[JSP]JDBC 用户登陆，查看修改添加用户

先使用JavaBean,封装JDBC数据库的操作。

package com.yyqf.toolbean;
/*
 * 数据库操作类
 * 查询数据库，获取所有投票选项
 * 获取指定IP上一次进行投票的时间
 * 更新数据表，实现票数累加
 * */

import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.ArrayList;
import java.util.Properties;

import com.yyqf.valuebean.User;


public class DB 
{
	private String DRIVER;
	private String URL;
	private String USERNAME;
	private String PASSWORD;
	private Connection conn;
	private Statement stmt;
	private PreparedStatement prstmt;
	private ResultSet rs;
	
	public DB() throws IOException
	{
		Properties p = new Properties();
		InputStream in = getClass().getResourceAsStream("/Config.properties");
		p.load(in);
		DRIVER = p.getProperty("DRIVER");
		URL = p.getProperty("URL");
		USERNAME = p.getProperty("USERNAME");
		PASSWORD = p.getProperty("PASSWORD");
	}
	public void getConnection()
	{
		try {
			Class.forName(DRIVER);
		} catch (Exception e) {
			System.out.println("驱动加载失败");
			e.printStackTrace();
		}
		try {
			conn = DriverManager.getConnection(URL,USERNAME,PASSWORD);
		} catch (Exception e) {
			System.out.println("连接数据库失败");
			e.printStackTrace();
		}
	}
	public void getstmt()
	{
		getConnection();
		try {
			stmt = conn.createStatement();
			stmt.execute("USE User_pwd");
		} catch (Exception e) {
			System.out.println("获取statment对象失败");
			e.printStackTrace();
		}
	}
	public ResultSet getRs(String sql)
	{
		ResultSet resultSet = null;
		getstmt();
		try {
			rs = stmt.executeQuery(sql);
			resultSet = rs;
		} catch (Exception e) {
			System.out.println("获取resultset失败");
			e.printStackTrace();
		}
		return resultSet;
	}
	public ResultSet getPrRs(String sql)
	{
		ResultSet resultSet = null;
		try {
			getstmt();
			prstmt = conn.prepareStatement(sql);	
		} catch (Exception e) {
			System.out.println("获取Prepare statment失败");
			e.printStackTrace();
		}
		try {
			rs = prstmt.executeQuery();
			resultSet = rs;
		} catch (Exception e) {
			System.out.println("获取Prepare resultset失败");
			e.printStackTrace();
		}
		return resultSet;
	}
	public void closed()
	{
		try {
			if (rs!=null) rs.close();
			if (stmt!=null) stmt.close();
			if (prstmt!=null) prstmt.close();
			if (conn!=null) conn.close();
		} catch (Exception e) {
			System.out.println("关闭数据库失败");
			e.printStackTrace();
		}
	}
	public ArrayList<User> SelectAllUser(String sql)
	{
		ArrayList<User> userlist = null;
		if (sql!=null){
			getRs(sql);
			if (rs!=null){
				userlist = new ArrayList<User>();
				try {
					while (rs.next()){
					User temp = new User();
					temp.setUsername(MyTools.toChinese(MyTools.change(rs.getString("username"))));
					temp.setPassword(MyTools.toChinese(MyTools.change(rs.getString("password"))));
					temp.setPower(MyTools.toChinese(MyTools.change(rs.getString("power"))));
					userlist.add(temp);
					}
				} catch (Exception e) {
					System.out.println("封装应用信息失败 Accout_user表");
					e.printStackTrace();
				}finally{
					closed();
				}
			}
		}
		return userlist;
	}
	public int update(String sql) //更新数据表
	{
		int i = -1;
		if (sql!=null && !sql.equals(""))
		{
			getstmt();
			try {
				i = stmt.executeUpdate(sql);
			} catch (Exception e) {
				System.out.println("更新数据库失败");
				e.printStackTrace();
			}finally{
				closed();
			}
		}
		return i;
	}
}

JSP常用工具封装

package com.yyqf.toolbean;
/*
 * JSP操作工具类*/
import java.sql.Date;
import java.text.SimpleDateFormat;

