javaweb学习第6篇 - 学会使用JSP+Servlet+Javabean模式进行简单的业务系统开发

xiaoxiao2022-07-04 116

目标：学会使用JSP+Servlet+Javabean模式进行简单的业务系统开发

新建两张父子表：1、学生表 2、学生发表的论文表

实现学生基本信息增删改查，针对某一个学生、对发表的论文进行增删改查，

说明：不允许使用其它框架，纯粹使用Model1(JSP+Servlet+Javabean)来进行开发

1.创建index.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8" import="java.sql.*"%>

a:link,a:visited{

color:#0044DD;

text:-decoration:none;}

table th{

color:#2467fa;

background:#dadada;

font-size:16px;

border:1px solid #fffff;

}

table td{

background:#dadada;

text-align:center;

border-align:1px solid #ffffff;

}

</style>

</head>

<body>

<h1 style="font-family:仿宋">账号信息管理系统</h1>

Class.forName("com.mysql.cj.jdbc.Driver");

//Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/user","root","root");

Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?characterEncoding=utf-8&serverTimezone=GMT+8","root","laotu123");

String sql = "select * from userinfo";

Statement stmt = con.createStatement();

ResultSet rs = stmt.executeQuery(sql);

while(rs.next()) {

</td>

</tr>

}

rs.close();

stmt.close();

con.close();

</table>

<br>

</div>

</body>

</html>

2.创建login.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%>

a:link,a:visited{

color:#0044DD;

text:-decoration:none;}

table th{

color:#2467fa;

background:#dadada;

font-size:16px;

border:1px solid #fffff;

}

table td{

background:#dadada;

text-align:center;

border-align:1px solid #ffffff;

}

</style>

</head>

<body>

<h1 style="font-family:仿宋">账号信息管理系统</h1>

</tr>

</tr>

</tr>

</table>

</form>

<br>

</div>

</body>

</html>

3.创建login_success.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8" import="java.sql.*" %>

a:link,a:visited{

color:#0044DD;

text:-decoration:none;}

table th{

color:#2467fa;

background:#dadada;

font-size:16px;

border:1px solid #fffff;

}

table td{

background:#dadada;

text-align:center;

border-align:1px solid #ffffff;

}

</style>

</head>

<body>

<%String name1 = (String)session.getAttribute("username");

if(name1 == null) {

String mgs = "您尚未登陆，请先登陆，3秒后跳转登陆界面!";%>

<%=mgs %>

response.setHeader("Refresh", "3;login.jsp");

}

else{

<h1 style="font-family:仿宋">账号信息管理系统</h1>

Class.forName("com.mysql.cj.jdbc.Driver");

//Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/user","root","root");

Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?characterEncoding=utf-8&serverTimezone=GMT+8","root","laotu123");

String sql = "select * from userinfo";

Statement stmt = con.createStatement();

ResultSet rs = stmt.executeQuery(sql);

while(rs.next()) {

<td><input type="button" onclick="window.location.href='edit.jsp?name=<%=rs.getString("name") %>'" value="修改">

<a href="del.jsp?name=<%=rs.getString("name") %>" onclick="return confirm('确定删除吗？')"><input type = "button" value="删除"></a>

</td>

</tr>

}

rs.close();

stmt.close();

con.close();

</table>

<br>

<tr>

</tr>

</table>

<br>

</div>

<%} %>

</body>

</html>

创建login_out.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%>

<title>退出登陆处理界面</title>

</head>

<body>

<%session.setAttribute("username",null);

String mgs = "退出成功，3秒后跳转到主界面!";%>

<% response.setHeader("Refresh", "3;index.jsp");%>

</body>

</html>

创建login_do.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8" import="java.sql.*"%>

<title>登陆验证页面</title>

</head>

<body>

request.setCharacterEncoding("UTF-8");

String name = request.getParameter("username");

String password = request.getParameter("password");

String sql = "select count(*) from userinfo where name = ? and password = ?";

Class.forName("com.mysql.cj.jdbc.Driver");

//Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/user","root","root");

Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?characterEncoding=utf-8&serverTimezone=GMT+8","root","laotu123");

