==========网页列表显示界面stuList.jsp==============
<%@ page import="java.util.List" %>
<%@ page import="com.ibeifeng.student.Student" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>stuList</title>
</head>
<body>
<%
List<Student> list = (List<Student>)request.getAttribute("list");
//获取从doList02传递过来的记录总条数
String tdc = request.getAttribute("totalDataCount").toString();
//获取从doList02传递过来的总页面数
String tPage = request.getAttribute("totalPage").toString();
//
String cPage = request.getAttribute("curPage").toString();
int totalDataCount = 0;
int totalPage = 0;
int cuPage = 0;
int chooseSize = 5;
if(tdc != null && !"".equals(tdc)){
totalDataCount = Integer.parseInt(tdc);
}
if(tPage != null && !"".equals(tPage)){
totalPage = Integer.parseInt(tPage);
}
if(cPage != null && !"".equals(cPage)){
cuPage = Integer.parseInt(cPage);
}
%>
<a href="addStu.jsp">新增学员</a>
<form method="post" action="doList02.jsp">
姓名:<input type="text" name="name">
<input type="submit" value="查询">
<table width="100%" border="1px solid black">
<tr>
<td>学号</td>
<td>姓名</td>
<td>密码</td>
<td>性别</td>
<td>邮箱</td>
<td>操作</td>
</tr>
<%
for(Student stu : list){
%>
<tr>
<td><%=stu.getStu_id()%></td>
<td><%=stu.getStu_name()%></td>
<td><%=stu.getPwd()%></td>
<td><%=stu.getSex()%></td>
<td><%=stu.getEmail()%></td>
<td><a href="updateStu.jsp?sid=<%=stu.getStu_id()%>">修改</a> | <a href="doDel.jsp?sid=<%=stu.getStu_id()%>">删除</a></td>
</tr>
<% }%>
<tr>
<td colspan="6" align="center">
<%if(cuPage > 1){%>
<a href="doList02.jsp?curPage=<%=1%>">首页</a>
<a href="doList02.jsp?curPage=<%=cuPage-1%>">上一页</a>
<%}%>
<%for(int i=0; i<totalPage; i++){%>
<a href="doList02.jsp?curPage=<%=i+1%>"><%=i+1%></a>
<%}%>
<%if(cuPage < totalPage){%>
<a href="doList02.jsp?curPage=<%=cuPage+1%>">下一页</a>
<a href="doList02.jsp?curPage=<%=totalPage%>">末页</a>
<%}%>
<%=(cuPage + "/" + totalPage)%>
<input type="text" name="chooseCurPage">
<select name="choosePageSize">
<option value="5" >5</option>
<option value="10">10</option>
<option value="20">20</option>
</select>
</td>
</tr>
</table>
</form>
</body>
</html>
===========网页列表显示处理界面doList02.jsp==========
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="com.ibeifeng.student.Student" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="java.util.List" %>
<%@ page import="com.ibeifeng.student.BaseDao2" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
List<Student> list = null;
int pageSize = 5; //页面显示的记录条数,初始值设为5条
int curPage = 1; //当前页面数，初始值设为1
String cuPage = request.getParameter("curPage"); //获取从显示页面传递过来的当前页面值
String choosePageSize = request.getParameter("choosePageSize"); //获取从页面传递过来的页面容量
String chooseCurPage = request.getParameter("chooseCurPage");
String name = request.getParameter("name");
if(name == null){
name = "";
}
System.out.print("name"+name);
if(choosePageSize != null && !"".equals(choosePageSize)){
pageSize = Integer.parseInt(choosePageSize);
}
if(cuPage != null && !"".equals(cuPage)){
curPage = Integer.parseInt(cuPage);
}
if(chooseCurPage != null && !"".equals(chooseCurPage)){
curPage = Integer.parseInt(chooseCurPage);
}
BaseDao2 bd = new BaseDao2();
System.out.print("name2:"+name+","+"curPage:"+curPage+","+"pageSize:"+pageSize);
list = bd.page(name,curPage,pageSize); //调用分页方法，得到分页查询集合
int totalDataCount = bd.dataCount(); //查询到的总记录数
int totalPage = (totalDataCount % pageSize == 0)? (totalDataCount/pageSize):(totalDataCount/pageSize+1);
request.setAttribute("chooseSize",pageSize);
request.setAttribute("curPage",curPage); //将当前页面编号传递到stuList页面
request.setAttribute("totalPage",totalPage); //将总页面数传递到stuList页面
request.setAttribute("totalDataCount",totalDataCount); //将总记录数传递到stuList页面
request.setAttribute("list",list);
System.out.print("list:"+list);
request.getRequestDispatcher("stuList.jsp").forward(request,response);
%>
==============修改页面updateStu.jsp=============
<%@ page import="com.ibeifeng.student.StudentDao" %>
<%@ page import="com.ibeifeng.student.Student" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
//获取前端页面传递的参数
