将本地图片或者网上图片用post方式上传到图片服务器

一个简单的应用 
Java代码  

1. package com.bj95ol.test;  
2.   
3. import java.io.BufferedReader;  
4. import java.io.File;  
5. import java.io.FileNotFoundException;  
6. import java.io.FileOutputStream;  
7. import java.io.IOException;  
8. import java.io.InputStream;  
9. import java.io.InputStreamReader;  
10. import java.io.OutputStreamWriter;  
11. import java.io.PrintWriter;  
12. import java.net.HttpURLConnection;  
13. import java.net.MalformedURLException;  
14. import java.net.URL;  
15.   
16. import javax.servlet.ServletInputStream;  
17. import javax.servlet.http.HttpServletRequest;  
18.   
19. import sun.misc.BASE64Decoder;  
20. import sun.misc.BASE64Encoder;  
21.   
22. public class SendImgToWeb {  
23.     /** 
24.      * 获得网络图片地址。或者图片地址 
25.      * @param url 
26.      * @return 
27.      */  
28.     public String getContentFromWeb(String url)  
29.     {  
30.         String filecontent="";  
31.         InputStream is=null;  
32.         BASE64Encoder base=new BASE64Encoder();  
33.         if(url.startsWith("http"))  
34.         {  
35.             try {  
36.                 HttpURLConnection urlconn=(HttpURLConnection)new URL(url).openConnection();  
37.                 is=urlconn.getInputStream();  
38.             } catch (MalformedURLException e) {  
39.                 // TODO Auto-generated catch block  
40.                 e.printStackTrace();  
41.             } catch (IOException e) {  
42.                 // TODO Auto-generated catch block  
43.                 e.printStackTrace();  
44.             }  
45.         }  
46.         int n=0;  
47.         byte[] b=null;  
48.         try {  
49.             while((n=is.available())>0)  
50.             {  
51.                 n=is.read(b);  
52.                 if(n==-1)break;  
53.                 filecontent=filecontent+base.encode(b);  
54.                   
55.             }  
56.             is.close();  
57.         } catch (IOException e) {  
58.             // TODO Auto-generated catch block  
59.             e.printStackTrace();  
60.         }  
61.         return filecontent;  
62.     }  
63.       
64.     /** 
65.      * 将图片内容用post方式发送到url中 
66.      * @param url 
67.      * @param postcontent 
68.      */  
69.       
70.     public void sendImgbyPost(String url,String postcontent)  
71.     {  
72.         try {  
73.             HttpURLConnection huc=(HttpURLConnection)new URL(url).openConnection();  
74.             huc.setDoInput(true);  
75.             huc.setDoOutput(true);  
76.             huc.setRequestMethod("POST");  
77.               
78.             PrintWriter pw=new PrintWriter(new OutputStreamWriter(huc.getOutputStream()));  
79.             pw.print(postcontent);  
80.             pw.close();  
81.               
82.             BufferedReader br=new BufferedReader(new InputStreamReader(huc.getInputStream()));  
83.             String content="";  
84.             String line=br.readLine();  
85.             while(line!=null)  
86.             {  
87.                 content=content+line;  
88.                 line=br.readLine();  
89.                   
90.             }  
91.               
92.         } catch (MalformedURLException e) {  
93.             // TODO Auto-generated catch block  
94.             e.printStackTrace();  
95.         } catch (IOException e) {  
96.             // TODO Auto-generated catch block  
97.             e.printStackTrace();  
98.         }  
99.           
100.     }  
101.     /** 
102.      * 在服务器端获取发送过来的内容 
103.      * @param request 
104.      * @return 
105.      */  
106.     public String receiveContent(HttpServletRequest request)  
107.     {  
108.         int a = 0;  
109.          byte[] b = new byte[4096];  
110.         String result="";  
111.         try  
112.         {  
113.          ServletInputStream sis=request.getInputStream();  
114.         int line=sis.readLine(b, 0, b.length);  
115.         while(line!=-1)  
116.         {  
117.         result=result+new String(b,0,line);  
118.         line=sis.readLine(b, 0, b.length);  
119.         }  
120.         }  
121.         catch(Exception e)  
122.         {  
123.         e.printStackTrace();  
124.         }  
125.         return  result;  
126.     }  
127.       
128.     /** 
129.      * 将接受过来的信息生成文件 
130.      * @param request 
131.      * @param filename 
132.      */  
133.     public void createFile(HttpServletRequest request,String filename)  
134.     {  
135.         File file=new File(filename);  
136.         try {  
137.             FileOutputStream fos=new FileOutputStream(file);  
138.             String content=receiveContent(request);  
139.             BASE64Decoder base=new BASE64Decoder();  
140.             byte[] b=base.decodeBuffer(content);  
141.             fos.write(b);  
142.             fos.close();  
143.               
144.         } catch (FileNotFoundException e) {  
145.             // TODO Auto-generated catch block  
146.             e.printStackTrace();  
147.         } catch (IOException e) {  
148.             // TODO Auto-generated catch block  
149.             e.printStackTrace();  
150.         }  
151.           
152.     }  
153.   
154. }