实验09 Spring MVC框架：SSM框架整合 2021.6.6

实验09 Spring MVC框架：SSM框架整合

【实验目的及要求】

掌握SSM框架整合方法；
完成成绩管理系统的课程管理模块；
基于SSM框架的系统设计方法。

【实验步骤】

1、 SSM框架整合（学生信息管理模块）

（1）在Eclipse中新建Web项目gms（Grade Management System），配置好Tomcat运行环境，启动MySQL数据库服务，并将jsp文件的默认编码调整为UTF-8。

（2）登录MySQL数据库，执行下列SQL脚本。

-- student数据库创建示例

create database student character set gbk;

use student;

-- 设计客户端默认字符集

SET @saved_cs_client = @@character_set_client;

SET @@character_set_client = gbk;

-- 含指定引擎和默认字符集

create table stu(

sno char(9) primary key,

sname varchar(30) not null,

ssex char(2) not null,

snative varchar(30),

mno int

)ENGINE=InnoDB DEFAULT CHARSET=gbk;

set names gbk;

insert into stu values('100000001','尚小云','女','广东广州',1);

insert into stu values('100000002','廖时飞','男','广东梅州',1);

insert into stu values('100000003','宋凌枫','男','湖南郴州',2);

insert into stu values('100000004','刘小纳', '女','广东佛山',2);

create table course(

cno int primary key,

cname varchar(50) not null,

period int

)ENGINE=InnoDB DEFAULT CHARSET=gbk;

set names gbk;

insert into course values(1,'高等数学',80);

insert into course values(2,'大学英语',70);

insert into course values(3,'数据结构',70);

insert into course values(4,'数据库原理与应用',70);

create table teacher(

tno int primary key,

tname varchar(24) not null,

tsex char(2) not null,

tel varchar(20)

)ENGINE=InnoDB DEFAULT CHARSET=gbk;

set names gbk;

insert into teacher values(1,'袁怀斌','男','13590909090');

insert into teacher values(2,'杨文远','男','13588888888');

insert into teacher values(3,'周云霞','女','13511118888');

create table sc(

sno char(9),

cno int,

tno int,

participation float,

final float,

total float,

constraint fk_sc_stu foreign key(sno) references stu(sno),

constraint fk_sc_course foreign key(cno) references course(cno),

constraint fk_sc_teacher foreign key(tno) references teacher(tno),

constraint pk_sc primary key(sno,cno,tno)

)ENGINE=InnoDB DEFAULT CHARSET=gbk;

set names gbk;

insert into sc values('100000001',1,1,80,87,85);

insert into sc values('100000001',2,2,85,75,81);

insert into sc values('100000002',1,1,78,82,80);

-- 恢复客户端默认字符集

SET @@character_set_client = @saved_cs_client;

（3）将libs文件夹中所有的jar文件复制到/WEB-INF/lib目录中，并在Eclipse中刷新该目录。

（4）在WebContent目录中新建系统首页index.jsp，提供进入学生信息管理的超链接，内容如下。

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>成绩管理系统（GMS）</title>

</head>

<body>

<a href="studentlist">学生信息管理</a>

</body>

</html>

（5）在/WEB-INF/jsp/student目录下，新建studentlist.jsp文件，提供学生信息的列表显示，以及学生信息的添加、删除和更新操作，内容如下。

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>学生信息列表</title>

function frmSubmit(){

document.form1.submit();

}

</script>

</head>

<body>

<tr>

</tr>

<c:forEach items="${studentList}" var="student">

<tr>

<td>${student.sno}</td>

<td>${student.sname}</td>

<td>${student.ssex}</td>

<td>${student.snative}</td>

<td>${student.mno}</td>

<td>

</td>

</tr>

</c:forEach>

</table>

</form>

</body>

</html>

说明：该网页中用到了JSTL，因此需要使用标签<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>导入标签库。

