eclipse连接mysql数据库实现怎删改查操作实例（附带源码）
package model;
public class User {
private int id;
private String name;
private String password;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
package dao;
import java.util.List;
import model.User;
public interface IUser {
public void add(User user);
public void delete(int id);
public void update(User user);
public User load(int id);
public List<User> load();
public List<User> load(String content);
}
package dao; import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List; import com.sun.xml.internal.bind.v2.runtime.Name; import model.User;
import util.DBUtil;
import util.UserException; public class UserImp implements IUser{ public void add(User user) { Connection connection=DBUtil.getConnection(); String sql = "select count(*) from t_user where name = ?";//准备sql语句 PreparedStatement preparedStatement = null;
ResultSet resultSet = null; try {
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setString(1, user.getName()); resultSet = preparedStatement.executeQuery(); while(resultSet.next()) {
if (resultSet.getInt(1) > 0) {
throw new UserException("用户已存在") ;
}
} String sql1 = "insert into t_user(name,password) value (?,?)";
preparedStatement = connection.prepareStatement(sql1);
preparedStatement.setString(1, user.getName());
preparedStatement.setString(2, user.getPassword());
preparedStatement.executeUpdate();
} catch (SQLException e) { e.printStackTrace();
}finally { DBUtil.close(resultSet);
DBUtil.close(preparedStatement);
DBUtil.close(connection);
} } public void delete(int id) {
Connection connection = DBUtil.getConnection();
String sql = "delete from t_user where id = ?";
PreparedStatement preparedStatement = null; try {
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setInt(1, id);
preparedStatement.executeUpdate();
} catch (SQLException e) { e.printStackTrace();
}finally {
DBUtil.close(preparedStatement);
DBUtil.close(connection);
} } public void update(User user) { Connection connection = DBUtil.getConnection();
//准备sql语句
String sql = "update t_user set name = ? , password=? where id = ?";
//创建语句传输对象
PreparedStatement preparedStatement = null;
try {
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setString(1, user.getName());
preparedStatement.setString(2, user.getPassword());
preparedStatement.setInt(3, user.getId());
preparedStatement.executeUpdate();
} catch (SQLException e) { e.printStackTrace();
}finally {
DBUtil.close(preparedStatement);
DBUtil.close(connection);
} } public User load(int id) {
Connection connection = DBUtil.getConnection();
//准备sql语句
String sql = "select * from t_user where id = ?";
//创建语句传输对象
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;
User user = null;
try {
preparedStatement = connection.prepareStatement(sql); preparedStatement.setInt(1, id);
resultSet = preparedStatement.executeQuery();
while(resultSet.next()) {
user = new User();
user.setId(id);
user.setName(resultSet.getString("name"));;
user.setPassword(resultSet.getString("password")); }
} catch (SQLException e) { e.printStackTrace();
}finally {
DBUtil.close(resultSet);
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
return user;
} @Override
public List<User> load() {
Connection connection = DBUtil.getConnection();
//准备sql语句
String sql = "select * from t_user ";
//创建语句传输对象
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;
//集合中只能放入user对象
List<User> users = new ArrayList<User>();
User user = null;
try { preparedStatement = connection.prepareStatement(sql); resultSet = preparedStatement.executeQuery();
while(resultSet.next()) {
user = new User();
user.setId(resultSet.getInt("id"));
user.setName(resultSet.getString("name"));
user.setPassword(resultSet.getString("password")); users.add(user);
}
} catch (SQLException e) { e.printStackTrace();
}finally {
DBUtil.close(resultSet);
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
return users;
} @Override
public List <User> load(String content) {
Connection connection = DBUtil.getConnection();
//准备sql语句
String sql = "select * from t_user ";
//创建语句传输对象
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;
//集合中只能放入user对象
List<User> users = new ArrayList<User>();
User user = null;
try {
if (content == null || "".equals(content)) {
preparedStatement = connection.prepareStatement(sql);
}else {
sql += "where name like ? ";
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setString(1, "%"+ content +"%"); }
resultSet = preparedStatement.executeQuery();
while(resultSet.next()) {
user = new User();
user.setId(resultSet.getInt("id"));
user.setName(resultSet.getString("name"));
user.setPassword(resultSet.getString("password")); users.add(user);
}
} catch (SQLException e) { e.printStackTrace();
}finally {
DBUtil.close(resultSet);
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
return users;
}
}
package filter; import java.io.IOException; import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse; public class CharFilter implements Filter{
String encoding = null;
public void init(FilterConfig filterConfig) throws ServletException {
encoding = filterConfig.getInitParameter("encoding");
} public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException { request.setCharacterEncoding(encoding);
chain.doFilter(request, response);
} public void destroy() { }
}
package util; import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException; public class DBUtil { public static Connection getConnection() {
/*
* 加载驱动
*/
try { Class.forName("com.mysql.jdbc.Driver").newInstance();
} catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) { e.printStackTrace();
}
String user = "root";
String password = "root";
String url = "jdbc:mysql://localhost:3306/mysql";
/*
* 创建连接对象
*/
Connection connection = null;
try { connection = DriverManager.getConnection(url,user,password);
} catch (SQLException e) { e.printStackTrace();
}
return connection;
}
