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)

yxc — Thu, 02 Apr 2009 12:16:00 GMT

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("");
//        out.println(""+Tuser.getUsername()+"");
//        out.println("");
        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>firstservlet-name>
    <servlet-class>com.study.servlet.Registerservlet-class>
  servlet>
  <servlet-mapping>
    <servlet-name>firstservlet-name>
    <url-pattern>/firsturl-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.

yxc 2009-04-02 20:16 发表评论

关于html标签 textarea

yxc — Mon, 30 Jun 2008 17:38:00 GMT

第一次用，玩一下！

<body>
    <textarea rows="6" cols="30">

<%
    int t=1;
    for(int i=0;i<4;i++)
    {
       for(int j=0;j<=i;j++)
          out.print(t);
       out.println();

    }
%>

    textarea>

  body>

输出：
1
11
111
1111

yxc 2008-07-01 01:38 发表评论

BlogJava-yxc's java home-随笔分类-Jsp & Servlet

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)

关于html标签 textarea