最近的项目需求中有使用到后端发送http请求，在网上寻找资料后发现可以使用spring自带的RestTemplate类实现，故作此记录
将下述代码引入spring容器中（RestTemplate是spring自带的发送http请求的类）
@Bean
public RestTemplate restTemplate(ClientHttpRequestFactory factory) {
RestTemplate restTemplate = new RestTemplate(factory);
return restTemplate;
}
@Bean
public ClientHttpRequestFactory simpleClientHttpRequestFactory() {
SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
factory.setReadTimeout(5000);
factory.setConnectTimeout(15000);
// 设置代理
//factory.setProxy(null);
return factory;
}
在需要使用的类中直接引入即可
@Autowired private RestTemplate restTemplate;
代码示例
这里简单示例下post请求，如果又其它需求的可以去搜索一下其它文章
**注意：**发送的post的传参的类型一定要是LinkedMultiValueMap（不能使用jsonobject），否则会报找不到数据的错误
@GetMapping("send")
public String testPost(@RequestParam("code") Integer code){
String url = "http://localhost:8888/oauth/return";
LinkedMultiValueMap<String, Object> stringObjectLinkedMultiValueMap = new LinkedMultiValueMap<>();
stringObjectLinkedMultiValueMap.set("code",code);
HttpEntity<LinkedMultiValueMap<String, Object>> jsonObjectHttpEntity = new HttpEntity<>(stringObjectLinkedMultiValueMap);
ResponseEntity<String> stringResponseEntity = restTemplate.postForEntity(url, jsonObjectHttpEntity, String.class);
String body = stringResponseEntity.getBody();
return body;
}
@PostMapping("return")
public String returnPost(@RequestParam Integer code){
return "哈首府帕斯发";
}
发送POST请求传参的问题
如下代码，如果使用jsonobject来装载数据发送post请求是会报错的，只能使用LinkedMultiValueMap
@GetMapping("keycloak/getToken")
public String keycloakGetToken(@RequestParam Map<String,String> map){
//String code = requestObj.getString("code");
String url = "http://localhost:8081/auth/realms/myRealm/protocol/openid-connect/token";
String code = map.get("code");
System.out.println("传进来的code："+code);
//HttpHeaders headers = new HttpHeaders();
//JSONObject jsonObject = new JSONObject();
//jsonObject.put("grant_type","authorization_code");
//jsonObject.put("code",code);
//jsonObject.put("client_id","myclient");
//jsonObject.put("client_secret","LsvDoZ5g0BQhRDR9ydYqV9tjal8YDeAI");
//jsonObject.put("scope","openid");
//jsonObject.put("redirect_uri","http://localhost:8888/oauth/keycloak/getToken");
//HttpEntity<JSONObject> jsonObjectHttpEntity = new HttpEntity<>(jsonObject,headers);
LinkedMultiValueMap<String, Object> stringObjectLinkedMultiValueMap = new LinkedMultiValueMap<>();
stringObjectLinkedMultiValueMap.set("grant_type","authorization_code");
stringObjectLinkedMultiValueMap.set("code",code);
stringObjectLinkedMultiValueMap.set("client_id","myclient");
stringObjectLinkedMultiValueMap.set("client_secret","LsvDoZ5g0BQhRDR9ydYqV9tjal8YDeAI");
stringObjectLinkedMultiValueMap.set("scope","openid");
stringObjectLinkedMultiValueMap.set("redirect_uri","http://localhost:8888/oauth/keycloak/getToken");
HttpEntity<LinkedMultiValueMap<String, Object>> jsonObjectHttpEntity = new HttpEntity<>(stringObjectLinkedMultiValueMap);
ResponseEntity<String> responseEntity = restTemplate.postForEntity(url, jsonObjectHttpEntity, String.class);
String body = responseEntity.getBody();
return body;
}
