springmvc上传和下载功能 写在一个简单的示例在线基准码
1、导入的必要性jar包：ant.jar、commons-fileupload.jar、connom-io.jar。
当然spring jar呵呵必备包 我这里用的是spring+springmvc+hibernate 能够到官网上直接下载springmvcjar就可以
2、springmvc.xml配置
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
<!-- 扫描包 -->
<context:component-scan base-package="com.ai.customer" />
<!-- 启动注解 -->
<mvc:annotation-driven />
<!-- 文件上传 -->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 设置上传文件的最大尺寸为10MB -->
<property name="maxUploadSize">
<value>10000000</value>
</property>
</bean>
<!-- 静态文件訪问 -->
<mvc:default-servlet-handler/>
<!-- 对模型视图名称的解析，即在模型视图名称加入前后缀 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
<property name="prefix" value="/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>3、web.xml配置
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:config/spring/spring-*.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<filter>
<filter-name>codeUTF-8</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>codeUTF-8</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>4、程序代码块
package com.ai.customer.controller;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileUpload;
import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class FileUploadController {
/*
* SpringMVC中的文件上传
* @第一步：因为SpringMVC使用的是commons-fileupload实现，故将其组件引入项目中
* @这里用到的是commons-fileupload-1.2.1.jar和commons-io-1.3.2.jar
* @第二步：spring-mvx中配置MultipartResolver处理器。可在此加入对上传文件的属性限制
* <bean id="multipartResolver"
* class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
* <!-- 设置上传文件的最大尺寸为10MB -->
* <property name="maxUploadSize">
* <value>10000000</value>
* </property>
* </bean>
* 第三步：在Controller的方法中加入MultipartFile參数。
该參数用于接收表单中file组件的内容
*第四步：编写前台表单。注意enctype="multipart/form-data"以及<input type="file" name="****"/>
* 假设是单个文件 直接使用MultipartFile 就可以
*/
/**********************上传代码**************************/
@RequestMapping("/upload.do")
public ModelAndView upload(String name,
//上传多个文件
@RequestParam("file") MultipartFile[] file,
HttpServletRequest request) throws IllegalStateException,
IOException {
//获取文件 存储位置
String realPath = request.getSession().getServletContext()
.getRealPath("/uploadFile");
File pathFile = new File(realPath);
if (!pathFile.exists()) {
//文件夹不存 创建文件
pathFile.mkdirs();
}
for (MultipartFile f : file) {
System.out.println("文件类型："+f.getContentType());
System.out.println("文件名："+f.getOriginalFilename());
System.out.println("文件大小:"+f.getSize());
System.out.println(".................................................");
//将文件copy上传到server
f.transferTo(new File(realPath + "/" + f.getOriginalFilename()));
//FileUtils.copy
}
//获取modelandview对象
ModelAndView view = new ModelAndView();
view.setViewName("redirect:index.jsp");
return view;
}
/********下载代码*************/
@RequestMapping(value = "download.do")
public ModelAndView download(HttpServletRequest request,
HttpServletResponse response) throws Exception {
// String storeName = "Spring3.xAPI_zh.chm";
String storeName="房地.txt";
String contentType = "application/octet-stream";
FileUploadController.download(request, response, storeName, contentType);
return null;
}
//文件下载 主要方法
public static void download(HttpServletRequest request,
HttpServletResponse response, String storeName, String contentType
) throws Exception {
request.setCharacterEncoding("UTF-8");
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
//获取项目根文件夹
String ctxPath = request.getSession().getServletContext()
.getRealPath("");
//获取下载文件露肩
String downLoadPath = ctxPath+"/uploadFile/"+ storeName;
//获取文件的长度
long fileLength = new File(downLoadPath).length();
//设置文件输出类型
response.setContentType("application/octet-stream");
response.setHeader("Content-disposition", "attachment; filename="
+ new String(storeName.getBytes("utf-8"), "ISO8859-1"));
//设置输出长度
response.setHeader("Content-Length", String.valueOf(fileLength));
//获取输入流
bis = new BufferedInputStream(new FileInputStream(downLoadPath));
//输出流
bos = new BufferedOutputStream(response.getOutputStream());
byte[] buff = new byte[2048];
int bytesRead;
while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
bos.write(buff, 0, bytesRead);
}
//关闭流
bis.close();
bos.close();
}
}
5、jsp页面代码 注意：设置表单中form表单的属性为：enctype="multipart/form-data"
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="upload.do" method="post" enctype="multipart/form-data">
<input type="text" name="name" />
<br>
<input type="file" name="file">
<br>
<input type="file" name="file" />
<input type="submit" value="提交">
</form>
</body>
</html>