1、首先需要對應的JAR包 匯入 httpmime-4.1.1.jar

1. package url;  
2. import io.IoStreamUtil;  
3. import java.io.File;  
4. import java.io.IOException;  
5. import java.io.InputStream;  
6. import org.apache.http.HttpEntity;  
7. import org.apache.http.HttpResponse;  
8. import org.apache.http.client.ClientProtocolException;  
9. import
    org.apache.http.client.HttpClient;  
10. import org.apache.http.client.methods.HttpPost;  
11. import org.apache.http.entity.mime.MultipartEntity;  
12. import org.apache.http.entity.mime.content.FileBody;  
13. import org.apache.http.entity.mime.content.StringBody;  
14. import org.apache.http.impl.client.DefaultHttpClient;  
15. /** 
16.  * httpclient上傳檔案 
17.  * @author linwei 
18.  * 
19.  */
20. publicclass MultipartEntityUtil {  
21.     publicstatic String postFile(File file,String url) throws ClientProtocolException, IOException {  
22.         FileBody bin = null;  
23.         HttpClient httpclient = new DefaultHttpClient();  
24.         HttpPost httppost = new
     HttpPost(url);  
25.         if(file != null) {  
26.             bin = new FileBody(file);  
27.         }  
28.         StringBody username = new StringBody("13696900475");  
29.         StringBody password = new StringBody("13696900475");  
30. //請記住，這邊傳遞漢字會出現亂碼，解決方法如下,設定好編碼格式就好
31.                 //new StringBody("漢字",Charset.forName("UTF-8")));  
32.         MultipartEntity reqEntity = new MultipartEntity();  
33.         reqEntity.addPart("username", username);  
34.         reqEntity.addPart("password", password);  
35.         reqEntity.addPart("data", bin);  
36.         httppost.setEntity(reqEntity);  
37.         System.out.println("執行: " + httppost.getRequestLine());  
38.         HttpResponse response = httpclient.execute(httppost);  
39.         System.out.println("statusCode is " + response.getStatusLine().getStatusCode());  
40.         HttpEntity resEntity = response.getEntity();  
41.         System.out.println("----------------------------------------");  
42.         System.out.println(response.getStatusLine());  
43.         if (resEntity != null) {  
44.           System.out.println("返回長度: " + resEntity.getContentLength());  
45.           System.out.println("返回型別: " + resEntity.getContentType());  
46.           InputStream in = resEntity.getContent();  
47.           System.out.println("in is " + in);  
48.           System.out.println(IoStreamUtil.getStringFromInputStream(in));  
49.         }  
50.         if (resEntity != null) {  
51.           resEntity.consumeContent();  
52.         }  
53.         returnnull;  
54.     }  
55.     publicstaticvoid main(String[] args) throws ClientProtocolException, IOException {  
56.         File file = new File("d:/rss.xml");  
57.         String url = "http://localhost:8080/webtest/servlet/URLTest";  
58.         postFile(file,url);  
59.     }  
60. }  

2. 服務端的接收解析程式碼(同樣的，服務端也需要匯入上面提到的JAR包) (特別註釋：在servlet中直接獲取的request是可以正常解析的，但是，在ACTION中獲取的request則是通過ACTION內部的類進行了封裝，因此，在ACTION中執行以下程式碼，upload.parseRequest(request)方法執行返回的是空的，暫沒找到解決辦法。)

1. //commons-fileupload.jar  commons-io 
2. request.setCharacterEncoding("UTF-8");  
3. boolean isMultipart = ServletFileUpload.isMultipartContent(request);  
4.           FileItemFactory factory = new DiskFileItemFactory();    
5.             ServletFileUpload upload = new ServletFileUpload(factory);    
6.             try {     
7.                 List items = upload.parseRequest(request);    
8.                 Iterator iter = items.iterator();    
9.                 while (iter.hasNext()) {    
10.                     FileItem item = (FileItem) iter.next();    
11.                     if (item.isFormField()) {    
12.                         //普通文字資訊處理  
13.                         String paramName = item.getFieldName();    
14.                         String paramValue = item.getString();    
15.                         System.out.println(paramName + ":" + paramValue);    
16.                     } else {    
17.                         //上傳檔案資訊處理  
18.                         String fileName = item.getName();    
19.                         byte[] data = item.get();    
20.                         String filePath = "d:/ssssss.txt";    
21.                         FileOutputStream fos = new FileOutputStream(filePath);    
22.                         fos.write(data);    
23.                         fos.close();    
24.                     }    
25.                 }     
26.             } catch (FileUploadException e) {    
27.                 e.printStackTrace();    
28.             }    
29.         }