flex+java上传

在研究Flex DataGrid导入excel时，用到了Flex的文件上传功能。 （参见我的Blog：http://cwfmaker.javaeye.com/blog/539449） 在Adobe的Flex RIA编程环境下，是无法读取本地文件的（据我所知），但是我们可以依赖于Flex调用后台的代码实现文件上传功能，我这里是利用Flex的URLRequest来向java的Servlet传送一个Http请求（Servlet集成自HttpServlet ，已实现文件上传功能），而Servlet响应请求之后会利用Apcahe的开源Jar包(org.apache.commons.fileupload.servlet.ServletFileUpload类)完成文件的生成。 通过以上原理就可以利用Flex+java实现文件上传。（这里也是参考了网上的一些文章）

 

   java Servlet 代码

Java代码

1. package com.yyhy.java.util;   
2.   
3. //多文件上传的Java端的类   
4. import javax.servlet.http.HttpServlet;   
5. import javax.servlet.http.HttpServletRequest;   
6. import javax.servlet.http.HttpServletResponse;   
7. import javax.servlet.ServletException;   
8. import java.util.List;   
9. import java.util.Iterator;   
10. import java.io.File;   
11. import java.io.IOException;   
12. import java.io.UnsupportedEncodingException;   
13. import java.net.URLDecoder;   
14. import org.apache.commons.fileupload.FileUploadException;   
15. import org.apache.commons.fileupload.disk.DiskFileItemFactory;   
16. import org.apache.commons.fileupload.servlet.ServletFileUpload;   
17. import org.apache.commons.fileupload.FileItem;   
18. import org.apache.log4j.Logger;   
19. import org.apache.commons.lang.ObjectUtils;   
20. import org.springframework.context.ApplicationContext;   
21. import org.springframework.context.support.ClassPathXmlApplicationContext;   
22.   
23.   
24. public class FileUploadAction extends HttpServlet {   
25.   
26.     // 限制文件的上传大小   
27.     private int maxPostSize = 100 * 1024 * 1024;   
28.     //文件上传地址   
29.     private String uploadPath;   
30.   
31.     public FileUploadAction() {   
32.         //从配置文件中取得文件上传地址   
33.         setUploadPath();   
34.     }   
35.     public String getUploadPath() {   
36.         return uploadPath;   
37.     }   
38.     public void setUploadPath() {   
39.         //从配置文件中取得文件上传地址   
40.         ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");   
41.         ServerAddress serverAddressBean=(ServerAddress)context.getBean("ServerAddressBean");   
42.         this.uploadPath = serverAddressBean.getUploadPath().trim();   
43.     }      
44.     // 文件上传   
45.     public void service(HttpServletRequest request, HttpServletResponse response)   
46.             throws ServletException   
47.             {   
48.             this.doUploadAdd(request, response);   
49.     }   
50.        
51.     private void logger(String info) {   
52.         System.out.println(info);   
53.     }   
54.        
55.     protected void doGet(HttpServletRequest request, HttpServletResponse response)      
56.     throws ServletException, IOException {      
57.         doUploadAdd(request, response);      
58.      }   
59.        
60.     protected void doPost(HttpServletRequest request, HttpServletResponse response)      
61.     throws ServletException, IOException {      
62.         doUploadAdd(request, response);      
63.      }   
64.        
65.     private void doUploadAdd(HttpServletRequest request,   
66.             HttpServletResponse response) throws ServletException {   
67.         logger("begin to upload");   
68.         try {   
69.             request.setCharacterEncoding("UTF-8");// 防止文件名称带有汉字后传到服务器乱码        
70.             //建立文件夹   
71.             this.makeDir(uploadPath);   
72.         } catch (UnsupportedEncodingException e) {   
73.             // TODO Auto-generated catch block   
74.             e.printStackTrace();   
75.         }   
76.         saveFiletoServer(request,response,uploadPath);   
77.     }   
78.        
