日期:2014-05-16  浏览次数:20760 次

Struts2 、jquery之ajaxfileupload异步上传插件

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。
文件上传的jsp页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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">
        <title>Insert title here</title>
        <script type="text/javascript" sr