android文件上传到服务器

代码非原创，fix了bug，完善的还是需要再思量：
/**
* 通过拼接的方式构造请求内容，实现参数传输以及文件传输
* @param actionUrl
* @param params
* @param files
* @return
* @throws IOException
*/
public static String post(String actionUrl, Map<String, String> params,
    Map<String, File> files) throws IOException {

  String BOUNDARY = java.util.UUID.randomUUID().toString();
  String PREFIX = "--" , LINEND = "\r\n";
  String MULTIPART_FROM_DATA = "multipart/form-data";
  String CHARSET = "UTF-8";

  URL uri = new URL(actionUrl);
  HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
  conn.setReadTimeout(5 * 1000); // 缓存的最长时间
  conn.setDoInput(true);// 允许输入
  conn.setDoOutput(true);// 允许输出
  conn.setUseCaches(false); // 不允许使用缓存
  conn.setRequestMethod("POST");
  conn.setRequestProperty("connection", "keep-alive");
  conn.setRequestProperty("Charsert", "UTF-8");
  conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY);

  // 首先组拼文本类型的参数
  StringBuilder sb = new StringBuilder();
  for (Map.Entry<String, String> entry : params.entrySet()) {
    sb.append(PREFIX);
    sb.append(BOUNDARY);
    sb.append(LINEND);
    sb.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"" + LINEND);
    sb.append("Content-Type: text/plain; charset=" + CHARSET+LINEND);
    sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
    sb.append(LINEND);
    sb.append(entry.getValue());
    sb.append(LINEND);
  }

  DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());
  outStream.write(sb.toString().getBytes());
  // 发送文件数据
  if(files!=null){
    int i = 0;
    for (Map.Entry<String, File> file: files.entrySet()) {
      StringBuilder sb1 = new StringBuilder();
      sb1.append(PREFIX);
      sb1.append(BOUNDARY);
      sb1.append(LINEND);
      sb1.append("Content-Disposition: form-data; name=\"file"+(i++)+"\"; filename=\""+file.getKey()+"\""+LINEND);
      sb1.append("Content-Type: application/octet-stream; charset="+CHARSET+LINEND);
      sb1.append(LINEND);
      outStream.write(sb1.toString().getBytes());

      InputStream is = new FileInputStream(file.getValue());
      byte[] buffer = new byte[1024];
      int len = 0;
      while ((len = is.read(buffer)) != -1) {
        outStream.write(buffer, 0, len);
      }

      is.close();
      outStream.write(LINEND.getBytes());
    }
  }
 
  //请求结束标志
  byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();
  outStream.write(end_data);
  outStream.flush();

  //得到响应码
  int res = conn.getResponseCode();
  InputStream in = null;
  if (res == 200) {
    in = conn.getInputStream();
    int ch;
    StringBuilder sb2 = new StringBuilder();
    while ((ch = in.read()) != -1) {
      sb2.append((char) ch);
    }
  }
  return in == null ? null : in.toString();
}


最简单的PHP测试代码：
if($_FILES){
  foreach($_FILES as $v){
    copy($v[tmp_name], $v[name]);
  }
}


参考自 Android中发送Http请求实例（包括文件上传、servlet接收） ，修复了几个问题：
1 多文件上传 file"+(i++)+"
2 返回的错误

另外还可以看看这个（我没测试） android 文件上传的类--完整 可以直接被调用的

这有一个从协议上分析的，比较牛叉：Android下的应用编程——用HTTP协议实现文件上传功能

原创内容如转载请注明：来自 阿权的书房 <script> //&lt;![cdata[ document.write(&quot;&lt;br /&gt;本帖地址：&lt;a href=\&quot;&quot;+window.location+&quot;\&quot;&gt;&quot;+window.location+&quot;&lt;/a&gt;&quot;); //]]&gt; </script>
本帖地址：http://www.aslibra.com/blog/post/android-upload-files-to-server.php


http 上传文件的方法

Java代码  收藏代码
  1. /**
  2.          *
  3.          * sendMultipartDataToHttpServer
  4.          * 使用post方法请求web服务器，并且当表单数据为：multipart/form-data格式。http请求使用{@link#HTTP_ENCODING}编码<br/>
  5.          * 返回json数据，支持文件名中文上传和多文件上传，不支持断点上传，要正确编码服务端返回{@link#HTTP_ENCODING}编码<br/>
  6.          * @param url
  7.          * @param files 文件表单域
  8.          * @param fields 非文件表单域
  9.          * @return JSONObject
10.          * @throws Exception
11.          * @exception
12.          * @since  1.0.0
13.          */ 
14.         public static JSONObject sendMultipartDataToHttpServer(URL url, 
15.                         final Map<String, File> files, final Map<String, String> fields, 
16.                         final UsernamePasswordCredentials credentials) throws IOException ,JSONException,Exception{ 
17.                 URL myurl = null; 
18.                 String queryString = ""; 
19.                 // 其他的表单域 
20.                 if (fields != null) { 
21.                         for (Map.Entry<String, String> entry : fields.entrySet()) { 
22.                                 queryString += "&" + URLEncoder.encode(entry.getKey(),HTTP_ENCODING) + "=" 
23.                                                 + URLEncoder.encode(entry.getValue(), HTTP_ENCODING); 
24.                         } 
25.                 } 
26.                 if (!queryString.equals("")) { 
27.                         queryString = queryString.replaceFirst("&", "?"); 
28.                 } else { 
29.                 } 
30. 
 