String sid = request.getParameter("sid"); //该参数由stuList页面的<a href="updateStu.jsp?sid=stu.getStudentId()">传递过来
//创建StudentDao对象
StudentDao stuDao = new StudentDao();
Student stu = stuDao.getStuByStuId(sid);
if(stu != null){
request.setAttribute("stu",stu);
}
%>
<html>
<head>
<title>新增学员信息</title>
</head>
<body>
<form action="doUpdate.jsp" method="post">
<table align="center" border="1px solid black">
<tr>
<td>学号</td>
<td><input type="text" name="stuId" readonly="readonly" value="<%=stu.getStu_id()%>"> </td>
</tr>
<tr>
<td>姓名</td>
<td><input type="text" name="stuName" value="<%=stu.getStu_name()%>"></td>
</tr>
<tr>
<td>密码</td>
<td><input type="password" name="pwd" value="<%=stu.getPwd()%>"></td>
</tr>
<tr>
<td>性别</td>
<td>
<input type="radio" name="gender" value="0" <%if(stu.getSex() == 0){%>checked="checked"<%}%>>女
<input type="radio" name="gender" value="1" <%if(stu.getSex() == 1){%>checked="checked"<%}%>>男
</td>
</tr>
<tr>
<td>邮箱</td>
<td><input type="text" name="email" value="<%=stu.getEmail()%>"></td>
</tr>
<tr>
<td colspan="2">
<input type="submit" name="submit" value="保存">
<input type="button" name="return" value="取消">
</td>
</tr>
</table>
</form>
</body>
</html>
=============修改处理部分doUpdate.jsp============
<%@ page import="com.ibeifeng.student.Student" %>
<%@ page import="com.ibeifeng.student.BaseDao2" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
BaseDao2 bd = new BaseDao2();
String sql = "update student set stu_name=?,pwd=?,sex=?,email=? where stu_id=?";
String stuid = request.getParameter("stuId");
int sid = Integer.parseInt(stuid);
String name = request.getParameter("stuName");
String pwd = request.getParameter("pwd");
String gender = request.getParameter("gender");
int gen = Integer.parseInt(gender);
String email = request.getParameter("email");
Object [] obj = {name, pwd, gender, email, sid};
int result = bd.update(sql,obj, Student.class);
if(result > 0){
request.getRequestDispatcher("doList02.jsp").forward(request,response);
}else{
request.getRequestDispatcher("updateStu.jsp?sno="+stuid).forward(request,response);
}
%>
===============删除处理部分doDel.jsp============
<%@ page import="com.ibeifeng.student.BaseDao2" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
String sid = request.getParameter("sid");
BaseDao2 bd = new BaseDao2();
bd.del(sid);
request.getRequestDispatcher("doList02.jsp").forward(request,response);
%>
===============新增页面addStu.jsp==============
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>新增学员信息</title>
</head>
<body>
<form action="doSave.jsp" method="post">
<table align="center" border="1px solid black">
<tr>
<td>学号</td>
<td><input type="text" name="stuId" > </td>
</tr>
<tr>
<td>姓名</td>
<td><input type="text" name="stuName" ></td>
</tr>
<tr>
<td>密码</td>
<td><input type="password" name="pwd" ></td>
</tr>
<tr>
<td>性别</td>
<td>
<input type="radio" name="gender" value="0">女
<input type="radio" name="gender" value="1">男
</td>
</tr>
<tr>
<td>邮箱</td>
<td><input type="text" name="email" ></td>
</tr>
<tr>
<td colspan="2">
<input type="submit" name="submit" value="保存">
<input type="button" name="return" value="取消">
</td>
</tr>
</table>
</form>
</body>
</html>
=============新增信息保存处理doSave.jsp===========
<%@ page import="com.ibeifeng.student.ConfigUtil" %>
<%@ page import="java.sql.DriverManager" %>
<%@ page import="java.sql.Connection" %>
<%@ page import="java.sql.PreparedStatement" %>
<%@ page import="java.sql.ResultSet" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
Class.forName(new ConfigUtil().getValue("driver"));
Connection conn = DriverManager.getConnection(
new ConfigUtil().getValue("url"),new ConfigUtil().getValue("username"),new ConfigUtil().getValue("password"));
String sql = "insert into student(stu_id,stu_name,pwd,sex,email) values(?,?,?,?,?)";
PreparedStatement ps = conn.prepareStatement(sql);
String rid = request.getParameter("stuId");
int id = Integer.parseInt(rid);
ps.setInt(1,id);
ps.setString(2,request.getParameter("stuName"));
ps.setString(3,request.getParameter("pwd"));
ps.setInt(4,1);
ps.setString(5,request.getParameter("email"));
