用纯JSP写的连接数据库操，具体包括数据查询、删除、修改，数据的添加在数据库里操作，数据库为MySQL 文件包括login.jsp,do_login.jsp(处理登录信息),index.jsp(显示登录用户名、密码和编辑删除操作),edit.jsp,do_edit.jsp,delete.jsp 登录页面 login.jsp vc
用纯JSP写的连接数据库操，具体包括数据查询、删除、修改，数据的添加在数据库里操作，数据库为MySQL
文件包括login.jsp,do_login.jsp(处理登录信息),index.jsp(显示登录用户名、密码和编辑删除操作),edit.jsp,do_edit.jsp,delete.jsp
登录页面
login.jsp喎?http://www.2cto.com/kf/ware/vc/" target="_blank" class="keylink">vcD4KPHA+PHByZSBjbGFzcz0="brush:sql;">
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<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<html>
<head>
<title>登录处理页面</title>
</head>
<body>
<%
request.setCharacterEncoding("gb2312");
response.setContentType("text/html;charset=gb2312");
String user=request.getParameter("username");
String pwd=request.getParameter("password");
final String DBDriver="com.mysql.jdbc.Driver";
final String DBUrl="jdbc:mysql://localhost:3306/mqsqltest";
final String DBUser="root";
final String DBPassword="686175";
Connection conn=null;
Statement stmt=null;
ResultSet rs=null;
Class.forName(DBDriver);
conn=DriverManager.getConnection(DBUrl,DBUser,DBPassword);
String sql="select * from user where username='"+user+"'&&password='"+pwd+"'";
stmt=conn.createStatement();
rs=stmt.executeQuery(sql);
if(rs.next()){
out.print("登录成功!");
response.setHeader("refresh","2;url=index.jsp");
}
else{
out.println("您登录的账号或密码错误!");
response.setHeader("refresh","2;url=login.jsp");
}
stmt.close();
conn.close();
%>
</body>
</html>
index.jsp
<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<html>
<head>
<title>数据列表</title>
</head>
<body>
<%
request.setCharacterEncoding("gb2312");
response.setContentType("text/html;charset=gb2312");
final String DBDriver="com.mysql.jdbc.Driver";
final String DBUrl="jdbc:mysql://localhost:3306/mqsqltest";
final String DBUser="root";
final String DBPassword="686175";
Connection conn=null;
Statement stmt=null;
ResultSet rs=null;
Class.forName(DBDriver);
conn=DriverManager.getConnection(DBUrl,DBUser,DBPassword);
String sql="select * from user";
stmt=conn.createStatement();
rs=stmt.executeQuery(sql);
%>
<table border="1">
<tr>
<td>编号</td>
<td>帐号</td>
<td>密码</td>
<td>编辑</td>
<td>删除</td>
</tr>
<%
while(rs.next()){
%>
<tr>
<td><%=rs.getInt(1) %></td>
<td><%=rs.getString(2) %></td>
<td><%=rs.getString(3) %></td>
<td><a href="edit.jsp?id=<%=rs.getInt(1)%>">更新</a></td>
<td><a href="delete.jsp?id=<%=rs.getInt(1)%>">删除</a></td>
</tr>
<%
}
stmt.close();
conn.close();
%>
</table>
</body>
</html>
编辑页面
编辑后
edit.jsp
<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<html>
<head>
<title>编辑页面</title>
</head>
<body>
<%
request.setCharacterEncoding("gb2312");
response.setContentType("text/html;charset=gb2312");
int id=Integer.parseInt(request.getParameter("id"));
session.setAttribute("id", id);
final String DBDriver="com.mysql.jdbc.Driver";
final String DBUrl="jdbc:mysql://localhost:3306/mqsqltest";
final String DBUser="root";
final String DBPassword="686175";
Connection conn=null;
Statement stmt=null;
ResultSet rs=null;
Class.forName(DBDriver);
conn=DriverManager.getConnection(DBUrl,DBUser,DBPassword);
String sql="select * from user where id='"+id+"'";
stmt=conn.createStatement();
rs=stmt.executeQuery(sql);
rs.next();
%>
<center>
<h3 id="编辑页面">编辑页面</h3>
<form action="do_edit.jsp" method="post">
<table>
<tr>
<td>帐号</td>
<td><input type="text" name="username" value=<%=rs.getString(2)%>></td>
</tr>
<tr>
<td>密码</td>
<td><input type="password" name="password" value=<%=rs.getString(3)%>></td>
</tr>
<tr>
<td></td>
<td>
<input type="submit" value="保存">
<input type="reset" value="取消">
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
处理编辑页面
do_edit.jsp
<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<%@ page import="java.util.*" %>
<html>
<head>
<title>编辑保存页面</title>
</head>
<body>
<%
request.setCharacterEncoding("gb2312");
response.setContentType("text/html;charset=gb2312");
int id=Integer.parseInt(session.getAttribute("id").toString());
String user=request.getParameter("username");
String pwd=request.getParameter("password");
final String DBDriver="com.mysql.jdbc.Driver";
final String DBUrl="jdbc:mysql://localhost:3306/mqsqltest";
final String DBUser="root";
final String DBPassword="686175";
Connection conn=null;
Statement stmt=null;
ResultSet rs=null;
Class.forName(DBDriver);
