SSM框架快速搭建（四）

心已赠人 2024-04-07 11:31 92阅读 0赞

### 12、在resources下log4j.properties配置文件 ###

log4j.properties文件内容：（设置log的打印级别）

###  把日志信息输出到控制台  ###
    log4j.appender.stdout=org.apache.log4j.ConsoleAppender
    log4j.appender.stdout.layout=org.apache.log4j.SimpleLayout
    ###  设置优先级别、以及输出源 ###
    log4j.rootLogger=debug,stdout

### 13、编写业务代码 ###

先给出结构目录，防止出现错误

![1bb798965b864facaa0cffcd65a384d9.png][]

#### 13.1、controller下的内容： ####

ClassesController.java内容：

package com.aaa.ssm.controller;
    
    
    import com.aaa.ssm.entity.Classes;
    import com.aaa.ssm.service.ClassesService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    import java.util.List;
    
    
    @Controller
    @RequestMapping("classes")
    public class ClassesController {
        @Autowired
        private ClassesService classesService;
    
        @RequestMapping("findClasses")
        public String findClasses(Model model) {
            List<Classes> list = classesService.findClasses();
            model.addAttribute("claList", list);
            return "showClasses";
        }
    
        @RequestMapping("addClasses")
        public String addClasses(Classes classes, Model model) {
            classesService.addClasses(classes);
            model.addAttribute("msg", "班级录入成功！");
            return findClasses(model);
        }
    }

StudentController.java内容：

package com.aaa.ssm.controller;
    
    import com.aaa.ssm.entity.Student;
    import com.aaa.ssm.service.StudentService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    import java.util.List;
    
    @Controller
    @RequestMapping("stu")
    public class StudentController {
        @Autowired
        private StudentService studentService;
    
        @RequestMapping("findStu")
        public String findStu(Model model) {
            List<Student> list = studentService.findAllStudent();
            model.addAttribute("list", list);
            return "showStu";
        }
    
        @RequestMapping("addStu")
        public String addStu(Student student, Model model) {
            studentService.addStudent(student);
            model.addAttribute("msg", "学生信息录入成功！");
            return findStu(model);
        }
    }

#### 13.2、 service下的内容： ####

ClassesService.java接口：

package com.aaa.ssm.service;
    
    
    import com.aaa.ssm.entity.Classes;
    import org.springframework.stereotype.Service;
    
    import java.util.List;
    
    
    public interface ClassesService {
    
        public List<Classes> findClasses();
    
        public void addClasses(Classes classes);
    }

ClassesServiceImpl.java实现类：

package com.aaa.ssm.service.serviceImpl;
    
    import com.aaa.ssm.dao.ClassesMapper;
    import com.aaa.ssm.entity.Classes;
    import com.aaa.ssm.service.ClassesService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import org.springframework.transaction.annotation.Isolation;
    import org.springframework.transaction.annotation.Propagation;
    import org.springframework.transaction.annotation.Transactional;
    
    import java.util.List;
    
    @Service
    public class ClassesServiceImpl implements ClassesService {
        @Autowired
        private ClassesMapper classesMapper;
    
        @Override
        @Transactional(isolation = Isolation.DEFAULT,propagation = Propagation.REQUIRED)
        public void addClasses(Classes classes) {
            classesMapper.insert(classes);
        }
    
        @Override
        @Transactional(isolation = Isolation.DEFAULT,propagation = Propagation.SUPPORTS)
        public List<Classes> findClasses() {
            return classesMapper.selectAll();
        }
    }

StudentService.java接口：

package com.aaa.ssm.service;
    
    import com.aaa.ssm.entity.Student;
    import org.springframework.stereotype.Service;
    
    import java.util.List;
    
    
    public interface StudentService {
        public void addStudent(Student student);
    
        public List<Student> findAllStudent();
    }

StudentServiceImpl.java实现类：

package com.aaa.ssm.service.serviceImpl;
    
    import com.aaa.ssm.dao.StudentMapper;
    import com.aaa.ssm.entity.Student;
    import com.aaa.ssm.service.StudentService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    import java.util.List;
    
    
    @Service
    public class StudentServiceImpl implements StudentService {
        @Autowired
        private StudentMapper studentMapper;
    
        @Override
        public void addStudent(Student student) {
            studentMapper.insert(student);
        }
    
        @Override
        public List<Student> findAllStudent() {
            return studentMapper.selectAll();
        }
    }

#### 13.3 dao下内容 ####

ClassesMapper接口内容：

package com.aaa.ssm.dao;
    
    import com.aaa.ssm.entity.Classes;
    
    import java.util.List;
    
    public interface ClassesMapper {
        int deleteByPrimaryKey(Integer classId);
    
        int insert(Classes record);
    
        int insertSelective(Classes record);
    
        Classes selectByPrimaryKey(Integer classId);
    
        int updateByPrimaryKeySelective(Classes record);
    
        int updateByPrimaryKey(Classes record);
    
        List<Classes> selectAll();
    }

StudentMapper接口内容：

package com.aaa.ssm.dao;
    
    import com.aaa.ssm.entity.Student;
    
    import java.util.List;
    
    public interface StudentMapper {
        int deleteByPrimaryKey(Integer stuId);
    
        int insert(Student record);
    
        int insertSelective(Student record);
    
        Student selectByPrimaryKey(Integer stuId);
    
        int updateByPrimaryKeySelective(Student record);
    
        int updateByPrimaryKey(Student record);
    
        List<Student> selectAll();
    
    
    }

#### 13.4、在resources.config.mybatis.mapper下编写selectAll查询语句（只给出截图） ####

ClassesMapper.xml里

![8ce450dad67449bfbd2d350924ce6cc0.png][]

StudentMapper.xml里

![e3555aea209546afbe4a5f464a9fbcca.png][]

[1bb798965b864facaa0cffcd65a384d9.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/07/5bd612706c094ba7bb6897609b261968.png
[8ce450dad67449bfbd2d350924ce6cc0.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/07/fb57e27b9fe2421aa8d2d55b766f661c.png
[e3555aea209546afbe4a5f464a9fbcca.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/07/f834c4e4743a47f1b95d10a8864bdf3d.png