一、应用场景

在spring cloud微服务中spring cloud feign针对RestTemplate做了封装,只能针对servername的请求,请求一些第三方api如百度开放api,支付api等需要通过host/ip+port请求,因此需要新配置一个RestTemplate

    @Bean
    RestTemplate remoteRestTemplate(){
        return new RestTemplate();
    }

二、主要代码

不需要去字符串空格可以将replace操作删除

1.工具类

public class HttpUtils {

    private static RestTemplate restTemplate = SpringBeanUtil.getBean("remoteRestTemplate", RestTemplate.class);

    private static ObjectMapper objectMapper = SpringBeanUtil.getBean("goldMsgobjectMapper", ObjectMapper.class);


    private HttpUtils() {
    }

    public static <T> T postJsonRequest(String url, Map<String, Object> bodyParams, TypeReference<T> responseType) throws IOException {
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);
        return postJsonRequest(url, headers, bodyParams, responseType);
    }


    public static <T> T postJsonRequest(String url, HttpHeaders headers, Map<String, Object> bodyParams, TypeReference<T> responseType) throws IOException {
        HttpEntity formEntity = new HttpEntity(objectMapper.writeValueAsString(bodyParams), headers);
        return objectMapper.readValue(
                restTemplate.postForObject(url, formEntity, String.class)
                        .replace(" ", "")
                        .replace("\n", "")
                        .replace("\t", ""),
                        responseType);
    }


    public static <T> T postRequest(String url, MultiValueMap<String, Object> bodyParams, TypeReference<T> responseType) throws IOException {
        return objectMapper.readValue(restTemplate.postForObject(url, bodyParams, String.class)
                        .replace(" ", "")
                        .replace("\n", "")
                        .replace("\t", ""),
                        responseType);
    }


    public static <T> T getRequest(String url, MultiValueMap<String, Object> headerParams, TypeReference<T> responseType) throws IOException {
        return objectMapper.readValue(
                restTemplate.getForObject(url, String.class, headerParams)
                        .replace(" ", "")
                        .replace("\n", "")
                        .replace("\t", ""),
                        responseType);
    }

}

2.spring bean工具类

@Component
public class SpringBeanUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
       if(null==this.applicationContext)  this.applicationContext = applicationContext;
    }

    public static <T> T getObject(Class<T> tClass) {
        return applicationContext.getBean(tClass);
    }

    public static <T> T getBean(String tClassName, Class<T> tClass) {
        return (T)applicationContext.getBean(tClassName);
    }

    public <T> T getBean(Class<T> tClass) {
        return applicationContext.getBean(tClass);
    }
}

3.配置objectMapper

我个人比较喜欢用的json库是jackson因为规范,而且全局配置一个ObjectMapper性能优于fastjson,gson等json库的

    
    @Bean()
    ObjectMapper goldMsgobjectMapper(){
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        return objectMapper;
    }