（6）在/WEB-INF/jsp/student目录下，新建文件，提供学生信息的修改表单，内容如下。

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<title>修改学生信息</title>

</head>

<body>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

</table>

</form>

</body>

</html>

（7）在/WEB-INF/jsp/student目录下，新建studentadd.jsp文件，提供添加学生信息的表单，内容如下。

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<title>添加学生信息</title>

</head>

<body>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

</table>

</form>

</body>

</html>

（8）在/WEB-INF目录中，添加web.xml，提供创建Spring容器、编码过滤器及Spring MVC前端控制器的配置信息，内容如下。

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

<display-name>gms</display-name>

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

<context-param>

<param-name>contextConfigLocation</param-name>

<param-value>classpath:applicationContext.xml</param-value>

</context-param>

<listener-class>

org.springframework.web.context.ContextLoaderListener

</listener-class>

</listener>

<filter-name>encoding</filter-name>

<filter-class>

org.springframework.web.filter.CharacterEncodingFilter

</filter-class>

<init-param>

<param-name>encoding</param-name>

<param-value>UTF-8</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>encoding</filter-name>

<url-pattern>*</url-pattern>

</filter-mapping>

<servlet-name>gms</servlet-name>

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<init-param>

<param-name>contextConfigLocation</param-name>

<param-value>classpath:springmvc-config.xml</param-value>

</init-param>

<load-on-startup>1</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>gms</servlet-name>

<url-pattern>/</url-pattern>

</servlet-mapping>

</web-app>

（9）在src目录中，添加Spring框架的配置文件applicationContext.xml，提供数据源、事务、Mybatis会话工厂、mapper扫描器及bean扫描器等配置信息，内容如下。

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:aop="http://www.springframework.org/schema/aop"

xmlns:tx="http://www.springframework.org/schema/tx"

xmlns:context="http://www.springframework.org/schema/context"

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-4.3.xsd

http://www.springframework.org/schema/tx

http://www.springframework.org/schema/tx/spring-tx-4.3.xsd

http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context-4.3.xsd

http://www.springframework.org/schema/aop

http://www.springframework.org/schema/aop/spring-aop-4.3.xsd">

<context:property-placeholder location="classpath:db.properties"/>

</bean>

<bean id="transactionManager" class=

"org.springframework.jdbc.datasource.DataSourceTransactionManager">

</bean>

<tx:annotation-driven transaction-manager="transactionManager"/>

</bean>

</bean>

<context:component-scan base-package="com.service" />

</beans>

说明：上述配置文件中引用的db.properties文件也要放在src目录中，内容如下。

jdbc.driver=com.mysql.jdbc.Driver

jdbc.url=jdbc:mysql://localhost:3306/student?characterEncoding=GBK

jdbc.username=root

jdbc.password=root

jdbc.maxTotal=30

jdbc.maxIdle=10

jdbc.initialSize=5

（10）在src目录中，添加Mybatis配置文件mybatis-config.xml，添加别名配置信息，内容如下。

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"

"http://mybatis.org/dtd/mybatis-3-config.dtd">

</typeAliases>

</configuration>

（11）在src目录中，添加Spring MVC配置文件springmvc-config.xml，添加控制器扫描及视图解析器配置信息，内容如下。

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:mvc="http://www.springframework.org/schema/mvc"

xmlns:context="http://www.springframework.org/schema/context"

xmlns:tx="http://www.springframework.org/schema/tx"

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-4.3.xsd

http://www.springframework.org/schema/mvc

http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd

http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context-4.3.xsd">

<context:component-scan base-package="com.controller" />

<mvc:annotation-driven />

<bean class=

"org.springframework.web.servlet.view.InternalResourceViewResolver">

</bean>

</beans>

（12）在com.po包中，添加实体类Student，代码如下。

package com.po;

public class Student {

private String sno;

private String sname;

private String ssex;

private String snative;

private int mno;

// 省略了Getter和Setter方法

}

（13）在com.service包中，添加接口StudentService，其方法用于实现学生信息管理。

package com.service;

import java.util.List;

import com.po.Student;

public interface StudentService {

List<Student> findAllStudent();

Student findStudentBySno(String sno);

void addStudent(Student student);

void deleteStudents(String[] snoArray);

void updateStudent(Student student);

}

（14）在com.service.impl包中，添加接口的实现类，代码如下。

package com.service.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

import org.springframework.transaction.annotation.Transactional;

import com.mapper.StudentMapper;

import com.po.Student;

import com.service.StudentService;

