SSM 小demo（很详细，适合新手）

自己做了一个基于SSM框架的小项目，跟大家分享一下..

首先，你需要开发工具netbeans或者eclipse一枚，我习惯用netbeans,这个随意，mysql数据库，

此为前提条件，因为是小项目，所以需求分析和用例图暂免了吧，有兴趣可以画。下面正式开始

先看一下大概的项目分层

看一眼jar包及JSP页面

我习惯先于数据库下手，然后映射数据库和pojo类，然后配置文件，然后dao->service层，控制器和jsp页面看需求

1）创建一个 student_clazz表，也就是学生-教室-老师表，涉及表与表之间的关系，老师与学生之间为多对多的关系，即一个学生有多个老师，化学啦生物啦，一个老师也有很多学生；教室与学生之间为一对多的关系，即一间教室有多位学生（假定在这个教室的这些学生只在这一个教室上课），人物关系介绍完毕~

至于主外键，为数据库基础不再赘述

CREATE DATABASE student_clazzUSE student_clazzCREATE TABLE Clazz(
C_Id INT PRIMARY KEY NOT NULL,
C_Address VARCHAR(20)
);
INSERT INTO Clazz VALUES(1,'博知');
INSERT INTO Clazz VALUES(2,'静思');
INSERT INTO Clazz VALUES(3,'博文');
INSERT INTO Clazz VALUES(4,'博学');CREATE TABLE Student(
S_Id INT PRIMARY KEY NOT NULL,
S_Name VARCHAR(20),
S_Gender VARCHAR(20),
S_Age VARCHAR(20),
clazz_id INT,
FOREIGN KEY (clazz_id) REFERENCES Clazz(C_Id)
);
INSERT INTO Student VALUES(10111,'anna','女','18',2);
INSERT INTO Student VALUES(10222,'juin','男','12',1);
INSERT INTO Student VALUES(10333,'edwina','女','11',1);
INSERT INTO Student VALUES(10444,'david','男','14',2);CREATE TABLE Teacher(
T_Id INT PRIMARY KEY NOT NULL,
T_Name VARCHAR(20) NOT NULL,
T_Type VARCHAR(20) NOT NULL,
T_Gender VARCHAR(20) NOT NULL,
T_Age VARCHAR(20) NOT NULL,
T_Mobile INT
);INSERT INTO Teacher VALUES(2201,'里番番','数学','女','21',279376);
INSERT INTO Teacher VALUES(22002,'大卫','语文','男','22',279326);
INSERT INTO Teacher VALUES(22003,'卡瑟琳','英语','女','23',279326);
INSERT INTO Teacher VALUES(22004,'鲁迅','NIIT','男','24',279326);CREATE TABLE ItemOne(
student_id INT,
teacher_id INT,
PRIMARY KEY(student_id,teacher_id),
FOREIGN KEY(student_id) REFERENCES Student(S_Id),
FOREIGN KEY(teacher_id) REFERENCES Teacher(T_Id)
);
INSERT INTO ItemOne VALUES(20111,22003);
INSERT INTO ItemOne VALUES(20111,2201);
INSERT INTO ItemOne VALUES(20111,22002);
INSERT INTO ItemOne VALUES(30332,22004);
INSERT INTO ItemOne VALUES(30332,22002);
INSERT INTO ItemOne VALUES(20221,22003);
INSERT INTO ItemOne VALUES(20221,22004);

2）再做pojo类和数据库的映射

先建三个pojo类，有人问为什么要继承Serializable，其实我们在自己电脑上做程序的时候可以不用写，
它可以把对象转换成字节流在网络上传输，如果你不写自然没法传输，那程序也就没法使用
然后挨个写映射文件，这个对数据库的熟练还是有点要求的，增删改查相关操作都写在映射文件里，

association是用来映射一对一的关系及多对一的关系，collection用来映射一对多和多对多的关系，具体

方法如下

（和hibernate的区别参考上一篇博文。这些增删改查的语句的引用都在dao包的实现类里，通过sqlSession

提供的方法具体操作。）

1>Clazz

public class Clazz implements Serializable {private int clazzId;private String clazzAddress;private List<Student> students;public int getClazzId() {return clazzId;}public void setClazzId(int clazzId) {this.clazzId = clazzId;}public String getClazzAddress() {return clazzAddress;}public void setClazzAddress(String clazzAddress) {this.clazzAddress = clazzAddress;}public List<Student> getStudents() {return students;}public void setStudents(List<Student> students) {this.students = students;}@Overridepublic String toString() {return "Clazz{" + "clazzId=" + clazzId + ", clazzAddress=" + clazzAddress + ", students=" + students + '}';}}