79.     private void doUploadDelete(HttpServletRequest request,HttpServletResponse response) throws ServletException    
80.     {   
81.         String dirtyStr = "";//需要删除的文件名（单个文件）或文件夹名列表   
82.         try    
83.         {   
84.             if (request.getParameter("dirtyStr") != null) {   
85.                 dirtyStr=URLDecoder.decode(request.getParameter("dirtyStr"),"utf-8");//前台ENCODE,后台DECODE   
86.                 logger("删除的文件（夹）为:" + dirtyStr);   
87.             }   
88.         }   
89.         catch (Exception e) {   
90.             // TODO Auto-generated catch block   
91.             logger(e.getMessage());   
92.         }   
93.   
94.         try {   
95.             new DeleteFiles().DeleteModifyFiles(dirtyStr, uploadPath);   
96.         } catch (Exception e) {   
97.             logger(e.getMessage());   
98.         }   
99.     }   
100.     //保存文件到服务器中   
101.     private void saveFiletoServer(HttpServletRequest request,HttpServletResponse response,String uploadPath)   
102.     {   
103.         // 操作文件   
104.         response.setContentType("text/html; charset=UTF-8");   
105.         DiskFileItemFactory factory = new DiskFileItemFactory();   
106.         factory.setSizeThreshold(1024 * 4);   
107.         ServletFileUpload upload = new ServletFileUpload(factory);   
108.         upload.setFileSizeMax(maxPostSize);   
109.         logger("request========" + ObjectUtils.toString(request));   
110.         List fileItems = null;   
111.         try {   
112.             fileItems = upload.parseRequest(request);   
113.             logger("============" + ObjectUtils.toString(fileItems));   
114.             Iterator iter = fileItems.iterator();   
115.             while (iter.hasNext()) {   
116.                 FileItem item = (FileItem) iter.next();   
117.                 log(item.toString());   
118.                 if (!item.isFormField()) {   
119.                     String name = item.getName();   
120.                     logger("上传的文件名 = " + name);   
121.                     try {   
122.                         item.write(new File(uploadPath + name));   
123.                     } catch (Exception ex) {   
124.                         logger(ex.getMessage());   
125.                     }   
126.                 }   
127.             }   
128.         } catch (FileUploadException ex1) {   
129.             logger("FileUploadException->" + ex1.getMessage());   
130.         }   
131.     }   
132.     // 建立文件夹路径   
133.     private boolean makeDir(String uploadPath) {   
134.         boolean isOK = false;   
135.         try {   
136.             File file = new File(uploadPath);   
137.             file.mkdirs();   
138.             isOK = true;   
139.         } catch (Exception e) {   
140.             isOK = false;   
141.         } finally {   
142.             return isOK;   
143.         }   
144.     }   
145.     // 建立文件夹路径   
146.     private boolean makeDirs(String uploadPath, String newDocStr) {   
147.         boolean isOK = false;   
148.         File file;   
149.         String[] temp;   
150.         try {   
151.             temp = newDocStr.split(",");   
152.             for (int i = 0; i < temp.length; i++) {   
153.                 file = new File(uploadPath + temp[i] + "\\");   
154.                 file.mkdirs();   
155.             }   
156.             isOK = true;   
157.         } catch (Exception e) {   
158.             isOK = false;   
159.         } finally {   
160.             return isOK;   
161.         }   
162.     }   
163. }  

