Spring RestTemplate: 比httpClient更优雅的Restful URL访问, java HttpPost with header

妖狐艹你老母 2023-10-18 12:18 50阅读 0赞

\{  
“Author”: “tomcat and jerry”,  
“url”:“[http://www.cnblogs.com/tomcatandjerry/p/5899722.html][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][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  
复制代码  
@RequestMapping("/async")  
public String asyncReq()\{  
String url = “[http://localhost:8080/jsonAsync][http_localhost_8080_jsonAsync]”;  
ListenableFuture<ResponseEntity> future = asyncRestTemplate.getForEntity(url, JSONObject.class);  
future.addCallback(new SuccessCallback<ResponseEntity>() \{  
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][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();  
\}

原网址：[https://www.cnblogs.com/tomcatandjerry/p/5899722.html][https_www.cnblogs.com_tomcatandjerry_p_5899722.html]

[http_www.cnblogs.com_tomcatandjerry_p_5899722.html]: http://www.cnblogs.com/tomcatandjerry/p/5899722.html
[http_localhost_8080_json]: http://localhost:8080/json
[http_localhost_8080_jsonAsync]: http://localhost:8080/jsonAsync
[http_localhost_8080_headerApi]: http://localhost:8080/headerApi
[https_www.cnblogs.com_tomcatandjerry_p_5899722.html]: https://www.cnblogs.com/tomcatandjerry/p/5899722.html