JavaWeb實現登入註冊與驗證碼。

阿新 • • 發佈：2018-12-04

寫JavaWeb的準備工作：
首先準備好資料庫和Myeclipse，這裡以mysql為例，再下載好SQL的圖形化操作介面SQLyog,在資料庫中建張表這裡寫圖片描述。
詳細步驟：
在Myeclipse 中新建一個Web工程：

在src下建三個包ServletPackge,ModelPackage,TestPackage.
分別存放即將要建立的Servlet，和通過java連線資料庫對資料庫進行基本操作的java程式和測試程式。
導jar包：
將mysql-connector-java-5.0.3-bin .jar包匯入到 WEN-INF下的lib資料夾，右擊build path將包新增到Referenced Libraries下呈奶瓶狀。這裡寫圖片描述

在ModelPackage中寫入：

程式碼：add.java主要是向是資料庫中新增資料
package Mod;

import java.sql.DriverManager;
import java.sql.SQLException;




public class add {
    public static void main(String[] args) {

        final String driver ="com.mysql.jdbc.Driver";
        final String url ="jdbc:mysql://localhost:3306/students" 
;


            try {
                Class.forName(driver);
            } catch (ClassNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            try {
                java.sql.Connection conn = DriverManager.getConnection(url,"root" 
,"1234");
                String sql ="insert into student(name) value=(?)";
                java.sql.PreparedStatement pst =conn.prepareStatement(sql);
                pst.setString(1, "benben");
                System.out.println("完成");

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

    }

}
DBOperator.java主要是對資料庫的連線操作：
package Mod;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBOperator {
    private static final String driver ="com.mysql.jdbc.Driver";
    private static final String url ="jdbc:mysql://localhost:3306/students";
    static{
        try {
            Class.forName(driver);
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static Connection getConnection() {
        Connection conn =null;
        try {
            conn =(Connection) DriverManager.getConnection(url,"root","1234");
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return conn;

    }
    public static void close(ResultSet rs, Statement st, Connection conn)
    {
        try
        {
            if(rs != null)
            {
                rs.close();
            }
            if(st != null)
            {
                st.close();
            }
            if(conn != null)
            {
                conn.close();
            }

        }catch(Exception ex)
        {
            ex.printStackTrace();
        }

    }

    public static void close(Statement st, Connection conn)
    {
        close(null,st,conn);
    }
}
 student.java儲存學生的id，name,tel資訊與資料庫中相對應：
 package Mod;

public class student {

    private  int id;
    private String name;
    private int tel;
    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 int getTel() {
        return tel;
    }
    public void setTel(int tel) {
        this.tel = tel;
    }

}
StudentManger.java這是一個介面 寫入兩個方法分別對應登入時使用的checkLogin和註冊時用的add方法。
public interface StudentManger {
    public boolean add(student S);

    public boolean checkLogin(int tel, String name);
}
StudentMangerImpl 是上面介面的實現方法：
package Mod;


import java.sql.SQLException;


//import com.mysql.jdbc.ResultSet;

public class StudentMangerImpl implements StudentManger  {


    public boolean add(student S) {
        boolean flag = false;

        java.sql.Connection conn = null;
        java.sql.PreparedStatement pst = null;
        conn =  DBOperator.getConnection();
        String sql = "insert into student(name,tel) value(?,?) ";
        try {
            pst = conn.prepareStatement(sql);
            pst.setString(1, S.getName());
            pst.setInt(2, S.getTel());
            int rows=pst.executeUpdate();
            if(rows>0){
                flag=true;
            }

        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return flag;
    }

    @Override
    public boolean checkLogin(int tel, String name) {
        boolean flag=false;

        //student S = new student();

        java.sql.Connection conn = null;
        java.sql.Statement st =null;
        java.sql.ResultSet rs = null;



        try {
            conn=DBOperator.getConnection();
            String sql = "select * from student where tel="+tel;
            st=conn.createStatement();
            rs = st.executeQuery(sql);


            while(rs.next()){
                if(rs.getString("name").equals(name));

                    flag =true;

            }




        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally {
            DBOperator.close(rs, st, conn);

        }



        return flag;
    }

}

在TestPackage中寫：

ConnectionTest.java對是否成功連線資料庫進行測試：
import Mod.DBOperator;

public class ConnectionTest {
    public static void main(String[] args) {
        java.sql.Connection conn = DBOperator.getConnection();
        if (conn != null) {
            System.out.println("連線成功！");
        }

    }

}
在testStudent:
package Test;

import java.sql.DriverManager;
import java.sql.SQLException;

import Mod.DBOperator;
import Mod.StudentMangerImpl;
import Mod.student;



public class testStudent {
    public static void main(String[] args) {
        final String driver ="com.mysql.jdbc.Driver";
        final String url ="jdbc:mysql://localhost:3306/students";

        try {
            Class.forName(driver);
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        DBOperator d= new DBOperator();
        try {
            java.sql.Connection conn = DriverManager.getConnection(url,"root","1234");
            if(conn!=null){
                System.out.println("連結成功");
            }
            else{
                System.out.println("連結失敗");
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


        StudentMangerImpl N = new StudentMangerImpl();
        student B =new student();
        B.setId(6);
        B.setName("yang");
        B.setTel(5);

        if(N.add(B)){
            System.out.println("新增成功");
        }
        else{
            System.out.println("新增失敗");
        }
        StudentMangerImpl S = new StudentMangerImpl() ;
        if(S.checkLogin(5, "yang")){
            System.out.println("成功");
        }
        else{
            System.out.println("失敗");
        }
    }

