SpringMVC技术上传文件的源代码

<?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:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
<!-- 将Controller或DAO等组件扫描到Spring容器 -->
<context:component-scan
base-package="org.tarena"/>
<!-- 定义@RequestMapping的支持 -->
<mvc:annotation-driven/>
<!-- 定义ViewResover -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix"
value="/WEB-INF/jsp/">
</property>
<property name="suffix" value=".jsp">
</property>
</bean>
<!-- 定义上传解析器,自动调用commons-fileupload.jar -->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize"
value="10240">
</property>
<property name="resolveLazily"
value="true">
</property>
</bean>

</beans>

package org.tarena.controller;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MaxUploadSizeExceededException;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class UploadController {

@RequestMapping("/toUpload")
public String toUpload(){
//进入upload.jsp
return "upload";
}

@RequestMapping("/upload")
public String upload(
@RequestParam("file") MultipartFile file,
HttpServletRequest req,Model model) throws Exception{
//TODO 将file保存到upload文件夹位置
System.out.println("上传文件:"+file);
//-----检查上传文件类型-------
//1.file.getOriginalFilename(),截取扩展名
//2.判断是否允许该类型,不允许,跳转到upload.jsp,
//带一个error消息出去,终止后面执行
//-------------------
String path = req.getSession()
.getServletContext()
.getRealPath("upload");
String filePath = path+File.separatorChar
+file.getOriginalFilename();
System.out.println(filePath);
//      try{
//写文件操作
InputStream fis = file.getInputStream();
FileOutputStream fos =
new FileOutputStream(
new File(filePath));
byte[] bbs = new byte[1024];
int len = -1;
while(-1 != (len=fis.read(bbs))){
fos.write(bbs,0,len);
}
fos.close();
fis.close();
//将上传的文件放入模型,在ok显示
model.addAttribute("fname",
file.getOriginalFilename());
return "ok";//进入ok.jsp
//      }catch(Exception ex){
//          ex.printStackTrace();
//          return "error";//进入错误error.jsp
//      }
}

@ExceptionHandler//处理Controller方法抛出的异常
public ModelAndView doException(
Exception ex){
Map<String, Object> map =
new HashMap<String, Object>();
if(ex instanceof MaxUploadSizeExceededException){
long maxSize =
((MaxUploadSizeExceededException)ex)
.getMaxUploadSize();
map.put("error",
"上传的文件太大,不能超过"+maxSize/1024+"K");
}else{
map.put("error", "上传失败");
}
return new ModelAndView("upload",map);
}

}

<?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:applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.from</url-pattern>
</servlet-mapping>

<filter>
<filter-name>encodingfilter</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>
</filter>
<filter-mapping>
<filter-name>encodingfilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

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

<%@ page import="java.util.*"
pageEncoding="UTF-8"
contentType="text/html;charset=UTF-8"%>
<html>
<head>
</head>
<body>
上传成功!
<a href="upload/${fname }">${fname }</a>
</body>
</html>

<%@ page import="java.util.*"
pageEncoding="UTF-8"
contentType="text/html;charset=UTF-8"%>
<html>
<head>
</head>
<body>
<font color="red">${error }</font>
<form action="upload.from" method="post"
enctype="multipart/form-data">
<input type="file" name="file">
<input type="submit" value="上传">
</form>
</body>
</html>