int isSuccess = ps.executeUpdate();
System.out.print(isSuccess);
if(isSuccess <= 0){
System.out.print("新增有误，请重试");
request.getRequestDispatcher("/stuInfo/addStu.jsp").forward(request,response);
}else{
request.getRequestDispatcher("/stuInfo/doList02.jsp").forward(request,response);
}
if(ps != null){
ps.close();
}
if(conn != null){
conn.close();
}
%>
=============通用方法类BaseDao2==============
package com.ibeifeng.student;
import java.lang.reflect.Field;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;
/*
* 通用查询、更新升级版
* */
public class BaseDao2 {
static {
try {
Class.forName(ConfigUtil.getValue("driver"));
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
public Connection getConn(){
try {
return DriverManager.getConnection(ConfigUtil.getValue("url"),
ConfigUtil.getValue("username"),
ConfigUtil.getValue("password"));
} catch (SQLException e) {
e.printStackTrace();
return null;
}
}
public void close(ResultSet rs, PreparedStatement ps, Connection conn){
try {
if(rs != null) {
rs.close();
}
if(ps != null){
ps.close();
}
if(conn != null){
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
/*
* 返回一条查询记录
* 输入参数Object[] obj中存放sql语句中变量的值
* */
public Object search(String sql, Object[] obj, Class<?> clz){
Connection conn = getConn();
PreparedStatement ps = null;
ResultSet rs = null;
try {
ps = conn.prepareStatement(sql);
if(obj != null && obj.length>0){
for(int i=0; i<obj.length; i++) {
ps.setObject(i + 1, obj[i]);
}
}
rs = ps.executeQuery();
if(!rs.next()){
return null;
}
/*
* 在此处应该要给对象赋值，但遇到了以下问题
* 如何确定列数？
* 如何确定列名？
* 如何确定查询的是哪个对象？
* */
return doResultSet(rs,clz);
} catch (SQLException e) {
throw new RuntimeException();
}finally {
close(null, ps, conn);
}
}
/*
* 运用java反射机制，编写通用类，Class<?>表示不知道传入的会是什么类型的数据，因此用？代替
* */
public Object doResultSet(ResultSet rs, Class<?> clz){
Object bean = null;
try {
bean = clz.newInstance(); //对象实例化
ResultSetMetaData metaData = rs.getMetaData(); //获取元数据
int colCount = metaData.getColumnCount(); //获取列数
for(int i=0; i<colCount; i++){
Object colValue = rs.getObject(i+1); //获取列的值
String colName = metaData.getColumnName(i+1);
Field f = clz.getDeclaredField(colName);
f.setAccessible(true); //取消某些检测
f.set(bean,colValue); //将从数据库获取的值传递给bean对象
}
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} catch (NoSuchFieldException e) {
e.printStackTrace();
}
return bean;
}
/*
* 查询对象为List，即有多条查询记录
* */
public Object searchList(String sql,Object[] obj,Class<?> clz){
PreparedStatement ps = null;
ResultSet rs = null;
Connection conn = getConn();
try {
ps = conn.prepareStatement(sql);
if(obj != null && obj.length>0) {
for (int i = 0; i < obj.length; i++) {
ps.setObject(i + 1, obj[i]);
}
}
rs = ps.executeQuery();
if(!rs.next()){
return null;
}
return doResultSetList(rs, clz);
} catch (SQLException e) {
e.printStackTrace();
return null;
}finally {
close(rs,ps,conn);
}
}
public List<Object> doResultSetList(ResultSet rs,Class<?> clz){
List<Object> list = new ArrayList<Object>();
try {
while(rs.next()) {
Object bean = clz.newInstance();
ResultSetMetaData metaData = rs.getMetaData();
int colCount = metaData.getColumnCount();
for (int i = 0; i < colCount; i++) {
String colName = metaData.getColumnName(i + 1);
Object colValue = rs.getObject(i + 1);
Field f = clz.getDeclaredField(colName);
f.setAccessible(true);
f.set(bean, colValue);
}
list.add(bean);
}
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} catch (NoSuchFieldException e) {
e.printStackTrace();
}
return list;
}
public int update(String sql, Object[] obj, Class<Student> studentClass){
Connection conn = getConn();
PreparedStatement ps = null;
try {
ps = conn.prepareStatement(sql);
if(obj != null && obj.length>0) {
for (int i = 0; i < obj.length; i++) {
ps.setObject(i+1,obj[i]);
}
}
return ps.executeUpdate();
} catch (SQLException e) {
throw new RuntimeException();
}finally {
close(null,ps,conn);
}
}
//删除功能
public int del(String stu_id){
String sql = "delete from student where stu_id = ?";
Connection conn = getConn();
PreparedStatement ps = null;
try {
ps = conn.prepareStatement(sql);
