一个简单的servlet注册试验的一些问题（写不到数据库,望高手指点)

程序实现目标:写到数据库即可
目录结构:

UserBean.java

package com.study.bean;

public class UserBean {

     private String username;
     private String password;
     public String getUsername() {
         return username;
    }
     public void setUsername(String username) {
         this .username = username;
    }
     public String getPassword() {
         return password;
    }
     public void setPassword(String password) {
         this .password = password;
    }



}

UserDao.java

package com.study.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;

import com.study.bean. * ;
import com.study.db.DBHelper;

public class UserDao {
     /**
     *
     * 增加用户
     *
      */

     public void setUser(UserBean tuser)
    {
        String sql = " INSERT INTO T_USER VALUES(null,?,?) " ; // USER_NAME=?,USER_PWD=?;
        PreparedStatement pstat = null ;
        Connection conn = new DBHelper().getConn();
         try {
            pstat = conn.prepareStatement(sql);

            pstat.setString( 1 , tuser.getUsername());
            pstat.setString( 2 , tuser.getPassword());


        } catch (SQLException e) {
             // TODO Auto-generated catch block

        } finally {
             try {
                 if (conn != null )
                    conn.close();
                 if (pstat != null )
                    pstat.close();
            } catch (SQLException e) {
                 // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

    }
}

DBHelper.java

package com.study.db;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
/**
*
* 数据库连接类
*
*/
public class DBHelper {
     private String driver = " org.gjt.mm.mysql.Driver " ;
     private String url = " jdbc:mysql://localhost:3306/first " ;
     private String user = " root " ;
     private String pwd = " 0433gygy " ;

     public Connection getConn(){
        Connection conn = null ;
         try {
            Class.forName(driver);
            conn = DriverManager.getConnection(url, user, pwd);
        } catch (ClassNotFoundException e) {
             // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SQLException e) {
             // TODO Auto-generated catch block
            e.printStackTrace();
        }
         return conn;
    }
     public static void main(String[] args) {
        System.out.println( " DBHelper.main() " + new DBHelper().getConn());
    }
}

package com.study.servlet;

import javax.servlet.http. * ;
import javax.servlet. * ;

import java.io. * ;

import com.study.bean. * ;
import com.study.dao. * ;

public class Register extends HttpServlet{
     public void doGet(HttpServletRequest request,HttpServletResponse response)
     throws ServletException,IOException
    {
        String un = request.getParameter( " username " );
        String pd = request.getParameter( " password " );


        UserBean Tuser = new UserBean();
        Tuser.setPassword(pd);
        Tuser.setUsername(un);
//         PrintWriter out = response.getWriter();
//         out.println("<html>");
//         out.println("<marquee>"+Tuser.getUsername()+"</marquee>");
//         out.println("</html>");
        UserDao dao = new UserDao();
        dao.setUser(Tuser);

    }

      public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException
   {
       doGet(request, response);

   }
}

web.xml

< servlet >
     < servlet-name > first </ servlet-name >
     < servlet-class > com.study.servlet.Register </ servlet-class >
   </ servlet >
   < servlet-mapping >
     < servlet-name > first </ servlet-name >
     < url-pattern > /first </ url-pattern >

   </ servlet-mapping >

reg.jsp

< body >
     < form action ="first" method = "post" >
    username: < input type ="text" name ="username" >
    password: < input type ="password" name ="password" >
     < input type ="submit" >
     </ form >
   </ body >

在reg.jsp 自己随便提交个表单.
程序很简单,没什么东西,结果就是写不到数据库,整个程序运行没有报错!望高手指点一下哪边有问题了.

一个简单的servlet注册试验的一些问题（写不到数据库,望高手指点)

你可能感兴趣的:(一个简单的servlet注册试验的一些问题（写不到数据库,望高手指点))