Android客户端上传文件到服务器端

1/** 
2         * 上传文件 
3         */  
4        public static String sendFile(String urlPath, String filePath,  
5                String newName) throws Exception {  
6            String end = "\r\n";  
7            String twoHyphens = "--";  
8            String boundary = "*****";  
9      
10            URL url = new URL(urlPath);  
11            HttpURLConnection con = (HttpURLConnection) url.openConnection();  
12            /* 允许Input、Output，不使用Cache */  
13            con.setDoInput(true);  
14            con.setDoOutput(true);  
15            con.setUseCaches(false);  
16            /* 设置传送的method=POST */  
17            con.setRequestMethod("POST");  
18            /* setRequestProperty */  
19      
20            con.setRequestProperty("Connection", "Keep-Alive");  
21            con.setRequestProperty("Charset", "UTF-8");  
22            con.setRequestProperty("Content-Type", "multipart/form-data;boundary="  
23                    + boundary);  
24            /* 设置DataOutputStream */  
25            DataOutputStream ds = new DataOutputStream(con.getOutputStream());  
26            ds.writeBytes(twoHyphens + boundary + end);  
27            ds.writeBytes("Content-Disposition: form-data; "  
28                    + "name=\"file1\";filename=\"" + newName + "\"" + end);  
29            ds.writeBytes(end);  
30      
31            /* 取得文件的FileInputStream */  
32            FileInputStream fStream = new FileInputStream(filePath);  
33            /* 设置每次写入1024bytes */  
34            int bufferSize = 1024;  
35            byte[] buffer = new byte[bufferSize];  
36      
37            int length = -1;  
38            /* 从文件读取数据至缓冲区 */  
39            while ((length = fStream.read(buffer)) != -1) {  
40                /* 将资料写入DataOutputStream中 */  
41                ds.write(buffer, 0, length);  
42            }  
43            ds.writeBytes(end);  
44            ds.writeBytes(twoHyphens + boundary + twoHyphens + end);  
45      
46            /* close streams */  
47            fStream.close();  
48            ds.flush();  
49      
50            /* 取得Response内容 */  
51            InputStream is = con.getInputStream();  
52            int ch;  
53            StringBuffer b = new StringBuffer();  
54            while ((ch = is.read()) != -1) {  
55                b.append((char) ch);  
56            }  
57            /* 关闭DataOutputStream */  
58            ds.close();  
59            return b.toString();  
60        }

原帖地址：http://blog.csdn.net/lk\_blog/article/details/7706348