PreparedStatement pstmt = con.prepareStatement(sql);

pstmt.setString(1, name);

pstmt.setString(2,password);

ResultSet rs = pstmt.executeQuery();

String a = "1";

while(rs.next()) {

if(a.equals(rs.getString("count(*)"))) {

session.setAttribute("username", name);

<jsp:forward page="login_success.jsp"></jsp:forward>

<% }

else {

String mgs = "登录失败，3秒后跳转到主界面!";%>

<%=mgs %>

response.setHeader("Refresh", "3;index.jsp");

}

rs.close();

pstmt.close();

con.close();

</body>

</html>

创建query.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%>

a:link,a:visited{

color:#0044DD;

text:-decoration:none;}

table th{

color:#2467fa;

background:#dadada;

font-size:16px;

border:1px solid #fffff;

}

table td{

background:#dadada;

text-align:center;

border-align:1px solid #ffffff;

}

</style>

</head>

<body>

request.setCharacterEncoding("UTF-8");

String name1 = (String)session.getAttribute("username");%>

<h1 style="font-family:仿宋">账号信息管理系统</h1>

<h2 style="font-family:仿宋"><%=name1 %>,欢迎您查询信息!</h2>

<h3 style="font-family:仿宋">请输入您要查询的用户名!</h2>

</table>

</form>

<br>

</div>

</body>

</html>

创建query_do.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8" import="java.sql.*"%>

a:link,a:visited{

color:#0044DD;

text:-decoration:none;}

table th{

color:#2467fa;

background:#dadada;

font-size:16px;

border:1px solid #fffff;

}

table td{

background:#dadada;

text-align:center;

border-align:1px solid #ffffff;

}

</style>

<title>查询处理页面</title>

</head>

<body>

<% request.setCharacterEncoding("UTF-8");

String name = request.getParameter("username1");

Class.forName("com.mysql.cj.jdbc.Driver");

//Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/user","root","root");

Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?characterEncoding=utf-8&serverTimezone=GMT+8","root","laotu123");

String sql = "select * from userinfo ";

Statement pstmt = con.createStatement();

ResultSet rs = pstmt.executeQuery(sql);

boolean flag = true;

while(rs.next()) {

if(name.equals(rs.getString("name"))) {

flag = false;

String username = rs.getString("name");

String password = rs.getString("password");

String age = rs.getString("age");

<h1 style="font-family:仿宋">账号信息管理系统</h1>

<h3 style="font-family:仿宋">查找成功，您查找的用户信息如下：</h3>

</table>

<%}

}

if(flag) {

String mgs = "查询失败，3秒后跳转到登陆成功界面!";%>

response.setHeader("Refresh", "3;login_success.jsp");}

pstmt.close();

con.close();

</body>

</html>

创建query_paper.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8" import="java.sql.*" %>

a:link,a:visited{

color:#0044DD;

text:-decoration:none;}

table th{

color:#2467fa;

background:#dadada;

font-size:16px;

border:1px solid #fffff;

}

table td{

background:#dadada;

text-align:center;

border-align:1px solid #ffffff;

}

</style>

</head>

<body>

request.setCharacterEncoding("UTF-8");

String name1 = (String)session.getAttribute("username");

if(name1 == null) {

String mgs = "您尚未登陆，请先登陆，3秒后跳转登陆界面!";%>

<%=mgs %>

response.setHeader("Refresh", "3;login.jsp");

}

else{

<h1 style="font-family:仿宋">学生论文信息管理</h1>

Class.forName("com.mysql.cj.jdbc.Driver");

//Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/user","root","root");

Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?characterEncoding=utf-8&serverTimezone=GMT+8","root","laotu123");

String sql = "select * from userpaper";

Statement stmt = con.createStatement();

ResultSet rs = stmt.executeQuery(sql);

while(rs.next()) {

<td><input type="button" onclick="window.location.href='edit_paper.jsp?paper=<%=rs.getString("paper") %>'" value="修改">

<a href="del_paper.jsp?paper=<%=rs.getString("paper") %>" onclick="return confirm('确定删除吗？')"><input type = "button" value="删除"></a>

</td>

</tr>

}

rs.close();

stmt.close();

con.close();

