HttpClientUtils

Httpclient用于多服务器部署，一台服务器宕机，其它服务器仍可以提供配置服务

package com.redxun.apollo;

import org.apache.http.HttpEntity;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.config.RequestConfig;
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.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

import java.io.IOException;

public class HttpClientUtils {
    /**
     * GET(方式一:手动在url后面加上参数)
     */
    public static String doGet(String param) {
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();
        String responseJsonString = null;
        // 创建Get请求
        HttpGet httpGet = new HttpGet("http://172.26.4.35:10086/GetApolloConfig?environment=" + param);
        // 响应模型
        CloseableHttpResponse response = null;
        try {
            // 配置信息
            RequestConfig requestConfig = RequestConfig.custom()
                    // 设置连接超时时间(单位毫秒)
                    .setConnectTimeout(5000)
                    // 设置请求超时时间(单位毫秒)
                    .setConnectionRequestTimeout(5000)
                    // socket读写超时时间(单位毫秒)
                    .setSocketTimeout(5000)
                    // 设置是否允许重定向(默认为true)
                    .setRedirectsEnabled(true).build();

            // 将上面的配置信息 运用到这个Get请求里
            httpGet.setConfig(requestConfig);

            // 由客户端执行(发送)Get请求
            response = httpClient.execute(httpGet);

            // 从响应模型中获取响应实体
            HttpEntity responseEntity = response.getEntity();
            System.out.println("响应状态为:" + response.getStatusLine());
            if (responseEntity != null) {
                System.out.println("响应内容长度为:" + responseEntity.getContentLength());
                responseJsonString = EntityUtils.toString(responseEntity);
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (ParseException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                // 释放资源
                if (httpClient != null) {
                    httpClient.close();
                }
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return responseJsonString;
    }
}