如何让Springboot RestTemplate同时支持发送HTTP及HTTPS请求呢？

RestTemplate简介

 
RestTemplate简介:
   从Spring3.0开始支持的一个远程HTTP请求工具
RestTemplate用途:
    可对外提供常见的Rest服务请求调用方式,使用RestTemplate请求可使客户端开发的效率提高
    RestTemplate支持GET请求、POST 请求、PUT 请求、DELETE请求及一些通用的请求执行方法 exchange及execute

RestTemplate:
   是spring-web-xxx.jar包中提供的Http协议实现类
   当导入spring-boot-starter-web的项目可以接使用RestTemplate类

RestTemplate示例

1.新建HttpsClientRequestFactory.java类实现SimpleClientHttpRequestFactory

package com.java265.config;
 
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;
/** 
 * @describe同时支持http及https请求★/
 */
public class HttpsClientRequestFactory extends SimpleClientHttpRequestFactory {
    @Override
    protected void prepareConnection(HttpURLConnection connection, String httpMethod){
        try{
            if(!(connection instanceof HttpsURLConnection)){
                //http协议
                super.prepareConnection (connection, httpMethod) ;
            }
            if ((connection instanceof HttpsURLConnection)) {
                //https协议
                KeyStore trustStore = KeyStore.getInstance (KeyStore.getDefaultType());
                //信任任何链接
                TrustStrategy anyTrustStrategy = new TrustStrategy(){
                    @Override
                    public boolean isTrusted (X509Certificate[] chain,String authType) throws CertificateException{
                        return true;
                    }
                };
                SSLContext ctx = SSLContexts.custom().useSSL().loadTrustMaterial(trustStore , anyTrustStrategy).build();
                ((HttpsURLConnection) connection).setSSLSocketFactory(ctx.getSocketFactory());
                HttpsURLConnection httpsConnection = (HttpsURLConnection) connection;
                super.prepareConnection(httpsConnection,httpMethod) ;
            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }
 
}

创建RestTemplate配置类注册Bean

package com.java265.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.client.RestTemplate;
 
import java.nio.charset.StandardCharsets;
import java.util.list;
 
/** 
 * *RestTemplateConfig配置文件
 */
@Configuration
public class RestTemplateConfig {
    @Bean
    public RestTemplate restTemplate(){
        //同时支持http和https请求方式
        RestTemplate restTemplate = new RestTemplate (new HttpsClientRequestFactory());
        List<HttpMessageConverter<?>> converterList = restTemplate.getMessageConverters();
        //重新设置StringHttpMessageConverter字符集为UTF-8，解决中文乱码问题
        HttpMessageConverter<?> converterTarget = null;
        for (HttpMessageConverter<?> item : converterList){
            if (StringHttpMessageConverter.class == item.getClass()){
                converterTarget = item;
                break;
            }
        }
        if (null != converterTarget){
            converterList.remove(converterTarget);
        }
 
        converterList.add(1,new StringHttpMessageConverter(StandardCharsets.UTF_8));
        return restTemplate;
    }
}

封装RestTemplate

package com.java265.util;
 
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestClientException;
import org.springframework.web.client.RestTemplate;
 
@Component
@Slf4j
public class httpRequestUtil {
    @Autowired
    private RestTemplate restTemplate;
    @Autowired
    //get,delete,put请求
    private ObjectMapper objectMapper;
    public <T> T getRequest(String url, HttpMethod httpMethod, HttpEntity httpEntity,Class<T> clazz){
        try{
            ResponseEntity exchange = restTemplate.exchange(url,httpMethod,httpEntity,clazz);
            return (T) exchange.getBody();
 
        }catch (RestClientException e){
            log.error(e.getMessage(), e);
            return null;
        }
    }
    //post请求
    public <T> T postRequest(String url, HttpEntity httpEntity,Class<T> clazz){
        try{
            String exchange = restTemplate.postForObject(url,httpEntity,String.class);
            return(T) objectMapper.readValue(exchange,clazz);
 
        }catch (JsonMappingException e){
            log.error(e.getMessage(), e);
            return null;
        }catch (JsonProcessingException e){
            log.error(e.getMessage(), e);
            return null;
        }
    }
}

测试样例

package com.java265.controller;
 
import com.java265.util.httpRequestUtil;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
 
@RestController
@Slf4j
public class test {
    @Autowired
    public httpRequestUtil httpRequestUtil;
    @Autowired
    private ObjectMapper objectMapper;
    private String applicationJson = "application/json";
    private String applicationStr = "application/X-WWW-form-urlencoded";
    @GetMapping("/test")
    public String test() {
        StringBuilder userUrl = new StringBuilder("http://java265.com/getApiInfo")
                .append("?key=").append("88888")
                .append("&name=").append("java");
        ObjectNode rootNode = objectMapper.createObjectNode();
        rootNode.put( "v","8888");
        rootNode.put( "t", "男");
        try{
            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_JSON);
            headers.add("Content-Type", applicationJson);
            HttpEntity httpEntity = new HttpEntity(rootNode.toString(),headers);
            String result = httpRequestUtil.postRequest(userUrl.toString() , httpEntity, String.class);
            return result;
        }catch (Exception e){
            log.error("调用接口失败:"+e.getMessage());
            return null;
        }
    }
}