public class MyTools {
	public static String intToStr(int num) //把int转换为字符
	{
		return String.valueOf(num);
	}
	public static int strToint(String str) //把字符转换为int
	{
		if (str==null || str.equals("")) str="0";
		int i=0;
		try {
			i=Integer.parseInt(str);
		} catch (Exception e) {
			i=0;
			e.printStackTrace();
		}
		return i;
	}
	public static boolean compareTime(long today,long temp) //比较上次和当前投票时间，参数都是毫秒级时间
	{
		int limitTime=60; //设置限制时间60分钟
		long count=today-temp;
		if (count<=limitTime*60*1000) return false;
		else return true;
	}
	public static String formatDate(long ms) //转换时间为指定格式
	{
		Date date = new Date(ms);
		SimpleDateFormat format = new SimpleDateFormat("yyyy-mm-dd HH:mm:ss");
		String strDate = format.format(date);
		return strDate;
	}
	public static String toChinese(String str) //解决乱码问题，转换为中文
	{
		if (str==null) str="";
		try {
			str=new String(str.getBytes("ISO-8859-1"),"gb2312");
		} catch (Exception e) {
			str="";
			e.printStackTrace();
		}
		return str;
	}
	public static String change(String str) //转换网页表单提交数据
	{
		str=str.replace("<","<");
		str=str.replace(">",">");
		return str;
	}
}

用户信息ValueBean

package com.yyqf.valuebean;

public class User {
	private String username;
	private String password;
	private String power;
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getPower() {
		return power;
	}
	public void setPower(String power) {
		this.power = power;
	}
	
}

ajax操作的JS封装

var net=new Object();		//定义一个全局变量net
net.AjaxRequest=function(url,onload,onerror,method,params){//创建一个构造函数
  this.req=null;
  this.onload=onload;
  this.onerror=(onerror) ? onerror : this.defaultError;
  this.loadDate(url,method,params);
}

net.AjaxRequest.prototype.loadDate=function(url,method,params){
  if (!method){
    method="GET";
  }
  if (window.XMLHttpRequest){
    this.req=new XMLHttpRequest();
  } else if (window.ActiveXObject){
    this.req=new ActiveXObject("Microsoft.XMLHTTP");
  }
  if (this.req){
    try{
      var loader=this;
      this.req.onreadystatechange=function(){
        net.AjaxRequest.onReadyState.call(loader);
      }
      this.req.open(method,url,true);
      //this.req.send(params);
	  this.req.send(null);
    }catch (err){
      this.onerror.call(this);
    }
  }
}


net.AjaxRequest.onReadyState=function(){	//重构onReadyState函数
  var req=this.req;
  var ready=req.readyState;
  if (ready==4){
    if (req.status==200 ){
      this.onload.call(this);
    }else{
      this.onerror.call(this);
    }
  }
}

net.AjaxRequest.prototype.defaultError=function(){	//默认的错误处理函数
  alert("error fetching data!"
    +"\n\nreadyState:"+this.req.readyState
    +"\nstatus: "+this.req.status
    +"\nheaders: "+this.req.getAllResponseHeaders());
}

登陆页面

<%@ page language="java" contentType="text/html; charset=gb2312"
    pageEncoding="gb2312"%>
<!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>登陆</title>
</head>
<body onload="setFocus()"> 
	<b><font size="10">逸雨清风系统登陆</font></b><hr/>
	<form id="form1" name="form1" method="post" action="login_deal2.jsp">
	<p>用户名: <input name="username" type="text" id="username"/></p>
	<script>
	function setFocus(){
		document.getElementById('username').focus();
	}
	</script>
	<p>密   码: <input name="password" type="password" id="password"/></p>
	<input type="submit" name="Submit" value="登陆">
	<input type="reset" name="Reset" value="清空">
	</form>
	
</body>
</html>

登录处理页面

<%@page import="com.yyqf.toolbean.MyTools"%>
<%@page import="java.sql.ResultSet"%>
<%@page import="com.yyqf.toolbean.DB"%>
<%@page import="java.awt.Button"%>
<%@ page language="java" contentType="text/html; charset=gb2312"
    pageEncoding="gb2312"%>
<!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>欢迎登陆</title>
</head>
<body>
			<script language="javascript" src="JS/AjaxRequest.js"></script>
			<script language="javascript">
			//此处需要加&nocache="+new Date().getTime()，否则将出不更新的情况
			function showUser(){
				var loader=new net.AjaxRequest("showUser.jsp?nocache="+new Date().getTime(),deal_User,onerror,"GET");
			}
			function onerror(){
				alert("很抱歉，服务器出现错误，当前窗口将关闭！");
				window.location("login.jsp");
			}
			function deal_User(){
				User.innerHTML=this.req.responseText;
			}
			</script>