ps.setString(1,stu_id);
return ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException();
}finally {
close(null,ps,conn);
}
}
//分页查询
public List<Student> page(int pageIndex, int pageSize){
List<Student> list = null;
String sql = "select * from student where stu_name like ? limit ?,?";
int index = (pageIndex-1)*pageSize;
Object[] obj = {index, pageSize};
list = (List<Student>)searchList(sql,obj,Student.class);
return list;
}
//重写分页查询方法
public List<Student> page(String name, int pageIndex, int pageSize){
List<Student> list = null;
String sql = "select * from student where stu_name like ? limit ?,?";
int index = (pageIndex-1)*pageSize;
Object[] obj = {"%"+name+"%", index, pageSize};
list = (List<Student>)searchList(sql,obj,Student.class);
return list;
}
//查询数据的总条数
public int dataCount(){
String sql = "select count(*) from student";
int count=0;
Connection conn = getConn();
PreparedStatement ps = null;
ResultSet rs = null;
try {
ps = conn.prepareStatement(sql);
rs = ps.executeQuery();
if(rs.next()){
count = rs.getInt(1);
}
} catch (SQLException e) {
e.printStackTrace();
}
return count;
}
}
==============数据对象类Student===============
package com.ibeifeng.student;
public class Student {
private int stu_id;
private String stu_name;
private String pwd;
private int sex;
private String email;
public Student(){}
public int getStu_id() {
return stu_id;
}
public void setStu_id(int stu_id) {
this.stu_id = stu_id;
}
public String getStu_name() {
return stu_name;
}
public void setStu_name(String stu_name) {
this.stu_name = stu_name;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
public int getSex() {
return sex;
}
public void setSex(int sex) {
this.sex = sex;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@Override
public String toString() {
return "Student{" +
"stu_id=" + stu_id +
", stu_name=‘" + stu_name + ‘\‘‘ +
", pwd=‘" + pwd + ‘\‘‘ +
", sex=" + sex +
", email=‘" + email + ‘\‘‘ +
‘}‘;
}
}
============获取配置信息类=================
package com.ibeifeng.student;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
public class ConfigUtil {
//通过key获取jdbc配置的value
public static String getValue(String key){
Properties pro = new Properties();
//获取流信息
InputStream is = ConfigUtil.class.getResourceAsStream("/jdbc.properties");
try {
//加载流文件
pro.load(is);
//获取属性值
return pro.getProperty(key);
} catch (IOException e) {
throw new RuntimeException();
}
}
}
==============此处只要关心通过id获取类信息的方法getStuByStuId======
package com.ibeifeng.student;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class StudentDao {
/*
* Student Dao用于处理Student类
* */
Connection conn = null;
PreparedStatement ps = null;
public int updateStu(Student stu){
/*
* 更新学员信息
* */
String sql = "update student set stu_name=?,pwd=?,sex=?,email=? where stu_id=?";
try {
ps = BaseDao.getConn().prepareStatement(sql);
ps.setString(1,stu.getStu_name());
ps.setString(2,stu.getPwd());
ps.setInt(3,stu.getSex());
ps.setString(4,stu.getEmail());
ps.setInt(5,stu.getStu_id());
return ps.executeUpdate();
} catch (SQLException e) {
throw new RuntimeException();
}finally {
BaseDao.close(null,ps,conn);
}
}
public Student getStuByStuId(String stu_id){
String sql = "select * from student where stu_id=?";
Student stu = null;
try {
conn = BaseDao.getConn();
ps = conn.prepareStatement(sql);
int sid = Integer.parseInt(stu_id);
ps.setInt(1,sid);
ResultSet rs = ps.executeQuery();
if(rs.next()){
stu = new Student();
stu.setStu_id(rs.getInt("stu_id"));
stu.setStu_name(rs.getString("stu_name"));
stu.setPwd(rs.getString("pwd"));
stu.setSex(rs.getInt("sex"));
stu.setEmail(rs.getString("email"));
}
} catch (SQLException e) {
e.printStackTrace();
}finally {
BaseDao.close(null,ps,conn);
}
return stu;
}
/*
* 根据学号删除学生信息
* */
public int delStu(String sid){
String sql = "delete from student where stu_id = ?";
conn = BaseDao.getConn();
try {
ps = conn.prepareStatement(sql);
int id = Integer.parseInt(sid);
ps.setInt(1,id);
return ps.executeUpdate();
} catch (SQLException e) {
throw new RuntimeException();
}
}
}
==========网页列表显示界面stuList.jsp==============
