springmvc实现文件上传下载

package com.action;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import com.util.FileOperateUtil;

@Controller
@RequestMapping(value="fileOperate")
public class FileOperateAction {
@RequestMapping(value="upload")
public String upload(HttpServletRequest request){
init(request);
try {
FileOperateUtil.upload(request);
request.setAttribute("msg", "ok");
request.setAttribute("map", getMap());
} catch (Exception e) {
e.printStackTrace();
}
return "redirect:list";
}
@RequestMapping(value="list")
public ModelAndView list(HttpServletRequest request){
init(request);
request.setAttribute("map", getMap());
return new ModelAndView("fileOperate/list");
}
@RequestMapping(value="download")
public void download(HttpServletRequest request, HttpServletResponse response){
init(request);
try {
String downloadfFileName = request.getParameter("filename");
downloadfFileName = new String(downloadfFileName.getBytes("iso-8859-1"),"utf-8");
String fileName = downloadfFileName.substring(downloadfFileName.indexOf("_")+1);
String userAgent = request.getHeader("User-Agent");
byte[] bytes = userAgent.contains("MSIE") ? fileName.getBytes() : fileName.getBytes("UTF-8");
fileName = new String(bytes, "ISO-8859-1");
response.setHeader("Content-disposition", String.format("attachment; filename=\"%s\"", fileName));
FileOperateUtil.download(downloadfFileName, response.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
}
private void init(HttpServletRequest request) {
if(FileOperateUtil.FILEDIR == null){
FileOperateUtil.FILEDIR = request.getSession().getServletContext().getRealPath("/") + "file/";
}
}
private Map<String, String> getMap(){
Map<String, String> map = new HashMap<String, String>();
File[] files = new File(FileOperateUtil.FILEDIR).listFiles();
if(files != null){
for (File file : files) {
if(file.isDirectory()){
File[] files2 = file.listFiles();
if(files2 != null){
for (File file2 : files2) {
String name = file2.getName();
map.put(file2.getParentFile().getName() + "/" + name, name.substring(name.lastIndexOf("_")+1));
}
}
}
}
}
return map;
}
}

package com.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;

import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

public class FileOperateUtil {
public static String FILEDIR = null;
/**
* 上传
* @param request
* @throws IOException
*/
public static void upload(HttpServletRequest request) throws IOException{
MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) request;
Map<String, MultipartFile> fileMap = mRequest.getFileMap();
File file = new File(FILEDIR);
if (!file.exists()) {
file.mkdir();
}
Iterator<Map.Entry<String, MultipartFile>> it = fileMap.entrySet().iterator();
while(it.hasNext()){
Map.Entry<String, MultipartFile> entry = it.next();
MultipartFile mFile = entry.getValue();
if(mFile.getSize() != 0 && !"".equals(mFile.getName())){
write(mFile.getInputStream(), new FileOutputStream(initFilePath(mFile.getOriginalFilename())));
}
}
}
private static String initFilePath(String name) {
String dir = getFileDir(name) + "";
File file = new File(FILEDIR + dir);
if (!file.exists()) {
file.mkdir();
}
Long num = new Date().getTime();
Double d = Math.random()*num;
return (file.getPath() + "/" + num + d.longValue() + "_" + name).replaceAll(" ", "-");
}
private static int getFileDir(String name) {
return name.hashCode() & 0xf;
}
public static void download(String downloadfFileName, ServletOutputStream out) {
try {
FileInputStream in = new FileInputStream(new File(FILEDIR + "/" + downloadfFileName));
write(in, out);
} catch (FileNotFoundException e) {
try {
FileInputStream in = new FileInputStream(new File(FILEDIR + "/"
+ new String(downloadfFileName.getBytes("iso-8859-1"),"utf-8")));
write(in, out);
} catch (IOException e1) {
e1.printStackTrace();
}
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 写入数据
* @param in
* @param out
* @throws IOException
*/
public static void write(InputStream in, OutputStream out) throws IOException{
try{
byte[] buffer = new byte[1024];
int bytesRead = -1;
while ((bytesRead = in.read(buffer)) != -1) {
out.write(buffer, 0, bytesRead);
}
out.flush();
} finally {
try {
in.close();
}
catch (IOException ex) {
}
try {
out.close();
}
catch (IOException ex) {
}
}
}
}

1. springmvc-context.xml

<?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:p="http://www.springframework.org/schema/p"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
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">
<context:component-scan base-package="com.action"/>
<mvc:annotation-driven/>
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/"/>
<property name="suffix" value=".jsp" />
</bean>
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" p:defaultEncoding="UTF-8" />
</beans>

2. list.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" contentType="text/html; charset=UTF-8"  %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+ request.getContextPath()+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>list</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<style type="text/css">
a:link {
text-decoration: none;
}
a:visited {
text-decoration: none;
}
a:hover {
color: #999999;
text-decoration: underline;
}
</style>
</head>
<body>
<br/>
<c:forEach items="${map}" var="v">
<a href="<%=basePath%>fileOperate/download?filename=${v.key}">${v.value}</a><br/>
</c:forEach>
<br/><a href="<%=basePath%>fileOperate/upload.jsp">上传文件</a>
</body>
</html>

3. upload.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>upload</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<style type="text/css">
.input {
width: 80px;
height: 20px;
line-height: 20px;
background: #0088ff;
text-align: center;
display: inline-block;
overflow: hidden;
position: relative;
text-decoration: none;
top: 5px;
}

.input:hover {
background: #ff8800;
}

.file {
opacity: 0;
filter: alpha(opacity =     0);
font-size: 50px;
position: absolute;
top: 0;
right: 0;
}

a:link {
text-decoration: none;
}
a:visited {
text-decoration: none;
}
a:hover {
color: #999999;
text-decoration: underline;
}
</style>
</head>
<body>
<form action="<%=basePath %>fileOperate/upload"
enctype="multipart/form-data" method="post">
<div>
<input type="text" readonly="readonly" /> <a
href="javascript:void(0);" class="input"> 浏览 <input type="file"
class="file" name="filename1"> </a>
</div>
<div>
<input type="text" readonly="readonly" /> <a
href="javascript:void(0);" class="input"> 浏览 <input type="file"
class="file" name="filename2"> </a>
</div>
<div>
<input type="text" readonly="readonly" /> <a
href="javascript:void(0);" class="input"> 浏览 <input type="file"
class="file" name="filename3"> </a>
</div>
<input type="submit" value="上传">
</form>
<br />
<a href="<%=basePath %>fileOperate/list">下载文件</a>
<script type="text/javascript">
var nodes = document.getElementsByTagName("input");
for ( var i = 0; i < nodes.length; i++) {
if("file" == nodes[i].type){
nodes[i].onchange = function(){
var textObj = this.parentNode.parentNode.getElementsByTagName("input")[0];
var textvalue = this.value;
textvalue = textvalue.substring(textvalue.lastIndexOf("\\")+1, textvalue.length);
textObj.value = textvalue;
};
}
}
</script>
</body>
</html>

4. web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc-context.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

5. index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>index</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<style type="text/css">
a:link {
text-decoration: none;
}
a:visited {
text-decoration: none;
}
a:hover {
color: #999999;
text-decoration: underline;
}
</style>
</head>
<body>
This is my JSP page. <br>
<br/><a href="<%=basePath%>fileOperate/upload.jsp">上传文件</a>
</body>
</html>