文章目录：
1.思路讲解
这个案例其实就是SpringBoot集成SSM、Dubbo、Redis、JSP，看起来集成了一大堆，感觉挺麻烦的，但实际上并不是很麻烦，下面我来说一下我的思路：
- 接口工程：存放实体bean和业务接口
- 服务提供者：它是一个SpringBoot框架web项目，集成MyBatis、Redis
1）pom文件中添加依赖：MyBatis、MySQL驱动、Dubbo、zookeeper、redis、接口工程。
2）配置springboot核心配置文件（连接数据库、连接redis、dubbo、内嵌tomcat）
- 服务消费者：它也是一个SpringBoot框架web项目，集成JSP、Dubbo
1）pom文件中添加依赖：Dubbo、zookeeper、接口工程、解析jsp页面的依赖。
2）配置springboot核心配置文件（dubbo、内嵌tomcat、视图解析器）
文章比较长，因为代码比较多，大家一定要有这个耐心去看完，相信我讲的还是有点用的！！！
2.案例分析
这里SpringBoot集成MyBatis，我用的是MyBatis逆向工程来直接生成的实体bean、dao、mapper，所以这里首先给出MyBatis逆向工程的配置文件。
这个文件主要是负责生成你项目中的实体bean、dao、mapper，那么再加上集成dubbo的情况下，我们的实体bean是需要放在接口工程中的，而dao、mapper则需要放在服务提供者中，所以在MyBatis逆向工程的配置文件中，需要将实体bean的生成位置改为第一个接口工程的绝对路径。数据库这里的表结构和数据，我就不再给出了，大家自行创建一下就可以了。
-
<?xml version="1.0" encoding="UTF-8"?>
-
<!DOCTYPE generatorConfiguration
-
PUBLIC
"-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
-
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
-
<generatorConfiguration>
-
<!-- 指定连接数据库的 JDBC 驱动包所在位置，指定到你本机的完整路径 -->
-
<classPathEntry location="E:\mysql-connector-java-5.1.9.jar"/>
-
<!-- 配置 table 表信息内容体，targetRuntime 指定采用 MyBatis3 的版本 -->
-
<context id="tables" targetRuntime="MyBatis3">
-
<!-- 抑制生成注释，由于生成的注释都是英文的，可以不让它生成 -->
-
<commentGenerator>
-
<property name="suppressAllComments" value="true"/>
-
</commentGenerator>
-
<!-- 配置数据库连接信息 -->
-
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
-
connectionURL=
"jdbc:mysql://localhost:3306/springboot"
-
userId=
"root"
-
password=
"12345678">
-
</jdbcConnection>
-
<!-- 生成 entity 类，targetPackage 指定 entity 类的包名， targetProject指定生成的 entity 放在 IDEA 的哪个工程下面-->
-
<javaModelGenerator targetPackage="com.szh.springboot.entity"
-
targetProject=
"D:\BaiduNetdiskDownload\014-springboot-ssm-dubbo-interface\src\main\java">
-
<property name="enableSubPackages" value="false"/>
-
<property name="trimStrings" value="false"/>
-
</javaModelGenerator>
-
<!-- 生成 MyBatis 的 Mapper.xml 文件，targetPackage 指定 mapper.xml 文件的包名， targetProject 指定生成的 mapper.xml 放在 IDEA 的哪个工程下面 -->
-
<sqlMapGenerator targetPackage="com.szh.springboot.mapper"
-
targetProject=
"src/main/java">
-
<property name="enableSubPackages" value="false"/>
-
</sqlMapGenerator>
-
<!-- 生成 MyBatis 的 Mapper 接口类文件,targetPackage 指定 Mapper 接口类的包名， targetProject 指定生成的 Mapper 接口放在 IDEA 的哪个工程下面 -->
-
<javaClientGenerator type="XMLMAPPER"
-
targetPackage=
"com.szh.springboot.mapper"
-
targetProject=
"src/main/java">
-
<property name="enableSubPackages" value="false"/>
-
</javaClientGenerator>
-
<!-- 数据库表名及对应的 Java 模型类名 -->
-
<table tableName="t_student" domainObjectName="Student"
-
enableCountByExample=
"false"
-
enableUpdateByExample=
"false"
-
enableDeleteByExample=
"false"
-
enableSelectByExample=
"false"
-
selectByExampleQueryId=
"false"/>
-
</context>
-
</generatorConfiguration>
2.1 接口工程
MyBatis逆向工程生成的实体bean。
-
package com.szh.springboot.entity;
-
-
import java.io.Serializable;
-
-
public
class Student implements Serializable {
-
-
private Integer id;
-
-
private String name;
-
-
