RestTemplate 远程调用服务接口

RESTful API调用详解

最新推荐文章于 2025-03-27 16:36:49 发布

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本文详细介绍了如何使用Spring框架的RestTemplate进行POST和GET请求，包括设置请求头、发送JSON格式的数据、处理响应以及配置RestTemplate。同时，还展示了如何自定义RestTemplate配置和错误处理。

1.post请求，参数为json格式

1.1

 HttpHeaders headers = new HttpHeaders();

 headers.setContentType(MediaType.APPLICATION_JSON);

 // 参数对象 person

 HttpEntity<Person> entity = new HttpEntity(person, headers);

// 如果没有返回值或者不获取返回值，泛型可以写Object
 ResponseEntity<Object> r = restTemplate.postForEntity("http://127.0.0.1:8080/t", entity, Object.class);

//如果需要获取返回值,必须指定具体泛型或者使用Map
ResponseEntity<Map> r = restTemplate.postForEntity("http://127.0.0.1:8080/t", entity, Map.class);
Map map = r.getBody();

// 比如返回值是Person
ResponseEntity<Person> r = restTemplate.postForEntity("http://127.0.0.1:8080/t", entity, Person.class);
Person person = r.getBody();

1.2

 HttpHeaders headers = new HttpHeaders();

 headers.setContentType(MediaType.APPLICATION_JSON);

 // 参数对象 person

 HttpEntity<Person> entity = new HttpEntity(person, headers);

//直接返回  数据对象
Person r = restTemplate.postForObject(url, entity, Person.class);

2 get请求

//同上面postForEntity  返回值泛型Map也可以的
ResponseEntity<Person> r = restTemplate.getForEntity("http://127.0.0.1:8080/t?id=111&name=klkkkkk", Person.class);

附：restTemplateconfig



import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.DependsOn;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.client.DefaultResponseErrorHandler;
import org.springframework.web.client.RestTemplate;

import java.io.IOException;
import java.nio.charset.Charset;

@Configuration
public class RestTemplateConfig {

    @Autowired
    private RestTemplateBuilder builder;

    @Bean
    public RestTemplate restTemplate() {
        RestTemplate restTemplate = builder.build();
        restTemplate.getMessageConverters().set(1,
                new StringHttpMessageConverter(Charset.forName("UTF-8")));
        restTemplate.setErrorHandler(new DefaultResponseErrorHandler() {
            @Override
            public void handleError(ClientHttpResponse response) throws IOException {
                if (response.getRawStatusCode() != 401) {
                    super.handleError(response);
                }
            }
        });

        return restTemplate;
    }


    @Bean
    public CustomRestTemplateCustomizer customRestTemplateCustomizer() {
        return new CustomRestTemplateCustomizer();
    }

    @Bean
    @DependsOn(value = {"customRestTemplateCustomizer"})
    public RestTemplateBuilder restTemplateBuilder() {
        return new RestTemplateBuilder(customRestTemplateCustomizer());
    }

}



//============================================================================
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.web.client.RestTemplateCustomizer;
import org.springframework.web.client.RestTemplate;

@Slf4j
public class CustomRestTemplateCustomizer implements RestTemplateCustomizer {

    @Override
    public void customize(RestTemplate restTemplate) {
        restTemplate.getInterceptors().add(new CustomClientHttpRequestInterceptor());

    }
}



//============================================================================



import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpRequest;
import org.springframework.http.client.ClientHttpRequestExecution;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.http.client.ClientHttpResponse;

import java.io.IOException;

@Slf4j
public class CustomClientHttpRequestInterceptor implements ClientHttpRequestInterceptor {

    @Override
    public ClientHttpResponse intercept(HttpRequest request, byte[] body,
                                        ClientHttpRequestExecution execution) throws IOException {
        logRequestDetails(request);
        return execution.execute(request, body);

    }

    private void logRequestDetails(HttpRequest request) {
        log.info("Headers: {}", request.getHeaders());
        log.info("Request Method: {}", request.getMethod());
        log.info("Request URI: {}", request.getURI());
    }


}

添加拦截器，打印调用信息

看效果：