jquery之ajaxfileupload异步下传插件

点我下载工程代码
由于项目需求，在处理文件上传时需要使用到文件的异步上传。这里使用Jquery Ajax File Uploader这个组件下载地址：http://www.phpletter.com/download_project_version.php?version_id=6
服务器端采用struts2来处理文件上传。
所需环境：
jquery.js
ajaxfileupload.js
struts2所依赖的jar包
及struts2-json-plugin-2.1.8.1.jar
编写文件上传的Action

package?com.ajaxfile.action;

import?java.io.File;
import?java.io.FileInputStream;
import?java.io.FileOutputStream;

import?org.apache.struts2.ServletActionContext;

import?com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public?class?FileAction?extends?ActionSupport?{

????private?File?file;
????private?String?fileFileName;
????private?String?fileFileContentType;

????private?String?message?=?"你已成功上传文件";
????
????public?String?getMessage()?{
????????return?message;
????}

????public?void?setMessage(String?message)?{
????????this.message?=?message;
????}

????public?File?getFile()?{
????????return?file;
????}

????public?void?setFile(File?file)?{
????????this.file?=?file;
????}

????public?String?getFileFileName()?{
????????return?fileFileName;
????}

????public?void?setFileFileName(String?fileFileName)?{
????????this.fileFileName?=?fileFileName;
????}

????public?String?getFileFileContentType()?{
????????return?fileFileContentType;
????}

????public?void?setFileFileContentType(String?fileFileContentType)?{
????????this.fileFileContentType?=?fileFileContentType;
????}

????@SuppressWarnings("deprecation")
????@Override
????public?String?execute()?throws?Exception?{
????????
????????String?path?=?ServletActionContext.getRequest().getRealPath("/upload");

????????try?{
????????????File?f?=?this.getFile();
????????????if(this.getFileFileName().endsWith(".exe")){
????????????????message="对不起,你上传的文件格式不允许!!!";
????????????????return?ERROR;
????????????}
????????????FileInputStream?inputStream?=?new?FileInputStream(f);
????????????FileOutputStream?outputStream?=?new?FileOutputStream(path?+?"/"+?this.getFileFileName());
????????????byte[]?buf?=?new?byte[1024];
????????????int?length?=?0;
????????????while?((length?=?inputStream.read(buf))?!=?-1)?{
????????????????outputStream.write(buf,?0,?length);
????????????}
????????????inputStream.close();
????????????outputStream.flush();
????????}?catch?(Exception?e)?{
????????????e.printStackTrace();
????????????message?=?"对不起,文件上传失败了!!!!";
????????}
????????return?SUCCESS;
????}

}
struts.xml
<?xml?version="1.0"?encoding="UTF-8"??>
<!DOCTYPE?struts?PUBLIC?"-//Apache?Software?Foundation//DTD?Struts?Configuration?2.1//EN"?"http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
????<package?name="struts2"?extends="json-default">
????????<action?name="fileUploadAction"?class="com.ajaxfile.action.FileAction">
????????????<result?type="json"?name="success">
????????????????<param?name="contentType">
????????????????????text/html
????????????????</param>
????????????</result>
????????????<result?type="json"?name="error">
????????????????<param?name="contentType">
????????????????????text/html
????????????????</param>
????????????</result>
????????</action>
????</package>
</struts>????
注意结合Action观察struts.xml中result的配置。?

contentType参数是一定要有的，否则浏览器总是提示将返回的JSON结果另存为文件，不会交给ajaxfileupload处理。这是因为struts2 JSON Plugin默认的contentType为application/json，而ajaxfileupload则要求为text/html。