package com.yyhy.java.util;    //多文件上传的Java端的类  import javax.servlet.http.HttpServlet;  import javax.servlet.http.HttpServletRequest;  import javax.servlet.http.HttpServletResponse;  import javax.servlet.ServletException;  import java.util.List;  import java.util.Iterator;  import java.io.File;  import java.io.IOException;  import java.io.UnsupportedEncodingException;  import java.net.URLDecoder;  import org.apache.commons.fileupload.FileUploadException;  import org.apache.commons.fileupload.disk.DiskFileItemFactory;  import org.apache.commons.fileupload.servlet.ServletFileUpload;  import org.apache.commons.fileupload.FileItem;  import org.apache.log4j.Logger;  import org.apache.commons.lang.ObjectUtils;  import org.springframework.context.ApplicationContext;  import org.springframework.context.support.ClassPathXmlApplicationContext;      public class FileUploadAction extends HttpServlet {     // 限制文件的上传大小   private int maxPostSize = 100 * 1024 * 1024;   //文件上传地址   private String uploadPath;     public FileUploadAction() {    //从配置文件中取得文件上传地址    setUploadPath();   }   public String getUploadPath() {    return uploadPath;   }   public void setUploadPath() {    //从配置文件中取得文件上传地址    ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");    ServerAddress serverAddressBean=(ServerAddress)context.getBean("ServerAddressBean");    this.uploadPath = serverAddressBean.getUploadPath().trim();   }    // 文件上传   public void service(HttpServletRequest request, HttpServletResponse response)     throws ServletException     {     this.doUploadAdd(request, response);   }      private void logger(String info) {    System.out.println(info);   }      protected void doGet(HttpServletRequest request, HttpServletResponse response)         throws ServletException, IOException {       doUploadAdd(request, response);          }      protected void doPost(HttpServletRequest request, HttpServletResponse response)         throws ServletException, IOException {       doUploadAdd(request, response);          }      private void doUploadAdd(HttpServletRequest request,     HttpServletResponse response) throws ServletException {    logger("begin to upload");    try {     request.setCharacterEncoding("UTF-8");// 防止文件名称带有汉字后传到服务器乱码       //建立文件夹     this.makeDir(uploadPath);    } catch (UnsupportedEncodingException e) {     // TODO Auto-generated catch block     e.printStackTrace();    }    saveFiletoServer(request,response,uploadPath);   }      private void doUploadDelete(HttpServletRequest request,HttpServletResponse response) throws ServletException    {    String dirtyStr = "";//需要删除的文件名（单个文件）或文件夹名列表    try     {     if (request.getParameter("dirtyStr") != null) {      dirtyStr=URLDecoder.decode(request.getParameter("dirtyStr"),"utf-8");//前台ENCODE,后台DECODE      logger("删除的文件（夹）为:" + dirtyStr);     }    }    catch (Exception e) {     // TODO Auto-generated catch block     logger(e.getMessage());    }      try {     new DeleteFiles().DeleteModifyFiles(dirtyStr, uploadPath);    } catch (Exception e) {     logger(e.getMessage());    }   }   //保存文件到服务器中   private void saveFiletoServer(HttpServletRequest request,HttpServletResponse response,String uploadPath)   {    // 操作文件    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("上传的文件名 = " + name);       try {        item.write(new File(uploadPath + name));       } catch (Exception ex) {        logger(ex.getMessage());       }      }     }    } catch (FileUploadException ex1) {     logger("FileUploadException->" + ex1.getMessage());    }   }   // 建立文件夹路径   private boolean makeDir(String uploadPath) {    boolean isOK = false;    try {     File file = new File(uploadPath);     file.mkdirs();     isOK = true;    } catch (Exception e) {     isOK = false;    } finally {     return isOK;    }   }   // 建立文件夹路径   private boolean makeDirs(String uploadPath, String newDocStr) {    boolean isOK = false;    File file;    String[] temp;    try {     temp = newDocStr.split(",");     for (int i = 0; i < temp.length; i++) {      file = new File(uploadPath + temp[i] + "\\");      file.mkdirs();     }     isOK = true;    } catch (Exception e) {     isOK = false;    } finally {     return isOK;    }   }  }