conn=DriverManager.getConnection(DBUrl,DBUser,DBPassword);
stmt=conn.createStatement();
if(user!=null&&pwd!=null){
String sql="update user set username='"+user+"',password='"+pwd+"' where id='"+id+"'";
stmt.executeUpdate(sql);
out.print("修改成功!");
response.setHeader("refresh","2;url=index.jsp");
}else{
out.print("帐号或密码不能为空!");
response.setHeader("refresh","2;url=edit.jsp");
}
%>
</body>
</html>
删除页面
delete.jsp
<%@ page language="java" import="java.sql.*" pageEncoding="utf-8"%>
<html>
<head>
<title>删除页面</title>
</head>
<body>
<%
request.setCharacterEncoding("gb2312");
response.setContentType("text/html;charset=gb2312");
int id=Integer.parseInt(request.getParameter("id"));
final String DBDriver="com.mysql.jdbc.Driver";
final String DBUrl="jdbc:mysql://localhost:3306/mqsqltest";
final String DBUser="root";
final String DBPassword="686175";
Connection conn=null;
Statement stmt=null;
Class.forName(DBDriver);
conn=DriverManager.getConnection(DBUrl,DBUser,DBPassword);
String sql="delete from user where id='"+id+"'";
stmt=conn.createStatement();
stmt.executeUpdate(sql);
stmt.close();
conn.close();
out.print("删除成功!");
response.setHeader("refresh","2;url=index.jsp");
%>
</body>
</html>
在编译运行前还的将MySQL的驱动包导入WebRoot/WEB-INF/lib下
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How to Add Users in MySQL: A Step-by-Step GuideMay 09, 2025 am 12:14 AMToaddusersinMySQLeffectivelyandsecurely,followthesesteps:1)UsetheCREATEUSERstatementtoaddanewuser,specifyingthehostandastrongpassword.2)GrantnecessaryprivilegesusingtheGRANTstatement,adheringtotheprincipleofleastprivilege.3)Implementsecuritymeasuresl
MySQL: Adding a new user with complex permissionsMay 09, 2025 am 12:09 AMToaddanewuserwithcomplexpermissionsinMySQL,followthesesteps:1)CreatetheuserwithCREATEUSER'newuser'@'localhost'IDENTIFIEDBY'password';.2)Grantreadaccesstoalltablesin'mydatabase'withGRANTSELECTONmydatabase.TO'newuser'@'localhost';.3)Grantwriteaccessto'
MySQL: String Data Types and CollationsMay 09, 2025 am 12:08 AMThe string data types in MySQL include CHAR, VARCHAR, BINARY, VARBINARY, BLOB, and TEXT. The collations determine the comparison and sorting of strings. 1.CHAR is suitable for fixed-length strings, VARCHAR is suitable for variable-length strings. 2.BINARY and VARBINARY are used for binary data, and BLOB and TEXT are used for large object data. 3. Sorting rules such as utf8mb4_unicode_ci ignores upper and lower case and is suitable for user names; utf8mb4_bin is case sensitive and is suitable for fields that require precise comparison.
MySQL: What length should I use for VARCHARs?May 09, 2025 am 12:06 AMThe best MySQLVARCHAR column length selection should be based on data analysis, consider future growth, evaluate performance impacts, and character set requirements. 1) Analyze the data to determine typical lengths; 2) Reserve future expansion space; 3) Pay attention to the impact of large lengths on performance; 4) Consider the impact of character sets on storage. Through these steps, the efficiency and scalability of the database can be optimized.
MySQL BLOB : are there any limits?May 08, 2025 am 12:22 AMMySQLBLOBshavelimits:TINYBLOB(255bytes),BLOB(65,535bytes),MEDIUMBLOB(16,777,215bytes),andLONGBLOB(4,294,967,295bytes).TouseBLOBseffectively:1)ConsiderperformanceimpactsandstorelargeBLOBsexternally;2)Managebackupsandreplicationcarefully;3)Usepathsinst
MySQL : What are the best tools to automate users creation?May 08, 2025 am 12:22 AMThe best tools and technologies for automating the creation of users in MySQL include: 1. MySQLWorkbench, suitable for small to medium-sized environments, easy to use but high resource consumption; 2. Ansible, suitable for multi-server environments, simple but steep learning curve; 3. Custom Python scripts, flexible but need to ensure script security; 4. Puppet and Chef, suitable for large-scale environments, complex but scalable. Scale, learning curve and integration needs should be considered when choosing.
MySQL: Can I search inside a blob?May 08, 2025 am 12:20 AMYes,youcansearchinsideaBLOBinMySQLusingspecifictechniques.1)ConverttheBLOBtoaUTF-8stringwithCONVERTfunctionandsearchusingLIKE.2)ForcompressedBLOBs,useUNCOMPRESSbeforeconversion.3)Considerperformanceimpactsanddataencoding.4)Forcomplexdata,externalproc
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