<%@ page import="java.util.List" %>
<%@ page import="com.ibeifeng.student.Student" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>stuList</title>
</head>
<body>
<%
List<Student> list = (List<Student>)request.getAttribute("list");
//获取从doList02传递过来的记录总条数
String tdc = request.getAttribute("totalDataCount").toString();
//获取从doList02传递过来的总页面数
String tPage = request.getAttribute("totalPage").toString();
//
String cPage = request.getAttribute("curPage").toString();
int totalDataCount = 0;
int totalPage = 0;
int cuPage = 0;
int chooseSize = 5;
if(tdc != null && !"".equals(tdc)){
totalDataCount = Integer.parseInt(tdc);
}
if(tPage != null && !"".equals(tPage)){
totalPage = Integer.parseInt(tPage);
}
if(cPage != null && !"".equals(cPage)){
cuPage = Integer.parseInt(cPage);
}
%>
<a href="addStu.jsp">新增学员</a>
<form method="post" action="doList02.jsp">
姓名:<input type="text" name="name">
<input type="submit" value="查询">
<table width="100%" border="1px solid black">
<tr>
<td>学号</td>
<td>姓名</td>
<td>密码</td>
<td>性别</td>
<td>邮箱</td>
<td>操作</td>
</tr>
<%
for(Student stu : list){
%>
<tr>
<td><%=stu.getStu_id()%></td>
<td><%=stu.getStu_name()%></td>
<td><%=stu.getPwd()%></td>
<td><%=stu.getSex()%></td>
<td><%=stu.getEmail()%></td>
<td><a href="updateStu.jsp?sid=<%=stu.getStu_id()%>">修改</a> | <a href="doDel.jsp?sid=<%=stu.getStu_id()%>">删除</a></td>
</tr>
<% }%>
<tr>
<td colspan="6" align="center">
<%if(cuPage > 1){%>
<a href="doList02.jsp?curPage=<%=1%>">首页</a>
<a href="doList02.jsp?curPage=<%=cuPage-1%>">上一页</a>
<%}%>
<%for(int i=0; i<totalPage; i++){%>
<a href="doList02.jsp?curPage=<%=i+1%>"><%=i+1%></a>
<%}%>
<%if(cuPage < totalPage){%>
<a href="doList02.jsp?curPage=<%=cuPage+1%>">下一页</a>
<a href="doList02.jsp?curPage=<%=totalPage%>">末页</a>
<%}%>
<%=(cuPage + "/" + totalPage)%>
<input type="text" name="chooseCurPage">
<select name="choosePageSize">
<option value="5" >5</option>
<option value="10">10</option>
<option value="20">20</option>
</select>
</td>
</tr>
</table>
</form>
</body>
</html>
===========网页列表显示处理界面doList02.jsp==========
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="com.ibeifeng.student.Student" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="java.util.List" %>
<%@ page import="com.ibeifeng.student.BaseDao2" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
List<Student> list = null;
int pageSize = 5; //页面显示的记录条数,初始值设为5条
int curPage = 1; //当前页面数，初始值设为1
String cuPage = request.getParameter("curPage"); //获取从显示页面传递过来的当前页面值
String choosePageSize = request.getParameter("choosePageSize"); //获取从页面传递过来的页面容量
String chooseCurPage = request.getParameter("chooseCurPage");
String name = request.getParameter("name");
if(name == null){
name = "";
}
System.out.print("name"+name);
if(choosePageSize != null && !"".equals(choosePageSize)){
pageSize = Integer.parseInt(choosePageSize);
}
if(cuPage != null && !"".equals(cuPage)){
curPage = Integer.parseInt(cuPage);
}
if(chooseCurPage != null && !"".equals(chooseCurPage)){
curPage = Integer.parseInt(chooseCurPage);
}
BaseDao2 bd = new BaseDao2();
System.out.print("name2:"+name+","+"curPage:"+curPage+","+"pageSize:"+pageSize);
list = bd.page(name,curPage,pageSize); //调用分页方法，得到分页查询集合
int totalDataCount = bd.dataCount(); //查询到的总记录数
int totalPage = (totalDataCount % pageSize == 0)? (totalDataCount/pageSize):(totalDataCount/pageSize+1);
request.setAttribute("chooseSize",pageSize);
request.setAttribute("curPage",curPage); //将当前页面编号传递到stuList页面
request.setAttribute("totalPage",totalPage); //将总页面数传递到stuList页面
request.setAttribute("totalDataCount",totalDataCount); //将总记录数传递到stuList页面
request.setAttribute("list",list);
System.out.print("list:"+list);
request.getRequestDispatcher("stuList.jsp").forward(request,response);
%>
==============修改页面updateStu.jsp=============
<%@ page import="com.ibeifeng.student.StudentDao" %>
<%@ page import="com.ibeifeng.student.Student" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
//获取前端页面传递的参数
String sid = request.getParameter("sid"); //该参数由stuList页面的<a href="updateStu.jsp?sid=stu.getStudentId()">传递过来