private Integer age;
-
-
//getter and setter
-
}
接口服务，其中有两个方法。
-
package com.szh.springboot.service;
-
-
import com.szh.springboot.entity.Student;
-
-
/**
-
*
-
*/
-
public
interface StudentService {
-
-
Student queryStudentById(Integer id);
-
-
Integer queryAllStudentCount();
-
}
2.2 服务提供者
SpringBoot核心配置文件
-
# 配置内嵌tomcat端口号和上下文根
-
server.port=
8081
-
server.servlet.context-path=/
-
-
# 设置连接数据库的信息
-
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
-
spring.datasource.url=jdbc:mysql://localhost:
3306/springboot?useUnicode=
true&characterEncoding=UTF-
8&useJDBCCompliantTimezoneShift=
true&useLegacyDatetimeCode=
false&serverTimezone=GMT%
2B8
-
spring.datasource.username=root
-
spring.datasource.password=
12345678
-
-
# 设置dubbo
-
spring.application.name=
015-springboot-ssm-dubbo-provider
-
spring.dubbo.server=
true
-
spring.dubbo.registry=zookeeper://localhost:
2181
-
-
# 设置redis
-
spring.redis.host=localhost
-
spring.redis.port=
6379
MyBatis逆向工程生成的dao接口和对应的mapper映射文件（这里就做一个简单的案例，所以只用到了 selectByPrimaryKey、queryAllStudentCount 这两个方法）
-
package com.szh.springboot.mapper;
-
-
import com.szh.springboot.entity.Student;
-
-
public
interface StudentMapper {
-
-
int deleteByPrimaryKey(Integer id);
-
-
int insert(Student record);
-
-
int insertSelective(Student record);
-
-
Student selectByPrimaryKey(Integer id);
-
-
int updateByPrimaryKeySelective(Student record);
-
-
int updateByPrimaryKey(Student record);
-
-
Integer queryAllStudentCount();
-
-
}
-
<?xml version="1.0" encoding="UTF-8"?>
-
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
-
<mapper namespace="com.szh.springboot.mapper.StudentMapper">
-
-
<resultMap id="BaseResultMap" type="com.szh.springboot.entity.Student">
-
<id column="id" jdbcType="INTEGER" property="id" />
-
<result column="name" jdbcType="VARCHAR" property="name" />
-
<result column="age" jdbcType="INTEGER" property="age" />
-
</resultMap>
-
-
<sql id="Base_Column_List">
-
id, name, age
-
</sql>
-
-
<select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
-
select
-
<include refid="Base_Column_List" />
-
from t_student
-
where id = #{id,jdbcType=INTEGER}
-
</select>
-
-
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
-
delete from t_student
-
where id = #{id,jdbcType=INTEGER}
-
</delete>
-
-
<insert id="insert" parameterType="com.szh.springboot.entity.Student">
-
insert into t_student (id, name, age
-
)
-
values (#{id,jdbcType=INTEGER}, #{name,jdbcType=VARCHAR}, #{age,jdbcType=INTEGER}
-
)
-
</insert>
-
-
<insert id="insertSelective" parameterType="com.szh.springboot.entity.Student">
-
insert into t_student
-
<trim prefix="(" suffix=")" suffixOverrides=",">
-
<if test="id != null">
-
id,
-
</if>
-
<if test="name != null">
-
name,
-
</if>
-
<if test="age != null">
-
age,
-
</if>
-
</trim>
-
<trim prefix="values (" suffix=")" suffixOverrides=",">
-
<if test="id != null">
-
#{id,jdbcType=INTEGER},
-
</if>
-
<if test="name != null">
-
#{name,jdbcType=VARCHAR},
-
</if>
-
<if test="age != null">
