Spring3 MVC 学习笔记（三）文件上传

ywChen

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Spring

MVC Spring Bean Web JSP

spring支持在网络应用程序处理文件上传，提供拔插的org.springframework.web.multipart.MultipartResolver对象　。

在写上传文件的前提下需提供两个jar包：

1.添加上传拦截，可指定上传的大小

<!-- 上传拦截，如最大上传值及最小上传值 -->
	<bean id="multipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<!-- one of the properties available; the maximum file size in bytes -->
		<property name="maxUploadSize" value="100000" />
	</bean>

2.添加java后台处理的API

@RequestMapping(value = "/form", method = RequestMethod.POST)
public String handleFormUpload(@RequestParam("name") String name,
@RequestParam("file") MultipartFile file) {
if (!file.isEmpty()) {
byte[] bytes = file.getBytes();
// 去理上传写文件代码

}

具体文件

spring_mvc.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:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="
		http://www.springframework.org/schema/beans
		http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
		http://www.springframework.org/schema/context
		http://www.springframework.org/schema/context/spring-context-3.0.xsd">
	<!-- 注解资源扫描包路径 -->
	<context:component-scan base-package="org.spring.mvc" />
	<bean
		class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />

	<bean
		class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />

	<!--  对模型视图名称的解析，即在模型视图名称添加前后缀,在requestmapping输入的地址后自动调用该类进行视图解析-->
	<bean id="viewResolver"
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="viewClass"
			value="org.springframework.web.servlet.view.JstlView" />
		<property name="prefix" value="/" /><!-- 跳转页面的前缀路径 如 /web-inf/user/ -->
		<property name="suffix" value=".jsp"></property><!-- 跳转页面后缀 如 helloWorld.jsp-->
	</bean>

	<!-- 上传拦截，如最大上传值及最小上传值 -->
	<bean id="multipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<!-- one of the properties available; the maximum file size in bytes -->
		<property name="maxUploadSize" value="100000" />
	</bean>

</beans>

FileUploadController.java文件

package org.spring.mvc.upload;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.spring.mvc.HelloWorldController;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

/**
 * 上传文件
 * @author chenyw
 *
 */
@Controller
@RequestMapping(value = "/toFileUpload")
public class FileUploadController {
	private Logger logger = LoggerFactory.getLogger(HelloWorldController.class);

	/**
	 * 单文件上传
	 * @param name @RequestParam 取得name字段的值
	 * @param file 文件
	 * @return
	 * @throws IOException
	 */
	@RequestMapping(value = "/oneFileUpload", method = RequestMethod.POST)
	public String handleFormUpload(@RequestParam("name")
	String name, @RequestParam("file")
	MultipartFile file) throws IOException {
		
		logger.info("name："+name);
		logger.info("上传文件："+file.getOriginalFilename());
		if (!file.isEmpty()) {
			 this.copyFile(file.getInputStream(), file.getOriginalFilename());
			
		} 
		return "fileUpload/success";
	}

	  /**
	   * 多文件上传
	   * @param request
	   * @param name
	   * @return
	   * @throws Exception
	   */
	  @RequestMapping(value = "/multipartFileUpload",method = RequestMethod.POST)
	     public String upload2(
	        MultipartHttpServletRequest request ,
	        @RequestParam("name") String name    // 页面上的控件值
	        ) throws Exception {
	      List<MultipartFile> files = request.getFiles("file");
	      for( int i=0; i<files.size() ;i++){
	           if(! files.get(i).isEmpty()) {
	        	   logger.info("上传文件："+files.get(i).getOriginalFilename());
	              this.copyFile(files.get(i).getInputStream(), files.get(i).getOriginalFilename());
	           }
	      }
	      logger.info("success");
	      return "fileUpload/success";
	     }
	
	  /**
	   * 写文件到本地
	   * @param in
	   * @param fileName
	   * @throws IOException
	   */
	  private void copyFile(InputStream in,String fileName) throws IOException{
		  FileOutputStream fs = new FileOutputStream("d:/upload/"
					+ fileName);
			byte[] buffer = new byte[1024 * 1024];
			int bytesum = 0;
			int byteread = 0;
			while ((byteread = in.read(buffer)) != -1) {
				bytesum += byteread;
				fs.write(buffer, 0, byteread);
				fs.flush();
			}
			fs.close();
			in.close();
	  }
	 
	
}

单文件上传页面oneFileUpload.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'oneFileUpload.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
    This is my onefileUpload page. <br>
    <form method="POST" action="toFileUpload/oneFileUpload" enctype="multipart/form-data">
		<input type="text" name="name"/>
		<input type="file" name="file"/>
		<input type="submit"/>
	</form>
  </body>
</html>

多文件上传页面multipartFileUpload.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'multipartFileUpload.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
    This is multipartFileUpload page. <br>
    <form method="POST" action="toFileUpload/multipartFileUpload" enctype="multipart/form-data">
		<input type="text" name="name"/><br>
		<input type="file" name="file"/><br>
		<input type="file" name="file"/><br>
		<input type="submit"/><br>
	</form>
  </body>
</html>

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