，与它匹配的映射文件

<?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.qdu.mapping.ClazzMapper"><select id="selectClazzById" resultMap="ClazzResultMap" parameterType="int">select * from Clazz where C_Id= #{clazzId}</select><resultMap id="ClazzResultMap" type="com.qdu.pojo.Clazz"><id property="clazzId" column="C_Id"/><result property="clazzAddress" column="C_Address"/>   <!--下面有个column是“C_Id”，我个人的理解是这个为当前表的主键做了另一个表的外键，起到一个关联作用,这是提供给另一个表的--><collection property="students" javaType="ArrayList" column="C_Id" ofType="com.qdu.pojo.Student" select="com.qdu.mapping.StudentMapper.selectStudentByClazzId"><id property="stuId" column="S_Id"/><result property="stuName" column="S_Name"/><result property="stuGender" column="S_Gender"/><result property="stuAge" column="S_Age"/></collection></resultMap></mapper>

2>Student

public class Student implements Serializable{private int stuId;private String stuName;private String stuGender;private String stuAge;private Clazz clazz;private List<Teacher> teachers;public int getStuId() {return stuId;}public void setStuId(int stuId) {this.stuId = stuId;}public String getStuName() {return stuName;}public void setStuName(String stuName) {this.stuName = stuName;}public String getStuGender() {return stuGender;}public void setStuGender(String stuGender) {this.stuGender = stuGender;}public String getStuAge() {return stuAge;}public void setStuAge(String stuAge) {this.stuAge = stuAge;}public Clazz getClazz() {return clazz;}public void setClazz(Clazz clazz) {this.clazz = clazz;}public List<Teacher> getTeachers() {return teachers;}public void setTeachers(List<Teacher> teachers) {this.teachers = teachers;}@Overridepublic String toString() {return "Student{" + "stuId=" + stuId + ", stuName=" + stuName + ", stuGender=" + stuGender + ", stuAge=" + stuAge + ", clazz=" + clazz + ", teachers=" + teachers + '}';}}

，Student的映射文件为

<?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.qdu.mapping.StudentMapper"><!--之所以会用到两个表我认为是因为在数据库中Student表中引用了clazz--><select id="selectStudentById" resultMap="StudentResultMap" parameterType="int">select * from Student s,Clazz cwhere s.clazz_id = c.C_Id And s.S_id = #{stuId}</select><select id="selectStudentByClazzId" resultMap="StudentResultMap" parameterType="int">select * from Student where clazz_id = #{C_id}</select><select id="selectStudentByTeacherId" resultMap="StudentResultMap" parameterType="int">select * from Student where S_Id in (select student_id from ItemOne where teacher_id = #{T_Id} )</select><insert id="insertStudent" parameterType="com.qdu.pojo.Student">INSERT INTO Student(S_Id,S_Name,S_Gender,S_Age,clazz_id) VALUES (#{stuId},#{stuName},#{stuGender},#{stuAge},#{clazz.clazzId});</insert><update id="updateStudent" parameterType="com.qdu.pojo.Student" statementType="PREPARED">update Student setS_Name=#{stuName},S_Gender=#{stuGender},S_Age=#{stuAge},clazz_id=#{clazz.clazzId}where S_Id = #{stuId}</update><delete id="deleteStudentById" parameterType="com.qdu.pojo.Student">delete from Student where S_Id = #{stuId}</delete><resultMap id="StudentResultMap" type="com.qdu.pojo.Student"><id property="stuId" column="S_Id"/><result property="stuName" column="S_Name"/><result property="stuGender" column="S_Gender"/><result property="stuAge" column="S_Age"/><!--多对一--><association property="clazz" javaType="com.qdu.pojo.Clazz"><id property="clazzId" column="C_Id"/><result property="clazzAddress" column="C_Address"/></association><!--多对多--><collection property="teachers" javaType="ArrayList" column="S_Id" ofType="com.qdu.pojo.Teacher" select="com.qdu.mapping.TeacherMapper.selectTeacherByStudentId"><id property="teacherId" column="T_Id"/><result property="teacherName" column="T_Name"/><result property="teacherType" column="T_Type"/><result property="teacherGender" column="T_Gender"/><result property="teacherAge" column="T_Age"/><result property="teacherMobile" column="T_Mobile"/></collection></resultMap></mapper>

