SSM|maven创建项目,SpringBoot配置SSM开发环境
Github项目地址:https://github.com/githubgxr/news
传统的SSM配置方式有多个配置文件,如:spring-config.xml、springMVC-servlet.xml、web.xml。但是,使用SpringBoot配置SSM时,可以不用配置这些文件,只要有一个启动类。
使用SpringBoot配置SSM开发环境步骤如下:
1 使用maven创建项目
项目结构如下:
2 配置pom.xml导入依赖
springboot依赖(内置了tomcat依赖):
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.0.0</version>
</dependency>
springmvc依赖:
<!--spring framework包括:spring、springmvc-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
mybatis依赖:
<!--mybatis springboot starter-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.0.0</version>
</dependency>
jdbc依赖:
<!--jdbc-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
数据库连接驱动类依赖:
<!--mysql连接驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
整个pom.xml文件内容:
<?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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.gxr</groupId>
<artifactId>news</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>news</name>
<description>News system project for Spring Boot</description>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<!--页面模板引擎:thymeleaf,类似jsp-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<!--jdbc-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!--spring framework:spring\springmvc-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--mybatis springboot starter-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.0.0</version>
</dependency>
<!--springboot开发工具,支持热部署-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<version>2.1.3.RELEASE</version>
</dependency>
<!--mysql连接驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!--springboot 测试-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
thymeleaf(springboot官方推荐的)模板引擎(类似于jsp模板)依赖(所以可以不用再引入servlet、jsp依赖):
<!--页面模板引擎:thymeleaf,类似jsp-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
springboot开发工具依赖:
<!--springboot开发工具,支持热部署-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<version>2.1.3.RELEASE</version>
</dependency>
springboot开发工具作用:项目修改可以不用重新开始启动类,只要重新构建项目(build project)即可应用修改。
3 配置application.properties
# tomcat访问端口
server.port=80
logging.level.org.springframework=DEBUG
#springboot mybatis
#加载mybatis配置文件
mybatis.mapper-locations = classpath:mapper/*Mapper.xml
mybatis.config-location = classpath:mybatis-config.xml
#数据库表对应实体类所在包
mybatis.type-aliases-package = com.gxr.news.DO
#数据源配置
spring.datasource.driver-class-name= com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/newssys?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf-8
spring.datasource.username = root
spring.datasource.password = root
#thymelea模板配置
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.suffix=.html
spring.thymeleaf.mode=HTML5
spring.thymeleaf.encoding=UTF-8
#热部署文件,页面不产生缓存,及时更新
spring.thymeleaf.cache=false
spring.resources.chain.strategy.content.enabled=true
spring.resources.chain.strategy.content.paths=/**
4 测试SSM开发环境:
4.1 创建数据库
4.1 创建实体类
package com.gxr.news.DO;
public class testDO {
private Integer id;
private String name;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
@Override
public String toString() {
return "testDO{" +
"id=" + id +
", name='" + name + '\'' +
'}';
}
public void setName(String name) {
this.name = name;
}
}
4.3 创建访问数据库 @Mapper 注解的接口
package com.gxr.news.mapper;
import com.gxr.news.DO.testDO;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import java.util.List;
@Mapper
public interface testDOMapper {
@Select("select * from test")
public List<testDO> listTestDOs();
}
4.4 创建服务层接口
package com.gxr.news.test.service;
import com.gxr.news.DO.testDO;
import java.util.List;
public interface TestService {
public List<testDO> listTestDOs();
}
4.5 创建 @Service 注解的服务层接口实现类
package com.gxr.news.test.service.impl;
import com.gxr.news.DO.testDO;
import com.gxr.news.mapper.testDOMapper;
import com.gxr.news.test.service.TestService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class TestServiceImpl implements TestService {
@Autowired
private testDOMapper mapper;
@Override
public List<testDO> listTestDOs() {
return mapper.listTestDOs();
}
}
4.6 创建 @Controller 注解的控制器类
package com.gxr.news.test.controller;
import com.gxr.news.DO.testDO;
import com.gxr.news.test.service.TestService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;
import java.util.List;
@RestController
public class TestController {
@Autowired
private TestService testService;
@RequestMapping("/all")
public ModelAndView all(Model model) {
// 数据库查询的数据
List<testDO> testDOs = testService.listTestDOs();
model.addAttribute("testDOs", testDOs);
// test/users实际指的是:resources/templates/test/users.html,这个页面就是返回浏览器的页面
return new ModelAndView("test/users","model",model);
}
}
4.7 在resources/templates/test目录下创建users.html
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8" />
<title>用户列表</title>
</head>
<body>
<h1>用户列表:</h1>
<table border="1px solid">
<thead>
<tr>
<th>id</th>
<th>name</th>
</tr>
</thead>
<tbody th:each="testDO:${testDOs}">
<tr>
<td th:text="${testDO.id}"></td>
<td th:text="${testDO.name}"></td>
</tr>
</tbody>
</table>
</body>
</html>
4.8 创建 @SpringBootApplication 注解的启动类
package com.gxr.news;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.gxr.news.mapper")
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
注意: “启动类可能扫描不到访问数据库的”问题
解决方法: 在启动类的 @SpringBootApplication 下面再加一个 @MapperScan 注解在启动类上。
4.8 运行启动类测试
浏览器访问:http://localhost:80/all,结果如下:
数据库数据如下:
结果一致,开发环境配置正确。
5 总结
与传统SSM配置方式相比,使用Springboot配置SSM十分方便,只有一个application.properties配置文件。