-
#{age,jdbcType=INTEGER},
-
</if>
-
</trim>
-
</insert>
-
-
<update id="updateByPrimaryKeySelective" parameterType="com.szh.springboot.entity.Student">
-
update t_student
-
<set>
-
<if test="name != null">
-
name = #{name,jdbcType=VARCHAR},
-
</if>
-
<if test="age != null">
-
age = #{age,jdbcType=INTEGER},
-
</if>
-
</set>
-
where id = #{id,jdbcType=INTEGER}
-
</update>
-
-
<update id="updateByPrimaryKey" parameterType="com.szh.springboot.entity.Student">
-
update t_student
-
set name = #{name,jdbcType=VARCHAR},
-
age = #{age,jdbcType=INTEGER}
-
where id = #{id,jdbcType=INTEGER}
-
</update>
-
-
<select id="queryAllStudentCount" resultType="java.lang.Integer">
-
select count(*)
-
from t_student
-
</select>
-
</mapper>
对接口工程中接口方法的实现，其中包括注入数据库持久层、注入redis模板类对象。
-
package com.szh.springboot.service.impl;
-
-
import com.alibaba.dubbo.config.annotation.Service;
-
import com.szh.springboot.entity.Student;
-
import com.szh.springboot.mapper.StudentMapper;
-
import com.szh.springboot.service.StudentService;
-
import org.springframework.beans.factory.annotation.Autowired;
-
import org.springframework.data.redis.core.RedisTemplate;
-
import org.springframework.stereotype.Component;
-
-
import java.util.concurrent.TimeUnit;
-
-
/**
-
*
-
*/
-
@Component
-
@Service(interfaceClass = StudentService.class,version = "1.0.0",timeout = 15000)
-
public
class StudentServiceImpl implements StudentService {
-
-
@Autowired
-
private StudentMapper studentMapper;
-
-
@Autowired
-
private RedisTemplate<Object,Object> redisTemplate;
-
-
@Override
-
public Student queryStudentById(Integer id) {
-
return studentMapper.selectByPrimaryKey(id);
-
}
-
-
@Override
-
public Integer queryAllStudentCount() {
-
-
//首先去redis缓存中查询，如果有：直接使用；如果没有，去数据库中查询并存放到redis缓存中
-
Integer allStudentCount= (Integer) redisTemplate.opsForValue().get(
"allStudentCount");
-
-
//判断是否有值
-
if (allStudentCount==
null) {
-
//此时为空，则去数据库中查询
-
allStudentCount=studentMapper.queryAllStudentCount();
-
//并存放到redis缓存中
-
redisTemplate.opsForValue().set(
"allStudentCount",allStudentCount,
30, TimeUnit.SECONDS);
-
}
-
return allStudentCount;
-
}
-
-
}
pom文件
-
<dependencies>
-
-
<dependency>
-
<groupId>org.springframework.boot
</groupId>
-
<artifactId>spring-boot-starter-web
</artifactId>
-
</dependency>
-
-
<dependency>
-
<groupId>com.alibaba.spring.boot
</groupId>
-
<artifactId>dubbo-spring-boot-starter
</artifactId>
-
<version>2.0.0
</version>
-
</dependency>
-
-
<dependency>
-
<groupId>org.apache.zookeeper
</groupId>
-
<artifactId>zookeeper
</artifactId>
-
<version>3.4.6
</version>
-
<exclusions>
-
<exclusion>
-
<groupId>org.slf4j
</groupId>
-
<artifactId>slf4j-log4j12
</artifactId>
-
</exclusion>
-
</exclusions>
-
</dependency>
-
<dependency>
-
<groupId>com.101tec
</groupId>
-
<artifactId>zkclient
</artifactId>
-
<version>0.4
</version>
-
</dependency>
-
-
<dependency>
-
<groupId>org.mybatis.spring.boot
</groupId>
-
<artifactId>mybatis-spring-boot-starter
</artifactId>
-
<version>2.1.4
