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  • spring实现文件上传

    spring—文件上传

    文件上传的回顾

    导入文件上传的jar包

    <?xml version="1.0" encoding="UTF-8"?>
    
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
    
      <groupId>cn.itcast</groupId>
      <artifactId>springmvc_day02_02_fileupload</artifactId>
      <version>1.0-SNAPSHOT</version>
      <packaging>war</packaging>
    
      <name>springmvc_day02_02_fileupload Maven Webapp</name>
      <!-- FIXME change it to the project's website -->
      <url>http://www.example.com</url>
    
      <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <spring.version>5.0.2.RELEASE</spring.version>
      </properties>
    
      <dependencies>
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-context</artifactId>
          <version>${spring.version}</version>
        </dependency>
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-web</artifactId>
          <version>${spring.version}</version>
        </dependency>
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-webmvc</artifactId>
          <version>${spring.version}</version>
        </dependency>
    
        <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>servlet-api</artifactId>
          <version>2.5</version>
          <scope>provided</scope>
        </dependency>
    
        <dependency>
          <groupId>javax.servlet.jsp</groupId>
          <artifactId>jsp-api</artifactId>
          <version>2.0</version>
          <scope>provided</scope>
        </dependency>
    <!--文件上传的jar包   commons- -->
        <dependency>
          <groupId>commons-fileupload</groupId>
          <artifactId>commons-fileupload</artifactId>
          <version>1.3.1</version>
        </dependency>
        <dependency>
          <groupId>commons-io</groupId>
          <artifactId>commons-io</artifactId>
          <version>2.4</version>
        </dependency>
    
        <dependency>
          <groupId>com.sun.jersey</groupId>
          <artifactId>jersey-core</artifactId>
          <version>1.18.1</version>
        </dependency>
        <dependency>
          <groupId>com.sun.jersey</groupId>
          <artifactId>jersey-client</artifactId>
          <version>1.18.1</version>
        </dependency>
    
      </dependencies>
    
      <build>
        <finalName>springmvc_day02_02_fileupload</finalName>
        <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
          <plugins>
            <plugin>
              <artifactId>maven-clean-plugin</artifactId>
              <version>3.0.0</version>
            </plugin>
            <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
            <plugin>
              <artifactId>maven-resources-plugin</artifactId>
              <version>3.0.2</version>
            </plugin>
            <plugin>
              <artifactId>maven-compiler-plugin</artifactId>
              <version>3.7.0</version>
            </plugin>
            <plugin>
              <artifactId>maven-surefire-plugin</artifactId>
              <version>2.20.1</version>
            </plugin>
            <plugin>
              <artifactId>maven-war-plugin</artifactId>
              <version>3.2.0</version>
            </plugin>
            <plugin>
              <artifactId>maven-install-plugin</artifactId>
              <version>2.5.2</version>
            </plugin>
            <plugin>
              <artifactId>maven-deploy-plugin</artifactId>
              <version>2.8.2</version>
            </plugin>
          </plugins>
        </pluginManagement>
      </build>
    </project>
    

    编写springMVC类

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:mvc="http://www.springframework.org/schema/mvc"
           xmlns:context="http://www.springframework.org/schema/context"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="
            http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/mvc
            http://www.springframework.org/schema/mvc/spring-mvc.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context.xsd">
    
        <!-- 开启注解扫描 -->
        <context:component-scan base-package="cn.itcast"/>
    
        <!-- 视图解析器对象 -->
        <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/WEB-INF/pages/"/>
            <property name="suffix" value=".jsp"/>
        </bean>
    
        <!--前端控制器,哪些静态资源不拦截-->
        <mvc:resources location="/css/" mapping="/css/**"/>
        <mvc:resources location="/images/" mapping="/images/**"/>
        <mvc:resources location="/js/" mapping="/js/**"/>
    
        <!--配置文件解析器对象-->
        <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
            <property name="maxUploadSize" value="10485760" />
        </bean>
    
        <!-- 开启SpringMVC框架注解的支持 -->
        <mvc:annotation-driven />
    
    </beans>
    

    编写文件上传的JSP页面

    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
    
        <h3>传统文件上传</h3>
    
        <form action="/user/fileupload1" method="post" enctype="multipart/form-data">
            选择文件:<input type="file" name="upload" /><br/>
            <input type="submit" value="上传" />
        </form>
        </body>
    </html>
    

    编写文件上传的Controller控制器

    /**
     * 文件上传
     * @return
     */
    @RequestMapping("/fileupload1")
    public String fileuoload1(HttpServletRequest request) throws Exception {
        System.out.println("文件上传...");
    
        // 使用fileupload组件完成文件上传
        // 上传的位置
        String path = request.getSession().getServletContext().getRealPath("/uploads/");
        // 判断,该路径是否存在
        File file = new File(path);
        if(!file.exists()){
            // 创建该文件夹
            file.mkdirs();
        }
    