@Service

@Transactional

public class StudentServiceImpl implements StudentService{

@Autowired

private StudentMapper studentMapper;

public List<Student> findAllStudent(){

return studentMapper.selectStudents();

}

public Student findStudentBySno(String sno){

return studentMapper.selectStudentBySno(sno);

}

public void addStudent(Student student){

studentMapper.insertStudent(student);

}

public void deleteStudents(String[] snoArray){

for (int i = 0; i < snoArray.length; i ++){

studentMapper.deleteStudentBySno(snoArray[i]);

}

public void updateStudent(Student student){

studentMapper.updateStudent(student);

}

（15）在com.mapper包中，添加接口StudentMapper，提示对数据表stu的基本访问方法。

package com.mapper;

import java.util.List;

import com.po.Student;

public interface StudentMapper {

Student selectStudentBySno(String sno);

List<Student> selectStudentBySname(String sname);

List<Student> selectStudents();

void insertStudent(Student student);

void updateStudent(Student student);

void deleteStudentBySno(String sno);

}

（16）在com.mapper包中，添加stu表的映射文件，内容如下。

<?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">

select * from stu where sno=#{sno};

</select>

select * from stu

<where>

and sname like #{sname}

</if>

</where>

</select>

select * from stu;

</select>

insert into stu(sno,sname,ssex,snative,mno) values(#{sno},#{sname},#{ssex},#{snative},#{mno});

</insert>

delete from stu where sno=#{sno};

</delete>

update stu

<set>

sname=#{sname},

</if>

ssex=#{ssex},

</if>

snative=#{snative},

</if>

mno=#{mno},

</if>

</set>

where sno=#{sno};

</update>

</mapper>

（17）在com.controller包中，添加控制器类StudentController，实现学生信息的添加、删除和更新操作，内容如下。

package com.controller;

import java.util.List;

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 org.springframework.web.bind.annotation.RequestMethod;

import com.po.Student;

import com.service.StudentService;

@Controller

public class StudentController {

@Autowired

private StudentService studentService;

@RequestMapping("/studentlist")

public String studentList(Model model) {

List<Student> list = studentService.findAllStudent();

model.addAttribute("studentList", list);

return "student/studentlist";

}

@RequestMapping(value="/studentpreinsert",method=RequestMethod.GET)

public String studentPreinsert() {

return "student/studentadd";

}

@RequestMapping(value="/studentinsert", method=RequestMethod.POST)

public String studentInsert(Student student){

studentService.addStudent(student);

return "redirect:studentlist";

}

@RequestMapping(value="/studentdelete", method=RequestMethod.POST)

public String studentDelete(String[] snoArray) {

studentService.deleteStudents(snoArray);

return "redirect:studentlist";

}

@RequestMapping(value="/studentpreupdate", method=RequestMethod.GET)

public String studentPreupdate(Student student, Model model) {

model.addAttribute("student", student);

return "student/studentupdate";

}

@RequestMapping(value="/studentupdate", method=RequestMethod.POST)

public String studentUpdate(Student student) {

studentService.updateStudent(student);

return "redirect:studentlist";

}

（18）在Web环境中测试程序的有效性。

（19）模仿上述过程，在gms项目中，添加课程信息管理模块，主要内容如下。

courselist.jsp文件内容：

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>课程信息列表</title>
    <script>
        function frmSubmit(){
            document.form2.submit();
        }
    </script>
</head>
<body>
<center>课程信息</center>
<form id="form2" name="form2" method="post" action="coursedelete">
    <table align="center" width="500" border="1" cellspacing="0" cellpadding="0" style="border-collapse:collapse" bordercolor="#0099FF">
        <tr>
            <td>选择</td>
            <td>课号</td>
            <td>课名</td>
            <td>课时</td>
            <td>书号</td>
            <td>操作  <a href="coursepreinsert">添加</a>  <a href="#" onclick="javascript:frmSubmit();">删除</a></td>
        </tr>
        <c:forEach items="${courseList}" var="course">
            <tr>
                <td><input type="checkbox" name="cnoArray" value="${course.cno}"></td>
                <td>${course.cno}</td>
                <td>${course.cname}</td>
                <td>${course.period}</td>
                <td>
                    <a href="coursepreupdate?cno=${course.cno}&cname=${course.cname}&period=${course.period}">修改</a>
                </td>
            </tr>
        </c:forEach>
    </table>
</form>
</body>
</html>

