java注冊用戶-九游会j9娱乐平台

a. java語言實現用戶注冊和登錄

//這個是我寫的，裡面有連接資料庫的部分。你可以拿去參考一下
import java.awt.*;
import javax.swing.*;

import java.awt.event.*;
import java.sql.*;

class loginfrm extends jframe implements actionlistener// throws exception
{
jlabel lbl1 = new jlabel("用戶名:");
jlabel lbl2 = new jlabel("密碼:");
jtextfield txt = new jtextfield(5);
jpasswordfield pf = new jpasswordfield();
jbutton btn1 = new jbutton("確定");
jbutton btn2 = new jbutton("取消");

public loginfrm() {
this.settitle("登陸");
jpanel jp = (jpanel) this.getcontentpane();
jp.setlayout(new gridlayout(3, 2, 5, 5));
jp.add(lbl1);
jp.add(txt);
jp.add(lbl2);
jp.add(pf);
jp.add(btn1);
jp.add(btn2);
btn1.addactionlistener(this);
btn2.addactionlistener(this);
}

public void actionperformed(actionevent ae) {
if (ae.getsource() == btn1) {
try {
class.forname("com.mysql.jdbc.driver");// mysql資料庫
connection con = drivermanager.getconnection(
"jdbc:mysql://localhost/car_zl", "root", "1");// 資料庫名為car_zl，密碼為1
system.out.println("com : " con);
statement cmd = con.createstatement();
string sql = "select * from user where user_id='"
txt.gettext() "' and user_ps='"
pf.gettext() "'" ;
resultset rs = cmd
.executequery(sql);// 表名為user，user_id和user_ps是存放用戶名和密碼的欄位名

if (rs.next()) {
joptionpane.showmessagedialog(null, "登陸成功！");
} else
joptionpane.showmessagedialog(null, "用戶名或密碼錯誤！");
} catch (exception ex) {

}

if (ae.getsource() == btn2) {
system.out.println("1111111111111");
//txt.settext("");
//pf.settext("");
system.exit(0);
}
}
}

public static void main(string arg[]) {
jframe.(true);
loginfrm frm = new loginfrm();
frm.setsize(400, 200);
frm.setvisible(true);
}
}

b. 用java編程實現用戶注冊並進行登錄操作

string username = "",password = "",passwordagain = ""; // 定義用戶名和密碼

將該變數等於為全局變數 或局部變數即可

c. 一個java的問題 用類和對象做 實現會員注冊

偽登錄，
import java.util.scanner;

public class loregister{
/**
* @param args
*/
public static void main(string[] args) {
register l=new register();
string reg=l.to();
system.out.println(reg);
}
public string to(){
scanner input=new scanner(system.in);
system.out.println("請輸入用戶名");
string name=input.next();
system.out.println("請輸入密碼");
string pass=input.next();
system.out.println("請確認密碼");
string repass=input.next();
if(name.length()<3){
return "賬號長度不能小於3位";
}
if(pass.length()<8){
return "密碼長度不能小於8位";
}
if(!pass.equals(repass)){
return "兩次密碼不同";
}
else {
return "注冊成功，賬號是" name "密碼" pass;

}
}
}