Java下通过发送http post请求的代码详解编程语言

import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 
import java.net.HttpURLConnection; 
import java.net.URL; 
import java.net.URLEncoder; 
import java.util.Map; 
   
import org.apache.http.protocol.HTTP; 
   
import com.everyone.android.callback.ParseCallback; 
import com.everyone.android.callback.ResultCallback; 
   
/** 
 * 功能描述：通过HTTP协议发送POST请求 
 * @author android_ls 
 * 
 */ 
public class AsyncHttpPost extends AsyncBaseRequest { 
   
    /** 
     * 
     */ 
    private static final long serialVersionUID = 3L; 
   
    public AsyncHttpPost(String url, Map<String, String> parameter, 
            ParseCallback handler, ResultCallback requestCallback) { 
        super(url, parameter, handler, requestCallback); 
    } 
   
    @Override 
    protected InputStream getRequestResult() throws IOException { 
        StringBuilder sb = new StringBuilder(); 
        if(parameter!=null && !parameter.isEmpty()){ 
            for(Map.Entry<String, String> entry : parameter.entrySet()){ 
                sb.append(entry.getKey()).append('=') 
                    .append(URLEncoder.encode(entry.getValue(), HTTP.UTF_8)).append('&'); 
            } 
            sb.deleteCharAt(sb.length()-1); 
        } 
           
        // 得到实体的二进制数据 
        byte[] entitydata = sb.toString().getBytes(); 
        URL url = new URL(requestUrl); 
        mHttpURLConn = (HttpURLConnection)url.openConnection(); 
        mHttpURLConn.setRequestMethod("POST"); 
        mHttpURLConn.setConnectTimeout(5 * 1000); 
        // 如果通过post提交数据，必须设置允许对外输出数据 
        mHttpURLConn.setDoOutput(true); 
        mHttpURLConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); 
        mHttpURLConn.setRequestProperty("Content-Length", String.valueOf(entitydata.length)); 
        OutputStream outStream = mHttpURLConn.getOutputStream(); 
        outStream.write(entitydata); 
        outStream.flush(); 
        outStream.close(); 
        if(mHttpURLConn.getResponseCode()== HttpURLConnection.HTTP_OK){ 
            return mHttpURLConn.getInputStream(); 
        } 
        return null; 
    } 
   
}