        // 解析request对象,获取上传文件项
        DiskFileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload upload = new ServletFileUpload(factory);
        // 解析request
        List<FileItem> items = upload.parseRequest(request);
        // 遍历
        for(FileItem item:items){
            // 进行判断,当前item对象是否是上传文件项
            if(item.isFormField()){
                // 说明普通表单向
            }else{
                // 说明上传文件项
                // 获取上传文件的名称
                String filename = item.getName();
                // 把文件的名称设置唯一值,uuid
                String uuid = UUID.randomUUID().toString().replace("-", "");
                filename = uuid+"_"+filename;
                // 完成文件上传
                item.write(new File(path,filename));
                // 删除临时文件
                item.delete();
            }
        }
    
        return "success";
    }
    

    编写文件上传的JSP页面

    <%@ page contentType="text/html;charset=UTF-8" language="java" %>

    Title

    传统文件上传

    选择文件:

    SpringMVC传统方式文件上传

    SpringMVC框架提供了MultipartFile对象,该对象表示上传的文件,要求变量名称必须和表单file标签的 name属性名称相同

    与传统方式相比,解析文件更简单,

    编写文件上传的Controller控制器

    /**
     * SpringMVC文件上传
     * @return
     */
    @RequestMapping("/fileupload2")
    public String fileuoload2(HttpServletRequest request, MultipartFile upload) throws Exception {
        System.out.println("springmvc文件上传...");
    
        // 使用fileupload组件完成文件上传
        // 上传的位置
        String path = request.getSession().getServletContext().getRealPath("/uploads/");
        // 判断,该路径是否存在
        File file = new File(path);
        if(!file.exists()){
            // 创建该文件夹
            file.mkdirs();
        }
    
        // 说明上传文件项
        // 获取上传文件的名称
        String filename = upload.getOriginalFilename();
        // 把文件的名称设置唯一值,uuid
        String uuid = UUID.randomUUID().toString().replace("-", "");
        filename = uuid+"_"+filename;
        // 完成文件上传
        upload.transferTo(new File(path,filename));
    
        return "success";
    }
    

    配置文件解析器对象

    在springMVC里面配置

    <!--配置文件解析器对象-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="10485760" />
    </bean>
    

    编写文件上传的JSP页面

    选择文件:

    SpringMVC跨服务器方式文件上

    搭建图片服务器

    ​ 根据文档配置tomcat9的服务器,现在是2个服务器

    ​ 导入资料中day02_springmvc5_02image项目,作为图片服务器使用

    导入开发需要的jar包

    <dependency>
      <groupId>com.sun.jersey</groupId>
      <artifactId>jersey-core</artifactId>
      <version>1.18.1</version>
    </dependency>
    <dependency>
      <groupId>com.sun.jersey</groupId>
      <artifactId>jersey-client</artifactId>
      <version>1.18.1</version>
    </dependency>
    

    编写文件上传的JSP页面

    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
        <h3>跨服务器文件上传</h3>
    
        <form action="/user/fileupload3" method="post" enctype="multipart/form-data">
            选择文件:<input type="file" name="upload" /><br/>
            <input type="submit" value="上传" />
        </form>
    
    </body>
    </html>
    

    . 编写控制器

    package cn.itcast.controller;
    
    import com.sun.jersey.api.client.Client;
    import com.sun.jersey.api.client.WebResource;
    import org.apache.commons.fileupload.FileItem;
    import org.apache.commons.fileupload.disk.DiskFileItemFactory;
    import org.apache.commons.fileupload.servlet.ServletFileUpload;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.multipart.MultipartFile;
    
    import javax.servlet.http.HttpServletRequest;
    import java.io.File;
    import java.util.List;
    import java.util.UUID;
    
    @Controller
    @RequestMapping("/user")
    public class UserController {
    
        /**
         * 跨服务器文件上传
         * @return
         */
        @RequestMapping("/fileupload3")
        public String fileuoload3(MultipartFile upload) throws Exception {
            System.out.println("跨服务器文件上传...");
    
            // 定义上传文件服务器路径
            String path = "http://localhost:9090/uploads/";
    
            // 说明上传文件项
            // 获取上传文件的名称
            String filename = upload.getOriginalFilename();
            // 把文件的名称设置唯一值,uuid
            String uuid = UUID.randomUUID().toString().replace("-", "");
            filename = uuid+"_"+filename;
    
            // 创建客户端的对象
            Client client = Client.create();
    
            // 和图片服务器进行连接
            WebResource webResource = client.resource(path + filename);
    
            // 上传文件
            webResource.put(upload.getBytes());
    
            return "success";
        }
    
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  • 原文地址:https://www.cnblogs.com/Lilwhat/p/12604099.html
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