======
1.登录系统
2.查询教师信息
3.添加教师信息
4.修改教师信息
三、部分代码
======
AdminDaoImpl
package com.sjsq.dao.impl;
import com.sjsq.dao.AdminDao;
import com.sjsq.utils.DBUtil;
import com.sjsq.vo.Admin;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
/**
-
@author: shuijianshiqing
-
@date: 2021-12-31
-
@description: 登录系统实现
*/
public class AdminDaoImpl implements AdminDao {
/**
-
登录系统
-
@param admin
-
@return
*/
@Override
public Admin login(Admin admin) {
Connection con = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
// 1.获取数据库连接
con = DBUtil.getConnection();
// 2.写sql
String sql = “select * from admin where username = ? and password = ?”;
// 3.预编译
ps = con.prepareStatement(sql);
// 4.设置值
ps.setObject(1, admin.getUsername());
ps.setObject(2, admin.getPassword());
rs = ps.executeQuery();
Admin adminLogin = null;
if (rs.next()) {
adminLogin = new Admin();
// 从数据库中获取值到实体类的setter方法中
adminLogin.setUsername(rs.getString(“username”));
adminLogin.setPassword(rs.getString(“password”));
// 返回的是你查询出来的完整的对象
return adminLogin;
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
// 关闭资源，避免出现异常
DBUtil.close(con, ps, rs);
}
return null;
}
}
TeacherDaoImpl
package com.sjsq.dao.impl;
import com.sjsq.dao.TeacherDao;
import com.sjsq.utils.DBUtil;
import com.sjsq.vo.Teacher;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
/**
-
@author: shuijianshiqing
-
@date: 2021-12-31
-
@description:
*/
public class TeacherDaoImpl implements TeacherDao {
/**
-
查询教师信息
-
@param sql
-
@param arr
-
@return
*/
@Override
public List selectAll(String sql, Object[] arr) {
Connection con = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
// 1.连接数据库
con = DBUtil.getConnection();
// 2.预编译
ps = con.prepareStatement(sql);
if (arr != null) {
for (int i = 0; i < arr.length; i++) {
// 传入sql的参数,向上转型,某个栏位的查询
ps.setObject(i + 1, arr[i]);
}
}
// 3.执行sql
rs = ps.executeQuery();
// 4.保存查询出来的数据到list
List list = new ArrayList<>();
while (rs.next()) {
Teacher teacher = new Teacher();
teacher.setId(rs.getInt(“id”));
teacher.setName(rs.getString(“name”));
teacher.setSex(rs.getString(“sex”));
teacher.setSubject(rs.getString(“subject”));
teacher.setSalary(rs.getDouble(“salary”));
teacher.setWorkTime(rs.getString(“workTime”));
list.add(teacher);
}
return list;
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭链接，避免数据库连接过多
DBUtil.close(con, ps, rs);
}
return null;
}
/**
-
根据教职工号查询教师信息
-
@param id
-
@return
*/
@Override
public Teacher selectTeacher(Integer id) {
Connection con = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
// 1.连接数据库
con = DBUtil.getConnection();
// 2.预编译
String sql = “select * from Teacher where id = ?”;
ps = con.prepareStatement(sql);
ps.setInt(1,id);
// 3.执行sql
rs = ps.executeQuery();
while (rs.next()){
Teacher teacher = new Teacher();
teacher.setId(rs.getInt(“id”));
teacher.setName(rs.getString(“name”));
teacher.setSex(rs.getString(“sex”));
teacher.setSubject(rs.getString(“subject”));
teacher.setSalary(rs.getDouble(“salary”));
teacher.setWorkTime(rs.getString(“workTime”));
return teacher;
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}finally {
// 关闭资源，避免出现异常
DBUtil.close(con,ps,rs);
}
return null;
}
/**
-
新增教师信息
-
@param teacher
-
@return
*/
@Override
public boolean addTeacher(Teacher teacher) {
String sql = “insert into teacher values (?,?,?,?,?,?)”;
List list = new ArrayList();
list.add(teacher.getId());
list.add(teacher.getName());
list.add(teacher.getSex());
list.add(teacher.getSubject());
list.add(teacher.getSalary());
list.add(teacher.getWorkTime());
boolean flag = DBUtil.addUpdateDelete(sql,list.toArray());
if(flag){
return true;
}else {
return false;
}
}
/**
-
更新教师信息
-
@param teacher
-
@return
*/
@Override
public boolean updateTeacher(Teacher teacher) {
String sql = “update teacher set name=?,sex=?,subject=?,salary=?,workTime=? where id=?”;