</table>

<br>

<tr>

</tr>

</table>

<br>

</div>

<%} %>

</body>

</html>

创建query_query_paper.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%>

a:link,a:visited{

color:#0044DD;

text:-decoration:none;}

table th{

color:#2467fa;

background:#dadada;

font-size:16px;

border:1px solid #fffff;

}

table td{

background:#dadada;

text-align:center;

border-align:1px solid #ffffff;

}

</style>

</head>

<body>

request.setCharacterEncoding("UTF-8");

String name1 = (String)session.getAttribute("username");%>

<h1 style="font-family:仿宋">账号信息管理系统</h1>

<h2 style="font-family:仿宋"><%=name1 %>,欢迎您查询信息!</h2>

<h3 style="font-family:仿宋">请输入您要查询的用户名!</h2>

</table>

</form>

<br>

</div>

</body>

</html>

创建query_query_paper_do.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8" import="java.sql.*"%>

a:link,a:visited{

color:#0044DD;

text:-decoration:none;}

table th{

color:#2467fa;

background:#dadada;

font-size:16px;

border:1px solid #fffff;

}

table td{

background:#dadada;

text-align:center;

border-align:1px solid #ffffff;

}

</style>

<title>查询处理页面</title>

</head>

<body>

<% request.setCharacterEncoding("UTF-8");

String paper = request.getParameter("userpaper1");

Class.forName("com.mysql.cj.jdbc.Driver");

//Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/user","root","root");

Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?characterEncoding=utf-8&serverTimezone=GMT+8","root","laotu123");

String sql = "select * from userpaper ";

Statement pstmt = con.createStatement();

ResultSet rs = pstmt.executeQuery(sql);

boolean flag = true;

while(rs.next()) {

if(paper.equals(rs.getString("paper"))) {

flag = false;

String username = rs.getString("name");

String userpaper = rs.getString("paper");

<h1 style="font-family:仿宋">论文信息管理</h1>

<h3 style="font-family:仿宋">查找成功，您查找的论文信息如下：</h3>

</table>

<%}

}

if(flag) {

String mgs = "查询失败，3秒后跳转到登陆成功界面!";%>

response.setHeader("Refresh", "3;query_paper.jsp");}

pstmt.close();

con.close();

</body>

</html>

创建edit.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8" import="java.sql.*"%>

a:link,a:visited{

color:#0044DD;

text:-decoration:none;}

table th{

color:#2467fa;

background:#dadada;

font-size:16px;

border:1px solid #fffff;

}

table td{

background:#dadada;

text-align:center;

border-align:1px solid #ffffff;

}

</style>

<title>修改用户信息</title>

</head>

<body>

<% String name1 = (String)session.getAttribute("username");

String name = request.getParameter("name");

request.setCharacterEncoding("UTF-8");

String sql = "select * from userinfo where name = ?";

Class.forName("com.mysql.cj.jdbc.Driver");

Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?characterEncoding=utf-8&serverTimezone=GMT+8","root","laotu123");

PreparedStatement pstmt = con.prepareStatement(sql);

pstmt.setString(1, name);

ResultSet rs = pstmt.executeQuery();

if(rs.next()) {

String username = rs.getString("name");

String password = rs.getString("password");

String age = rs.getString("age");

<h1 style="font-family:仿宋">账号信息管理系统</h1>

<h2 style="font-family:仿宋"><%=name1 %>,欢迎您修改<%=name %>的信息!</h2>

<form name = "form1" action = "edit_do.jsp?name=<%=name %>" method="POST">

</tr>

</tr>

</tr>

</tr>

</table>

</form>

<br>

}

rs.close();

pstmt.close();

con.close();

</body>

</html>

12创建edit_paper.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8" import="java.sql.*"%>

a:link,a:visited{

color:#0044DD;

text:-decoration:none;}

table th{

color:#2467fa;

background:#dadada;

font-size:16px;

border:1px solid #fffff;

}

table td{

background:#dadada;

text-align:center;

border-align:1px solid #ffffff;

}

</style>

<title>修改用户信息</title>

</head>

<body>

request.setCharacterEncoding("UTF-8");

