版权声明：转载请注明作者：sust_ly https://blog.csdn.net/pycharm_u/article/details/85727570
一、需求分析
实现一个可以完成前后端的基于ssh框架的学生管理系统，要求由老师登录，可以看见老师管理的学生，以及对学生进行增删改查的操作。
二、数据库设计
1、学生表设计
CREATE TABLE `student_info` (
`uuid` varchar(64) NOT NULL,
`name` varchar(20) DEFAULT NULL,
`schoolId` int(11) DEFAULT NULL,
`gender` varchar(20) DEFAULT NULL,
`className` varchar(20) DEFAULT NULL,
`teacherId` varchar(20) DEFAULT NULL,
PRIMARY KEY (`uuid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;学生表保存了学生信息以及其对应老师的ID，由于看了阿里巴巴开发手册，其建议不使用外键，便参考进去。
2、老师表设计
CREATE TABLE `teacher_info` (
`id` varchar(20) NOT NULL,
`password` varchar(30) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;三、技术分析
由struts2作为controller层，控制页面数据的请求与响应，hibernate作为dao层，对数据库做持久化操作，spring整合service层，使用jsp作为前端技术。前端是比较简单的jsp，下面不再赘述。
项目目录架构如下：
四、登陆功能实现
（1）form表单提交到struts2的action中。
<form action="${pageContext.request.contextPath}/teacher_login" method="post">
<div id="login_div">
<h2>用户登录</h2>（2）配置struts2的action
<action name="teacher_login" class="com.sinuonan.controller.LoginAction" method="loginBy">
<result name="success">/student_list.jsp</result>
<result name="error">/login.jsp</result>
</action>（3）action的逻辑代码
@Controller
public class LoginAction extends ActionSupport {
private String id;
private String password;
@Resource(name = "teacherService")
private TeacherService teacherService;
@Resource(name = "StudentService")
private StudentService studentService;
public void setId(String id) {
this.id = id;
}
public void setPassword(String password) {
this.password = password;
}
public String login(){
return SUCCESS;
}
public String loginBy(){
String t_password = teacherService.findPassowrdByid(id);
if (password.equals(t_password)){
List<StudentInfo> list = studentService.findStudentByTeacherid(id);
HttpServletRequest request = ServletActionContext.getRequest();
//teacher登陆成功后将id存入session中
request.getSession().setAttribute("id",id);
request.setAttribute("list",list);
return SUCCESS;
}else {
this.addActionError("用户名或密码错误");
return ERROR;
}
}
}五、增删改查功能实现
增删改查的配置与登陆功能的配置基本类似。
逻辑代码实现：
（1）增加
@Controller
public class addStudentAction extends ActionSupport {
private String name;
private String gender;
private String className;
private Integer schoolId;
@Resource(name = "StudentService")
private StudentService service;
public void setName(String name) {
this.name = name;
}
public void setGender(String gender) {
this.gender = gender;
}
public void setClassName(String className) {
this.className = className;
}
public void setSchoolId(Integer schoolId) {
this.schoolId = schoolId;
}
/**
* 添加学生
* @return
*/
public String addStudent(){
StudentInfo info = new StudentInfo();
info.setClassName(className);
info.setGender(gender);
info.setSchoolId(schoolId);
info.setName(name);
//从session中获得teacher的id
String teacherId = (String) ServletActionContext.getRequest().getSession().getAttribute("id");
info.setTeacherId(teacherId);
info.setUuid(UUID.randomUUID().toString());
service.addStudent(info);
return SUCCESS;
}
public String addStudentGo(){
return SUCCESS;
}
}（2）修改
@Controller
public class updateAction extends ActionSupport {
private String uuid;
private String name;
private String gender;
private String className;
private Integer schoolId;
public void setName(String name) {
this.name = name;
}
public void setGender(String gender) {
this.gender = gender;
}
public void setClassName(String className) {
this.className = className;
}
public void setSchoolId(Integer schoolId) {
this.schoolId = schoolId;
}
public void setUuid(String uuid) {
this.uuid = uuid;
}
@Resource(name = "StudentService")
private StudentService service;
public String update(){
StudentInfo info = new StudentInfo();
info.setSchoolId(schoolId);
info.setUuid(uuid);
info.setGender(gender);
info.setClassName(className);
info.setName(name);
info.setTeacherId((String) ServletActionContext.getRequest().getSession().getAttribute("id"));
service.updateStudent(info);
return SUCCESS;
}
public String updateGo(){
List<StudentInfo> students = service.findStudentByUuid(uuid);
StudentInfo st = students.get(0);
ServletActionContext.getRequest().setAttribute("st",st);
return SUCCESS;
}
}（3）删除
@Controller
public class deleteAction extends ActionSupport {
private String name;
@Resource(name = "StudentService")
private StudentService service;
public void setName(String name) {
this.name = name;
}
public String deleteByName(){
service.deleteStudentByName(name);
return SUCCESS;
}
}（4）查找
@Controller
public class ShowAction extends ActionSupport {
@Resource(name = "StudentService")
private StudentService studentService;
public String showView(){
//从session中获得id，用于查询
String name = (String) ServletActionContext.getRequest().getSession().getAttribute("id");
List<StudentInfo> list = studentService.findStudentByTeacherid(name);
ServletActionContext.getRequest().setAttribute("list",list);
return SUCCESS;
}
}六、dao层的实现
学生dao:
public class StudentDaoImpl extends HibernateDaoSupport implements StudentDao {
public void addStudent(StudentInfo st) {
this.getHibernateTemplate().save(st);
}
public void updateStudent(StudentInfo st) {
this.getHibernateTemplate().update(st);
}
public void deleteStudentByUuid(String uuid) {
List<StudentInfo> list = (List<StudentInfo>) this.getHibernateTemplate().find("from StudentInfo where uuid=?0", uuid);
StudentInfo info = list.get(0);
this.getHibernateTemplate().delete(info);
}
public StudentInfo findStudentByName(String name) {
DetachedCriteria criteria = DetachedCriteria.forClass(StudentInfo.class);
criteria.add(Restrictions.eq("name",name));
List<StudentInfo> list = (List<StudentInfo>) this.getHibernateTemplate().findByCriteria(criteria);
return list.get(0);
}
public List<StudentInfo> findStudentByTeacherid(String id) {
String hql = "from StudentInfo where teacherId=?0";
List<StudentInfo> list = (List<StudentInfo>) this.getHibernateTemplate().find(hql,id);
if (list==null || list.size()==0){
return null;
}else {
return list;
}
}
public void updateStudentByname(String name, Integer schoolId) {
StudentInfo student = findStudentByName(name);
student.setSchoolId(schoolId);
this.getHibernateTemplate().update(student);
}
public void deleteStudentByName(String name) {
StudentInfo student = findStudentByName(name);
this.getHibernateTemplate().delete(student);
}
public List<StudentInfo> findStudentByUuid(String uuid) {
DetachedCriteria criteria = DetachedCriteria.forClass(StudentInfo.class);
criteria.add(Restrictions.eq("uuid",uuid));
List<StudentInfo> list = (List<StudentInfo>) this.getHibernateTemplate().findByCriteria(criteria);
return list;
}
}七、其他的一些细节
1.request.setAttribute在jsp页面无法获取
楼主在配置struts2时，不小心把type配置成redirect，重定向的话，request就失效了，配置成请求转发才行。
2.hibernate除了find方法外其他都报错
没有开启事务，其他三个方法默认为readonly。
<!--定义事务-->
<bean id="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<!--开启事务注解-->
<tx:annotation-driven transaction-manager="transactionManager"/>