//创建StudentDao对象
StudentDao stuDao = new StudentDao();
Student stu = stuDao.getStuByStuId(sid);
if(stu != null){
request.setAttribute("stu",stu);
}
%>
<html>
<head>
<title>新增学员信息</title>
</head>
<body>
<form action="doUpdate.jsp" method="post">
<table align="center" border="1px solid black">
<tr>
<td>学号</td>
<td><input type="text" name="stuId" readonly="readonly" value="<%=stu.getStu_id()%>"> </td>
</tr>
<tr>
<td>姓名</td>
<td><input type="text" name="stuName" value="<%=stu.getStu_name()%>"></td>
</tr>
<tr>
<td>密码</td>
<td><input type="password" name="pwd" value="<%=stu.getPwd()%>"></td>
</tr>
<tr>
<td>性别</td>
<td>
<input type="radio" name="gender" value="0" <%if(stu.getSex() == 0){%>checked="checked"<%}%>>女
<input type="radio" name="gender" value="1" <%if(stu.getSex() == 1){%>checked="checked"<%}%>>男
</td>
</tr>
<tr>
<td>邮箱</td>
<td><input type="text" name="email" value="<%=stu.getEmail()%>"></td>
</tr>
<tr>
<td colspan="2">
<input type="submit" name="submit" value="保存">
<input type="button" name="return" value="取消">
</td>
</tr>
</table>
</form>
</body>
</html>
=============修改处理部分doUpdate.jsp============
<%@ page import="com.ibeifeng.student.Student" %>
<%@ page import="com.ibeifeng.student.BaseDao2" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
BaseDao2 bd = new BaseDao2();
String sql = "update student set stu_name=?,pwd=?,sex=?,email=? where stu_id=?";
String stuid = request.getParameter("stuId");
int sid = Integer.parseInt(stuid);
String name = request.getParameter("stuName");
String pwd = request.getParameter("pwd");
String gender = request.getParameter("gender");
int gen = Integer.parseInt(gender);
String email = request.getParameter("email");
Object [] obj = {name, pwd, gender, email, sid};
int result = bd.update(sql,obj, Student.class);
if(result > 0){
request.getRequestDispatcher("doList02.jsp").forward(request,response);
}else{
request.getRequestDispatcher("updateStu.jsp?sno="+stuid).forward(request,response);
}
%>
===============删除处理部分doDel.jsp============
<%@ page import="com.ibeifeng.student.BaseDao2" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
String sid = request.getParameter("sid");
BaseDao2 bd = new BaseDao2();
bd.del(sid);
request.getRequestDispatcher("doList02.jsp").forward(request,response);
%>
===============新增页面addStu.jsp==============
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>新增学员信息</title>
</head>
<body>
<form action="doSave.jsp" method="post">
<table align="center" border="1px solid black">
<tr>
<td>学号</td>
<td><input type="text" name="stuId" > </td>
</tr>
<tr>
<td>姓名</td>
<td><input type="text" name="stuName" ></td>
</tr>
<tr>
<td>密码</td>
<td><input type="password" name="pwd" ></td>
</tr>
<tr>
<td>性别</td>
<td>
<input type="radio" name="gender" value="0">女
<input type="radio" name="gender" value="1">男
</td>
</tr>
<tr>
<td>邮箱</td>
<td><input type="text" name="email" ></td>
</tr>
<tr>
<td colspan="2">
<input type="submit" name="submit" value="保存">
<input type="button" name="return" value="取消">
</td>
</tr>
</table>
</form>
</body>
</html>
=============新增信息保存处理doSave.jsp===========
<%@ page import="com.ibeifeng.student.ConfigUtil" %>
<%@ page import="java.sql.DriverManager" %>
<%@ page import="java.sql.Connection" %>
<%@ page import="java.sql.PreparedStatement" %>
<%@ page import="java.sql.ResultSet" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
Class.forName(new ConfigUtil().getValue("driver"));
Connection conn = DriverManager.getConnection(
new ConfigUtil().getValue("url"),new ConfigUtil().getValue("username"),new ConfigUtil().getValue("password"));
String sql = "insert into student(stu_id,stu_name,pwd,sex,email) values(?,?,?,?,?)";
PreparedStatement ps = conn.prepareStatement(sql);
String rid = request.getParameter("stuId");
int id = Integer.parseInt(rid);
ps.setInt(1,id);
ps.setString(2,request.getParameter("stuName"));
ps.setString(3,request.getParameter("pwd"));
ps.setInt(4,1);
ps.setString(5,request.getParameter("email"));
int isSuccess = ps.executeUpdate();
