RestTemplate模板对象封装HttpClient 对PRC的实现

1. RestTemplate模板对象介绍

1.1创建spring-resttmplate(jar)项目

1.2添加依赖

1.3  application-server.xml

1.4 测试restTemplate对象发送post请求

1.5使用RestTemplate对象发送Get请求

1.6 使用RestTemplate对象发送Post请求

代码总结:

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1. RestTemplate模板对象介绍

Spring提供的用来发送http请求的对象，完成httpclient操作的封装

1.1创建spring-resttmplate(jar)项目

1.2添加依赖

  4.0.0
  com.bjsxt.rest
  spring-resttemplate
  0.0.1-SNAPSHOT
  
  
  	
	
		org.springframework
		spring-webmvc
		4.3.18.RELEASE
	
	
		
			com.fasterxml.jackson.core
			jackson-databind
			2.9.9.3
		
  

1.3  application-server.xml

1.4 测试restTemplate对象发送post请求

package com.bjsxt.app;


import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.http.HttpEntity;
import org.springframework.http.ResponseEntity;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.web.client.RestTemplate;

import com.bjsxt.pojo.Orders;

public class RestTemplateApp {

	static RestTemplate template;
	/***
	 * 测试RestTemplate对象的使用
	 */
	public static void main(String[] args) {
		//加载Spring容器
		ApplicationContext ac
			=new ClassPathXmlApplicationContext("application-service.xml");
		//获得容器中的RestTemplate对象
		template = (RestTemplate) ac.getBean("template");
		
		sendPost();
	}
	
	/***
	 * 是RestTemplate对象发送Post
	 */
	public static void sendPost() {
		
		//创建LinkedMultiValueMap封装请求头信息
		LinkedMultiValueMap 
			headers=new LinkedMultiValueMap();
		headers.add("Content-Type", "application/x-www-form-urlencoded");
		
		//封装请求体数据
		LinkedMultiValueMap body=
				new LinkedMultiValueMap();
		body.add("vid", "12345678");
		
		
		//创建HttpEntity对象，封装请求体和请求头信息
		HttpEntity> 
			entity=new HttpEntity<>(body,headers);
		
		String url="http://localhost:8081/loadOrdersList";
		//发送http，post请求,获得请求体
		//Orders[] results=template.postForObject(url,entity, Orders[].class);
		//List asList = Arrays.asList(results);
		
		//发送http，post请求,响应回来请求头和请求体
		ResponseEntity response 
			= template.postForEntity(url,entity, Orders[].class);
		//获得请求头
		int statusCodeValue = response.getStatusCodeValue();
		System.out.println(statusCodeValue);
		//获得请求体
		Orders[] results = response.getBody();
		for(Orders orders:results) {
			System.out.println(orders.getId()+"\t"+orders.getRemark()
			+"\t"+orders.getOdate()+"\t"+orders.getVip());
		}
	}
	/***
	 * 是RestTemplate对象发送Get
	 */
	/***
	 * 是RestTemplate发送Post请求，提交json字符串
	 */
	
	
}

1.5使用RestTemplate对象发送Get请求

/***
	 * 是RestTemplate对象发送Get
	 */
	public static void sendGet() {
		String url="http://localhost:8081/loadOrders?id=888888";
		/***
		 * ResponseEntity 封装了请求头和请求体
		 */
		//ResponseEntity entity = template.getForEntity(url, Orders.class);
		//Orders orders = entity.getBody();
		
		//只获得请求体
		Orders orders = template.getForObject(url, Orders.class);
		System.out.println(orders.getId()+"\t"+orders.getRemark()
			+"\t"+orders.getVip()+"\t"+orders.getOdate());
		
	}

1.6 使用RestTemplate对象发送Post请求

/***
	 * 是RestTemplate发送Post请求，提交json字符串
	 */
	public static void sendPostObject() {
		//创建Orders对象
		Orders orders=new Orders();
		orders.setId(77777777);
		orders.setRemark("周末配送....");
		orders.setOdate("2010-10-10");
		orders.setVip(99999);
		
		//封装请求头信息
		HttpHeaders header=new HttpHeaders();
		header.setContentType(MediaType.APPLICATION_JSON_UTF8);
		
		//将javabean对象转化为json字符串
		String jsonString = JSON.toJSONString(orders);
		//将请求体和请求头信息封装
		HttpEntity entity=new HttpEntity(jsonString,header);
		
		String url="http://localhost:8081/saveOrders";
		//发送post请求
		Map result = template.postForObject(url, entity, Map.class);
		System.out.println(result);
		
	}

 

代码总结:

import java.util.Map;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.web.client.RestTemplate;

import com.alibaba.fastjson.JSON;
import com.bjsxt.pojo.Orders;
import com.fasterxml.jackson.databind.util.JSONPObject;

public class RestTemplateTest {
	static RestTemplate template;

	public static void main(String[] args) {
		// 加载Spring容器
		ApplicationContext ac = new ClassPathXmlApplicationContext("application-service.xml");
		// 获得容器中的RestTemplate对象
		template = (RestTemplate) ac.getBean("template");

		sendObject();
	}

	// 发送post请求
	public static void sendPost() {
		// 创建LinkedMultiValueMap封装请求头信息
		LinkedMultiValueMap headers = new LinkedMultiValueMap();
		headers.add("Content-Type", "application/x-www-form-urlencoded");

		// 封装请求体数据
		LinkedMultiValueMap body = new LinkedMultiValueMap();
		body.add("vid", "12345678");

		// 创建HttpEntity对象，封装请求体和请求头信息
		HttpEntity> entity = new HttpEntity<>(body, headers);

		String url = "http://localhost:8081/loadOrdersList";
		// 发送http，post请求,获得请求体
		// Orders[] results=template.postForObject(url,entity, Orders[].class);
		// List asList = Arrays.asList(results);

		// 发送http，post请求,响应回来请求头和请求体
		ResponseEntity response = template.postForEntity(url, entity, Orders[].class);
		// 获得请求头
		int statusCodeValue = response.getStatusCodeValue();
		System.out.println(statusCodeValue);
		// 获得请求体
		Orders[] results = response.getBody();
		for (Orders orders : results) {
			System.out.println(
					orders.getId() + "\t" + orders.getRemark() + "\t" + orders.getOdate() + "\t" + orders.getVip());
		}
	}

	// 发送get请求
	public static void sendGet() {
		String url = "http://localhost:8081/selectOrder?id=88888";
		ResponseEntity response = template.getForEntity(url, Orders.class);
		Orders body = response.getBody();
		System.out.println(body);
	}

	// 发送对象json字符串
	public static void sendObject() {
		// 创建Orders对象
		Orders orders = new Orders();
		orders.setId(77777777);
		orders.setRemark("周末配送....");
		orders.setOdate("2010-10-10");
		orders.setVip(99999);
		String url="http://localhost:8081/addOrders";
		//把对象封装为json字符串
		String jsonString = JSON.toJSONString(orders);
		//封装响应头为json'格式的响应
		HttpHeaders header=new HttpHeaders();
		header.setContentType(MediaType.APPLICATION_JSON_UTF8);
		//传入两个对象（第一个是请求体、第二个是请求头）
		HttpEntityrequest=new HttpEntity<>(jsonString,header);
		Mapmap
			= template.postForObject(url, request, Map.class);
		System.out.println(map);
		
	}
}