基于springMVC 3.X 框架的文件上传实现
1. spring使用了apache-commons下得上传组件，因此，我们需要引入两个jar包：
1. commons-fileupload.jar
2. commons-io.jar
3. 在springmvc-servlet.xml配置文件中，增加CommonsMultipartResoler配置：
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:p="http://www.springframework.org/schema/p"
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/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<context:component-scan base-package="cn.bdqn.controller"/>
<mvc:annotation-driven />
<!-- 将静态文件指定到某个特殊的文件夹中统一处理 -->
<mvc:resources mapping="/resources/**" location="/resources/" />
<!-- 对转向页面的路径解析。prefix：前缀， suffix：后缀 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!-- 配置MultipartResolver，用于上传文件，使用spring的CommonsMultipartResolver -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="5000000"/>
<property name="defaultEncoding" value="UTF-8"/>
</bean>
</beans>
| <!-- 处理文件上传配置的其他属性 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" > <property name="defaultEncoding" value="gbk"/> <!-- 默认编码 (ISO-8859-1) --> <property name="maxInMemorySize" value="10240"/> <!-- 最大内存大小 (10240)--> <property name="maxUploadSize" value="-1"/> <!-- 最大文件大小，-1为无限止(-1) --> </bean> |
3. 建立upload.jsp页面，内容如下：
| <%@ page language="java" import="java.util.*" pageEncoding=" utf-8"%> <html> <head> <title>测试springmvc中上传的实现</title> </head> <body> <form action="upload" method="post" enctype="multipart/form-data"> 姓名：<input type="text" name="name" /> 上传资源：<input type="file" name="attach" /> <input type="submit" value="上传"/> </form> </body> </html> |
4. 建立控制器，代码如下：
| package cn.bdqn.controller;
import java.io.File; import java.util.Date; import javax.servlet.http.HttpServletRequest; import org.apache.commons.io.FileUtils; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.multipart.MultipartFile;
@Controller public class UploadController { @RequestMapping(value = "/upload", method = RequestMethod.POST) public String handleUploadData(String name, @RequestParam MultipartFile attach, HttpServletRequest req) { //判断文件是否为空 if(!attach.isEmpty()){ String realPath = req.getSession().getServletContext().getRealPath("/resources/upload"); //获取文件名称 String fileName=attach.getOriginalFilename(); System.out.println(realPath+"/"+fileName); File file = new File(realPath+"/"+fileName);
//获取文件类型 String fileType = fileName.substring(fileName.lastIndexOf(".")); //为避免重名，可以新建文件 File newFile=new File(realPath,new Date().getTime()+fileType); try { //以下三种方式都是上传文件到指定位置，可以按需选用一个 FileUtils.copyInputStreamToFile(attach.getInputStream(), file);//拷贝文件 //FileUtils.writeByteArrayToFile(newFile, attach.getBytes());//将文件重命名存储 //attach.transferTo(newFile);//快速复制文件 } catch (Exception e) { e.printStackTrace(); } System.out.println(attach.getName()+" ======= "+attach.getOriginalFilename()+" ====== "+attach.getContentType()); return "redirect:upload_ok.jsp"; } else { return "redirect:upload_error.jsp"; } } }
|
5. 建立upload_ok.jsp页面
| <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> </head> <body> <h1>上传成功！</h1> </body> </html> |
6. 建立upload_error.jsp页面
| <%@ page language="java" import="java.util.*" pageEncoding=" utf-8"%> <html> <head> </head> <body> <h1>上传失败！</h1> </body> </html> |
1. 发布项目，运行测试：http://localhost:8080/springmvc03/upload.jsp
进入项目发布后的目录，发现文件上传成功：
多文件上传示例代码：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@taglib prefix="sf" uri="http://www.springframework.org/tags/form" %>
<!DOCTYPE html>
<html>
<head>
<title>add</title>
</head>
<body>
<!-- 没有写action，直接提交给/add -->
<sf:form method="post" modelAttribute="user" enctype="multipart/form-data">
UserName:<sf:input path="userName"/><sf:errors path="userName"/><br/>
password:<sf:password path="password"/><sf:errors path="password"/><br/>
position:<sf:input path="position"/><br/>
email:<sf:input path="email"/><sf:errors path="email"/><br/>
Attach1:<input type="file" name="attachs"/><br/>
Attach2:<input type="file" name="attachs"/><br/>
Attach3:<input type="file" name="attachs"/><br/>
Attach4:<input type="file" name="attachs"/><br/>
<input type="submit" value="保存"/>
</sf:form>
</body>
</html>
Controller代码示例：
@RequestMapping(value="/upload",method=RequestMethod.POST)
public String add(@RequestParam("attachs") MultipartFile[] attachs,HttpServletRequest req){
String realPath = req.getSession().getServletContext().getRealPath("/resources/upload");
for(MultipartFile attach:attachs){
if(!attach.isEmpty()){//判断文件是否为空
File file = new File(realPath+"/"+attach.getOriginalFilename());
try {
attach.transferTo(file);
} catch (Exception e) {
e.printStackTrace();
}
}
}
return "redirect:upload_ok.jsp";
}
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