springboot使用RestTemplate调用第三方接口

一.pom文件使用RestTemplate需要引入依赖

   org.apache.httpcomponents
   httpclient
   4.5.2

二.实例化该类的一个实例

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;

@Configuration
public class RestTempleConfig {
    // 启动的时候要注意，由于我们在controller中注入了RestTemplate，所以启动的时候需要实例化该类的一个实例
    @Autowired
    private RestTemplateBuilder builder;
    // 使用RestTemplateBuilder来实例化RestTemplate对象，spring默认已经注入了RestTemplateBuilder实例
    @Bean
    public RestTemplate restTemplate() {
        return builder.build();
    }
    @Bean
    public RestTemplate customRestTemplate() {
        HttpComponentsClientHttpRequestFactory httpRequestFactory = new HttpComponentsClientHttpRequestFactory();
        httpRequestFactory.setConnectionRequestTimeout(3000);
        httpRequestFactory.setConnectTimeout(3000);
        httpRequestFactory.setReadTimeout(3000);
        return new RestTemplate(httpRequestFactory);
    }
}

三.调用第三方http接口

import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.web.client.RestTemplate;
import org.springframework.beans.factory.annotation.Autowired;

@Configuration
@EnableScheduling
public class TestTask {
    @Autowired
    private RestTemplate restTemplate;
    public void test() {
	   
	    JSONObject json = new JSONObject();
	    json.put("id", "id");
	    //如果默认不进行处理的话这里返回的是List> 格式的数据并不是我们需要的;
	    Map result = restTemplate.postForObject("http://127.0.0.1/test", json,Map.class);
    }
}

四.调用第三方https接口

import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.web.client.RestTemplate;
import org.springframework.beans.factory.annotation.Autowired;

@RestController
@RequestMapping("test")
public class Test {
    @Autowired
    private RestTemplate restTemplate;
    public void test() {
	   
	   RestTemplate restTemplate = new RestTemplate(new HttpsClientRequestFactory());
       String url = "https://api.weixin.qq.com";
       ResponseEntity res = restTemplate .getForEntity(url, String.class);
       JSONObject jsonObject = JSONObject.parseObject(res.getBody());
    }
}

import org.apache.http.conn.ssl.SSLContexts;
import org.apache.http.conn.ssl.TrustStrategy;
import org.springframework.http.client.SimpleClientHttpRequestFactory;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import java.net.HttpURLConnection;
import java.security.KeyStore;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;


/**
 * @description:
 * @author: bgq
 * @create: 2021/3/22 17:14
 */
public class HttpsClientRequestFactory  extends SimpleClientHttpRequestFactory {
    @Override
    protected void prepareConnection(HttpURLConnection connection, String httpMethod) {
        try {
            if (!(connection instanceof HttpsURLConnection)) {// http协议
                // throw new RuntimeException("An instance of HttpsURLConnection is expected");
                super.prepareConnection(connection, httpMethod);
            }
            if (connection instanceof HttpsURLConnection) {// https协议，修改协议版本
                KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
                // 信任任何链接
                TrustStrategy anyTrustStrategy = new TrustStrategy() {
                    @Override
                    public boolean isTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
                        return true;
                    }
                };
                SSLContext ctx = SSLContexts.custom().useTLS().loadTrustMaterial(trustStore, anyTrustStrategy).build();
                ((HttpsURLConnection)connection).setSSLSocketFactory(ctx.getSocketFactory());
                HttpsURLConnection httpsConnection = (HttpsURLConnection)connection;
                super.prepareConnection(httpsConnection, httpMethod);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}