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【JSP+JDBC编程】实现简单的数据库增删改查

2016-05-12 09:27 302 查看

JSP+JDBC技术完成用户管理功能#

【1】主界面模块##

1）index.jsp###

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%@ page import="java.sql.*"%>

<html>
<head>

<title>My JSP 'index.jsp' starting page</title>

</head>

<body>
<%
String url = "jdbc:mysql://localhost:3306/testdb"; //数据库连接串
Class.forName("org.gjt.mm.mysql.Driver").newInstance(); //加载驱动程序
Connection conn = DriverManager.getConnection(url, "root", "root"); //建立连接
String sql = "select * from users";
PreparedStatement pStmt = conn.prepareStatement(sql);
ResultSet rs = pStmt.executeQuery();
%>
<table border="1" width="500">
<tr>
<th>编号</th>
<th>姓名</th>
<th>密码</th>
<th colspan="2">操作</th>
</tr>
<%
while (rs.next()) {
%>

<tr>
<td>
<%
out.print(rs.getString("id"));
%>
</td>
<td>
<%
out.print(rs.getString("username"));
%>
</td>
<td>
<%
out.print(rs.getString("password"));
%>
</td>
<td><a href="delete.jsp?id=<%=rs.getString("id")%>"  onclick="return confirm('确定删除该条记录?')">删除</a></td>
<td><a href="edit.jsp?id=<%=rs.getString("id")%>">编辑</a></td>
</tr>
<%
}
%>

</table>
</br>
<a href="register.jsp">添加新记录</a>

<%
//关闭
rs.close();
pStmt.close();
conn.close();
%>

</body>
</html>

新建模块##

1）register.jsp###

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>

<html>
<head>

<title>My JSP 'register.jsp' starting page</title>

</head>

<body>

<form action="add.jsp">
姓名：<input type="text" name="username"/><br>
密码：<input type="text" name="password"/><br><br>
<input type="submit" value="添加" />
</form>

</body>
</html>

2）add.jsp###

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%@ page import="java.sql.*"%>

<html>
<head>

<title>My JSP 'add.jsp' starting page</title>

</head>

<body>

<%
String url = "jdbc:mysql://localhost:3306/testdb"; //数据库连接串
Class.forName("org.gjt.mm.mysql.Driver").newInstance(); //加载驱动程序
Connection conn = DriverManager.getConnection(url, "root", "root"); //建立连接

String sql = "insert into users values(null,?,?)";
PreparedStatement pStmt = conn.prepareStatement(sql);

String username = request.getParameter("username");
String password = request.getParameter("password");
pStmt.setString(1, username);
pStmt.setString(2, password);

int cnt = pStmt.executeUpdate();
if (cnt > 0) {
response.sendRedirect("index.jsp");
} else {
out.print("用户已存在，<a href='register.jsp'>重新注册</a>");
}

//关闭
pStmt.close();
conn.close();
%>

</body>
</html>

编辑模块##

1）edit.jsp###

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%@ page import="java.sql.*"%>

<html>
<head>

<title>My JSP 'edit.jsp' starting page</title>

</head>

<body>

<%
String url = "jdbc:mysql://localhost:3306/testdb"; //数据库连接串
Class.forName("org.gjt.mm.mysql.Driver").newInstance(); //加载驱动程序
Connection conn = DriverManager.getConnection(url, "root", "root"); //建立连接

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

String sql = "select * from users where id=?";
PreparedStatement pStmt = conn.prepareStatement(sql);
pStmt.setString(1, id);
ResultSet rs = pStmt.executeQuery();
while (rs.next()) {
username = rs.getString("username");
password = rs.getString("password");
}
%>

<form action="modify.jsp">
编号：<input type="text" name="id" readonly="readonly" value="<%=id %>" /><br>
姓名：<input type="text" name="username" value="<%=username %>"  /><br>
密码：<input type="text" name="password"  value="<%=password %>"/><br><br>
<input type="submit" value="修改" />
</form>

<%
//关闭
pStmt.close();
conn.close();

%>

</body>
</html>

2）modify.jsp###

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%@ page import="java.sql.*"%>

<html>
<head>

<title>My JSP 'modify.jsp' starting page</title>

</head>

<body>
<%
String url = "jdbc:mysql://localhost:3306/testdb"; //数据库连接串
Class.forName("org.gjt.mm.mysql.Driver").newInstance(); //加载驱动程序
Connection conn = DriverManager.getConnection(url, "root", "root"); //建立连接

String sql = "update users set username=?,password=? where id=?";
PreparedStatement pStmt = conn.prepareStatement(sql);

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

pStmt.setString(1, username);
pStmt.setString(2, password);
pStmt.setString(3, id);

pStmt.executeUpdate();

//关闭
pStmt.close();
conn.close();

response.sendRedirect("index.jsp");
%>

</body>
</html>

删除模块##

1）delete.jsp###

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%@ page import="java.sql.*"%>

<html>
<head>

<title>My JSP 'delete.jsp' starting page</title>

</head>

<body>
<%
String url = "jdbc:mysql://localhost:3306/testdb"; //数据库连接串
Class.forName("org.gjt.mm.mysql.Driver").newInstance(); //加载驱动程序
Connection conn = DriverManager.getConnection(url, "root", "root"); //建立连接

String sql = "delete from users where id=?";
PreparedStatement pStmt = conn.prepareStatement(sql);

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

pStmt.setString(1, id);
pStmt.executeUpdate();

//关闭
pStmt.close();
conn.close();

response.sendRedirect("index.jsp");
%>
</body>
</html>

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