找了好久终于在网上找到了ajax异步上传文件的方法，不过网上大多数是php的 ，我改为struts2写的 大同小异，希望对学习java的人有一定的帮助。我上传的是音乐文件。ajaxfileupload.js这个js文件是主要文件，一定要导入。
jsp页面 ，其中我还做了div的隐藏*****************************
<%@ 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 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>Uploadify</title>
<style type="text/css">
#div1{
color: #000000; font-size: 12px;
border: 0px solid #74B3DC;
color: #000;
background: #fff;
display:none;
}
</style>
<script type="text/javascript" src="js/jquery-1.3.2.min.js"></script>
<script type="text/javascript" src="js/ajaxfileupload.js"></script>
<!-- 执行上传文件操作的函数 -->
<script type="text/javascript">
function ajaxFileUpload(){
$.ajaxFileUpload(
{
url:'uploadAction.action', //需要链接到
服务器地址
secureuri:false,
fileElementId:'upload', //文件选择框的id属性
dataType: 'json', //服务器返回的格式
success: function (data, status) //相当于java中try语句块的用法
{
// alert(data);
var ss =data;
// alert(ss);
var mp3Name = ss.split(";");
for(var i=0; i<mp3Name.length;i++) {
//alert(mp3Name[i]);
$('#songName').val(mp3Name[0]);
$('#songsiger').val(mp3Name[1]);
}
$('#result').html('添加成功');
},
error: function (data, status, e) //相当于java中catch语句块的用法
{
//alert("222.");
$('#result').html('添加失败');
}
}
);
target=document.getElementById('div1');
if (target.style.display=="block"){
target.style.display="none";
} else {
target.style.display="block";
}
}
</script>
</head>
<body>
<form method="post" action="uploadAction.action" enctype="multipart/form-data">
<input type="file" id="upload" name="upload"/>
<input type="button" value="上传文档" onclick="ajaxFileUpload()"/>
<div id="result"></div>
<div id="div1">
歌曲<input type="text" id="songName" name="songName" value="">
歌手 <input type="text" id="songsiger" name="songName" value="">
<input type="button" value="提交文档信息" />
</div>
</form>
</body>
</html>
action上传后台代码*************************************
package action;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.commons.io.FileUtils;
import org.apache.struts2.json.annotations.JSON;
import org.farng.mp3.MP3File;
import org.farng.mp3.TagException;
import org.farng.mp3.id3.AbstractID3v2;
import org.farng.mp3.id3.ID3v1;
import org.farng.mp3.lyrics3.AbstractLyrics3;
import com.base.BaseAction;
import com.opensymphony.xwork2.ActionSupport;
public class Upload extends BaseAction {
private static final long serialVersionUID = -4848248679889814408L;
private String fileName;
private File upload;
public File getUpload() {
return upload;
}
public void setUpload(File upload) {
this.upload = upload;
}
public void setUploadFileName(String fileName) {
this.fileName = fileName;
}
/*
* 歌曲上传 上传操作
*/
public void uploadAction() throws IOException {
System.out.println("进入了该方法！");
String targetDirectory = "D:\\upload";
System.out.println(upload);
File target = new File(targetDirectory, fileName);
FileUtils.copyFile(upload, target);
String path = targetDirectory+"\\"+fileName;
try {
MP3File file = new MP3File(path);//1,lyrics
AbstractID3v2 id3v2 = file.getID3v2Tag();
ID3v1 id3v1 = file.getID3v1Tag();
String ss = "";
if (id3v2 != null) {
System.out.println("id3v2");
ss = id3v2.getAlbumTitle()+";"+id3v2.getSongTitle()+";"+id3v2.getLeadArtist();
//String str = "{'msg','"+ss+"'}";
String str = ss;
outPut(str);
System.out.println(id3v2.getAlbumTitle());//专辑名
System.out.println(id3v2.getSongTitle());//歌曲名
System.out.println(id3v2.getLeadArtist());//歌手
} else {
System.out.println("id3v1");
System.out.println(id3v1.getAlbumTitle());
System.out.println(id3v1.getSongTitle());
System.out.println(id3v1.getLeadArtist());
}
AbstractLyrics3 lrc3Tag = file.getLyrics3Tag();
if (lrc3Tag != null) {
String lyrics = lrc3Tag.getSongLyric();
System.out.println(lyrics);
}
} catch (IOException e) {
e.printStackTrace();
} catch (TagException e) {
e.printStackTrace();
}
System.out.println("over");
}
}
struts.xml配置文件*********************************
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.i18n.encoding" value="UTF-8"/>
//设置上传文件最大量
<constant name="struts.multipart.maxSize" value="10485760"/>
<package name="upload" namespace="/" extends="struts-default" >
<action name="uploadAction" class="action.Upload" method="uploadAction">
<result name="success">/index.jsp</result>
</action>
</package>
</struts>
后来经过调试，发现火狐和ie不兼容 导致无执行争取结果，所以我上传ajaxfileupload.js 我修改了源码
附件：http://down.51cto.com/data/2359651
