Springboot2.1中使用RestTemplate

Springboot2.1中使用RestTemplate

pom中引用httpclient

	org.apache.httpcomponents
	httpclient
	4.5.3

参数类

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
@Data
@Component("proxyConfig")
@ConfigurationProperties(prefix="rest-poxy",ignoreUnknownFields = false)
public class ProxyConfig {
    //是否启用代理
    private Boolean enabled;
    //代理的主机
    private String host;
    //代理的端口
    private Integer port;
    //连接超时
    private Integer connectTimeout;
    //读取超时
    private Integer readTimeout;
    //认证码
    private String authorizationCode;
    //最大连接数
    private Integer maxTotal;
    //同路由并发数
    private Integer maxPerRoute;
    //重连接次数
    private Integer retryHandler;
    //连接不够用时的等待时间
    private Integer connectionRequestTimeout;

    //请求的前缀
    private String urlPrefix;

    public String getUrlPrefix() {
        return "http://"+ host + ":" + port + "/openapi";
    }
}

yml

rest-poxy:
#  数据平台提供接口的主机地址
  host: 127.0.0.1
#  接口的端口
  port: 8080
#  读取超时
  readTimeout: 35000
#  连接超时
  connectTimeout: 5000
#  最大连接数
  maxTotal: 500
#  同路由并发数100
  maxPerRoute: 100
#  重连接次数
  retryHandler: 3
#  连接不够用时的等待时间
  connectionRequestTimeout: 20000
#  连接需要的认真码
  authorizationCode: xxxxxxxxxxxxxxxxxxxx

配置类

import org.apache.http.client.HttpClient;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.ssl.TrustStrategy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpRequest;
import org.springframework.http.client.*;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.client.DefaultResponseErrorHandler;
import org.springframework.web.client.RestTemplate;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;
import java.io.IOException;
import java.nio.charset.Charset;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Collections;
import static org.apache.http.conn.socket.PlainConnectionSocketFactory.*;

/**
 * RestTemplate的配置类
 */
@Configuration
@ConditionalOnClass(ProxyConfig.class)
public class RestConfiguration {
    Logger logger = LoggerFactory.getLogger(RestConfiguration.class);
    @Autowired
    private ProxyConfig proxyConfig;

    @Bean
    public HttpComponentsClientHttpRequestFactory clientHttpRequestFactory() {
        try {
            HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
            SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() {
                public boolean isTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {
                    return true;
                }
            }).build();
            httpClientBuilder.setSSLContext(sslContext);
            HostnameVerifier hostnameVerifier = NoopHostnameVerifier.INSTANCE;
            SSLConnectionSocketFactory sslConnectionSocketFactory = new SSLConnectionSocketFactory(sslContext, hostnameVerifier);
            RegistryBuilder connectionSocketFactoryRegistryBuilder = RegistryBuilder.create();
            connectionSocketFactoryRegistryBuilder.register("http", getSocketFactory());
            connectionSocketFactoryRegistryBuilder.register("https", sslConnectionSocketFactory);
            Registry socketFactoryRegistry = connectionSocketFactoryRegistryBuilder.build();// 注册http和https请求
            // 开始设置连接池
            PoolingHttpClientConnectionManager poolingHttpClientConnectionManager = new PoolingHttpClientConnectionManager(socketFactoryRegistry);
            poolingHttpClientConnectionManager.setMaxTotal(proxyConfig.getMaxTotal());
            poolingHttpClientConnectionManager.setDefaultMaxPerRoute(proxyConfig.getMaxPerRoute());
            httpClientBuilder.setConnectionManager(poolingHttpClientConnectionManager);
            httpClientBuilder.setRetryHandler(new DefaultHttpRequestRetryHandler(proxyConfig.getRetryHandler(), true));
            HttpClient httpClient = httpClientBuilder.build();
            HttpComponentsClientHttpRequestFactory clientHttpRequestFactory = new HttpComponentsClientHttpRequestFactory(httpClient);
            clientHttpRequestFactory.setConnectTimeout(proxyConfig.getConnectTimeout());
            clientHttpRequestFactory.setReadTimeout(proxyConfig.getReadTimeout());
            clientHttpRequestFactory.setConnectionRequestTimeout(proxyConfig.getConnectionRequestTimeout());
            return clientHttpRequestFactory;
        } catch (KeyManagementException | NoSuchAlgorithmException | KeyStoreException e) {
            logger.error("初始化HTTP连接池出错", e);
        }
        return null;
    }

    @Bean
    public RestTemplate restTemplate() {
        RestTemplate restTemplate = new RestTemplate();
        restTemplate.setRequestFactory(clientHttpRequestFactory());
        restTemplate.setErrorHandler(new DefaultResponseErrorHandler());
        restTemplate.getMessageConverters().add(0, new StringHttpMessageConverter(Charset.forName("UTF-8")));
        //用拦截器的方式统一设置认证信息等公共参数
        restTemplate.setInterceptors(Collections.singletonList(new ClientHttpRequestInterceptor(){
            @Override
            public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
                HttpHeaders headers = request.getHeaders();
                headers.add("Authorization", proxyConfig.getAuthorizationCode());
                return execution.execute(request, body);
            }
        }));
        return restTemplate;
    }
}

前端调用我的接口，我调用别的服务接口，将结果返回给前端

@RestController
public class proxyController {
 	Logger logger = LoggerFactory.getLogger(proxyController.class);
    @Autowired
    private ProxyConfig proxyConfig;
    @Autowired
    private RestTemplate restTemplate;
	/**
	*以/proxy开头的url都会被拦截，然后用resttemplate统一调用别的服务接口并返回结果
	*proxy后的路径以及传递的参数需要符合被调用的服务接口的样式
	*/
    @RequestMapping(value = "/proxy/**")  //(value = "/proxy/**",method = {RequestMethod.GET,RequestMethod.POST,})
    public Object proxy(@RequestBody Map parm, HttpServletRequest request) {
        try {
            String uri = request.getRequestURI();
            String suffix = StringUtils.substringAfter(uri,"/proxy");
            HttpMethod method = HttpMethod.valueOf(request.getMethod());
            HttpEntity entity = new HttpEntity(parm);
            //调用数据平台的url
            String url = proxyConfig.getUrlPrefix() + suffix;
            return restTemplate.exchange(url,method,entity,Map.class);
        } catch (Exception e) {
             logger.error("resttemplate中调用时出错", e);
            return null;
        }
    }
}