}

JSP的建立：
在WebRoot下建立index.jsp,load.jsp,zhuce.jsp分別是一個跳轉，一個登入介面和註冊成功介面
index.jsp程式碼：
點選跳轉
load.jsp程式碼：
在中新增
function reLoadCode(){
var t =new Date().getTime();
document.getElementById("imagecode").src="ImageServlet?t"+t;
}

在中寫：

<h1>使用者管理系統</h1>
    <form action="denglu" method="post">
      學&nbsp;號：<input name="id" type="text"><br/>
    <p></p>
    姓&nbsp;名： <input name="name" type="text"><br/>
      <p></p>
    電&nbsp;話：  <input name="tel" type="text"><br/>  
    <p></p>
     驗證碼:<input name="checkcode" type="text">
     <p></p> 
 <img alt="驗證碼" src="ImageServlet" id = "imagecode">
 <a href="javaScript:reLoadCode()">看不清</a><br/>

  <input type="submit" value="登入">&nbsp;&nbsp;&nbsp;&nbsp;<a href ="Main.jsp">新使用者</a>
    </form>
    </center>

在註冊頁面寫：

<form action="zhuce" method="post">
    學&nbsp;號：<input name="id" type="text"><br/>
    <p></p>
    姓&nbsp;名： <input name="name" type="text"><br/>
      <p></p>
    電&nbsp;話：  <input name="tel" type="text"><br/>  <p></p>
  <input type="submit" value="註冊">
    </form>
    </center>

其中action=”??”要與建立的servlet的URL地址相匹配：
這裡寫圖片描述

每一個action 的值都要匹配一個一個servlet。
寫Servlet:
load.java：

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import Mod.StudentManger;
import Mod.StudentMangerImpl;



public class denglu extends HttpServlet {

    /**
     * Constructor of the object.
     */
    public denglu() {
        super();
    }

    /**
     * Destruction of the servlet. <br>
     */
    public void destroy() {
        super.destroy(); // Just puts "destroy" string in log
        // Put your code here
    }

    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request,response);

    }

    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {


        request.setCharacterEncoding("GB18030");
        response.setCharacterEncoding("GB18030");

        int tel = Integer.parseInt(request.getParameter("tel"));
        String name = request.getParameter("name");
        String checkcode = request.getParameter("checkcode");
        String piccode = (String) request.getSession().getAttribute("piccode");


        Mod.student S = new Mod.student();
        StudentManger M = new StudentMangerImpl();
         boolean flag ;
        flag=M.checkLogin(tel, name);

        if(flag==true&&checkcode.equalsIgnoreCase(piccode)){
            response.sendRedirect("index.jsp");

        }
        else{
            response.setContentType("textml");
            PrintWriter out = response.getWriter();
            out.print("失敗！");
        }
    }


    /**
     * Initialization of the servlet. <br>
     *
     * @throws ServletException if an error occurs
     */
    public void init() throws ServletException {
        // Put your code here
    }

zhuce.java

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import Mod.StudentManger;
import Mod.StudentMangerImpl;
import Mod.student;


public class zhuce extends HttpServlet {

    /**
     * Constructor of the object.
     */
    public zhuce() {
        super();
    }

    /**
     * Destruction of the servlet. <br>
     */
    public void destroy() {
        super.destroy(); // Just puts "destroy" string in log
        // Put your code here
    }

    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request,response);

    }

    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {




        request.setCharacterEncoding("GB18030");
        response.setCharacterEncoding("GB18030");

        StudentManger S = new StudentMangerImpl();
        student M = new student();

        int id = Integer.parseInt(request.getParameter("id"));
        String name = request.getParameter("name");
        int tel =Integer.parseInt(request.getParameter("tel"));


        M.setId(id);
        M.setName(name);
        M.setTel(tel);
        boolean flag = S.add(M);
        if(flag ==true){
            response.sendRedirect("load.jsp");
        }
        else{
            response.setContentType("textml");
            PrintWriter out = response.getWriter();
            out.print("失敗！");
        }
    }

    /**
     * Initialization of the servlet. <br>
     *
     * @throws ServletException if an error occurs
     */
    public void init() throws ServletException {
        // Put your code here
    }

}

ImageServlet.java

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import Mod.StudentManger;
import Mod.StudentMangerImpl;
import Mod.student;


public class zhuce extends HttpServlet {

    /**
     * Constructor of the object.
     */
    public zhuce() {
        super();
    }

    /**
     * Destruction of the servlet. <br>
     */
    public void destroy() {
        super.destroy(); // Just puts "destroy" string in log
        // Put your code here
    }

    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request,response);

    }

    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {




        request.setCharacterEncoding("GB18030");
        response.setCharacterEncoding("GB18030");

        StudentManger S = new StudentMangerImpl();
        student M = new student();

        int id = Integer.parseInt(request.getParameter("id"));
        String name = request.getParameter("name");
        int tel =Integer.parseInt(request.getParameter("tel"));


        M.setId(id);
        M.setName(name);
        M.setTel(tel);
        boolean flag = S.add(M);
        if(flag ==true){
            response.sendRedirect("load.jsp");
        }
        else{
            response.setContentType("textml");
            PrintWriter out = response.getWriter();
            out.print("失敗！");
        }
    }

    /**
     * Initialization of the servlet. <br>
     *
     * @throws ServletException if an error occurs
     */
    public void init() throws ServletException {
        // Put your code here
    }

}

工作已經全部完成。

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