Courseadd.jsp文件内容：

<%--
Created by IntelliJ IDEA.
User: Bili
Date: 2021/6/6
Time: 18:36
To change this template use File | Settings | File Templates.
--%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>添加课程信息</title>
</head>
<body>
<form id="form2" name="form2" method="post" action="courseinsert">
    <table align="center" width="500" border="1" cellspacing="0" cellpadding="0" style="border-collapse:collapse" bordercolor="#0099FF">
        <tr>
            <td width="116" height="30" align="right" valign="middle">课号：</td>
            <td width="378" align="left" valign="middle">
                <input type="text" name="cno" id="cno" /></td>
        </tr>
        <tr>
            <td width="116" height="30" align="right" valign="middle">课名：</td>
            <td width="378" align="left" valign="middle">
                <input type="text" name="cname" id="cname" /></td>
        </tr>
        <tr>
            <td width="116" height="30" align="right" valign="middle">课时：</td>
            <td width="378" align="left" valign="middle">
                <input type="text" name="period" id="period" /></td>
        </tr>
        <tr>
            <td height="30" align="right" valign="middle"> </td>
            <td align="left" valign="middle"><input type="submit" name="button" id="button" value="提交" />
                <input type="reset" name="button2" id="button2" value="重置" /></td>
        </tr>
    </table>
</form>
</body>
</html>

Courseupdate.jsp文件内容：

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>修改课程信息</title>
</head>
<body>
<form id="form2" name="form2" method="post" action="courseupdate">
    <table align="center" width="500" border="1" cellspacing="0" cellpadding="0" style="border-collapse:collapse" bordercolor="#0099FF">
        <tr>
            <td width="116" height="30" align="right" valign="middle">课号：</td>
            <td width="378" align="left" valign="middle">
                <input type="text" name="cno" readonly="readonly" id="cno" value="${course.cno}"/></td>
        </tr>
        <tr>
            <td width="116" height="30" align="right" valign="middle">课名：</td>
            <td width="378" align="left" valign="middle">
                <input type="text" name="cname" id="cname" value="${course.cname}"/></td>
        </tr>
        <tr>
            <td width="116" height="30" align="right" valign="middle">课时：</td>
            <td width="378" align="left" valign="middle">
                <input type="text" name="period" id="period" value="${course.period}" /></td>
        </tr>
        <tr>
            <td height="30" align="right" valign="middle"> </td>
            <td align="left" valign="middle"><input type="submit" name="button" id="button" value="提交" />
                <input type="reset" name="button2" id="button2" value="重置" /></td>
        </tr>
    </table>
</form>
</body>
</html>

实体类Course代码：

package com.po;

public class Course {
    String cname;
    int cno;
    int period;

    public String getCname() {
        return cname;
    }

    public void setCname(String cname) {
        this.cname = cname;
    }

    public int getCno() {
        return cno;
    }

    public void setCno(int cno) {
        this.cno = cno;
    }

    public int getPeriod() {
        return period;
    }

    public void setPeriod(int period) {
        this.period = period;
    }
}

业务层接口CourseService代码：

package com.service;
import com.po.Course;
import java.util.List;

public interface CourseService {
    List<com.po.Course> findAllCourse();
    com.po.Course findCourseByCno(int cno);
    void addCourse(com.po.Course course);
    void deleteCourses(int[] cnoArray);
    void updateCourse(com.po.Course course);
}

接口CourseService的实现类CourseServiceImpl代码：

package com.service.impl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.mapper.CourseMapper;
import com.po.Course;
import com.service.CourseService;

@Service
@Transactional
public class CourseServiceImpl implements CourseService{
    @Autowired
    private CourseMapper courseMapper;

    public List<Course> findAllCourse(){
        return courseMapper.selectCourses();
    }
    public Course findCourseByCno(int cno){
        return courseMapper.selectCourseByCno(cno);
    }
    public void addCourse(Course course){
        courseMapper.insertCourse(course);
    }
    public void deleteCourses(int[] cnoArray){
        for (int i = 0; i < cnoArray.length; i ++){
            courseMapper.deleteCourseByCno(cnoArray[i]);
        }
    }
    public void updateCourse(Course course){
        courseMapper.updateCourse(course);
    }
}