String name1 = (String)session.getAttribute("username");

String paper = request.getParameter("paper");

String sql = "select * from userpaper where paper = ?";

Class.forName("com.mysql.cj.jdbc.Driver");

Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?characterEncoding=utf-8&serverTimezone=GMT+8","root","laotu123");

PreparedStatement pstmt = con.prepareStatement(sql);

pstmt.setString(1, paper);

ResultSet rs = pstmt.executeQuery();

if(rs.next()) {

String username = rs.getString("name");

String userpaper = rs.getString("paper");

<h1 style="font-family:仿宋">账号信息管理系统</h1>

<h2 style="font-family:仿宋"><%=name1 %>,欢迎您修改<%=paper %>的信息!</h2>

<form name = "form1" action = "edit_paper_do.jsp?paper=<%=paper %>" method="POST">

</tr>

</tr>

</tr>

</table>

</form>

<br>

}

rs.close();

pstmt.close();

con.close();

</body>

</html>

创建edit_paper_do.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8" import="java.sql.*"%>

<title>修改处理页面</title>

</head>

<body>

request.setCharacterEncoding("UTF-8");

String paper1 = request.getParameter("paper");

String name = request.getParameter("username");

String paper = request.getParameter("userpaper");

String sql = "update userpaper set name=?,paper=? where paper =?";

Class.forName("com.mysql.cj.jdbc.Driver");

//Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/user","root","root");

Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT+8","root","laotu123");

PreparedStatement pstmt = con.prepareStatement(sql);

pstmt.setString(1, name);

pstmt.setString(2, paper);

pstmt.setString(3, paper1);

int result = pstmt.executeUpdate();

if ( result == 1) {

String mgs = "修改成功，3秒后跳转到登陆成功界面!";%>

response.setHeader("Refresh", "3;query_paper.jsp");

}else {

String mgs = "修改失败，3秒后跳转到登陆成功界面!";%>

response.setHeader("Refresh", "3;query_paper.jsp");

}

pstmt.close();

con.close();

</body>

</html>

创建edit_do.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8" import="java.sql.*"%>

<title>修改处理页面</title>

</head>

<body>

String name1 = request.getParameter("name");

request.setCharacterEncoding("UTF-8");

String name = request.getParameter("username");

String password = request.getParameter("password");

String age = request.getParameter("age");

String sql = "update userinfo set name=?,password=?,age=? where name =?";

Class.forName("com.mysql.cj.jdbc.Driver");

//Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/user","root","root");

Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?characterEncoding=utf-8&serverTimezone=GMT+8","root","laotu123");

PreparedStatement pstmt = con.prepareStatement(sql);

pstmt.setString(1, name);

pstmt.setString(2,password);

pstmt.setString(3,age);

pstmt.setString(4,name1);

int result = pstmt.executeUpdate();

if ( result == 1) {

String mgs = "修改成功，3秒后跳转到登陆成功界面!";%>

response.setHeader("Refresh", "3;login_success.jsp");

}else {

String mgs = "修改失败，3秒后跳转到登陆成功界面!";%>

response.setHeader("Refresh", "3;login_success.jsp");

}

pstmt.close();

con.close();

</body>

</html>

创建del.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8" import="java.sql.*"%>

<title>删除处理页面</title>

</head>

<body>

<% request.setCharacterEncoding("UTF-8");

String name1 = request.getParameter("name");

String name2 = (String)session.getAttribute("username");

if(name1.equals(name2)) {

<h1 style="font-family:仿宋">账号信息管理系统</h1>

<h3 style="font-family:仿宋">不好意思，您正在删除自己的信息，请先退出登陆!</h3>

<br>

<%}else{

String sql = "delete from userinfo where name=?";

Class.forName("com.mysql.cj.jdbc.Driver");

//Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/user","root","root");

Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?characterEncoding=utf-8&serverTimezone=GMT+8","root","laotu123");

PreparedStatement pstmt = con.prepareStatement(sql);

pstmt.setString(1, name1);

int result = pstmt.executeUpdate();

if ( result == 1) {

String mgs = "删除成功，3秒后跳转到登陆成功界面!";%>

response.setHeader("Refresh", "3;login_success.jsp");