</version>
-
</dependency>
-
-
<dependency>
-
<groupId>mysql
</groupId>
-
<artifactId>mysql-connector-java
</artifactId>
-
<version>5.1.9
</version>
-
</dependency>
-
-
<dependency>
-
<groupId>org.springframework.boot
</groupId>
-
<artifactId>spring-boot-starter-data-redis
</artifactId>
-
</dependency>
-
-
<!-- 接口工程 -->
-
<dependency>
-
<groupId>com.szh.springboot
</groupId>
-
<artifactId>014-springboot-ssm-dubbo-interface
</artifactId>
-
<version>1.0.0
</version>
-
</dependency>
-
-
</dependencies>
-
-
<build>
-
-
<resources>
-
<resource>
-
<directory>src/main/java
</directory>
-
<includes>
-
<include>**/*.xml
</include>
-
</includes>
-
</resource>
-
</resources>
-
-
<plugins>
-
<plugin>
-
<groupId>org.springframework.boot
</groupId>
-
<artifactId>spring-boot-maven-plugin
</artifactId>
-
</plugin>
-
-
<!--mybatis 代码自动生成插件-->
-
<plugin>
-
<groupId>org.mybatis.generator
</groupId>
-
<artifactId>mybatis-generator-maven-plugin
</artifactId>
-
<version>1.3.7
</version>
-
<configuration>
-
<!--配置文件的位置-->
-
<configurationFile>GeneratorMapper.xml
</configurationFile>
-
<verbose>true
</verbose>
-
<overwrite>true
</overwrite>
-
</configuration>
-
</plugin>
-
</plugins>
-
</build>
SpringBoot项目启动入口类
-
package com.szh.springboot;
-
-
import com.alibaba.dubbo.spring.boot.annotation.EnableDubboConfiguration;
-
import org.mybatis.spring.annotation.MapperScan;
-
import org.springframework.boot.SpringApplication;
-
import org.springframework.boot.autoconfigure.SpringBootApplication;
-
-
@SpringBootApplication
-
@MapperScan(basePackages = "com.szh.springboot.mapper")
-
@EnableDubboConfiguration
-
public
class Application {
-
-
public static void main(String[] args) {
-
SpringApplication.run(Application.class, args);
-
}
-
-
}
2.3 服务消费者
SpringBoot核心配置文件
-
# 配置内嵌tomcat端口号和上下文根
-
server.port=
8080
-
server.servlet.context-path=/
-
-
# 设置dubbo
-
spring.application.name=
016-springboot-ssm-dubbo-consumer
-
spring.dubbo.registry=zookeeper://localhost:
2181
-
-
# 配置视图解析器
-
spring.mvc.view.prefix=/
-
spring.mvc.view.suffix=.jsp
定义控制层，其中有两个请求方法
-
package com.szh.springboot.controller;
-
-
import com.alibaba.dubbo.config.annotation.Reference;
-
import com.szh.springboot.entity.Student;
-
import com.szh.springboot.service.StudentService;
-
import org.springframework.stereotype.Controller;
-
import org.springframework.ui.Model;
-
import org.springframework.web.bind.annotation.GetMapping;
-
import org.springframework.web.bind.annotation.PathVariable;
-
import org.springframework.web.bind.annotation.RequestMapping;
-
import org.springframework.web.bind.annotation.ResponseBody;
-
-
/**
-
*
-
*/
-
@Controller
-
public
class StudentController {
-
-
@Reference(interfaceClass = StudentService.class,version = "1.0.0",check = false)
-
private StudentService studentService;
-
-
@RequestMapping(value = "/student/detail/{id}")
-
public String studentDetail(@PathVariable("id") Integer id,
-
Model model) {
-
Student student=studentService.queryStudentById(id);
