第一步:新建marven项目,并配置marven

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.sunjian</groupId>
  <artifactId>httpclientsutil</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <dependencies>
         <dependency>
             <groupId>org.apache.httpcomponents</groupId>
             <artifactId>httpclient</artifactId>
             <version>4.3.5</version>
         </dependency>
  </dependencies>
</project>

第二步:编写HttpClientUtils,并进行代码测试

httpclient的get请求

package com.sunjian;
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
public class HttpClientUtils {
    public static void main(String[] args) throws ClientProtocolException, IOException {
         get("http://www.jianshu.com/");
    }
    static public void  get(String url) throws ClientProtocolException, IOException{
         //创建一个默认连接
         CloseableHttpClient httpClient = HttpClients.createDefault();
         HttpGet httpGet = new HttpGet(url);
         CloseableHttpResponse response = httpClient.execute(httpGet);
         //获取状态吗，判断状态
         int statusCode = response.getStatusLine().getStatusCode();
         if(statusCode==200){
             HttpEntity entity = response.getEntity();
             String result = EntityUtils.toString(entity,"UTF-8");
             System.out.println("result:"+result);
         }
    }
}

httpclient的post请求

static public void post(String url) throws ClientProtocolException, IOException{
        //创建一个默认连接
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(url);
        httpPost.setHeader("token","644064");
        List<NameValuePair> listNameValuePair = new ArrayList<NameValuePair>();
        listNameValuePair.add(new BasicNameValuePair("userName", "123456"));
        listNameValuePair.add(new BasicNameValuePair("pwd", "646525"));
        UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(listNameValuePair,"UTF-8");
        httpPost.setEntity(urlEncodedFormEntity);
        CloseableHttpResponse response = httpClient.execute(httpPost);
        //获取状态码
        int statusCode = response.getStatusLine().getStatusCode();
        if(statusCode == 200){
            HttpEntity entity = response.getEntity();
            String result = EntityUtils.toString(entity,"UTF-8");
            System.out.println("result:"+result);
        }
    }

测试效果:

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