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Spring Boot实现SSM整合

article 2024/11/14 11:05:26

6.1 创建工程，导入静态资源

整体目录结构：

编写HTML页面

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<h2>根据ID查询员工数据</h2>
<input type="button" value="点我" onclick="fn01()"/>
<script src="/js/axios-0.18.0.js"></script>
<script>
function fn01(){
axios.get("http://localhost:8080/emp/findById?empId=1").then(function(response){
console.log(response.data);
});
}
</script>
</body>
</html>

6.2 引入依赖

<properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <!--所有的springboot工程需要继承的父工程-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.10.RELEASE</version>
    </parent>
    <dependencies>
    <!--web开发的相关依赖 场景启动器依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.3.0</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.16</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.25</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>

    <!-- SpringBoot应用打包插件-->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
<!--如果运行出现：
Failed to execute goal org.apache.maven.plugins:maven-resourcesplugin:3.2.0:resource
错误就给下面注释解开-->
            <!--<plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <!--修改版本-->
                <version>3.1.0</version>
            </plugin>-->
        </plugins>
    </build>
</project>

6.3 编写配置文件

#配置服务器端口
server:
  port: 8080
  #数据库信息配置
spring:
  datasource:
    class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
    username: root
    password: 123456
    type: com.alibaba.druid.pool.DruidDataSource
  application:
    name: /
  #配置映射配置文件
mybatis:
  configuration:
    map-underscore-to-camel-case: true #驼峰映射
  mapper-locations: classpath:mappers/*.xml
  type-aliases-package: com.ll.pojo

上面的代码复制到yml里面基本配置结构就是这样子：

注意事项：不要去修改黄色代码的位置不要在前面或则后面乱打空格直接复制过去就好了，因为yml对等级区分非常敏感，如果修改黄色代码的位置很容易启动不成功，而且在配置多的情况下还极难发现；

6.4 创建启动类

/**
* @SpringBootApplication 标识是SpringBoot的启动类
* 在引导类上添加 @MapperScan 注解
*/
@SpringBootApplication
@EnableTransactionManagement//开启事务支持
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class,args);
}
}

6.5 创建实体类

Emp实体

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Emp {
private Integer empId;
private String empName;
private Double empSalary;
}

状态信息实体：

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Result {
private int code;//响应状态码
private String msg;//响应消息
private Object data;//响应数据
}

6.6 编写Mapper

编写Mapper接口：

@Mapper
public interface EmpMapper {
public Emp findEmpById(Integer empId);
}

映射配置文件：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.lzw.mapper.EmpMapper">
<!--根据ID查询员工信息-->
<select id="findEmpById" resultType="Emp">
select * from t_emp where emp_id = #{empId}
</select>
</mapper>

6.7 编写Service

Service接口：

public interface EmpService {
public Emp findEmpById(Integer empId);
}

Service实现类：

@Service
@Transactional
public class EmpServiceImpl implements EmpService {
@Autowired
private EmpMapper empMapper;
@Override
public Emp findEmpById(Integer empId) {
return empMapper.findEmpById(empId);
}
}

6.8 编写Controller

表现层代码;

@RestController
//@RestController=@Controller+@ResponseBody
@RequestMapping("/emp")
public class EmpController {
@Autowired
private EmpService empService;
//URL+请求方式
//根据ID查询
@GetMapping("/{empId}")
public Result
findById(@PathVariable("empId") Integer empId){
Emp emp = empService.findEmpById(empId);
Result result = new Result(20000,"查询成功",emp);
return result;
}
}

测一下结果：