-
model.addAttribute(
"student",student);
-
return
"studentDetail";
-
}
-
-
@GetMapping(value = "/student/all/count")
-
public
@ResponseBody
Object allStudentCount() {
-
Integer allStudentCount=studentService.queryAllStudentCount();
-
return
"学生总人数为：" + allStudentCount;
-
}
-
-
}
pom文件
-
<dependencies>
-
-
<dependency>
-
<groupId>org.springframework.boot
</groupId>
-
<artifactId>spring-boot-starter-web
</artifactId>
-
</dependency>
-
-
<dependency>
-
<groupId>com.alibaba.spring.boot
</groupId>
-
<artifactId>dubbo-spring-boot-starter
</artifactId>
-
<version>2.0.0
</version>
-
</dependency>
-
-
<dependency>
-
<groupId>org.apache.zookeeper
</groupId>
-
<artifactId>zookeeper
</artifactId>
-
<version>3.4.6
</version>
-
<exclusions>
-
<exclusion>
-
<groupId>org.slf4j
</groupId>
-
<artifactId>slf4j-log4j12
</artifactId>
-
</exclusion>
-
</exclusions>
-
</dependency>
-
<dependency>
-
<groupId>com.101tec
</groupId>
-
<artifactId>zkclient
</artifactId>
-
<version>0.4
</version>
-
</dependency>
-
-
<dependency>
-
<groupId>org.apache.tomcat.embed
</groupId>
-
<artifactId>tomcat-embed-jasper
</artifactId>
-
</dependency>
-
-
<!-- 接口工程 -->
-
<dependency>
-
<groupId>com.szh.springboot
</groupId>
-
<artifactId>014-springboot-ssm-dubbo-interface
</artifactId>
-
<version>1.0.0
</version>
-
</dependency>
-
-
</dependencies>
-
-
<build>
-
-
<resources>
-
<resource>
-
<directory>src/main/webapp
</directory>
-
<targetPath>META-INF/resources
</targetPath>
-
<includes>
-
<include>*.*
</include>
-
</includes>
-
</resource>
-
</resources>
-
-
<plugins>
-
<plugin>
-
<groupId>org.springframework.boot
</groupId>
-
<artifactId>spring-boot-maven-plugin
</artifactId>
-
</plugin>
-
</plugins>
-
</build>
响应的jsp页面、SpringBoot项目启动入口类
-
<%@ page contentType="text/html;charset=utf-8" language="java" %>
-
<html>
-
<head>
-
<title>$
</title>
-
</head>
-
<body>
-
<h3>学生信息
</h3>
-
<div>学生编号：${student.id}
</div>
-
<div>学生姓名：${student.name}
</div>
-
<div>学生年龄：${student.age}
</div>
-
</body>
-
</html>
-
package com.szh.springboot;
-
-
import com.alibaba.dubbo.spring.boot.annotation.EnableDubboConfiguration;
-
import org.springframework.boot.SpringApplication;
-
import org.springframework.boot.autoconfigure.SpringBootApplication;
-
-
@SpringBootApplication
-
@EnableDubboConfiguration
-
public
class Application {
-
-
public static void main(String[] args) {
-
SpringApplication.run(Application.class, args);
-
}
-
-
}
2.4 启动测试！！！
因为我们这个案例是SpringBoot集成SSM、Dubbo、Redis、JSP，同时使用注册中心。所以启动的步骤是：
- 启动zookeeper注册中心 zkServer.cmd（我这里为了考虑电脑性能，所以直接就在Windows上启动了，推荐是在Linux上启动）
- 启动redis服务（redis-server.exe redis,windows.conf 、 redis-cli.exe -h 127.0.0.1 -p 6379）
- 启动服务提供者（对应该工程的SpringBoot项目启动入口类）
- 启动服务消费者（对应该工程的SpringBoot项目启动入口类）
测试结果中，可以看到，第一个请求结果拿到了学生信息，第二个请求结果也查询出了学生数量，而且我们开启redis服务之后，可以看到发起第二个请求之后，redis缓存中已经有了这个 allStudentCount 数据，经过30秒之后，这个数据会被清除。
转载：https://blog.csdn.net/weixin_43823808/article/details/117384025
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