   

 

    Flex前台代码：

Actionscript代码

1. <?xml version="1.0" encoding="utf-8"?>   
2. <mx:TitleWindow xmlns:fx="http://ns.adobe.com/mxml/2009"    
3.                 xmlns:s="library://ns.adobe.com/flex/spark"    
4.                 xmlns:mx="library://ns.adobe.com/flex/halo" layout="absolute" width="400" height="300"  
5.                 creationComplete="CreationCompletedHandler()"  
6.                 showCloseButton="true">   
7.     <fx:Script>   
8.         <![CDATA[   
9.             import mx.controls.Alert;   
10.             import mx.events.CloseEvent;   
11.             import mx.managers.PopUpManager;   
12.             import mx.utils.StringUtil;   
13.                
14.             [Bindable]   
15.             private var _filename:String;   
16.   
17.             public function get filename():String   
18.             {   
19.                 return _filename;   
20.             }   
21.   
22.             public function set filename(value:String):void   
23.             {   
24.                 _filename = value;   
25.             }   
26.   
27.                
28.             [Bindable]   
29.             private var _file:FileReference=new FileReference();    
30.   
31.             public function get file():FileReference   
32.             {   
33.                 return _file;   
34.             }   
35.   
36.             public function set file(value:FileReference):void   
37.             {   
38.                 _file = value;   
39.             }   
40.   
41.   
42.             [Bindable]   
43.             private var _serveraddress:String;   
44.   
45.             public function get serveraddress():String   
46.             {   
47.                 return _serveraddress;   
48.             }   
49.   
50.             public function set serveraddress(value:String):void   
51.             {   
52.                 _serveraddress = value;   
53.             }   
54.   
55.             /**creationComplete完成之后调用，获取服务器地址，建立事件监听   
56.              * @param null   
57.              * @author 陈文锋 54cwf@163.com   
58.              * @return void   
59.              * */   
60.             public function CreationCompletedHandler():void   
61.             {      
62.                 Security.allowDomain("*");   
63.                 var urlLoader:URLLoader=new URLLoader(new URLRequest("assets/conf/ServerAddressConfig.xml"));   
64.                 urlLoader.addEventListener(Event.COMPLETE,CompletedHandler);   
65.                 this.addEventListener(Event.CLOSE,TitleWindowClose);   
66.                 file.addEventListener(ProgressEvent.PROGRESS,progressHandler);   
67.                 file.addEventListener(Event.SELECT,selectedHandler);   
68.                 file.addEventListener(IOErrorEvent.IO_ERROR,ioErrorHandler);   
69.             }   
70.                
71.             private function ioErrorHandler(e:IOErrorEvent):void   
72.             {   
73.                 Alert.show(e.toString());   
74.             }   
75.                
76.             private function progressHandler(e:ProgressEvent):void   
77.             {   
78.                 lblProgress.text = " 已上传 " + e.bytesLoaded       
79.                     + " 字节，共 " + e.bytesTotal + " 字节";      
80.                 var proc: uint = e.bytesLoaded / e.bytesTotal * 100;      
81.                 uploadbar.setProgress(proc, 100);      
82.                 uploadbar.label= "当前进度: " + " " + proc + "%";    
83.             }   
84.                
85.             /**Event事件监听处理函数，弹出上传提示窗口   
86.              * @param e，Event类型事件参数   
87.              * @author  54cwf@163.com   
88.              * @return void   
89.              * */   
90.             private function selectedHandler(e:Event):void   
91.             {   
92.                 Alert.show("上传 " + file.name + " (共 "+Math.round(file.size/1024)+"KB)?",      
93.                     "确认上传",      
94.                     Alert.YES|Alert.NO,      
95.                     null,      
96.                     proceedWithUpload);   
97.             }   
98.                
99.             /**CloseEvent事件监听处理函数，访问upload的servlet服务   
100.              * @param e，Event类型事件参数   
101.              * @author  54cwf@163.com   
102.              * @return void   
103.              * */   
104.             private function proceedWithUpload(e:CloseEvent): void{      
105.                 if (e.detail == Alert.YES)   
106.                 {      
107.                     filename=file.name;   
108.                     var request:URLRequest = new URLRequest(StringUtil.trim(serveraddress));      
109.                     try    
110.                     {      
111.                         file.upload(request);      
112.                     }    
113.                     catch (error:Error)    
114.                     {      
115.                         Alert.show("上传失败","错误");   
116.                     }      
117.                        
118.                 }      
119.             }    
120.                
121.             private function upload(): void{    
122.                 var typefiter:FileFilter=new FileFilter("Excel","*.xls");   
123.                 file.browse([typefiter]);      
124.             }   
125.                
126.             /**CloseEvent事件监听处理函数，关闭TitleWindow弹出窗口   
127.              * @param e，事件参数   
128.              * @author  54cwf@163.com   
129.              * @return void   
130.              * */   
131.             private function TitleWindowClose(e:CloseEvent):void   
132.             {   
133.                 PopUpManager.removePopUp(this);   
134.             }   
135.                
136.             /**Event事件监听处理函数，获取配置文件的文件上传路径   
137.              * @param e，事件参数   
138.              * @author  54cwf@163.com   
139.              * @return void   
140.              * */   
141.             private function CompletedHandler(e:Event):void   
142.             {   
143.                 var configurationxml:XML=XML((URLLoader(e.target).data));   
144.                 serveraddress=configurationxml.filesinservername;   
145.             }   
146.         ]]>   
147.     </fx:Script>   
148.     <mx:Canvas width="100%" height="100%">      
149.         <mx:VBox width="100%" horizontalAlign="center">      
150.             <mx:Label id="lblProgress" text="上传"/>      
151.             <mx:ProgressBar id="uploadbar" labelPlacement="bottom" themeColor="#F20D7A"      
152.                             minimum="0" visible="true" maximum="100" label="当前进度: 0%"         
153.                             direction="right" mode="manual" width="200"/>      
154.             <mx:Button label="上传文件" click="upload()"/>                   
155.         </mx:VBox>   
156.     </mx:Canvas>    
157. </mx:TitleWindow>