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如何用spring-boot集成httpClient实现远程调用？这篇文章运用了实例代码展示，代码非常详细，可供感兴趣的小伙伴们参考借鉴，希望对大家有所帮助。
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引入相关依赖：
org.apache.httpcomponents
httpclient
4.5.9
com.alibaba
fastjson
1.2.47
org.springframework.boot
spring-boot-configuration-processor
true
创建HttpClientUtil工具类，代码如下：
package com.test.demo;
import com.alibaba.fastjson.JSON;
import com.test.demo.model.User;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
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.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.List;
/**
* ClassName: HttpClientTest
* Package: com.test.demo
* Description: httpClient方法封装
* Datetime: 2020/1/13 10:45
* Author: zhoukaishun
*/
@Component
public class HttpClientUtil {
@Autowired
private HttpClientConfigure httpClientConfigure;
/**
* @description GET封装
* @author zhoukaishun
* @date 2020/1/13 13:12
*/
public void doGetHttp(List params,Boolean haveParams) {
// 获得Http客户端
CloseableHttpClient httpClient = HttpClientBuilder.create().build();
// 参数
URI uri = null;
try {
// 设置uri信息,并将参数集合放入uri;
if(haveParams){//有参调用
uri = new URIBuilder().setScheme(httpClientConfigure.getScheme()).setHost(httpClientConfigure.getHost())
.setPort(httpClientConfigure.getPort()).setPath(httpClientConfigure.getMapPath().get("interface2"))
.setParameters(params).build();
}else{//无参调用
uri = new URIBuilder().setScheme(httpClientConfigure.getScheme()).setHost(httpClientConfigure.getHost())
.setPort(httpClientConfigure.getPort()).setPath(httpClientConfigure.getMapPath().get("interface1"))
.build();
}
} catch (URISyntaxException e1) {
e1.printStackTrace();
}
// 创建Get请求
HttpGet httpGet = new HttpGet(uri);
// 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());
System.out.println("响应内容为:" + 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();
}
}
}
/**
* @description POST封装
* @author zhoukaishun
* @date 2020/1/13 14:01
*/
public void doPostHttp(User user,Boolean haveParam) {
// 获得Http客户端
CloseableHttpClient httpClient = HttpClientBuilder.create().build();
URI uri = null;
try {
// 设置uri信息,并将参数集合放入uri;
uri = new URIBuilder().setScheme(httpClientConfigure.getScheme()).setHost(httpClientConfigure.getHost())
.setPort(httpClientConfigure.getPort())
.setPath(haveParam?httpClientConfigure.getMapPath().get("interface4"):httpClientConfigure.getMapPath().get("interface3"))
.build();
} catch (URISyntaxException e1) {
e1.printStackTrace();
}
// 创建Post请求
HttpPost httpPost = new HttpPost(uri);
if(haveParam){
//入参
// 利用阿里的fastjson，将Object转换为json字符串;
// (需要导入com.alibaba.fastjson.JSON包)
String jsonString = JSON.toJSONString(user);
StringEntity entity = new StringEntity(jsonString, "UTF-8");
// post请求是将参数放在请求体里面传过去的;这里将entity放入post请求体中
httpPost.setEntity(entity);
httpPost.setHeader("Content-Type", "application/json;charset=utf8");
}
// 响应模型
CloseableHttpResponse response = null;
try {
// 由客户端执行(发送)Post请求
response = httpClient.execute(httpPost);
// 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());
System.out.println("响应内容为:" + EntityUtils.toString(responseEntity));
}郑州妇科医院哪家好 https://yiyuan.120ask.com/zzfck/
} 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();
}
}
}
}
其中大部分代码基本不变，只有对url的拼接做了一些处理，可以看到我们注入了一个HttpClientConfigure实例，因为我们需要访问的路径情况有很多种，但是我们不可能每次都去改util下的url拼接代码，所以引入一个HttpClientConfigure，这是我自定义的一个类，用于存储我们拼接url可能遇到的情况。代码如下：
package com.test.demo;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import java.util.HashMap;
import java.util.Map;
/**
* ClassName: HttpClientConfigure
* Package: com.test.demo
* Description: 接收配置信息
* Datetime: 2020/1/13 14:41
* Author: zhoukaishun
*/
@Component
@ConfigurationProperties(prefix="httpclientconfigure")
@Data
public class HttpClientConfigure {
private Map mapPath = new HashMap<>();
private String scheme;
private String host;
private Integer port;
}
其中的@ConfigurationProperties注解 前面提到过，在pom中，其中属性值配置在yml文件中，如下(具体内容根据自己的需求来定)：
到这里就可以开始测试了，可以在本地启动两个服务(一个服务也行)，根据自己controller里面的访问路径配置httpclientconfigure,然后直接调用自己controller里方法即可。
以我的demo为例，调用者controller代码如下：
@GetMapping
@RequestMapping("/doGetHaveNoParam")
public void doGetHaveNoParam(){
httpClientUtil.doGetHttp(null,false);
}
@GetMapping
@RequestMapping("/doGetHaveParam")
public void doGetHaveParam(){
System.out.println("调用有参Get请求，当前时间："+System.currentTimeMillis());
List params = new ArrayList<>();
params.add(new BasicNameValuePair("name", "&"));
params.add(new BasicNameValuePair("age", "22"));
httpClientUtil.doGetHttp(params,true);
}
@PostMapping
@RequestMapping("/doPostHaveNoParam")
public void doPostHaveNoParam(){
httpClientUtil.doPostHttp(null,false);
}
@PostMapping
@RequestMapping("/doPostHaveParam")
public void doPostHaveParam(){
httpClientUtil.doPostHttp(new User("name",11),true);
}
被调用者controller代码如下：
@RequestMapping("/doGetHaveNoParam")
public String doGetHaveNoParam(){
return "doGetHaveNoParam successful";
}
@RequestMapping("/doGetHaveParam")
public List doGetHaveParam(String name,Integer age){
return getUserByAge(name,age);
}
@PostMapping
@RequestMapping("/doPostHaveNoParam")
public String doPostHaveNoParam(){
return "doPostHaveNoParam successful";
}
@PostMapping
@RequestMapping("/doPostHaveParam")
public String doHttpPostParam(@RequestBody User user){
return "do Post params:name="+user.getName()+",age="+user.getAge();
使用postman测试如下：
请求路径分别为：
http://localhost:8081/user/doGetHaveNoParam
http://localhost:8081/user/doGetHaveParam
http://localhost:8081/user/doPostHaveNoParam
http://localhost:8081/user/doPostHaveParam
以上就是用spring-boot集成httpClient实现远程调用的方法，代码详细清楚，如果在日常工作遇到这个问题，希望你能通过这篇文章解决问题。如果想了解更多相关内容，欢迎关注创新互联行业资讯频道！
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