問題描述：
1.在Controller中解析HttpServletRequest request 的時候報空指針異常：fileList = upload.parseRequest(request); 問題；
如圖：
原因：
在spring配置中配置了：<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>
只要註釋起來就可以了...
Controller類代碼如下：
package com.partner.core.controller;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.util.Streams;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartHttpServletRequest;
@Controller
public class FileUploadController {
protected final transient Log log = LogFactory.getLog(FileUploadController.class);
@RequestMapping(value ="customer/fileupload.do")
public String fileUpload(HttpServletRequest request, HttpServletResponse response){
try {
request.setCharacterEncoding("utf-8");
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
}
response.setContentType("text/html; charset=utf-8");
//文件存放的目錄
File tempDirPath =new File(request.getSession().getServletContext().getRealPath("/")+File.separator+"uploads");
if(!tempDirPath.exists()){
tempDirPath.mkdirs();
}
//創建磁盤文件工廠
DiskFileItemFactory fac = new DiskFileItemFactory();
//創建servlet文件上傳組件
ServletFileUpload upload = new ServletFileUpload(fac);
upload.setHeaderEncoding("UTF-8");
//文件列表
List fileList = null;
//解析request從而得到前臺傳過來的文件
try {
fileList = upload.parseRequest(request);
} catch (FileUploadException ex) {
log.error("Parse HttpServletRequest error",ex);
return null;
}
//保存後的文件名
String imageName = null;
//便利從前臺得到的文件列表
Iterator<FileItem> it = fileList.iterator();
while(it.hasNext()){
FileItem item = it.next();
//如果不是普通表單域，當做文件域來處理
if(!item.isFormField()){
imageName = new Date().getTime()+item.getName();
BufferedOutputStream out = null;
BufferedInputStream in = null;
try {
in = new BufferedInputStream(item.getInputStream());
out = new BufferedOutputStream(
new FileOutputStream(new File(tempDirPath+File.separator+imageName)));
Streams.copy(in, out, true);
} catch (FileNotFoundException e) {
log.error("FileNotFoundException",e);
} catch (IOException e) {
log.error("IOException",e);
}finally{
if(in != null){
try {
in.close();
} catch (IOException e) {
log.error("inputStream close error",e);
}
}
if(out != null){
try {
out.close();
} catch (IOException e) {
log.error("outputSteam close error", e);
}
}
}
}
}
PrintWriter out = null;
try {
out = response.getWriter();
} catch (IOException e) {
log.error("IOException", e);
}
//這個地方不能少，否則前臺得不到上傳的結果
out.write(imageName);
out.close();
return null;
}
}
JSP代碼：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<html>
<head>
<title>uploadify-實例</title>
<link href="<%=path %>/uploadify/uploadify.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="<%=path%>/js/jquery.js" charset="utf-8"></script>
<script type="text/javascript" src="<%=path %>/uploadify/jquery.uploadify.min.js" charset="utf-8"></script>
<script type="text/javascript">
$(function() {
$("#fileids").attr("value","");
$('#uploadify').uploadify({
'queueID' : 'fileQueue',
'auto' : false,
'method' : 'POST',
'swf' : '../uploadify/uploadify.swf',
'uploader' : '<%=path%>/customer/fileupload.do',
'onUploadSuccess' : function(file, data, response) {
var content = "";
content += "<span>"+file.name+"</span><br/>";
$("#fileNames").append(content);
var ids = "";
ids = $("#fileids").val();
$("#fileids").attr("value",ids+data+",");
}
});
});
</script>
<style type="text/css">
.inputcss
{
color:#333333;
font-family: "Tahoma";
font-size: 12px;
border:solid 1px #CCCCCC;
}
.buttoncss
{
color:#333333;
font-family: "Tahoma";
font-size: 12px;
background-color:#FFFFFF;
border:solid 1px #CCCCCC;
}
</style>
</head>
<body>
<div id="fileNames">
</div>
<table style="width: 90%;">
<tr>
<td style="width: 100px;">
<input type="file" name="uploadify" id="uploadify" />
</td>
<td align="left">
<a href="javascript:$('#uploadify').uploadify('upload','*')">開始上傳</a>|
<a href="javascript:jQuery('#uploadify').uploadify('cancel', '*')">取消上傳</a>
</td>
</tr>
</table>
<div id="fileQueue" style="width: 300px;height: auto; border: 0px solid green;overflow: auto"></div>
<input type="hidden" name="fileids" value="" id='fileids'/>
</body>
</html>
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