Resttemplate to set params

How to set request parameters using RestTemplate

The way RestTemplate sets request parameters varies according to the request type (GET/POST) and parameter form (path parameters, query parameters, JSON request body). The following is the specific implementation method:

1. GET request parameter settings

Path parameters
Use placeholders{param},passMapOr variable parameter passing:

// Use Map to pass parametersMap&lt;String, String&gt; uriVariables = new HashMap&lt;&gt;();
("id", "123");
String result = ("/api/{id}", , uriVariables);
// Or use variable parametersString result = ("/api/{id}", , "123");

Query parameters
useUriComponentsBuilderBuild a URL with parameters:

UriComponentsBuilder builder = ("/api/data")
    .queryParam("name", "John")
    .queryParam("age", 25);
String url = ();
String result = (url, );

2. POST request parameter setting

JSON request body
useHttpEntityEncapsulate nested JSON parameters and set the request header:

// Build nested parametersMap&lt;String, Object&gt; paramMap = new HashMap&lt;&gt;();
Map&lt;String, String&gt; queryMap = new HashMap&lt;&gt;();
("c1", "value1");
("a", "valueA");
("b", queryMap);
// Set request headerHttpHeaders headers = new HttpHeaders();
(MediaType.APPLICATION_JSON);
HttpEntity&lt;Map&lt;String, Object&gt;&gt; entity = new HttpEntity&lt;&gt;(paramMap, headers);
// Send a requestString response = ("/api", entity, );

References to the multi-layer nested JSON construction method in the example.

Form parameters
useMultiValueMapPass form data:

HttpHeaders headers = new HttpHeaders();
(MediaType.APPLICATION_FORM_URLENCODED);
MultiValueMap<String, String> formData = new LinkedMultiValueMap<>();
("username", "admin");
("password", "123456");
HttpEntity<MultiValueMap<String, String>> entity = new HttpEntity<>(formData, headers);
ResponseEntity<String> response = ("/login", entity, );

3. Configure RestTemplate timeout (optional)

Set connection and read timeouts through configuration classes:

@Configuration
public class RestTemplateConfig {
    @Bean
    public RestTemplate restTemplate() {
        SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
        (10000); // 10 seconds        (10000);    // 10 seconds        return new RestTemplate(factory);
    }
}

Reference configuration class example.

4. Handle complex responses

Parses JSON response and extracts data:

ResponseEntity<String> response = (url, , entity, );
JSONObject jsonResponse = new JSONObject(());
if ("0000".equals(("parameter").getString("code"))) {
    String result = ("result");
}

Reference response processing method.

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