eclipse链接数据库mysql登陆

链接数据库类

package com;
import java.sql.*;
public class Mydb
{
Connection conn=null;
Statement stmt=null;
ResultSet rs=null;
public Mydb()
{
  try
  {
   Class.forName("com.mysql.jdbc.Driver");//找驱动对象找不到报异常
  }
  catch(Exception e){e.printStackTrace();}
  String url="jdbc:mysql://localhost:3306/mydb?useUnicode=true&characterEncoding=gbk";
  String user="root";
  String password="123456";
  try
  {
    conn=DriverManager.getConnection(url,user,password);
  }
  catch(SQLException e){e.getMessage();}
}
public ResultSet query(String sql)
{
  try
  {
   stmt=conn.createStatement();
   rs=stmt.executeQuery(sql);
  }
  catch(Exception e){e.getMessage();}
  return rs;
}
public void update(String sql)//void可以不往回传参数
{
  try
  {
   stmt=conn.createStatement();
   stmt.executeUpdate(sql);
  }
  catch(Exception e){e.getMessage();}
}
public void Close(){
        if(conn!=null){
             try{
                 conn.close();
              }
            catch(SQLException e){
                 e.printStackTrace();
              }
        }
      }

}

check

package Bean;
import com.Mydb;
import java.sql.*;

public class Check
{
public boolean isLogin(String xh,String mm)
{
  String a=null;
  String b=null;
  try
  {
   ResultSet rs=null;
   Mydb db=new Mydb();
   a=xh;
   b=mm;
   String str="select * from xs where xh='"+a+"' and mm='"+b+"'";
   rs=db.query(str);
   System.out.print(str);
   if(rs.next()){
    rs.getString("xh");
    db.Close();
    return true;}
  }
  catch(Exception e){e.printStackTrace();}
  return false;

  }
}

action

package com;
import Bean.Check;
public class LoginAction
{
private String xh;
private String mm;

public String getXh() {
return xh;
}

public void setXh(String xh) {
this.xh = xh;
}

public String getMm() {
return mm;
}

public void setMm(String mm) {
this.mm = mm;
}

public String execute()
{
  Check c=new Check();
  if(c.isLogin(getXh(), getMm()))
   return "success";//返回struts中
  else
   return "failure";
}

}

jsp页面

<%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%>
<!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=GB18030">
<title>Insert title here</title>
</head>
<body>
<form action="login.action">
用户名：<input type="text" name="xh"><br>
密码：<input type="text" name="mm"><br>
<input type="submit" value="登录">
</form>
</body>
</html>

eclipse链接数据库mysql登陆

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