3>Teacher

public class Teacher implements Serializable {private int teacherId;private String teacherName;private String teacherType;private String teacherGender;private String teacherAge;private int teacherMobile;private List<Student> students;public int getTeacherId() {return teacherId;}public void setTeacherId(int teacherId) {this.teacherId = teacherId;}public String getTeacherName() {return teacherName;}public void setTeacherName(String teacherName) {this.teacherName = teacherName;}public String getTeacherType() {return teacherType;}public void setTeacherType(String teacherType) {this.teacherType = teacherType;}public String getTeacherGender() {return teacherGender;}public void setTeacherGender(String teacherGender) {this.teacherGender = teacherGender;}public String getTeacherAge() {return teacherAge;}public void setTeacherAge(String teacherAge) {this.teacherAge = teacherAge;}public int getTeacherMobile() {return teacherMobile;}public void setTeacherMobile(int teacherMobile) {this.teacherMobile = teacherMobile;}public List<Student> getStudents() {return students;}public void setStudents(List<Student> students) {this.students = students;}}

，映射文件为

<?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.qdu.mapping.StudentMapper"><!--之所以会用到两个表我认为是因为在数据库中Student表中引用了clazz--><select id="selectStudentById" resultMap="StudentResultMap" parameterType="int">select * from Student s,Clazz cwhere s.clazz_id = c.C_Id And s.S_id = #{stuId}</select><select id="selectStudentByClazzId" resultMap="StudentResultMap" parameterType="int">select * from Student where clazz_id = #{C_id}</select><select id="selectStudentByTeacherId" resultMap="StudentResultMap" parameterType="int">select * from Student where S_Id in (select student_id from ItemOne where teacher_id = #{T_Id} )</select><insert id="insertStudent" parameterType="com.qdu.pojo.Student">INSERT INTO Student(S_Id,S_Name,S_Gender,S_Age,clazz_id) VALUES (#{stuId},#{stuName},#{stuGender},#{stuAge},#{clazz.clazzId});</insert><update id="updateStudent" parameterType="com.qdu.pojo.Student" statementType="PREPARED">update Student setS_Name=#{stuName},S_Gender=#{stuGender},S_Age=#{stuAge},clazz_id=#{clazz.clazzId}where S_Id = #{stuId}</update><delete id="deleteStudentById" parameterType="com.qdu.pojo.Student">delete from Student where S_Id = #{stuId}</delete><resultMap id="StudentResultMap" type="com.qdu.pojo.Student"><id property="stuId" column="S_Id"/><result property="stuName" column="S_Name"/><result property="stuGender" column="S_Gender"/><result property="stuAge" column="S_Age"/><!--多对一--><association property="clazz" javaType="com.qdu.pojo.Clazz"><id property="clazzId" column="C_Id"/><result property="clazzAddress" column="C_Address"/></association><!--多对多--><collection property="teachers" javaType="ArrayList" column="S_Id" ofType="com.qdu.pojo.Teacher" select="com.qdu.mapping.TeacherMapper.selectTeacherByStudentId"><id property="teacherId" column="T_Id"/><result property="teacherName" column="T_Name"/><result property="teacherType" column="T_Type"/><result property="teacherGender" column="T_Gender"/><result property="teacherAge" column="T_Age"/><result property="teacherMobile" column="T_Mobile"/></collection></resultMap></mapper>

