android 使用post方式上传文件

转载自：http://blog.csdn.net/banyingli/article/details/6820436

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1. public static String post(String actionUrl, Map<String, String> params,  
2.         Map<String, File> files) throws IOException {  
3.   
4.     String BOUNDARY = java.util.UUID.randomUUID().toString();  
5.     String PREFIX = "--", LINEND = "\r\n";  
6.     String MULTIPART_FROM_DATA = "multipart/form-data";  
7.     String CHARSET = "UTF-8";  
8.     URL uri = new URL(actionUrl);  
9.     HttpURLConnection conn = (HttpURLConnection) uri.openConnection();  
10.     conn.setReadTimeout(5 * 1000);  
11.     conn.setDoInput(true);// 允许输入  
12.     conn.setDoOutput(true);// 允许输出  
13.     conn.setUseCaches(false);  
14.     conn.setRequestMethod("POST"); // Post方式  
15.     conn.setRequestProperty("connection", "keep-alive");  
16.     conn.setRequestProperty("Charsert", "UTF-8");  
17.     conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA  
18.             + ";boundary=" + BOUNDARY);  
19.   
20.     // 首先组拼文本类型的参数  
21.     StringBuilder sb = new StringBuilder();  
22.     for (Map.Entry<String, String> entry : params.entrySet()) {  
23.         sb.append(PREFIX);  
24.         sb.append(BOUNDARY);  
25.         sb.append(LINEND);  
26.         sb.append("Content-Disposition: form-data; name=\""  
27.                 + entry.getKey() + "\"" + LINEND);  
28.         sb.append("Content-Type: text/plain; charset=" + CHARSET + LINEND);  
29.         sb.append("Content-Transfer-Encoding: 8bit" + LINEND);  
30.         sb.append(LINEND);  
31.         sb.append(entry.getValue());  
32.         sb.append(LINEND);  
33.     }  
34.   
35.     DataOutputStream outStream = new DataOutputStream(conn  
36.             .getOutputStream());  
37.     outStream.write(sb.toString().getBytes());  
38.   
39.     // 发送文件数据  
40.     if (files != null)  
41.         for (Map.Entry<String, File> file : files.entrySet()) {  
42.             StringBuilder sb1 = new StringBuilder();  
43.             sb1.append(PREFIX);  
44.             sb1.append(BOUNDARY);  
45.             sb1.append(LINEND);  
46.             sb1  
47.                     .append("Content-Disposition: form-data; name=\"file\"; filename=\""  
48.                             + file.getKey() + "\"" + LINEND);  
49.             sb1.append("Content-Type: application/octet-stream; charset="  
50.                     + CHARSET + LINEND);  
51.             sb1.append(LINEND);  
52.             outStream.write(sb1.toString().getBytes());  
53.             InputStream is = new FileInputStream(file.getValue());  
54.             byte[] buffer = new byte[1024];  
55.             int len = 0;  
56.             while ((len = is.read(buffer)) != -1) {  
57.                 outStream.write(buffer, 0, len);  
58.             }  
59.   
60.             is.close();  
61.             outStream.write(LINEND.getBytes());  
62.         }  
63.   
64.     // 请求结束标志  
65.     byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();  
66.     outStream.write(end_data);  
67.     outStream.flush();  
68.   
69.     // 得到响应码  
70.     int res = conn.getResponseCode();  
71.     InputStream in = conn.getInputStream();  
72.     InputStreamReader isReader = new InputStreamReader(in);  
73.     BufferedReader bufReader = new BufferedReader(isReader);  
74.     String line = null;  
75.     String data = "OK";  
76.   
77.     while ((line = bufReader.readLine()) != null)  
78.         data += line;  
79.   
80.     if (res == 200) {  
81.         int ch;  
82.         StringBuilder sb2 = new StringBuilder();  
83.         while ((ch = in.read()) != -1) {  
84.             sb2.append((char) ch);  
85.         }  
86.     }  
87.     outStream.close();  
88.     conn.disconnect();  
89.     return in.toString();  
90. }  
91.