List list = new ArrayList();
list.add(teacher.getName());
list.add(teacher.getSex());
list.add(teacher.getSubject());
list.add(teacher.getSalary());
list.add(teacher.getWorkTime());
// 注意id在最后面
list.add(teacher.getId());
boolean flag = DBUtil.addUpdateDelete(sql,list.toArray());
if(flag){
return true;
}else {
return false;
}
}
/**
-
删除教师信息
-
@param id
-
@return
*/
@Override
public boolean deleteTeacher(Integer id) {
String sql = “delete from teacher where id=?”;
List list = new ArrayList();
list.add(id);
boolean flag = DBUtil.addUpdateDelete(sql,list.toArray());
if(flag){
return true;
}else {
return false;
}
}
}
main.jsp
<%@ page contentType=“text/html;charset=UTF-8” language=“java” pageEncoding=“UTF-8” %>
<%@ page import=“com.sjsq.service.TeacherService” %>
<%@ page import=“com.sjsq.service.impl.TeacherServiceImpl” %>
<%@ page import=“com.sjsq.vo.Teacher” %>
<%@ page import=“java.util.List” %>
<%-- 头部 --%>
<jsp:include page=“top.jsp”/>
<%
// 设置获取注册时的编码为UTF-8
request.setCharacterEncoding(“UTF-8”);
TeacherService studentService = new TeacherServiceImpl();
// 定义一个学生类
Teacher teacher = new Teacher();
// 获取上一个页面传过来的值
if (request.getParameter(“id”) != null && request.getParameter(“id”) != “”) {
Integer id = Integer.parseInt(request.getParameter(“id”));
teacher.setId(id);
}
// 获取所有教师
List list = studentService.selectAll(teacher);
%>
教师列表
请输入教职工号：
<%
for (int i = 0; i < list.size(); i++) {
Teacher t = list.get(i);
%>
<%=t.getId()%> <%=t.getName()%> <%=t.getSex()%> <%=t.getSubject()%> <%=t.getSalary()%> <%=t.getWorkTime()%><%
}
%>
<%-- 底部 --%>
<jsp:include page=“bottom.jsp”/>
teacher-add.jsp
<%@ page contentType=“text/html;charset=UTF-8” language=“java” %>
<%-- 头部 --%>
<jsp:include page=“top.jsp”/>
新增教师
返回上一级
添加
重置
<%-- 底部 --%>
<jsp:include page=“bottom.jsp”/>
teacher-delete.jsp
<%@ page import=“com.sjsq.service.TeacherService” %>
<%@ page import=“com.sjsq.service.impl.TeacherServiceImpl” %>
<%@ page import=“com.sjsq.vo.Teacher” %>
<%@ page contentType=“text/html;charset=UTF-8” language=“java” %>
<%
// 设置获取注册时的编码为UTF-8
request.setCharacterEncoding(“UTF-8”);
//获取main.jsp页面的id
Integer id = Integer.parseInt(request.getParameter(“id”));
// 删除学生
TeacherService TeacherService = new TeacherServiceImpl();
Teacher teacher = new Teacher();
teacher = TeacherService.selectTeacher(id);
System.out.println(“删除的教师信息”);
System.out.println(teacher);
boolean flag = TeacherService.deleteTeacher(id);
if (flag) {
response.sendRedirect(“main.jsp”);
} else {
response.sendRedirect(“error.jsp”);
}
%>
teacher-update.jsp
<%@ page import=“com.sjsq.service.TeacherService” %>
<%@ page import=“com.sjsq.service.impl.TeacherServiceImpl” %>
<%@ page import=“com.sjsq.vo.Teacher” %>
<%@ page contentType=“text/html;charset=UTF-8” language=“java” %>
<%-- 头部 --%>
<jsp:include page=“top.jsp”/>
修改教师
<%
//获取main.jsp页面的id
Integer id = Integer.parseInt(request.getParameter(“id”));
TeacherService teacherService = new TeacherServiceImpl();
Teacher teacher = teacherService.selectTeacher(id);
%>
返回上一级
<%-- 这里教职工号不能修改 --%>
修改
重置
<%-- 底部 --%>
<jsp:include page=“bottom.jsp”/>
四、其他
====
1.更多系统
Java+JSP系统系列实现
Java+Servlet系统系列实现
Java+SSM系统系列实现
Java+SSH系统系列实现
Java+Springboot系统系列实现
Java+Springboot+H-ui+Maven实现营销管理系统
Java+Springboot+Bootstrap+Maven实现网上商城系统
Java+Springboot+Bootstrap+Maven实现景区旅游管理系统
1.更多JavaWeb系统请关注专栏。
https://blog.youkuaiyun.com/helongqiang/category_10020130.html2.更多JavaSwing系统请关注专栏。
https://blog.youkuaiyun.com/helongqiang/category_6229101.html2.源码下载
let+JSP实现房屋租赁管理系统]( )
Java+SSM系统系列实现
Java+SSH系统系列实现
Java+Springboot系统系列实现
Java+Springboot+H-ui+Maven实现营销管理系统
Java+Springboot+Bootstrap+Maven实现网上商城系统
Java+Springboot+Bootstrap+Maven实现景区旅游管理系统
1.更多JavaWeb系统请关注专栏。
2.更多JavaSwing系统请关注专栏。
2.源码下载
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