android上傳文件到服務器

package com.itrackstar.tcube.common;     import java.io.DataOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.util.ArrayList; import java.util.Map; import java.util.UUID;         import android.util.Log;     public class PostFile { private static final String TAG = "uploadFile";     private static final int TIME_OUT = 10 * 1000; // 超時時間     private static final String CHARSET = "utf-8"; // 設置編碼         /** *  * android上傳文件到服務器 *  * @param file *            需要上傳的文件 *  * @param RequestURL *            請求的rul *  * @return 返回響應的內容 */     public static String uploadFile(File file, Map<String, String> params, String RequestURL)     { String result = null; String BOUNDARY = UUID.randomUUID().toString(); // 邊界標識 隨機生成 String PREFIX = "--", LINE_END = "\r\n"; String CONTENT_TYPE = "multipart/form-data"; // 內容類型 try { URL url = new URL( RequestURL ); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setReadTimeout( TIME_OUT ); conn.setConnectTimeout( TIME_OUT ); conn.setDoInput( true ); // 允許輸入流 conn.setDoOutput( true ); // 允許輸出流 conn.setUseCaches( false ); // 不允許使用緩存 conn.setRequestMethod( "POST" ); // 請求方式 conn.setRequestProperty( "Charset", CHARSET ); // 設置編碼 conn.setRequestProperty( "connection", "keep-alive" ); conn.setRequestProperty( "Content-Type", CONTENT_TYPE + ";boundary=" + BOUNDARY );     DataOutputStream dos = new DataOutputStream( conn.getOutputStream() );     if (file != null) { /** *  * 當文件不為空，把文件包裝並且上傳 */ InputStream is = new FileInputStream( file );     byte[] bytes = new byte[1024];     int len = 0;     while ((len = is.read( bytes )) != -1) { dos.write( bytes, 0, len ); Log.i( "bytetag", bytes.toString() ); } is.close();     StringBuilder sbs = new StringBuilder(); //上傳的表單參數部分，格式請參考文章   for ( Map.Entry<String, String> entry : params.entrySet() ) {//構建表單字段內容   sbs.append( PREFIX ); sbs.append( BOUNDARY ); sbs.append( LINE_END ); sbs.append( "Content-Disposition: form-data; name=\"" + entry.getKey() + "\"" + LINE_END + LINE_END ); sbs.append( entry.getValue() ); sbs.append( LINE_END ); } sbs.append( PREFIX ); sbs.append( BOUNDARY ); sbs.append( LINE_END ); sbs.append( "Content-Disposition: form-data; name=\"filelength\"" + LINE_END + LINE_END ); sbs.append( file.length() ); sbs.append( LINE_END );     dos.write( sbs.toString().getBytes() );//發送表單字段數據     dos.write( LINE_END.getBytes() );     byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINE_END).getBytes();     dos.write( end_data );     dos.flush();     /** *  * 獲取響應碼 200=成功 *  * 當響應成功，獲取響應的流 */     int res = conn.getResponseCode();     Log.i( TAG, "response code:" + res );     if (res == 200)     { Log.e( TAG, "request success" ); InputStream input = conn.getInputStream();     int total = input.available(); byte[] bs = new byte[total]; input.read( bs );     result = new String( bs, "GBK" ); Log.i( TAG, "result : " + result ); } else { Log.i( TAG, "request error" ); } } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return result; } }