/*
* 关闭资源的方法
*/ public static void close(Connection connection) {//关闭连接对象的方法
try {
if (connection != null) {
connection.close();
} } catch (SQLException e) { e.printStackTrace();
}
}
public static void close(PreparedStatement preparedStatement ) {//关闭语句传输对象的方法
try {
if (preparedStatement != null) {
preparedStatement.close();
} } catch (SQLException e) { e.printStackTrace();
}
}
public static void close(ResultSet resultSet ) {//关闭结果集的方法
try {
if (resultSet != null) {
resultSet.close();
} } catch (SQLException e) { e.printStackTrace();
}
} }
package util; public class UserException extends RuntimeException
{ public UserException() {
super();
// TODO Auto-generated constructor stub
} public UserException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
super(message, cause, enableSuppression, writableStackTrace);
// TODO Auto-generated constructor stub
} public UserException(String message, Throwable cause) {
super(message, cause);
// TODO Auto-generated constructor stub
} public UserException(String message) {
super(message);
// TODO Auto-generated constructor stub
} public UserException(Throwable cause) {
super(cause);
// TODO Auto-generated constructor stub
} }
<%@page import="com.sun.org.apache.xalan.internal.xsltc.compiler.sym"%>
<%@page import="dao.UserImp"%>
<%@page import="model.User"%>
<%@ 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>
<%
String name=(String)request.getParameter("username");
String password=(String)request.getParameter("pass");
User user=new User();
user.setName(name);
user.setPassword(password); System.out.print(user.getName());
System.out.print(user.getPassword()); UserImp userImp=new UserImp();
try{
userImp.add(user);}catch(Exception e){} response.sendRedirect("list.jsp");
%> <h2>添加成功！</h2> </html>
<%@ 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>
<form action="add.jsp" method="post">
<table border="1" bordercolor="#FFFF33" align="center" >
<tr> <td align="right" colspan="2">用户名<input type="text" name="username" style="width:100px;" /></td><br> </tr>
<tr>
<td align="right" colspan="2">密 码<input type="password" name="pass" style="width:100px;"/></td>
</tr>
<tr>
<td align="left" style="width:60px;height:10px;font-size:10px;">没有用户名?<a href="register.jsp">[注册]</a>一个吧</td> <td align="right"><input type="submit" value="添加"style="width:100px;height:30px;font-size:16px;"/></td> </tr> </table> </form> </body>
</html>
<%@page import="model.User"%>
<%@page import="dao.UserImp"%>
<%@ 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>
<%
int id = Integer.parseInt(request.getParameter("id"));
UserImp userImp=new UserImp();
User user=new User();
userImp.delete(id);
response.sendRedirect("list.jsp");
%> </html>
<%@page import="model.User"%>
<%@page import="java.util.List"%>
<%@page import="dao.UserImp"%>
<%@ 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>
<%
UserImp userDao = new UserImp();
String content=request.getParameter("content");
if(content==null||"".equals(content)){
content="";} List<User> users = userDao.load(content); %>
</head>
<a href="addInput.jsp">继续添加</a>
<body>
<table align="center" border="1" width="500">
<tr align="center">
<td colspan="5" >增删改查</td>
</tr>
<tr>
<form action="list.jsp" method="post">
<td colspan="4">
请输入用户名 :
<input type="text" name="content" size="40" value="<%=content%>"/>
<input type="submit" value="搜索" />
</td>
</form>
</tr> <tr>
<td>用户编号</td>
<td>用户名</td>
<td>用户密码</td>
<td colspan="2"> 用户操作</td>
</tr>
<%
for( User user : users ){
%>
<tr>
<td> <%=user.getId() %></td>
<td> <%=user.getName()%></td>
<td> <%=user.getPassword() %></td> <td> <a href="delete.jsp?id=<%=user.getId() %>" >删除</a></td>
<td> <a href="update.jsp?id=<%=user.getId() %>" >更新</a></td> </tr>
<%
}
%>
</table> </body> </html>
<%@ 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>
<form action="addInput.jsp" method="post">
<table border="1" bordercolor="#FFFF33" align="center" >
<tr> <td align="right" colspan="1">用户名<input type="text" name="username" style="width:100px;" /></td><br> </tr>
<tr>
<td align="right" colspan="1">密 码<input type="password" name="pass" style="width:100px;"/></td>
</tr>
<tr>
<td align="right" colspan="1">确认密码<input type="password" name="pass1" style="width:100px;"/></td>
</tr>
<tr>
<td align="right" colspan="1">手机号<input type="text" name="phone" style="width:100px;"/></td>
</tr>
<tr> <td align="right"><input type="submit" value="注册"style="width:100px;height:30px;font-size:16px;"/></td> </tr> </table> </form> </body> </html>
<%@page import="model.User"%>
<%@page import="dao.UserImp"%>
<%@ 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>
<%
int id = Integer.parseInt(request.getParameter("id"));
UserImp userImp=new UserImp();
User user=new User();
user=userImp.load(id);
%>
</head>
<body>
<form action="update1.jsp" method="post">
<table border="1" bordercolor="#FFFF33" align="center" >
<tr>
<input type="hidden" name="id" style="width:100px;" value="<%=user.getId()%>"/>
<td align="right" colspan="2">用户名<input type="text" name="username" style="width:100px;" value="<%=user.getName()%>"/></td><br> </tr>
<tr>
<td align="right" colspan="2">密 码<input type="password" name="pass" style="width:100px;"/></td>
</tr>
<tr> <td align="right"><input type="submit" value="更新"style="width:100px;height:30px;font-size:16px;"/></td> </tr> </table> </form>
</body> </html>
<%@page import="dao.UserImp"%>
<%@page import="model.User"%>
<%@ 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>
<%
int id = Integer.parseInt(request.getParameter("id"));
String name=request.getParameter("name");
String password=request.getParameter("pass");
UserImp userImp=new UserImp();
User user=new User();
user = userImp.load(id);
//user.setName(name);
user.setPassword(password); userImp.update(user);
response.sendRedirect("list.jsp");
%>
</head>
<body> </body>
</html>
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