RestTemplete

RestTemplete是由spring提供的，可以用来模拟浏览器进行服务调用的封装好的Api，和Apache 的HttpClient功能相同，在分布式系统中可以用来服务之间的调用。

开发步骤：

1.引入jar包

<dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-web</artifactId>

            <version>${spring.version}</version>

        </dependency>

2.定义通信数据模型

package com.yzdc.in.model;

import java.io.Serializable;

public class MSG implements Serializable{

    String status;

    Object data;

    public MSG() {

    }

    public MSG(String status) {

        this.status = status;

    }

    public MSG(String status, Object data) {

        this.status = status;

        this.data = data;

    }

    public Object getData() {

        return data;

    }

    public void setData(Object data) {

        this.data = data;

    }

    public String getStatus() {

        return status;

    }

    public void setStatus(String status) {

        this.status = status;

    }

}

3.编写被调用方的Restful风格的Api

@RequestMapping(value = "message_consumer",method = RequestMethod.POST,consumes="application/json")

    @ResponseBody

    public MSG receiveMessage(@RequestBody ReportData reportData){

        genetatorService.generatorMessage(reportData.getEquipId(),reportData.getThresholdId(),reportData.getValue());

        return new MSG("200");

    }

4.实例化RestTemplete（交给spring）

spring-mvc.xml:

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

       xmlns:context="http://www.springframework.org/schema/context"

       xmlns:mvc="http://www.springframework.org/schema/mvc"

       xsi:schemaLocation="

    http://www.springframework.org/schema/beans

    http://www.springframework.org/schema/beans/spring-beans-3.2.xsd

    http://www.springframework.org/schema/context

    http://www.springframework.org/schema/context/spring-context-3.2.xsd

    http://www.springframework.org/schema/mvc

    http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">

    <mvc:annotation-driven/>

    <!-- 扫描controller（controller层注入）-->

    <context:component-scan base-package="com.yzdc.in.controller"/>

    <mvc:view-controller path="/" view-name="index"/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="order" value="1"/>

        <property name="prefix" value="/WEB-INF/views/"/>

        <property name="suffix" value=".jsp"/>

        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>

    </bean>

    <!-- Client -->

    <bean id="restTemplate" class="org.springframework.web.client.RestTemplate">

        <property name="messageConverters">

            <list>

                <bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">

                    <property name="supportedMediaTypes">

                        <list>

                            <value>application/json;charset=UTF-8</value>

                        </list>

                    </property>

                </bean>

            </list>

        </property>

    </bean>

</beans>

4.调用方使用RestTemplete调用：

注入RestTempete

@Autowired

    private RestTemplate restTemplate;

调用url:

HttpHeaders headers = new HttpHeaders();

headers.setContentType(MediaType.APPLICATION_JSON);

HttpEntity<ReportData> entity = new HttpEntity<ReportData>(reportData,headers);

MSG msg = restTemplate.postForObject("http://localhost:8016/minapp/alarm/generator/message_consumer",entity,MSG.class);