android中模拟http协议表单下传

package com.android.cist.network.form;import java.io.DataOutputStream;import java.io.InputStream;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLEncoder;import java.util.Iterator;import java.util.Map;import java.util.Set;public class HttpFormUtil {	public static String post(String actionUrl, Map<String, String> params,FormFile[] files) {		try {			String enterNewline = "\r\n";			String fix="--";			String boundary="######";			String MULTIPART_FORM_DATA = "multipart/form-data";						URL url = new URL(actionUrl);						HttpURLConnection con = (HttpURLConnection)url.openConnection();			con.setDoInput(true);			con.setDoOutput(true);			con.setUseCaches(false);			con.setRequestMethod("POST");			con.setRequestProperty("Connection", "Keep-Alive");			con.setRequestProperty("Accept", "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/msword, application/vnd.ms-excel, application/vnd.ms-powerpoint, */*");			con.setRequestProperty("Accept-Encoding", "gzip, deflate");			con.setRequestProperty("Charset", "UTF-8");			con.setRequestProperty("Content-Type", MULTIPART_FORM_DATA+ ";boundary=" + boundary);						DataOutputStream ds = new DataOutputStream(con.getOutputStream());			Set<String> keySet = params.keySet();			Iterator<String> it = keySet.iterator();						while(it.hasNext()){				String key = it.next();				String value = params.get(key);				ds.writeBytes(fix+boundary+enterNewline);				ds.writeBytes("Content-Disposition: form-data; "+"name=\"" + key + "\"" + enterNewline);				ds.writeBytes(enterNewline);				//ds.write(value.getBytes("UTF-8"));				ds.writeBytes(value);//如果有中文乱码，保存改用上面的ds.writeBytes(enterNewline);那句代码				ds.writeBytes(enterNewline);			}						if(files!=null&&files.length>0){				ds.writeBytes(fix+boundary+enterNewline);				ds.writeBytes("Content-Disposition: form-data; "+"name=\"" + files[0].getFormname() + "\"" +"; filename=\""+files[0].getFilname()+"\""+enterNewline);				ds.writeBytes(enterNewline);				ds.write(files[0].getData());				ds.writeBytes(enterNewline);			}						ds.writeBytes(fix+boundary+fix+enterNewline);			ds.flush();						InputStream is = con.getInputStream();			int ch;			StringBuffer b = new StringBuffer();						while((ch = is.read()) != -1){				b.append((char)ch);			}			ds.close();						return b.toString().trim();					} catch (Exception e) {			throw new RuntimeException(e);		}	}		public static String encode(String url) {           try {               return URLEncoder.encode(url, "UTF-8");           } catch (UnsupportedEncodingException ex) {               return url;           }       }   }