}else {

String mgs = "删除失败，3秒后跳转到登陆成功界面!";%>

response.setHeader("Refresh", "3;login_success.jsp");

}pstmt.close();

con.close();

}

</body>

</html>

创建del_paper.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8" import="java.sql.*"%>

<title>删除处理页面</title>

</head>

<body>

<% request.setCharacterEncoding("UTF-8");

String paper = request.getParameter("paper");

String sql = "delete from userpaper where paper=?";

Class.forName("com.mysql.cj.jdbc.Driver");

//Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/user","root","root");

Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?serverTimezone=GMT+8","root","laotu123");

PreparedStatement pstmt = con.prepareStatement(sql);

pstmt.setString(1, paper);

int result = pstmt.executeUpdate();

if ( result == 1) {

String mgs = "删除成功，3秒后跳转到论文信息管理界面!";%>

response.setHeader("Refresh", "3;query_paper.jsp");

}else {

String mgs = "删除失败，3秒后跳转到论文信息管理界面!";%>

response.setHeader("Refresh", "3;query_paper.jsp");

}

pstmt.close();

con.close();

</body>

</html>

创建add.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%>

a:link,a:visited{

color:#0044DD;

text:-decoration:none;}

table th{

color:#2467fa;

background:#dadada;

font-size:16px;

border:1px solid #fffff;

}

table td{

background:#dadada;

text-align:center;

border-align:1px solid #ffffff;

}

</style>

</head>

<body>

<%String name1 = (String)session.getAttribute("username");%>

<h1 style="font-family:仿宋">账号信息管理系统</h1>

<h2 style="font-family:仿宋"><%=name1 %>,欢迎您添加新用户!</h2>

</table>

</form>

<br>

</div>

</body>

</html>

创建add_paper.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%>

a:link,a:visited{

color:#0044DD;

text:-decoration:none;}

table th{

color:#2467fa;

background:#dadada;

font-size:16px;

border:1px solid #fffff;

}

table td{

background:#dadada;

text-align:center;

border-align:1px solid #ffffff;

}

</style>

</head>

<body>

<%String name1 = (String)session.getAttribute("username");%>

<h1 style="font-family:仿宋">账号信息管理系统</h1>

<h2 style="font-family:仿宋"><%=name1 %>,欢迎您添加新用户!</h2>

</table>

</form>

<br>

</div>

</body>

</html>

18.创建add_do.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8" import="java.sql.*"%>

<title>增加处理页面</title>

</head>

<body>

<%String name1 = (String)session.getAttribute("username");

request.setCharacterEncoding("UTF-8");

String name = request.getParameter("newname");

String password = request.getParameter("newpassword");

String age = request.getParameter("newage");

String sql = "insert into userinfo value(null,?,?,?)";

Class.forName("com.mysql.cj.jdbc.Driver");

Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student?serverTimezone=GMT+8","root","laotu123");

PreparedStatement pstmt = con.prepareStatement(sql);

pstmt.setString(1, name);

pstmt.setString(2,password);

pstmt.setString(3,age);

int result = pstmt.executeUpdate();

if ( result == 1) {

String mgs = "添加成功，3秒后跳转到登陆成功界面!";%>

response.setHeader("Refresh", "3;login_success.jsp");

}else {

String mgs = "添加失败，3秒后跳转到登陆成功界面!";%>

response.setHeader("Refresh", "3;login_success.jsp");

}

pstmt.close();

con.close();

</body>

</html>

测试：

创建数据库student，及创建userinfo表及userpaper表

进入账号信息管理系统

登陆

登陆成功

修改信息

删除信息

删除成功

查询userinfo表信息

查询成功

插入新用户

插入成功

查询论文信息

修改信息

修改成功

增添新论文

添加成功

删除论文

删除成功

退出系统

在实验过程中我遇到了修改论文表时上传数据为乱码问题

通过百度的方式，我发现自己的 request.setCharacterEncoding("UTF-8");不是放在最开头，使得在此之前就获取数据，使得上床中文时有论文，而其他方式的数据没有乱码，我把它放在开头解决了这个问题。

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