System.out.print(isSuccess);
if(isSuccess <= 0){
System.out.print("新增有误，请重试");
request.getRequestDispatcher("/stuInfo/addStu.jsp").forward(request,response);
}else{
request.getRequestDispatcher("/stuInfo/doList02.jsp").forward(request,response);
}
if(ps != null){
ps.close();
}
if(conn != null){
conn.close();
}
%>
=============通用方法类BaseDao2==============
package com.ibeifeng.student;
import java.lang.reflect.Field;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;
/*
* 通用查询、更新升级版
* */
public class BaseDao2 {
static {
try {
Class.forName(ConfigUtil.getValue("driver"));
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
public Connection getConn(){
try {
return DriverManager.getConnection(ConfigUtil.getValue("url"),
ConfigUtil.getValue("username"),
ConfigUtil.getValue("password"));
} catch (SQLException e) {
e.printStackTrace();
return null;
}
}
public void close(ResultSet rs, PreparedStatement ps, Connection conn){
try {
if(rs != null) {
rs.close();
}
if(ps != null){
ps.close();
}
if(conn != null){
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
/*
* 返回一条查询记录
* 输入参数Object[] obj中存放sql语句中变量的值
* */
public Object search(String sql, Object[] obj, Class<?> clz){
Connection conn = getConn();
PreparedStatement ps = null;
ResultSet rs = null;
try {
ps = conn.prepareStatement(sql);
if(obj != null && obj.length>0){
for(int i=0; i<obj.length; i++) {
ps.setObject(i + 1, obj[i]);
}
}
rs = ps.executeQuery();
if(!rs.next()){
return null;
}
/*
* 在此处应该要给对象赋值，但遇到了以下问题
* 如何确定列数？
* 如何确定列名？
* 如何确定查询的是哪个对象？
* */
return doResultSet(rs,clz);
} catch (SQLException e) {
throw new RuntimeException();
}finally {
close(null, ps, conn);
}
}
/*
* 运用java反射机制，编写通用类，Class<?>表示不知道传入的会是什么类型的数据，因此用？代替
* */
public Object doResultSet(ResultSet rs, Class<?> clz){
Object bean = null;
try {
bean = clz.newInstance(); //对象实例化
ResultSetMetaData metaData = rs.getMetaData(); //获取元数据
int colCount = metaData.getColumnCount(); //获取列数
for(int i=0; i<colCount; i++){
Object colValue = rs.getObject(i+1); //获取列的值
String colName = metaData.getColumnName(i+1);
Field f = clz.getDeclaredField(colName);
f.setAccessible(true); //取消某些检测
f.set(bean,colValue); //将从数据库获取的值传递给bean对象
}
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} catch (NoSuchFieldException e) {
e.printStackTrace();
}
return bean;
}
/*
* 查询对象为List，即有多条查询记录
* */
public Object searchList(String sql,Object[] obj,Class<?> clz){
PreparedStatement ps = null;
ResultSet rs = null;
Connection conn = getConn();
try {
ps = conn.prepareStatement(sql);
if(obj != null && obj.length>0) {
for (int i = 0; i < obj.length; i++) {
ps.setObject(i + 1, obj[i]);
}
}
rs = ps.executeQuery();
if(!rs.next()){
return null;
}
return doResultSetList(rs, clz);
} catch (SQLException e) {
e.printStackTrace();
return null;
}finally {
close(rs,ps,conn);
}
}
public List<Object> doResultSetList(ResultSet rs,Class<?> clz){
List<Object> list = new ArrayList<Object>();
try {
while(rs.next()) {
Object bean = clz.newInstance();
ResultSetMetaData metaData = rs.getMetaData();
int colCount = metaData.getColumnCount();
for (int i = 0; i < colCount; i++) {
String colName = metaData.getColumnName(i + 1);
Object colValue = rs.getObject(i + 1);
Field f = clz.getDeclaredField(colName);
f.setAccessible(true);
f.set(bean, colValue);
}
list.add(bean);
}
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} catch (NoSuchFieldException e) {
e.printStackTrace();
}
return list;
}
public int update(String sql, Object[] obj, Class<Student> studentClass){
Connection conn = getConn();
PreparedStatement ps = null;
try {
ps = conn.prepareStatement(sql);
if(obj != null && obj.length>0) {
for (int i = 0; i < obj.length; i++) {
ps.setObject(i+1,obj[i]);
}
}
return ps.executeUpdate();
} catch (SQLException e) {
throw new RuntimeException();
}finally {
close(null,ps,conn);
}
}
//删除功能
public int del(String stu_id){
String sql = "delete from student where stu_id = ?";
Connection conn = getConn();
PreparedStatement ps = null;
try {
ps = conn.prepareStatement(sql);
ps.setString(1,stu_id);
return ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException();
}finally {
close(null,ps,conn);
}
}
//分页查询
public List<Student> page(int pageIndex, int pageSize){
List<Student> list = null;
String sql = "select * from student where stu_name like ? limit ?,?";
int index = (pageIndex-1)*pageSize;
Object[] obj = {index, pageSize};
list = (List<Student>)searchList(sql,obj,Student.class);
return list;
}
//重写分页查询方法
public List<Student> page(String name, int pageIndex, int pageSize){
List<Student> list = null;
String sql = "select * from student where stu_name like ? limit ?,?";
int index = (pageIndex-1)*pageSize;
Object[] obj = {"%"+name+"%", index, pageSize};
list = (List<Student>)searchList(sql,obj,Student.class);
return list;
}
//查询数据的总条数
public int dataCount(){
String sql = "select count(*) from student";
int count=0;
Connection conn = getConn();
PreparedStatement ps = null;
ResultSet rs = null;
try {
ps = conn.prepareStatement(sql);
rs = ps.executeQuery();
if(rs.next()){
count = rs.getInt(1);
}
} catch (SQLException e) {
e.printStackTrace();
}
return count;
}
}
==============数据对象类Student===============
package com.ibeifeng.student;
public class Student {
private int stu_id;
private String stu_name;
private String pwd;
private int sex;
private String email;
public Student(){}
public int getStu_id() {
return stu_id;
}
public void setStu_id(int stu_id) {
this.stu_id = stu_id;
}
public String getStu_name() {
return stu_name;
}
public void setStu_name(String stu_name) {
this.stu_name = stu_name;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
public int getSex() {
return sex;
}
public void setSex(int sex) {
this.sex = sex;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@Override
public String toString() {
return "Student{" +
"stu_id=" + stu_id +
", stu_name=‘" + stu_name + ‘\‘‘ +
", pwd=‘" + pwd + ‘\‘‘ +
", sex=" + sex +
", email=‘" + email + ‘\‘‘ +
‘}‘;
}
}
============获取配置信息类=================
package com.ibeifeng.student;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
public class ConfigUtil {
//通过key获取jdbc配置的value
public static String getValue(String key){
Properties pro = new Properties();
//获取流信息
InputStream is = ConfigUtil.class.getResourceAsStream("/jdbc.properties");
try {
//加载流文件
pro.load(is);
//获取属性值
return pro.getProperty(key);
} catch (IOException e) {
throw new RuntimeException();
}
}
}
==============此处只要关心通过id获取类信息的方法getStuByStuId======
package com.ibeifeng.student;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class StudentDao {
/*
* Student Dao用于处理Student类
* */
Connection conn = null;
PreparedStatement ps = null;
public int updateStu(Student stu){
/*
* 更新学员信息
* */
String sql = "update student set stu_name=?,pwd=?,sex=?,email=? where stu_id=?";
try {
ps = BaseDao.getConn().prepareStatement(sql);
ps.setString(1,stu.getStu_name());
ps.setString(2,stu.getPwd());
ps.setInt(3,stu.getSex());
ps.setString(4,stu.getEmail());
ps.setInt(5,stu.getStu_id());
return ps.executeUpdate();
} catch (SQLException e) {
throw new RuntimeException();
}finally {
BaseDao.close(null,ps,conn);
}
}
public Student getStuByStuId(String stu_id){
String sql = "select * from student where stu_id=?";
Student stu = null;
try {
conn = BaseDao.getConn();
ps = conn.prepareStatement(sql);
int sid = Integer.parseInt(stu_id);
ps.setInt(1,sid);
ResultSet rs = ps.executeQuery();
if(rs.next()){
stu = new Student();
stu.setStu_id(rs.getInt("stu_id"));
stu.setStu_name(rs.getString("stu_name"));
stu.setPwd(rs.getString("pwd"));
stu.setSex(rs.getInt("sex"));
stu.setEmail(rs.getString("email"));
}
} catch (SQLException e) {
e.printStackTrace();
}finally {
BaseDao.close(null,ps,conn);
}
return stu;
}
/*
* 根据学号删除学生信息
* */
public int delStu(String sid){
String sql = "delete from student where stu_id = ?";
conn = BaseDao.getConn();
try {
ps = conn.prepareStatement(sql);
int id = Integer.parseInt(sid);
ps.setInt(1,id);
return ps.executeUpdate();
} catch (SQLException e) {
throw new RuntimeException();
}
}
}
原文地址：https://www.cnblogs.com/helloworldlx/p/9065056.html
时间： 2024-11-14 13:14:17