3）接下来就是配置文件，重头戏

配置文件分为Spring-mybatis配置文件和Spring MVC配置文件

Spring-mybatis配置文件的作用就是作为持久层框架起一个水渠的作用。

<?xml version='1.0' encoding='UTF-8' ?>
<!-- was: <?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:p="http://www.springframework.org/schema/p"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-4.0.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd"
><context:component-scan base-package="com.qdu"/><bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver" /><property name="url" value="jdbc:mysql://localhost:3306/student_clazz" /><property name="username" value="sa" /><property name="password" value="niit" /></bean><bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><property name="dataSource" ref="dataSource"/><property name="mapperLocations" value="classpath:com/qdu/mapping/*.xml"/></bean><bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><property name="dataSource" ref="dataSource"/></bean><tx:annotation-driven transaction-manager="txManager"/></beans>

Spring MVC配置文件作为请求分发器用来分发请求到制定的控制器

<?xml version='1.0' encoding='UTF-8' ?>
<!-- was: <?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:p="http://www.springframework.org/schema/p"xmlns:aop="http://www.springframework.org/schema/aop"xmlns:tx="http://www.springframework.org/schema/tx"xmlns:mvc="http://www.springframework.org/schema/mvc"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsdhttp://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"
><context:component-scan base-package="com.qdu.controller"/><mvc:annotation-driven/><mvc:default-servlet-handler/>   <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"id="internalResourceViewResolver"><!-- 前缀 --><property name="prefix" value="/WEB-INF/jsp/"/><!-- 后缀 --><property name="suffix" value=".jsp" /></bean></beans>

4）再就是配置web.xml了，把两个配置文件向项目向程序说明一下

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"><context-param><param-name>contextConfigLocation</param-name><param-value>/WEB-INF/applicationContext.xml</param-value></context-param><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><servlet><servlet-name>dispatcher</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--         <init-param>Servlet范围内的参数<param-name>contextConfigLocation</param-name><param-value>classpath:dispatcher-servlet.xml</param-value></init-param>--><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>dispatcher</servlet-name><url-pattern>*.do</url-pattern></servlet-mapping><session-config><session-timeout>30</session-timeout></session-config><welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list>
</web-app>

5）我习惯dao和service都写接口再实现，这是个好习惯，符合框架低耦合的观念，这次例外，dao接口没写，

可以自己补上。

@Repository用于标注数据访问组件,即DAO组件

statement为mapper文件中的具体的sql语句

@Repository
public class StudentDao {@Autowiredprivate SqlSessionFactory sqlSessionFactory;public List studentList(int clazzId){String statement="com.qdu.mapping.StudentMapper.selectStudentByClazzId";return sqlSessionFactory.openSession().selectList(statement, clazzId);}public List selectTeacherByStudentId(int stuId){String statement = "com.qdu.mapping.TeacherMapper.selectTeacherByStudentId";return sqlSessionFactory.openSession().selectList(statement, stuId);}public Student selectStudentById(int stuId) {String statement = "com.qdu.mapping.StudentMapper.selectStudentById";System.out.println(sqlSessionFactory);return sqlSessionFactory.openSession().selectOne(statement, stuId);}public Clazz selectClazzById(int clazzId) {String statement = "com.qdu.mapping.ClazzMapper.selectClazzById";return sqlSessionFactory.openSession().selectOne(statement, clazzId);}public void insertStudent(Student student){String statement="com.qdu.mapping.StudentMapper.insertStudent";sqlSessionFactory.openSession().insert(statement, student);}public void updateStudent(Student student){String statement="com.qdu.mapping.StudentMapper.updateStudent";sqlSessionFactory.openSession().update(statement, student);}public void deleteStudent(int stuId){String statement="com.qdu.mapping.StudentMapper.deleteStudentById";sqlSessionFactory.openSession().delete(statement, stuId);}public Teacher selectTeacherById(int teacherId){String statement="com.qdu.mapping.TeacherMapper.selectTeacherById";return sqlSessionFactory.openSession().selectOne(statement,teacherId);}}

Service接口：

public interface StudentService {public Student getStudentById(int stuId);public List selectTeacherByStudentId(int stuId);public Clazz getClazzById(int clazzId);public void insertStudent(Student student);public void updateStudent(Student student);public void deleteStudent(int stuId);public List studentList(int clazzId);public Teacher selectTeacherById(int teacherId);}

@Transactional为Spring的事务注解,表示该类里面的所有方法或者这个方法的事务由spring处理,
来保证事务的原子性, 每一个业务方法开始时都会打开一个事务,这样的好处，可以省去一些XML
配置文件的繁琐编写
@Transactional 注解应该只被应用到 public 方法上，这是由 Spring AOP 的本质决定的。如果你在 protected、private 或者默认可见性的方法上使用 @Transactional 注解，这将被忽略，也不会抛出任何异常。