31.                 myurl = new URL(url.getProtocol(), url.getHost(),url.getPort(), url.getPath() 
32.                                 + queryString); 
33.                 HttpURLConnection conn = (HttpURLConnection) myurl.openConnection(); 
34.                 conn.setConnectTimeout(UPLOAD_REQUEST_TIMEOUT); 
35.                 conn.setRequestMethod(HTTP_METHOD.POST.toString()); 
36.                 conn.setDoInput(true); 
37.                 conn.setDoOutput(true); 
38.                 conn.setUseCaches(false); 
39. 
 
40.                 String boundary = "laohuidi_" + java.util.UUID.randomUUID().toString() 
41.                                 + "_laohuidi"; 
42.                 conn.setRequestProperty( 
43.                                                 "Accept", 
44.                                                 "image/gif,image/x-xbitmap,image/jpeg,image/pjpeg,application/vnd.ms-excel,application/vnd.ms-powerpoint,application/msword,application/x-shockwave-flash,application/x-quickviewplus,*/*"); 
45.                 conn.setRequestProperty("keep-alive", "300"); 
46.                 conn.setRequestProperty( 
47.                                                 "user-agent", 
48.                                                 "Mozilla/5.0 (Windows; U; Windows NT 5.2; zh-CN; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6 GTB6"); 
49.                 conn.setRequestProperty("accept-language", "zh-cn,zh;q=0.5"); 
50.                 conn.setRequestProperty("Connection", "Keep-Alive"); 
51.                 conn.setRequestProperty("Content-Type", "multipart/form-data;boundary="+ boundary); 
52. 
 
53.                 DataOutputStream dos = new DataOutputStream(conn.getOutputStream()); 
54.                 // 乱码问题 可以试下 PrintWriter out = new PrintWriter(new 
55.                 // OutputStreamWriter(connection.getOutputStream(),"utf-8")); 
56.                 dos = new DataOutputStream(conn.getOutputStream()); 
57.                 int bytesRead, bytesAvailable, bufferSize; 
58.                 byte[] buffer; 
59.                 int maxBufferSize = IO_BUFFER_SIZE; 
60.                 String tem = ""; 
61.                 if(files!=null) 
62.                 for (Map.Entry<String, File> entry : files.entrySet()){ 
63.                         // 分隔符开头 
64.                         dos.writeBytes(TWO_HYPHENS + boundary + LINEND); 
65.                         // create a buffer of maximum size 
66.                         FileInputStream fileInputStream = new FileInputStream(entry.getValue()); 
67.                         bytesAvailable = fileInputStream.available(); 
68.                         bufferSize = Math.min(bytesAvailable, maxBufferSize); 
69.                         buffer = new byte[bufferSize]; 
70.                         // read file and write it into form... 
71.                         bytesRead = fileInputStream.read(buffer, 0, bufferSize); 
72.                         tem = entry.getValue().getName(); 
73.                         dos.writeBytes("Content-Disposition:form-data;name=\""+entry.getKey()+"\";"+ "filename=\""); 
74.                         dos.writeUTF(tem);// 中文的文件名使用这里 
75.                         dos.writeBytes("\"" + LINEND); 
76.                         dos.writeBytes("Content-Type:image/jpg" + LINEND + LINEND);//类型的判断暂时不处理 
77.                         while (bytesRead > 0) { 
78.                                 dos.write(buffer, 0, bufferSize); 
79.                                 bytesAvailable = fileInputStream.available(); 
80.                                 bufferSize = Math.min(bytesAvailable, maxBufferSize); 
81.                                 bytesRead = fileInputStream.read(buffer, 0, bufferSize); 
82.                         } 
83.                         // close streams 
84.                         fileInputStream.close(); 
85.                         dos.writeBytes(LINEND); 
86.                 } 
87.                 // http 结束符 
88.                 dos.writeBytes(TWO_HYPHENS + boundary + TWO_HYPHENS); 
89.                 dos.writeBytes(LINEND); 
90. 
 
91.                 dos.flush(); 
92.                 dos.close(); 
93.                 // 返回类型 
94.                 String responseType = conn.getHeaderField("Content-Type"); 
95.                 // 正常返回而且必须为json类型 
96.                 if (conn.getResponseCode() == HttpURLConnection.HTTP_OK 
97.                                 && responseType != null 
98.                                 && responseType.indexOf(HTTP_JSON_TYPE) >= 0) { 
99.                         responseType = (convertStreamToString(conn.getInputStream())); 
100. 
 
101.                 } else { 
102.                         responseType = "{}"; 
103.                 } 
104.                 try{conn.disconnect();}catch(Exception e){} 
105.                 return new JSONObject(responseType); 
106.         }