springmvc提交表单传输文件

首先我的html表单页面是这样的

<!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">
<link href="../index2Files/css/Home.css" rel="stylesheet" type="text/css">
<title>addDocument</title>
</head>
<body>
	<div style='overflow:hidden;margin-left:10px;padding-top:10px'>
	<form action="/exam/upload"  method="post" enctype="multipart/form-data"  id="uploadFile" target="test">
		<input id="filepath" type="text" length="30" class="input-bg" readonly="readonly" style="font-size:20px;color:#00d2ff"/>
		<input type="file"  name="file" class="file1" id="file" style="display:none;" size="28" onchange="getuploadFile()" />
		<input id="scan" type="button" class="zhixing-bt" value="浏览" onclick="file1()"/>
		<input id="import" type="submit" class="zhixing-bt" value="导入"/>
	</form>
	</div>
	<iframe name="test"></iframe>
	<script type="text/javascript" src="../js/jquery.js"></script>
	<script type="text/javascript" src="../js/jquery-1.11.0.min.js"></script>
	<script type="text/javascript" src="../js/jquery.form.js"></script>
	
</body>
</html>

里面的js函数可以先不用管它，不涉及到文件提交然后是后台接收

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

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

import main.java.bean.ExamQuestion;
import main.java.service.ExamService;
import main.java.util.BeanUtil;
import main.java.util.Util;
import net.sf.json.JSONObject;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
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.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

@Controller
@RequestMapping(value="/exam")
public class ExamController {
	private ExamService examService = (ExamService) BeanUtil.getBeanByName("examService");
	
	@RequestMapping(value="/upload" , method = RequestMethod.POST)
	@ResponseBody
	public JSONObject upload(@RequestParam("file")MultipartFile[] files , HttpServletRequest request, HttpServletResponse response){
		File orgFile = null ;
		 for(MultipartFile myfile : files){  
	            if(myfile.isEmpty()){  
	                System.out.println("文件未上传");  
	            }else{  
	                System.out.println("文件长度: " + myfile.getSize());  
	                System.out.println("文件类型: " + myfile.getContentType());  
	                System.out.println("文件名称: " + myfile.getName());  
	                System.out.println("文件原名: " + myfile.getOriginalFilename());  
	                System.out.println("========================================");  
	                //如果用的是Tomcat服务器，则文件会上传到\\%TOMCAT_HOME%\\webapps\\YourWebProject\\WEB-INF\\upload\\文件夹中  
	                String realPath = request.getSession().getServletContext().getRealPath("/WEB-INF/upload");  
	                //这里不必处理IO流关闭的问题，因为FileUtils.copyInputStreamToFile()方法内部会自动把用到的IO流关掉，我是看它的源码才知道的  
	                	
	                InputStream in = null ;
	                FileOutputStream out = null ;
	                try{
	                in = myfile.getInputStream();
	                byte[] buffer = new byte[1024] ;
	                int length = 0 ; 
	                File filedir = new File(realPath);
	                if(!filedir.exists()){
	                	filedir.mkdirs();
	                }
	                orgFile = new File(realPath+"\\"+myfile.getOriginalFilename()) ;
	                out = new FileOutputStream(orgFile);
	                
	                while((length = in.read(buffer)) != -1){
	                	out.write(buffer, 0, length);
	                }
	                out.flush();
	                }
	                catch(Exception e ){
	                	e.printStackTrace();
	                }
	                finally{
	                	if(in!= null ){
	                		 try {
								in.close() ;
							} catch (IOException e) {
								// TODO Auto-generated catch block
								e.printStackTrace();
							}
	                	}
	                	if(out!= null ){
	                		try {
								out.close();
							} catch (IOException e) {
								// TODO Auto-generated catch block
								e.printStackTrace();
							}
	                	}
	                
	                }
	            }  
	        }  
		
		JSONObject result = new JSONObject();
		result.put("success", "false") ;
		List<ExamQuestion> questionList = new ArrayList<ExamQuestion>();
		if( orgFile != null && orgFile.exists()){}
		if(questionList != null && questionList.size() > 0 ){
			examService.addQuestionBatch(questionList);
			result.put("success", "true") ;
		}
		return result ;
	}
}

在这基础上，springmvc的配置需要添加如下信息

</bean>
  <!-- SpringMVC上传文件时，需要配置MultipartResolver处理器 -->  
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">  
        <property name="defaultEncoding" value="UTF-8"/>  
        <!-- 指定所上传文件的总大小不能超过200KB。注意maxUploadSize属性的限制不是针对单个文件，而是所有文件的容量之和 -->  
        <property name="maxUploadSize" value="2000000"/>  
    </bean>  
      
    <!-- SpringMVC在超出上传文件限制时，会抛出org.springframework.web.multipart.MaxUploadSizeExceededException -->  
    <!-- 该异常是SpringMVC在检查上传的文件信息时抛出来的，而且此时还没有进入到Controller方法中 -->  
    <bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">  
        <property name="exceptionMappings">  
            <props>  
                <!-- 遇到MaxUploadSizeExceededException异常时，自动跳转到/WEB-INF/jsp/error_fileupload.jsp页面 -->  
                <prop key="org.springframework.web.multipart.MaxUploadSizeExceededException">error_fileupload</prop>  
            </props>  
        </property>  
    </bean>

springmvc提交表单传输文件

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