RESTful接口调用

javax.ws.rs-api

https://blog.csdn.net/qq_22177809/article/details/86592660

jersey

服务端简单的使用：https://blog.csdn.net/github_38395241/article/details/70265379
客户端简单使用：https://blog.csdn.net/Maxiao1204/article/details/118720979

在 spring-boot-starter-web 中用 jetty 代替 tomcat
在 spring-boot-starter-web 移除现有的依赖项，并把下面这些添加进去。

 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-web</artifactId>
 <exclusions>
 <exclusion>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-tomcat</artifactId>
 </exclusion>
 </exclusions>
</dependency>
<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-jetty</artifactId>
</dependency>

客户端使用

配置请求响应类

package com.example.demo.jersey;
public class ClientResponse<T> {
    private int status;
    private T entity;
    private String message;
    private ClientResponse() {
    }
    private ClientResponse(int status, T entity) {
        this.status = status;
        this.entity = entity;
    }
    private ClientResponse(String message, int status) {
        this.status = status;
        this.message = message;
    }
    public int getStatus() {
        return this.status;
    }
    public void setStatus(int status) {
        this.status = status;
    }
    public T getEntity() {
        return this.entity;
    }
    public void setEntity(T entity) {
        this.entity = entity;
    }
    public String getMessage() {
        return this.message;
    }
    public void setMessage(String message) {
        this.message = message;
    }
    public static <T> ClientResponse successResponse(T entity) {
        return new ClientResponse( 200,entity);
    }
    public static <T> ClientResponse errorResponse(String message) {
        return new ClientResponse(message, 400);
    }
}

配置HttpClientUtil工具类

package com.example.demo.jersey;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Entity;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
public class HttpClientUtil {
    private Client client;
    private String baseUrl;
    private WebTarget webTarget;
    public enum HttpMethod {
        //get
        GET("GET"),POST("POST"),PUT("PUT"),DELETE("DELETE");
        String method;
        HttpMethod(String method){
            this.method = method;
        }
    }
    private HttpClientUtil(String baseUrl){
        this.client = ClientBuilder.newClient();
        this.baseUrl = baseUrl;
        this.webTarget = this.client.target(this.baseUrl);
    }
    public static <T> ClientResponse httpRequest(String url , HttpMethod httpMethod, Object params, Class<T> classType){
        HttpClientUtil httpClientUtil = null;
        Response response = null;
        try {
            httpClientUtil = new HttpClientUtil(url);
            switch (httpMethod) {
                case GET:
                    response = httpClientUtil.webTarget.request().get();
                    break;
                case POST:
                    response = httpClientUtil.webTarget.request().post(Entity.entity(params, MediaType.APPLICATION_JSON_TYPE));
                    break;
                case PUT:
                    response = httpClientUtil.webTarget.request().put(Entity.entity(params, MediaType.APPLICATION_JSON_TYPE));
                    break;
                case DELETE:
                    response = httpClientUtil.webTarget.request().delete();
                    break;
                default:
                    response = httpClientUtil.webTarget.request().get();
            }
            if (response.getStatus() != 200) {
                return ClientResponse.errorResponse("Failed with HTTP error code : " + response.getStatus());
            } else {
                return ClientResponse.successResponse(response.readEntity(classType));
            }
        } finally {
            if (response != null){
                response.close();
            }
            if (httpClientUtil != null){
                httpClientUtil.close();
            }
        }
    }
    public void close() {
        this.client.close();
    }
}

测试

import java.util.*;
public class Demo {
    public static void main(String[] args) {
        String url = "http://127.0.0.1:8056/heren/api/bill/pat-master-index/patient-id?patientId=11105298";
        ClientResponse response = HttpClientUtil.httpRequest(url, HttpClientUtil.HttpMethod.GET,null, Map.class);
        if (response.getStatus() == 200){
            Map map = (Map) response.getEntity();
            System.out.println(map.get("name"));
        } else {
            System.out.println(response.getMessage());
        }
    }
}