映射文件CourseMapper.xml内容：

<?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.mapper.CourseMapper">
    
    <select id="selectCourseByCno" parameterType="int" resultType="Course">
      select * from course where cno=#{cno};
   </select>
    
    <select id="selectCourseByCname" parameterType="String" resultType="Course">
        <bind name="cname" value="'%'+cname+'%'" />
        select * from course
        <where>
            <if test="cname!=null and cname!=''">
                and cname like #{cname}
            </if>
        </where>
    </select>
    
    <select id="selectCourses" resultType="Course">
      select * from course;
   </select>
    <insert id="insertCourse" parameterType="Course">
      insert into course(cno,cname,period) values(#{cno},#{cname},#{period});
   </insert>
    <delete id="deleteCourseByCno" parameterType="int">
      delete from course where cno=#{cno};
   </delete>
    <update id="updateCourse" parameterType="Course">
        update course
        <set>
            <if test="cname!=null and cname!=''">
                cname=#{cname},
            </if>
            <if test="period!=null and period!=''">
                period=#{period},
            </if>
        </set>
        where cno=#{cno};
    </update>
</mapper>

接口CourseMapper代码：

package com.mapper;
import java.util.List;
import com.po.Course;

public interface CourseMapper {
    Course selectCourseByCno(int cno);
    List<Course> selectCourseByCname(String cname);
    List<Course> selectCourses();
    void insertCourse(Course course);
    void updateCourse(Course course);
    void deleteCourseByCno(int cno);
}

控制器CourseController代码：

package com.controller;
import java.util.List;
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 org.springframework.web.bind.annotation.RequestMethod;
import com.po.Course;
import com.service.CourseService;

@Controller
public class CourseController {
    @Autowired
    private CourseService courseService;

    @RequestMapping("/courselist")
    public String courseList(Model model) {
        List<Course> list = courseService.findAllCourse();
        model.addAttribute("courseList", list);
        return "course/courselist";
    }

    @RequestMapping(value="/coursepreinsert",method=RequestMethod.GET)
    public String coursePreinsert() {
        return "course/courseadd";
    }

    @RequestMapping(value="/courseinsert", method=RequestMethod.POST)
    public String courseInsert(Course course){
        courseService.addCourse(course);
        return "redirect:courselist";
    }

    @RequestMapping(value="/coursedelete", method=RequestMethod.POST)
    public String courseDelete(int[] cnoArray) {
        courseService.deleteCourses(cnoArray);
        return "redirect:courselist";
    }

    @RequestMapping(value="/coursepreupdate", method=RequestMethod.GET)
    public String coursePreupdate(Course course, Model model) {
        model.addAttribute("course", course);
        return "course/courseupdate";
    }

    @RequestMapping(value="/courseupdate", method=RequestMethod.POST)
    public String courseUpdate(Course course) {
        courseService.updateCourse(course);
        return "redirect:courselist";
    }
}

（20）根据上述实验步骤，归纳总结在SSM框架中，实现Web系统各模块功能的基本思路。

1.写出想要实现的功能并且展示在相关页面中（功能要能实现）

2.根据1中写出的功能编写相关功能的jsp页面

3.在web.xml中配置好SSM应该要用到的配置，配置好applicationContext.xml,

配置好mybatis-config.xml, springmvc-config.xml,切记将要用到的jar包全部导入

4.编写数据层的类,要符合数据库中的数据类型,要符合数据库中表的数据类型

5.编写Service和Mapper和Controller，完成.

其中service层写的是具体业务实现，通常一个service对应着一个业务模块，而一个service有两部分组成，一个是接口，一个是实现类, controller层主要调用Service层里面的接口控制具体的业务流程，控制的配置也要在配置文件中进行。Controller和Service的区别是：Controller负责具体的业务模块流程的控制；Service层负责业务模块的逻辑应用设计

DataBase ===> Entity ===> Mapper.xml ===> Dao.Java ===> Service.java ===> Controller.java ===> 页面.

posted @ 2021-06-06 20:17 WriteOnce_layForever 阅读(900) 评论(0) 编辑收藏举报

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