<dependency>

    <groupId>org.apache.httpcomponents</groupId>

    <artifactId>httpclient</artifactId>

    <version>4.5.3</version>

</dependency>

package com.midea.clean.util;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

import java.util.Set;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.NameValuePair;

import org.apache.http.ParseException;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.entity.UrlEncodedFormEntity;

import org.apache.http.client.methods.CloseableHttpResponse;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.client.methods.HttpUriRequest;

import org.apache.http.entity.StringEntity;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.impl.client.HttpClients;

import org.apache.http.message.BasicNameValuePair;

import org.apache.http.protocol.HTTP;

import org.apache.http.util.EntityUtils;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import com.alibaba.fastjson.JSONObject;

import com.midea.clean.bo.UserBo;

public class HttpClient {

	private static final Logger LOGGER = LoggerFactory.getLogger(HttpClient.class); 

	/**

	 * 发送post请求

	 * @param url

	 * @param params

	 * @return

	 */

	public static String post(String url, Map<String, String> params) {

		DefaultHttpClient httpclient = new DefaultHttpClient();

		String body = null;

		HttpPost post = postForm(url, params);

		body = invoke(httpclient, post);

		httpclient.getConnectionManager().shutdown();

		return body;

	}

	/**

	 * 发送get请求

	 * @param url

	 * @return

	 */

	public static String get(String url) {

		DefaultHttpClient httpclient = new DefaultHttpClient();

		String body = null;

		HttpGet get = new HttpGet(url);

		body = invoke(httpclient, get);

		httpclient.getConnectionManager().shutdown();

		return body;

	}

	private static String invoke(DefaultHttpClient httpclient, HttpUriRequest httpost) {

		HttpResponse response = sendRequest(httpclient, httpost);

		String body = paseResponse(response);

		return body;

	}

	private static String paseResponse(HttpResponse response) {

		HttpEntity entity = response.getEntity();

		String charset = EntityUtils.getContentCharSet(entity);

		String body = null;

		try {

			body = EntityUtils.toString(entity);

		} catch (ParseException e) {

			e.printStackTrace();

		} catch (IOException e) {

			e.printStackTrace();

		}

		return body;

	}

	private static HttpResponse sendRequest(DefaultHttpClient httpclient, HttpUriRequest httpost) {

		HttpResponse response = null;

		try {

			response = httpclient.execute(httpost);

		} catch (ClientProtocolException e) {

			e.printStackTrace();

		} catch (IOException e) {

			e.printStackTrace();

		}

		return response;

	}

	private static HttpPost postForm(String url, Map<String, String> params) {

		HttpPost httpost = new HttpPost(url);

		List<NameValuePair> nvps = new ArrayList<NameValuePair>();

		// 需要传一个token

		//httpost.setHeader("token", "c7a4e021-6527-11e6-96be-fcaa14c3021a1");

		Set<String> keySet = params.keySet();

		for (String key : keySet) {

			nvps.add(new BasicNameValuePair(key, params.get(key)));

		}

		try {

			httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));

		} catch (UnsupportedEncodingException e) {

			e.printStackTrace();

		}

		return httpost;

	}

	 /**

     * post方式提交json代码

     * @throws Exception

     */

    public static String postJson(String url,String json) throws Exception{

        //创建默认的httpClient实例.

        CloseableHttpClient httpclient = null;

        //接收响应结果

        CloseableHttpResponse response = null;

        String result = "";

        //创建httppost

        httpclient = HttpClients.createDefault();

        HttpPost httpPost = new HttpPost(url);

        httpPost.addHeader(HTTP.CONTENT_TYPE,"application/json");

        //参数

        StringEntity se = new StringEntity(json);

        se.setContentEncoding("UTF-8");

        se.setContentType("application/json");//发送json需要设置contentType

        httpPost.setEntity(se);

        LOGGER.debug("http post url:{},json:{}",url,json);

        response = httpclient.execute(httpPost);

        LOGGER.debug("http post result:{}", response);

        //解析返结果

        HttpEntity entity = response.getEntity();

        if(entity != null){

        	result = EntityUtils.toString(entity, "UTF-8");

        }

        httpclient.close();

        response.close();

        return result;

    }  

	public static void main(String[] args) throws Exception {

//		HttpClient.get("http://localhost/clean/4a/welcome");

//		Map<String,String> params = new HashMap<String,String>();

//		params.put("empName", "1");

//		params.put("empCode", "2");

//		HttpClient.post("http://localhost/clean/4a/privilege/check", params);

		UserBo userBo = new UserBo();

    	userBo.setEmpCode("3");

    	userBo.setEmpName("zs");

    	userBo.setErpUid("4");

    	userBo.setMip("5");

    	String jsonStr = JSONObject.toJSONString(userBo);

		HttpClient.postJson("http://localhost/clean/4a/privilege/check", jsonStr);

	}

}