目标：使用apache公司的产品http httpcomponents 完成服务调用。

HTTPClient调用服务

4：导入httpclient的依赖配置

org.apache.httpcomponentshttpclient4.5.2commons-loggingcommons-logging1.1.3

3：编写测试类

package com.icoding.client;

import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.BasicResponseHandler;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.junit.Test;

//使用httpclient完成服务编排public class HttpClientDemo {

    // 1: 创建httpclient工具类，用于发送不同的请求    private CloseableHttpClient httpClient = HttpClients.createDefault();

    @Test    public void testHttpClient() throws  Exception{        // 请求地址        String url = "http://localhost:8088/user/get/1";

        // 2: 创建get请求        HttpGet httpGet = new HttpGet(url);        // 3: 发送请求，        // 参数1：需要发送的请求 ，参数二：相应的内容 BasicResponseHandler,把响应的正文内容获取，返回字符串数据        String result = httpClient.execute(httpGet, new BasicResponseHandler());

        System.out.println(result);    }

}

打印结果如下：

{"id":1,"userName":"zhangsan","password":"123456","name":"张三","age":30,"sex":1,"birthday":"1964-08-07T16:00:00.000+0000","created":"2014-09-19T08:56:04.000+0000","updated":"2014-09-21T03:24:59.000+0000","note":"张三同学在学Java"}

4：如果你想把json字符串转成对象，可以导入jackson将字符串json转成对象 ,

com.fasterxml.jackson.corejackson-core2.9.6

com.fasterxml.jackson.corejackson-databind2.9.6

==注：当然springboot-web-stater包已经包含了jackson这个依赖，所以也可以不用引入上面的依赖也可以。==

在HttpClientDemo.java中增加如下代码：

package com.icoding.springboothttpclient.http;

import com.fasterxml.jackson.databind.ObjectMapper;import com.icoding.springboothttpclient.pojo.User;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.BasicResponseHandler;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;

public class HttpClientDemo {

    // 发起请求的工具类    private static CloseableHttpClient closeableHttpClient = HttpClients.createDefault();

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

        // 请求地址        String url = "http://localhost:8089/getuser/1";

        // 2: 创建get请求        HttpGet httpGet = new HttpGet(url);

        // 3: 发送请求，        String result = closeableHttpClient.execute(httpGet, new BasicResponseHandler());        // 参数1：需要发送的请求 ，参数二：相应的内容 BasicResponseHandler,把响应的正文内容获取，返回字符串数据

        //  将json字符串转换成对象        ObjectMapper objectMapper = new ObjectMapper();        User user = objectMapper.readValue(result, User.class);

        System.out.println(result);        System.out.println(user);

    }

}

结果如下：

User(id=1, userName=zhangsan, password=123456, name=张三, age=30, sex=1, birthday=Sat Aug 08 00:00:00 CST 1964, created=Fri Sep 19 16:56:04 CST 2014, updated=Sun Sep 21 11:24:59 CST 2014, note=张三同学在学Java)

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