javahttp请求

package com.expai.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.util.Map;
import java.util.Map.Entry;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Description:后台服务要调用其他架构服务post请求服务类
 */
public class HttpPostUtils {
	
	private static Logger logger = LoggerFactory.getLogger(HttpPostUtils.class);
	
	/**
	 * 发送请求
	 * @param url
	 * @param params
	 * @return
	 */
	public static String sendPost(String url,Map<String,String> params){
		
		logger.debug("sendPost======================开始===========");
		URL u = null;
		HttpURLConnection con = null;
		//构建请求参数
		StringBuffer sb = new StringBuffer();
		if(params != null){
			for(Entry<String,String>e:params.entrySet()){
				sb.append(e.getKey());
				sb.append("=");
				sb.append(e.getValue());
				sb.append("&");
			}
			sb.substring(0, sb.length()-1);
		}
		logger.debug("send_url:"+url);
		logger.debug("send_data:"+sb.toString());
		//发送请求
		try {
			u = new URL(url);
			con = (HttpURLConnection)u.openConnection();
			con.setRequestMethod("GET");
			con.setDoInput(true);
			con.setDoOutput(true);
			con.setUseCaches(false);
			con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
			OutputStreamWriter osw = new OutputStreamWriter(con.getOutputStream(), "UTF-8");
			osw.write(sb.toString());
			osw.flush();
			osw.close();
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (ProtocolException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}finally{
			if(con!=null){
				con.disconnect();
			}
		}
		
		//读取返回的参数
		StringBuffer buffer = new StringBuffer();
		try {
			BufferedReader br = new BufferedReader(new InputStreamReader(
					con.getInputStream(), "UTF-8"));
			String temp;
			while ((temp = br.readLine()) != null) {
				buffer.append(temp);
				buffer.append("\n");
			}
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		return buffer.toString();
		
	}
	
}