简化API提升开发效率RestTemplate与HttpClient OkHttp关系详解

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
</dependency>

@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);
        factory.setConnectTimeout(10000);
        return factory;
    }
}

//该方法仅返回HTTP协议的响应体，如果你只关注返回的内容，用这个方法即可
public <T> T getForObject(String url, Class<T> responseType, Object... uriVariables );
//该方法返回ResponseEntity，包含了整个HTTP响应
public <T> org.springframework.http.ResponseEntity<T> getForEntity(String url, Class<T> responseType, Object... uriVariables );
public <T> org.springframework.http.ResponseEntity<T> getForEntity(String url, Class<T> responseType, java.util.Map<String, ?> uriVariables );

//该方法仅返回HTTP协议的响应体，如果你只关注返回的内容，用这个方法即可
public <T> T postForObject(String url, @Nullable Object request, Class<T> responseType, Object... uriVariables );
//该方法返回ResponseEntity，包含了整个HTTP响应
public <T> T postForObject(String url, @Nullable Object request, Class<T> responseType, Object... uriVariables );
public <T> T postForObject(String url, @Nullable Object request, Class<T> responseType, java.util.Map<String, ?> uriVariables );

//通用API
public <T> org.springframework.http.ResponseEntity<T> exchange(String url, org.springframework.http.HttpMethod method, @Nullable org.springframework.http.HttpEntity<?> requestEntity, Class<T> responseType, Object... uriVariables );
public <T> org.springframework.http.ResponseEntity<T> exchange(String url, org.springframework.http.HttpMethod method, @Nullable org.springframework.http.HttpEntity<?> requestEntity, Class<T> responseType, java.util.Map<String, ?> uriVariables );

String res = restTemplate.getForObject(sb.toString(), String.class);
Map result = JSON.parseObject(res, Map.class);
String res = restTemplate.postForObject(url, requestBody, String.class);
Map result = JSON.parseObject(res, Map.class);
//可以用来下载图片
HttpEntity httpEntity = new HttpEntity<>(requestBody);
ResponseEntity<byte[]> responseEntity = restTemplate.exchange(url, HttpMethod.POST, httpEntity, byte[].class);
byte[] buffer = responseEntity.getBody();