httpclient 之get方法（无参和有参）

httplient 执行接口测试，采用maven项目，pom.xml文件配置如下：

<?xml version="1.0" encoding="UTF-8"?>
<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>httpclient</groupId>
    <artifactId>httpclient</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.3.6</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient-cache</artifactId>
            <version>4.3.6</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpmime</artifactId>
            <version>4.3.6</version>
        </dependency>

        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20140107</version>
        </dependency>
    </dependencies>


</project>

httpclient 之get方法（无参和有参）

package httpclient;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.http.*;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.config.RequestConfig;
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.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import org.json.JSONObject;
/**
 * Created by jiangcui on 2018/5/18.
 */
public class HttpclientGet {
    public static void main(String[] args) {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        //String html = "";
        String url1 = "http://www.baidu.com";
        String url2 = "http://www.sina.com";

        //发送get请求
        HttpGet httpGet = new HttpGet(url1);

        //设置了header 的参数，如果不需要，可以省略
        HashMap<String, String> headers = new HashMap<String, String>();
        headers.put("Accept", "*/*");
        headers.put("Accept-Encoding", "gzip, deflate, sdch");
        headers.put("Accept-Language", "zh-CN,zh;q=0.8");

        for (Map.Entry m : headers.entrySet()) {
            System.out.println(m.getKey() + "	" + m.getValue());
            httpGet.setHeader(m.getKey().toString(), m.getValue().toString());
        }
        //配置请求超时设置
        RequestConfig requestConfig = RequestConfig.custom()
                .setConnectTimeout(5000) //设置连接超时时间
                .setConnectionRequestTimeout(5000) //  设置连接请求超时时间
                .setSocketTimeout(5000)
                .setRedirectsEnabled(true) //设置自动允许重定向
                .build();
        httpGet.setConfig(requestConfig);

        //获取 response内容
        try {
            CloseableHttpResponse closeableHttpResponse = httpClient.execute(httpGet);
            //获取响应状态码
            int statusCode = closeableHttpResponse.getStatusLine().getStatusCode();
            System.out.println(statusCode);

            if (closeableHttpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                HttpEntity httpEntity = closeableHttpResponse.getEntity();
                String strResult = EntityUtils.toString(httpEntity);
                System.out.println(strResult);
                // 把字符串转换为json对象
                JSONObject jsonObject = new JSONObject(strResult);
                System.out.println(jsonObject);
            } else {
                String strResult = "Error Response: " + closeableHttpResponse.getStatusLine().toString();
                System.out.println(strResult);
            }

        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (ParseException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

            //CloseableHttpClient httpClient2 = HttpClients.createDefault();

            //封装参数，get方法传递参数
            List<NameValuePair> param = new ArrayList<NameValuePair>();
            param.add(new BasicNameValuePair("username", "jiangcui"));
            param.add(new BasicNameValuePair("password", "pdmi1234"));

            try {
                UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(param, "utf-8");
                String str = EntityUtils.toString(urlEncodedFormEntity);
                System.out.println(str);
            }catch(IOException e){
                e.printStackTrace();
            }
        }

        try{
                //创建httpGet请求
                HttpGet httpGet2 = new HttpGet(url2);

                //执行httpGet请求
                CloseableHttpResponse closeableHttpResponse1 = httpClient.execute(httpGet2);
                int statusCode = closeableHttpResponse1.getStatusLine().getStatusCode();
                System.out.println(statusCode);


                if (closeableHttpResponse1.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                    HttpEntity httpEntity1 = closeableHttpResponse1.getEntity();
                    String strResult1 = EntityUtils.toString(httpEntity1);
                    System.out.println(strResult1);
                    // 把字符串转换为json对象
                    JSONObject jsonObject = new JSONObject(strResult1);
                    //获取json串中的数据
                    //String str = jsonObject.get("name").toString;

                    //将json对象转化为字符串
                    String jsonToString = jsonObject.toString();
                    System.out.println(jsonToString);
                } else {
                    String strResult = "Error Response: " + closeableHttpResponse1.getStatusLine().toString();
                    System.out.println(strResult);
                }
            }catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (ParseException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    httpClient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }