Flex 实现多文件上传之二：后台部分(java)

http://hi.baidu.com/half_cup_coffee/blog/item/d421001037f02307203f2e7c.html

在《Flex实现多文件上传之一：前台部分》里介绍了使用flex实现多文件上传，一直没时间把后面的放上去。

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

Java 代码

1. package com.nstar.orderexpress.web;  
2.   
3. import javax.servlet.http.HttpServlet;  
4. import org.apache.log4j.Logger;  
5. import javax.servlet.http.HttpServletRequest;  
6. import javax.servlet.http.HttpServletResponse;  
7. import javax.servlet.ServletException;  
8. import org.apache.commons.fileupload.disk.DiskFileItemFactory;  
9. import org.apache.commons.fileupload.servlet.ServletFileUpload;  
10. import java.util.List;  
11. import org.apache.commons.fileupload.FileUploadException;  
12. import java.util.Iterator;  
13. import org.apache.commons.fileupload.FileItem;  
14. import java.io.File;  
15. import java.io.UnsupportedEncodingException;  
16.   
17. import org.apache.commons.lang.ObjectUtils;  
18.   
19. public class FileUploadAction extends HttpServlet{  
20.     private static Logger logger = Logger.getLogger(FileUploadAction.class.getName());  
21.   
22.     private int maxPostSize = 100 * 1024 * 1024;  
23.     private String uploadPath = "D:\\upload\\";  
24.   
25.   
26.     public FileUploadAction() {  
27.     }  
28.   
29.     //文件上传  
30.     public void doPost(HttpServletRequest request, HttpServletResponse response)  
31.         throws ServletException {  
32.         logger("begin upload");  
33.         try {  
34.     request.setCharacterEncoding("UTF-8");//防止文 件名称带有汉字后传到服务器乱码  
35.    } catch (UnsupportedEncodingException e) {  
36.     // TODO Auto-generated catch block  
37.     e.printStackTrace();  
38.    }  
39.         response.setContentType("text/html; charset=UTF-8");  
40.         DiskFileItemFactory factory = new DiskFileItemFactory();  
41.         factory.setSizeThreshold(1024 * 4);  
42.         ServletFileUpload upload = new ServletFileUpload(factory);  
43.         upload.setFileSizeMax(maxPostSize);  
44.   
45.         logger("request================"+ObjectUtils.toString(request));  
46.         List fileItems = null;  
47.         try {  
48.             fileItems = upload.parseRequest(request);  
49.             logger("===================="+ObjectUtils.toString(fileItems));  
50.             Iterator iter = fileItems.iterator();  
51.             while (iter.hasNext()) {  
52.                 FileItem item = (FileItem) iter.next();  
53.                 log(item.toString());  
54.                 if (!item.isFormField()) {  
55.                     String name = item.getName();  
56.                     logger("file name = "+name);  
57.                     try {  
58.                         item.write(new File(uploadPath + name));  
59.                     }  
60.                     catch (Exception ex) {  
61.                         logger(ex.getMessage());  
62.                     }  
63.                 }  
64.             }  
65.         }  
66.         catch (FileUploadException ex1) {  
67.             logger("FileUploadException->"+ex1.getMessage());  
68.         }  
69.   
70.   
71.     }  
72.   
73.     private void logger(String info){  
74.         System.out.println(info);  
75.     }  
76.   
77. }  

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。