默认情况下，只有来自外部的方法调用才会被AOP代理捕获，也就是，类内部方法调用本类内部的其他方法并不会引起事务行为，即使被调用方法使用@Transactional注解进行修饰。

事务管理对于企业应用来说是至关重要的，即使出现异常情况，它也可以保证数据的一致性

@Service为Spring的service注解，标注服务类

//为什么要用接口？！
//第一种方式：建立个接口
//第二种方式：直接实例化
//第一种：比如你用Spring框架，可以在用到UserServiceImpl的时候定义接口，最后使用XML方式实例化，这样以后需要修改，只要改xml(所谓的低耦合)
//第二种：假设你直接在java文件中直接实例化，万一你不在用这个类了，要用另外的类来代替，需要改java文件，很麻烦（即所谓的低内聚高耦合）
//耦合度低的程序要好@Transactional
@Service("studentServiceImpl")
public class StudentServiceImpl implements StudentService {@Autowiredprivate StudentDao studentDao;@Overridepublic Student getStudentById(int stuId) {
//        System.out.println(studentDao.selectStudentById(10111));return studentDao.selectStudentById(stuId);}@Overridepublic Clazz getClazzById(int clazzId) {System.out.println(studentDao.selectClazzById(1));return studentDao.selectClazzById(clazzId);}@Overridepublic void insertStudent(Student student) {studentDao.insertStudent(student);}@Overridepublic void updateStudent(Student student) {studentDao.updateStudent(student);}@Overridepublic void deleteStudent(int stuId) {studentDao.deleteStudent(stuId);}@Overridepublic List studentList(int clazzId) {return studentDao.studentList(clazzId);}@Overridepublic List selectTeacherByStudentId(int stuId) {return studentDao.selectTeacherByStudentId(stuId);}@Overridepublic Teacher selectTeacherById(int teacherId) {return studentDao.selectTeacherById(teacherId);}}

@Controller控制器注解，用于处理多个URL请求@RequestMapping 可以标注在类定义处，将 Controller 和特定请求关联起来；还可以标注在方法签名处，以便进一步对请求进行分流

