SpringBoot下搭建SSM框架开发web网站（一）

SpringBoot下搭建SSM框架

项目总体框架图 QQ截图20191009003619.png 一、创建一个新的工程 选择默认 —> next （基本点next就可以） QQ截图20191008232841.png
建议改一下项目名 QQ截图20191008233741.png
勾选自己所需的功能 QQ截图20191008233851.png 其它的就点next就行了 IDEA自动生成项目后，在pom.xml文件中的 dependencies下会有如下几项 QQ截图20191009000155.png

接下来就是上代码

1、 在实体包 domain 下创建一个实体 Student

public class Student {
    private int id;
    private String name;
    private int money;


    public Student() {
    }

    public Student(String name, int money) {
        this.name = name;
        this.money = money;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getMoney() {
        return money;
    }

    public void setMoney(int money) {
        this.money = money;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", money=" + money +
                '}';
    }
}

2、在包 dao 下建一个接口 IStudentDao

import com.example.springboot_ssm.domain.Student;
import org.apache.ibatis.annotations.*;
import org.springframework.stereotype.Repository;

import java.util.List;

@Mapper
@Repository
public interface IStudentDao {

    //增
    @Insert("Insert into students(name,money) values(#{name},#{money})")
    void add(Student student);

    //删
    @Delete("DELETE FROM students WHERE id=#{id}")
    void delete(int id);

    //改
    @Update("UPDATE students SET name=#{name} , money=#{money} WHERE id=#{id}")
    void update(Student student);

    //查
    @Select("SELECT * FROM students where id =#{id}")
    Student query(int id);

    @Select("SELECT * FROM students")
    List<Student> queryall();


}

3、在包 service下建一个 StudentService 接口 和它的实现类 StudentServiceImpl

StudentService 代码

import com.example.springboot_ssm.domain.Student;

import java.util.List;


public interface StudentService {

    void add(Student student);

    void delete(int id);

    Student query(int id);

    List<Student> queryall();

    void update(Student student);

    boolean transfer_accounts(int from,int to,int money);

    boolean transfer_accounts2(int from,int to,int money);
}

StudentServiceImpl 代码

import com.example.springboot_ssm.dao.IStudentDao;
import com.example.springboot_ssm.domain.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;


@Service
@Transactional   //申明要用事务   也可以写在方法上
public class StudentServiceImpl implements StudentService {

    @Autowired
    private IStudentDao iStudentDao;


    @Override
    public void add(Student student) {
        iStudentDao.add(student);
    }

    @Override
    public void delete(int id) {
        iStudentDao.delete(id);
    }

    @Override
    public Student query(int id) {
        Student query = iStudentDao.query(id);
        return query;
    }

    @Override
    public List<Student> queryall() {
        List<Student> queryall = iStudentDao.queryall();
        return queryall;
    }

    @Override
    public void update(Student student) {
        iStudentDao.update(student);
    }

    /**
     * 模拟正常转账
     * @param from
     * @param to
     * @param money
     * @return
     */
    @Override
    public boolean transfer_accounts(int from,int to,int money) {
        Student query_from = iStudentDao.query(from);
        Student query_to = iStudentDao.query(to);
        query_from.setMoney(query_from.getMoney() - money);
        query_to.setMoney(query_to.getMoney()+money);
        iStudentDao.update(query_from);
        iStudentDao.update(query_to);

        return true;
    }

    /**
     * 模拟异常转账
     * @param from
     * @param to
     * @param money
     * @return
     */
    @Override
    public boolean transfer_accounts2(int from, int to, int money) {
            Student query_from = iStudentDao.query(from);
            Student query_to = iStudentDao.query(to);
            query_from.setMoney(query_from.getMoney() - money);
            query_to.setMoney(query_to.getMoney()+money);
            iStudentDao.update(query_to);
            iStudentDao.update(query_from);
            int i=1/0;
        return true;
    }
}

4、在包 controller下建一个 StudentController 类

import java.util.List;


@RestController
public class StudentController {

    @Autowired
    private StudentService studentService;

    @RequestMapping("test")
    public String test(){
        return "测试成功";
    }

    @RequestMapping("add")
    public String add(){
        Student student = new Student();

        student.setName("新添加");
        student.setMoney(200);

        studentService.add(student);
        return "添加成功";
    }

    @RequestMapping("delete")
    public String delete(int id){
        studentService.delete(id);
        return "删除成功";
    }

    @RequestMapping("query")
    public Student query(int id){
        Student query = studentService.query(id);
        return query;
    }

    @RequestMapping("queryall")
    public List<Student> queryall(){
        List<Student> queryall = studentService.queryall();
        return queryall;
    }

    @RequestMapping("update")
    public String update(){
        Student student = new Student();
        student.setId(3);
        student.setName("更改为3");
        studentService.update(student);
        return "更新成功";
    }

    @RequestMapping("t_a")  //模拟正常
    public boolean transfer_accounts(int from,int to,int money){
        boolean b = studentService.transfer_accounts(from, to, money);
        return b;
    }

    @RequestMapping("t_a2")   //模拟异常
    public boolean transfer_accounts2(int from,int to,int money){
        boolean b = studentService.transfer_accounts2(from, to, money);
        return b;
    }
}

在启动类 SpringbootSsmApplication 开启事务管理 用 EnableTransactionManagement注解

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.transaction.annotation.EnableTransactionManagement;


@EnableTransactionManagement   //开启事务管理
@SpringBootApplication
public class SpringbootSsmApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootSsmApplication.class, args);
    }

}

代码就这么多了，最后就是配置信息，在application.properties下

#服务器端口号
server.port=80

#配置数据源
#我用的mysql是8.0以上，driver和url可能会和版本5的不一样，我觉得应该也可以用吧
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/springboot_ssm?characterEncoding=utf-8 & serverTimezone=UTC & useSSL=false & allowPublicKeyRetrieval=TRUE
spring.datasource.username=root
spring.datasource.password=12345678

#mybatis映射
mybatis.type-aliases-package=com.example.springboot_ssm.domain

#配置日志  日志可要可不要
#显示执行与数据库相关操作的日志
logging.level.com.example.springboot_ssm.dao=debug
#日志文件路径
logging.path=/
#创建一个日志文件，名为stu.log，把日志存到文件中
logging.file=stu.log

最后启动项目就OK了