Flex实现多文件上传之二：后台部分(java)

这里说一下后台是如何处理上传文件的，用的是java。

上传的功能使用了apache的通用jar包，可以在这里下载。

java代码如下，简单说明下：

1.设置上传目录，这个目录是指web服务器所在机器的目录
2.防止乱码的设置
3.上传功能写在action里，示例直接使用了默认的方法名doPost，如果你要用struts之类的，可以定义自己的方法名称

package com.nstar.orderexpress.web;

import javax.servlet.http.HttpServlet;
import org.apache.log4j.Logger;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import java.util.List;
import org.apache.commons.fileupload.FileUploadException;
import java.util.Iterator;
import org.apache.commons.fileupload.FileItem;
import java.io.File;
import java.io.UnsupportedEncodingException;

import org.apache.commons.lang.ObjectUtils;

public class FileUploadAction extends HttpServlet{
    private static Logger logger = Logger.getLogger(FileUploadAction.class.getName());

    private int maxPostSize = 100 * 1024 * 1024;
    private String uploadPath = "D:\\upload\\";

    public FileUploadAction() {
    }

    //文件上传
    public void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException {
        logger("begin upload");
        try {
    request.setCharacterEncoding("UTF-8");//防止文件名称带有汉字后传到服务器乱码
   } catch (UnsupportedEncodingException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
        response.setContentType("text/html; charset=UTF-8");
        DiskFileItemFactory factory = new DiskFileItemFactory();
        factory.setSizeThreshold(1024 * 4);
        ServletFileUpload upload = new ServletFileUpload(factory);
        upload.setFileSizeMax(maxPostSize);

        logger("request================"+ObjectUtils.toString(request));
        List fileItems = null;
        try {
            fileItems = upload.parseRequest(request);
            logger("===================="+ObjectUtils.toString(fileItems));
            Iterator iter = fileItems.iterator();
            while (iter.hasNext()) {
                FileItem item = (FileItem) iter.next();
                log(item.toString());
                if (!item.isFormField()) {
                    String name = item.getName();
                    logger("file name = "+name);
                    try {
                        item.write(new File(uploadPath + name));
                    }
                    catch (Exception ex) {
                        logger(ex.getMessage());
                    }
                }
            }
        }
        catch (FileUploadException ex1) {
            logger("FileUploadException->"+ex1.getMessage());
        }

    }

    private void logger(String info){
        System.out.println(info);
    }

}

文件上传基本上就这么多了，可以在此基础上去扩展你想要的功能。