Spring RestTemplate http/https 微信小程序 临时登录凭证code 获取 session_key 和 openid

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{
  "Author": "tomcat and jerry",
  "url":"http://www.cnblogs.com/tomcatandjerry/p/5899722.html"    
}

Spring RestTemplate, 使用java访问URL更加优雅，更加方便。

核心代码：

String url = "http://localhost:8080/json";
JSONObject json = restTemplate.getForEntity(url, JSONObject.class).getBody();

就这么简单，API访问完成了！

 

附上SpringBoot相关的完整代码：

RestTemplateConfig.java

@Configuration
public class RestTemplateConfig{
    @Bean
    public RestTemplate restTemplate(ClientHttpRequestFactory factory){
        return new RestTemplate(factory);
    }
    
    @Bean
    public ClientHttpRequestFactory simpleClientHttpRequestFactory(){
        SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
        factory.setReadTimeout(5000);//ms
        factory.setConnectTimeout(15000);//ms
        return factory;
    }
}

 

SpringRestTemplateApp.java
@RestController
@EnableAutoConfiguration
@Import(value = {Conf.class})
public class SpringRestTemplateApp {
    
    @Autowired
    RestTemplate restTemplate;
    
    /***********HTTP GET method*************/
    @RequestMapping("")
    public String hello(){
        String url = "http://localhost:8080/json";
        JSONObject json = restTemplate.getForEntity(url, JSONObject.class).getBody();
        return json.toJSONString();
    }
    
    @RequestMapping("/json")
    public Object genJson(){
        JSONObject json = new JSONObject();
        json.put("descp", "this is spring rest template sample");
        return json;
    }
    
    /**********HTTP POST method**************/
    @RequestMapping("/postApi")
    public Object iAmPostApi(@RequestBody JSONObject parm){
        System.out.println(parm.toJSONString());
        parm.put("result", "hello post");
        return parm;
    }
    
    @RequestMapping("/post")
    public Object testPost(){
        String url = "http://localhost:8080/postApi";
        JSONObject postData = new JSONObject();
        postData.put("descp", "request for post");
        JSONObject json = restTemplate.postForEntity(url, postData, JSONObject.class).getBody();
        return json.toJSONString();
    }
    
    public static void main(String[] args) throws Exception {
        SpringApplication.run(SpringRestTemplateApp.class, args);
    }
    
}

===============================

另外还支持异步调用AsyncRestTemplate

@RequestMapping("/async")
    public String asyncReq(){
        String url = "http://localhost:8080/jsonAsync";
        ListenableFuture> future = asyncRestTemplate.getForEntity(url, JSONObject.class);
        future.addCallback(new SuccessCallback>() {
            public void onSuccess(ResponseEntity result) {
                System.out.println(result.getBody().toJSONString());
            }
        }, new FailureCallback() {
            public void onFailure(Throwable ex) {
                System.out.println("onFailure:"+ex);
            }
        });
        return "this is async sample";
    }

 ================================

贴一段post请求如何自定义header

@RequestMapping("/headerApi")//模拟远程的restful API
    public JSONObject withHeader(@RequestBody JSONObject parm, HttpServletRequest req){
        System.out.println("headerApi====="+parm.toJSONString());
        Enumeration headers = req.getHeaderNames();
        JSONObject result = new JSONObject();
        while(headers.hasMoreElements()){
            String name = headers.nextElement();
            System.out.println("["+name+"]="+req.getHeader(name));
            result.put(name, req.getHeader(name));
        }
        result.put("descp", "this is from header");
        return result;
    }

    @RequestMapping("/header")
    public Object postWithHeader(){
　　　　//该方法通过restTemplate请求远程restfulAPI
        HttpHeaders headers = new HttpHeaders();
        headers.set("auth_token", "asdfgh");
        headers.set("Other-Header", "othervalue");
        headers.setContentType(MediaType.APPLICATION_JSON);
        
        JSONObject parm = new JSONObject();
        parm.put("parm", "1234");
        HttpEntity entity = new HttpEntity(parm, headers);
        HttpEntity response = restTemplate.exchange(
                "http://localhost:8080/headerApi", HttpMethod.POST, entity, String.class);//这里放JSONObject, String 都可以。因为JSONObject返回的时候其实也就是string
        return response.getBody();
    }

访问https

import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.TrustStrategy;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.springframework.http.ResponseEntity;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;

import javax.net.ssl.SSLContext;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.X509Certificate;

public class WeixinTest {
    public static void main(String[] args) throws NoSuchAlgorithmException, KeyStoreException, KeyManagementException {
        String appid = "";
        String secret = "";
        String grant_type = "";
        String js_code = "";
        String url = "https://api.weixin.qq.com/sns/jscode2session?appid="+appid+"&secret="+secret+"&js_code="+js_code+"&grant_type="+grant_type;
/*        SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
        factory.setReadTimeout(5000);//ms
        factory.setConnectTimeout(15000);//ms
        RestTemplate  restTemplate =  new RestTemplate(factory);*/
        ResponseEntity responseEntity = restTemplate().getForEntity(url, String.class);
        System.out.println(responseEntity.getBody());
    }

    public static RestTemplate restTemplate() throws KeyStoreException, NoSuchAlgorithmException, KeyManagementException {
        TrustStrategy acceptingTrustStrategy = (X509Certificate[] chain, String authType) -> true;
        SSLContext sslContext = org.apache.http.ssl.SSLContexts.custom()
                .loadTrustMaterial(null, acceptingTrustStrategy)
                .build();
        SSLConnectionSocketFactory csf = new SSLConnectionSocketFactory(sslContext);
        CloseableHttpClient httpClient = HttpClients.custom()
                .setSSLSocketFactory(csf)
                .build();
        HttpComponentsClientHttpRequestFactory requestFactory =
                new HttpComponentsClientHttpRequestFactory();
        requestFactory.setHttpClient(httpClient);
        RestTemplate restTemplate = new RestTemplate(requestFactory);
        return restTemplate;
    }

maven

        
            org.apache.httpcomponents
            httpclient
            4.5.3
        

这里使用httpclient的factory

配置

    @Bean
    public RestTemplate restTemplate() throws KeyStoreException, NoSuchAlgorithmException, KeyManagementException {
        TrustStrategy acceptingTrustStrategy = (X509Certificate[] chain, String authType) -> true;

        SSLContext sslContext = org.apache.http.ssl.SSLContexts.custom()
                .loadTrustMaterial(null, acceptingTrustStrategy)
                .build();

        SSLConnectionSocketFactory csf = new SSLConnectionSocketFactory(sslContext);

        CloseableHttpClient httpClient = HttpClients.custom()
                .setSSLSocketFactory(csf)
                .build();

        HttpComponentsClientHttpRequestFactory requestFactory =
                new HttpComponentsClientHttpRequestFactory();

        requestFactory.setHttpClient(httpClient);
        RestTemplate restTemplate = new RestTemplate(requestFactory);
        return restTemplate;
    }

验证

    @Test
    public void testHttps(){
        String url = "https://free-api.heweather.com/v5/forecast?city=CN101080101&key=5c043b56de9f4371b0c7f8bee8f5b75e";
        String resp = restTemplate.getForObject(url, String.class);
        System.out.println(resp);
    }