax.servlet.http.HttpServletResponse;
      6 import java.io.*;
      7 import java.text.SimpleDateFormat;
      8 import java.util.Date;
      9 import java.util.UUID;
     10 
     11 public final class Files_Utils_DG {
     12 
     13     /**
     14      * 构造函数私有,以使此类不可构造实例
     15      */
     16     private Files_Utils_DG() {
     17         throw new Error("The class Cannot be instance !");
     18     }
     19 
     20     // 获取绝对路径
     21     public static String getServerPath(
     22             HttpServletRequest request,
     23             String filePath) {
     24 
     25         return request.getSession().getServletContext().getRealPath(filePath);
     26 
     27     }
     28 
     29     // 获取一个以日期命名的文件夹名 ; example:20160912
     30     public static String getDataPath() {
     31         return new SimpleDateFormat("yyyyMMdd").format(new Date());
     32     }
     33 
     34     // 检查文件夹是否存在,不存在新建一个
     35     public static void checkDir(String savePath) {
     36         File dir = new File(savePath);
     37         if (!dir.exists() || !dir.isDirectory()) {
     38             // 不能创建多层目录
     39             //dir.mkdir();
     40             // 创建多层目录
     41             dir.mkdirs();
     42         }
     43     }
     44 
     45     // return an UUID Name parameter (suffix cover '.') example: ".jpg"、".txt"
     46     public static String getUUIDName(String suffix) {
     47         // make new file name
     48         return UUID.randomUUID().toString() + suffix;
     49     }
     50 
     51     // return server absolute path(real path) the style is  “server absolute
     52     // path/DataPath/UUIDName”filePath example "/files/Upload"
     53     public static String getAndSetAbsolutePath(
     54             HttpServletRequest request,
     55             String filePath,
     56             String suffix) {
     57 
     58         // example:F:/qixiao/files/Upload/20160912/
     59         String savePath = getServerPath(request, filePath) + File.separator + getDataPath() + File.separator;
     60         // check if the path has exist if not create it
     61         checkDir(savePath);
     62         return savePath + getUUIDName(suffix);
     63 
     64     }
     65 
     66     // get the relative path of files style is
     67     // “/filePath/DataPath/UUIDName”filePath example "/files/Upload"
     68     public static String getRelativePath(String filePath, String suffix) {
     69         // example:/files/Upload/20160912/
     70         return filePath + File.separator + getDataPath() + File.separator + getUUIDName(suffix);
     71     }
     72 
     73     /**
     74      * spring mvc files Upload method (transferTo method)
     75      * MultipartFile use TransferTo method upload
     76      *
     77      * @param request       HttpServletRequest
     78      * @param multipartFile MultipartFile(spring)
     79      * @param filePath      filePath example "/files/Upload"
     80      * @return
     81      */
     82     public static String FileUpload_transferTo_spring(
     83             HttpServletRequest request,
     84             MultipartFile multipartFile,
     85             String filePath) {
     86 
     87         if (multipartFile != null) {
     88             // get files suffix
     89             String suffix = multipartFile.getOriginalFilename().substring(multipartFile.getOriginalFilename().lastIndexOf("."));
     90             // filePath+fileName the complex file Name
     91             String absolutePath = getAndSetAbsolutePath(request, filePath, suffix);
     92             // return relative Path
     93             String relativePath = getRelativePath(filePath, suffix);
     94 
     95             try {
     96                 // save file
     97                 multipartFile.transferTo(new File(absolutePath));
     98 
     99                 return relativePath;
    100             } catch (IOException ie) {
    101                 ie.printStackTrace();
    102                 return null;
    103             }
    104 
    105         } else {
    106             return null;
    107         }
    108 
    109     }
    110 
    111     /**
    112      * user stream type save files
    113      *
    114      * @param request       HttpServletRequest
    115      * @param multipartFile MultipartFile  support CommonsMultipartFile file
    116      * @param filePath      filePath example "/files/Upload"
    117      * @return
    118      */
    119     public static String FilesUpload_stream(
    120             HttpServletRequest request,
    121             MultipartFile multipartFile,
    122             String filePath) {
    123 
    124         if (multipartFile != null) {
    125             // get files suffix
    126             String suffix = multipartFile.getOriginalFilename().substring(multipartFile.getOriginalFilename().lastIndexOf("."));
    127             // filePath+fileName the complex file Name
    128             String absolutePath = getAndSetAbsolutePath(request, filePath, suffix);
    129             // return relative Path
    130             String relativePath = getRelativePath(filePath, suffix);
    131             try {
    132                 InputStream inputStream = multipartFile.getInputStream();
    133                 FileOutputStream fileOutputStream = new FileOutputStream(absolutePath);
    134                 // create a buffer
    135                 byte[] buffer = new byte[4096];
    136                 long fileSize = multipartFile.getSize();
    137 
    138                 if (fileSize <= buffer.length) {
    139                     buffer = new byte[(int) fileSize];
    140                 }
    141 
    142                 int line = 0;
    143                 while ((line = inputStream.read(buffer)) > 0) {
    144                     fileOutputStream.write(buffer, 0, line);
    145                 }
    146 
    147                 fileOutputStream.close();
    148                 inputStream.close();
    149 
    150                 return relativePath;
    151 
    152             } catch (Exception e) {
    153                 e.printStackTrace();
    154             }
    155         } else {
    156             return null;
    157         }
    158 
    159         return null;
    160     }
    161 
    162     /**
    163      * @param request  HttpServletRequest
    164      * @param response HttpServletResponse
    165      * @param filePath example "/filesOut/Download/mst.txt"
    166      *
    167      * @return
    168      * */
    169     public static void FilesDownload_stream(
    170             HttpServletRequest request,
    171             HttpServletResponse response,
    172             String filePath){
    173 
    174         // get server path (real path)
    175         String realPath=request.getSession().getServletContext().getRealPath(filePath);
    176         File file=new File(realPath);
    177         String filenames=file.getName();
    178         InputStream inputStream;
    179         try{
    180             inputStream=new BufferedInputStream(new FileInputStream(file));
    181             byte[] buffer=new byte[inputStream.available()];
    182             inputStream.read(buffer);
    183             inputStream.close();
    184             response.reset();
    185             // 先去掉文件名称中的空格,然后转换编码格式为utf-8,保证不出现乱码,这个文件名称用于浏览器的下载框中自动显示的文件名
    186             response.addHeader("Content-Disposition","attachment;filename="+new String(filenames.replaceAll(" ","").getBytes("UTF-8"),"iso8859-1"));
    187             response.addHeader("Content-Length",""+file.length());
    188             OutputStream os=new BufferedOutputStream(response.getOutputStream());
    189             response.setContentType("application/octet-stream");
    190             os.write(buffer);
    191             os.flush();
    192             os.close();
    193         }catch (Exception e){
    194             e.printStackTrace();
    195         }
    196 
    197     }
    198 
    199 
    200 
    201 }

                                             蒙

                                        2018-05-16 22:22 周三

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  • 原文地址:https://www.cnblogs.com/Meng-NET/p/9048583.html
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