	<jsp:useBean id="myDb" class="com.yyqf.toolbean.DB"/>
	<%!
		boolean login = false;
	%>
	<%
		String username = request.getParameter("username");
		String password = request.getParameter("password");
		//这里数据库返回的密码末尾的空格无法常规去除，特殊方法去除
		String sql="select replace(password,char(32),'') from Account_info where username='"+username+"'"; 
		ResultSet rstemp = myDb.getRs(sql);
		if ((rstemp.next() && rstemp.getString(1).equals(password)) || login == true) {
			if (login == true) username = (String)session.getAttribute("username");
			sql="select replace(power,char(32),'') from Account_info where username='"+username+"'"; 
			rstemp = myDb.getRs(sql);rstemp.next();
			out.println("<b><font size='10'>逸雨清风系统登陆</font></b><hr/> ");
			out.println("<b><font size='4'>   欢迎用户：</font></b>"+ username);
			if (rstemp.getString(1).equals("admin")) out.println("<br><b><font size='4'>   所在用户组：   管理员</font></b><br>");
			else out.println("<br><b><font size='4'>   所在用户组：   普通用户</font></b><br>");
			session.setAttribute("username", username);
			login = true;
		}else out.println("<script>alert('用户名或密码错误！');window.location('login.jsp');</script>");
	%>		
			<br/>   <a href="#" onClick="showUser();window.setInterval('showUser();',1000);"><font size="4">查看所有用户</font></a>
			   <a href="do_User.jsp?action=add"><font size="4">添加用户</font></a><br/>
	
		
		<br><div id="User"></div>
		
</body>
</html>

用户信息操作处理跳转页面

<%@page import="com.yyqf.valuebean.User"%>
<%@page import="java.util.ArrayList"%>
<%@ 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>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
        <jsp:useBean id="myDB" class="com.yyqf.toolbean.DB"/>
        <%
            String action = request.getParameter("action");
            String sql = null;
            if (action.equals("edit")){
        %>
            <form name="add" action="edit.jsp">
            用户名：&nbsp;&nbsp;<input type="text" name="username">
            密码： &nbsp;&nbsp;&nbsp;<input type="password" name="password">
            <input type="submit" name="Submit" value="确定">
            <input type="reset" name="Reset" value="清空">
            </form>
        <%
                response.sendRedirect("login_deal2.jsp");
            }else if (action.equals("delete")){ 
                sql = "delete from Account_info where username='"+request.getParameter("username")+"'";
                if (myDB.update(sql)<0) out.println("<script>alert('删除错误！')</script>");
                response.sendRedirect("login_deal2.jsp?");
            }else if (action.equals("add")){
        %>
            <form name="add" action="add.jsp">
            用户名：&nbsp;&nbsp;<input type="text" name="username">
            密码： &nbsp;&nbsp;&nbsp;<input type="password" name="password">
            <input type="submit" name="Submit" value="确定">
            <input type="reset" name="Reset" value="清空">
            </form>
        <% 
            }else response.sendRedirect("login.jsp");
        %>
        
</body>
</html>

显示用户信息

<%@page import="java.sql.ResultSet"%>
<%@page import="com.yyqf.valuebean.User"%>
<%@page import="java.util.ArrayList"%>
<%@ 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>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
		<table border="1" width="450" rules="none" cellspacing="0" cellpadding="0">
			<tr align="center" height="30" bgcolor="lightgrey">
			<td>用户名</td>
			<td>权限</td>
			<td>修改</td>
			<td>删除</td>
			</tr>
			
		<jsp:useBean id="myDb" class="com.yyqf.toolbean.DB"/>
		<%
			String sql = "select * from Account_info";
			ArrayList<User> Userlist = myDb.SelectAllUser(sql);
			for (int i=0;i<Userlist.size();i++){
				String power = null;
				sql="select replace(power,char(32),'') from Account_info where username='"+Userlist.get(i).getUsername()+"'";
				ResultSet temp = myDb.getRs(sql);temp.next();
				if (temp.getString(1).equals("admin")) power = "管理员";
				else power = "普通用户";
		%>		
			
			<tr height="35" align="center">
			<td><%=Userlist.get(i).getUsername()%></td>
			<td><%=power%></td>
			<td><a href="do_User.jsp?action=edit&username=<%=Userlist.get(i).getUsername()%>">修改</a></td>
			<td><a href="do_User.jsp?action=delete&username=<%=Userlist.get(i).getUsername()%>">删除</a></td>
			</tr>
		<%} %>
		</table>
</body>
</html>

添加用户

<%@ 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>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
		<jsp:useBean id="myDB" class="com.yyqf.toolbean.DB"></jsp:useBean>
		<%
			String username = request.getParameter("username");
			String password = request.getParameter("password");
			String sql = "insert into Account_info (username,password,power) values('"+username+"','"+password+"','common')";
			System.out.println(sql);
			if (myDB.update(sql)>0) response.sendRedirect("login_deal2.jsp");
			else out.println("<script>alert('添加错误');window.location('login_deal2.jsp');</script>");
		%>
</body>
</html>

[JSP]JDBC 用户登陆，查看修改添加用户

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