@Controller
@RequestMapping(value = "/anna")
public class TestController {@Autowiredprivate StudentService studentServiceImpl;//调用父类的方法，再调用子类中的方法@RequestMapping(value = "/student.do")public String studentLogin(ModelMap map) {return "student";}@RequestMapping(value = "/admin.do")public String teacherLogin(ModelMap map) {return "admin";}@RequestMapping(value = "/juin.do")public String queryStudent(HttpServletRequest request, ModelMap map) {int id = Integer.parseInt(request.getParameter("stuId"));int password = Integer.parseInt(request.getParameter("password"));Student student = studentServiceImpl.getStudentById(id);System.out.println(student);
//        int转String验证可以＋""啊if (student != null && (id + "") != null && (password + "") != null && id == student.getStuId() && password == 123) {map.addAttribute("student", student);return "success";} else {return "fail";}}@RequestMapping(value = "/adminLogin.do")public String teacherLoginDo(HttpServletRequest request, ModelMap map) {int id = Integer.parseInt(request.getParameter("id"));int password = Integer.parseInt(request.getParameter("password"));Clazz clazz = studentServiceImpl.getClazzById(id);if (id == clazz.getClazzId() && password == 123) {map.addAttribute("clazz", clazz);return "adminSuccess";} else {return "fail";}}@RequestMapping(value = "forInsertStudent.do")public String forInsertStudent(ModelMap map, int clazzId, HttpServletRequest request) {clazzId = Integer.parseInt(request.getParameter("clazzId"));Clazz clazz = studentServiceImpl.getClazzById(clazzId);Date time = new Date(System.currentTimeMillis());SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");String current = sdf.format(time);Random random = new Random();int cc=Integer.parseInt(current);int x = random.nextInt(900) + 100;System.out.println(cc);map.addAttribute("clazz", clazz);map.addAttribute("date", cc);map.addAttribute("random", x);return "insertStudent";}@RequestMapping(value = "insertStudent.do")public String insertStudent(HttpServletRequest request, ModelMap map, Student student) {studentServiceImpl.insertStudent(student);int id = Integer.parseInt(request.getParameter("clazz.clazzId"));Clazz clazz = studentServiceImpl.getClazzById(id);map.addAttribute("clazz", clazz);return "adminSuccess";}@RequestMapping(value = "forUpdateStudent.do")public String forUpdateStudent(HttpServletRequest request, ModelMap map) {int id = Integer.parseInt(request.getParameter("stuId"));Student student = studentServiceImpl.getStudentById(id);map.addAttribute("student", student);return "updateStudent";}@RequestMapping(value = "updateStudent.do")public String updateStudent(ModelMap map, Student student, int stuId) {studentServiceImpl.updateStudent(student);student = studentServiceImpl.getStudentById(stuId);Clazz clazz = studentServiceImpl.getClazzById(student.getClazz().getClazzId());map.addAttribute("clazz", clazz);return "adminSuccess";}@RequestMapping(value = "forDeleteStudent.do")public String forDeleteStudent(HttpServletRequest request, ModelMap map) {int id = Integer.parseInt(request.getParameter("stuId"));Student student = studentServiceImpl.getStudentById(id);map.addAttribute("student", student);return "deleteStudent";}//    clazzId来源于前端的传值，免去request，是不是很有趣？另外，逻辑语句要有先有后，第n次逻辑颠倒@RequestMapping(value = "deleteStudent.do")public String deleteStudent(ModelMap map, int clazzId, int stuId, Student student, Clazz clazz) {studentServiceImpl.deleteStudent(stuId);clazz = studentServiceImpl.getClazzById(clazzId);map.addAttribute("clazz", clazz);return "adminSuccess";}@RequestMapping(value = "teacher.do")public String teacher() {return "teacher";}@RequestMapping(value = "teacherLogin.do")public String teacherLogin(ModelMap map, HttpServletRequest request) {int teacherId = Integer.parseInt(request.getParameter("teacherId"));int password = Integer.parseInt(request.getParameter("password"));Teacher teacher = studentServiceImpl.selectTeacherById(teacherId);if (teacherId == teacher.getTeacherId() && password == 123) {//                for (int i = 0; i < teacher.getStudents().size(); i++) {
//                Student student = studentServiceImpl.getStudentById(teacher.getStudents().get(i).getStuId());map.addAttribute("teacher", teacher);
//                map.addAttribute("sss", student);//                }return "teacherSuccess";} else {return "fail";}}@RequestMapping(value = "firstPage.do")public String firstPage() {return "translate";}
}

最后就是页面了，JSP页面与JSTL以及EL表达式相结合，足够满足一般需求

页面很多，贴出最主要的一两个

首页

不同身份登录

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>首页</title></head><body><form><h2>登录身份选择</h2><a href="anna/student.do">Student</a><a href="anna/teacher.do">Teacher</a><a href="anna/admin.do">Admin</a></form></body>
</html>

教师登录

<%-- Document   : teacherCreated on : 2017-4-27, 16:50:03Author     : ACER
--%><%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>教师登录</title></head><body><form action="teacherLogin.do">教师账号: <input type="text" name="teacherId" placeholder="在此输入账号"/><br/><br/>教师密码: <input type="password" name="password" placeholder="在此输入密码"/><br/><br/><input type="submit" value="提交"/></form></body>
</html>

登录成功页面

<%-- Document   : teacherSuccessCreated on : 2017-4-27, 17:59:20Author     : ACER
--%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>教师登录成功</title></head><body><h2>登录成功-<code style="color: #00CC00">${teacher.teacherName}</code>老师</h2><table border="2"><caption>学生列表</caption><tr><th>学生Id</th><th>学生姓名</th><th>学生性别</th><th>学生年龄</th><!--<th>学生教室</th>--></tr><c:forEach items="${teacher.students}" var="s"><tr id="${s.stuId}" ><td>${s.stuId}</td><td>${s.stuName}</td><td>${s.stuGender}</td><td>${s.stuAge}</td></tr></c:forEach></table></body>
</html>

运行结果

此为结束，欢迎大家提出问题，共同探讨

____Juin

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前言

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