2.5 直连方式 dubbo
点对点的直连项目 : 消费者直接访问服务提供者,没有注册中心。消费者必须指定服务提供者的访问地址( url )。
消费者直接通过 url 地址访问固定的服务提供者。这个 url 地址是不变的。
2.5.1 实现目标
(1) 创建服务提供者:
A 、新建 空工程java project
创建archety-webapp的model
项目名称: 001-link-userservice-provider
设置 version 为 1.0.0
项目结构
B 、 maven pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.it.dubbo</groupId>
<artifactId>001-link-userservice-provider</artifactId>
<version>1.0.0</version>
<packaging>war</packaging>
<dependencies>
<!-- spring依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.16.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.3.16.RELEASE</version>
</dependency>
<!--dubbo依赖-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.6.2</version>
</dependency>
</dependencies>
<build>
<plugins>
<!--jdk1.8编译插件-->
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
C 、 创建订单实体类:User
package com.it.dubbo.entity;
import java.io.Serializable;
public class User implements Serializable {
private Integer id;
private String name;
private Integer age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", age=" + age +
'}';
}
}
D 、新建订单服务接口: UserService
package com.it.dubbo.service;
import com.it.dubbo.entity.User;
public interface UserService {
//根据用户标识获取用户信息
User queryUserById(Integer id);
}
E 、 新建接口的实现类: UserServiceImpl
package com.it.dubbo.service.impl;
import com.it.dubbo.entity.User;
import com.it.dubbo.service.UserService;
public class UserServiceImpl implements UserService {
@Override
public User queryUserById(Integer id) {
User user=new User();
user.setId(id);
user.setName("小明");
user.setAge(19);
return user;
}
}
F 、 创建 dubbo 配置文件
dubbo-userservice-provider.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:dubbo="http://dubbo.apache.org/schema/dubbo"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd">
<!-- 服务提供者声明名称:必须保证服务名称的唯一性,它的名称是dubbo名称使用的唯一标识-->
<dubbo:application name="001-link-userservice-provider"/>
<!--访问服务协议的名称及端口号,dubbo官方推荐使用的是dubbo协议,端口号默认为20880-->
<!--name:指定协议的名称
port:执行协议的端口号,默认20880
-->
<dubbo:protocol name="dubbo" port="20880"/>
<!--
暴露服务接口dubbo:service
interface:暴露服务接口的全限定类名‘
ref:接口引用的实现类在spring容器中的标识
registry:如果不使用注册中心,则值为:N/A
-->
<dubbo:service interface="com.it.dubbo.service.UserService" ref="userService" registry="N/A"/>
<!--将接口的实现类加载到spring容器中-->
<bean id="userService" class="com.it.dubbo.service.impl.UserServiceImpl"/>
</beans>
F 、 创建 web.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:dubbo-userservice-provider.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>
G 、安装本地 jar 到 maven 仓库
服务接口中的方法要给消费者使用,消费者项目需要知道接口名称和接口中的方法名称、参
数等。这些信息服务提供者才知道。需要把接口的 class 文件打包为 jar .
服务接口项目的类文件打包为 jar , 安装到 maven 仓库,仓库中的提供者 jar 可以被消费者
使用。
使用 idea 的 maven 窗口执行 install
本机打包到maven仓库的地址
D:\jsp\Maven\MavenTest\repository\com\it\dubbo\001-link-userservice-provider
(2) 创建服务消费者
A、新建archet-webapp的model
002-link-consumer
B、 maven pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.it.dubbo</groupId>
<artifactId>002-link-comsumer</artifactId>
<version>1.0.0</version>
<packaging>war</packaging>
<dependencies>
<!--spring依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.16.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.3.16.RELEASE</version>
</dependency>
<!--dubbo依赖-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.6.2</version>
</dependency>
<!--依赖服务提供者-->
<dependency>
<groupId>com.it.dubbo</groupId>
<artifactId>001-link-userservice-provider</artifactId>
<version>1.0.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
C 、 创建控制层UserController
package com.it.dubbo.web;
import com.it.dubbo.entity.User;
import com.it.dubbo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class UserController {
@Autowired
private UserService userService;
@RequestMapping(value = "/user")
public String userDetail(Model model,Integer id){
User user = userService.queryUserById(id);
model.addAttribute("user",user);
return "userDetail";
}
}
、 创建 dubbo 配置文件
link-consumer.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:dubbo="http://dubbo.apache.org/schema/dubbo"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd">
<!--声明服务消费者的名称:保证唯一性-->
<dubbo:application name="002-link-consumer"/>
<!--
引用远程服务接口:
id:远程服务接口对象的名称
interface:调用远程接口的全限定类名
url:访问服务接口的地址
registry:不使用注册中心,值为:N/A
-->
<dubbo:reference id="userService" interface="com.it.dubbo.service.UserService"
url="dubbo://localhost:20880" registry="N/A"/>
</beans>
application.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.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--扫描组件-->
<context:component-scan base-package="com.it.dubbo.web"/>
<!--配置注解的驱动-->
<mvc:annotation-driven/>
<!--视图解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
E、 创建web.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:application.xml,classpath:link-consumer.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
F、 创建jsp页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>用户详情</title>
</head>
<body>
</body>
<h1>用户详情</h1>
<div>用户标识:${user.id}</div>
<div>用户名称:${user.name}</div>
<div>用户年龄:${user.age}</div>
</html>
给两个model配置两个tomcat,端口号不能相同
运行结果