login.java

上传个比较简单的代码 有问题的大家及时交流啊!!(家用管理JAVA版,用SWT开发的)

package myprojects.Login;

import org.eclipse.swt.*;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

import myprojects.DBcon.*;
import myprojects.HomeManage.*;
import myprojects.queryCharge.*;

public class Login
{
	public String strUserID=null;
	public String strUserName=null;
	public String adminFlag="";
	public String delFlag="";
	public String queryFlag="";
	
	private Group group;
	private Text txtUserID;
	private Text txtPassword;
	private Button btnLogin;
	private Button btnExit;
	
	private static DBcon DB=new DBcon();
	private static Shell shell;
	public static void main(String[] args)
	{
		Display display=new Display();
		shell=new Shell(display,SWT.MIN);
		Login objLogin=new Login();
		
		shell.setSize(320,200);
		shell.setVisible(true);
		shell.setText("家庭财务管理系统V1.0(测试版)");
		try
		{
			shell.setImage(new Image(shell.getDisplay(),"image.ico"));
		}
		catch(Exception e)
		{
		}
		shell.open();

        objLogin.creatGroup();
        
		if(!DB.getConnection())
        {
            MessageBox msBox = new MessageBox(shell,SWT.OK|SWT.ICON_ERROR);
            msBox.setText("错误");
            msBox.setMessage("数据库连接出错");
            msBox.open();
            return;
        }
        
        while(!objLogin.shell.isDisposed())
		{
			if(!display.readAndDispatch())
			{
				display.sleep();
			}
		}
		display.dispose();
	}
	private void creatGroup()
	{
		group=new Group(shell,SWT.None);
		group.setBounds(5,5,300,150);
		
		Label lblName=new Label(group,SWT.None);
		lblName.setText("用户 I D");
		lblName.setBounds(50,40,50,15);
		txtUserID=new Text(group,SWT.BORDER);
		txtUserID.setBounds(110,35,130,20);
		
		Label lblPassword=new Label(group,SWT.None);
		lblPassword.setText("用户密码");
		lblPassword.setBounds(50,70,50,15);
		txtPassword=new Text(group,SWT.PASSWORD|SWT.BORDER);
		txtPassword.setBounds(110,65,130,20);
		
		btnLogin=new Button(group,SWT.None);
		btnLogin.setText("登 录");
		btnLogin.setBounds(80,100,70,25);
		
		btnExit=new Button(group,SWT.None);
		btnExit.setText("退 出");
		btnExit.setBounds(160,100,70,25);
		
		txtUserID.setFocus();
		
		txtUserID.addModifyListener(new ModifyListener(){
			public void modifyText(ModifyEvent eve)
			{
				int flagID = checkValidate(txtUserID.getText());
				if(flagID==0)
				{
					showMessage("错误!","用户ID中不能有单或双引号!",SWT.ICON_INFORMATION);
					txtUserID.setText("");
				}
				return;
			}
		});
		txtUserID.addKeyListener(new KeyAdapter(){
			public void keyPressed(KeyEvent userid)
			{
				if(userid.keyCode==SWT.CR)
				{
					if(txtUserID.getText().length()==0)
					{
						showMessage("错误!","用户ID号不能为空!",SWT.ICON_INFORMATION);
					}
					else
					{
						txtPassword.setFocus();
					}
				}
			}
		});
		txtPassword.addModifyListener(new ModifyListener(){
			public void modifyText(ModifyEvent eve)
			{
				int flagPass = checkValidate(txtPassword.getText());
				if(flagPass==0)
				{
					showMessage("错误!","密码中不能有单或双引号!",SWT.ICON_INFORMATION);
					txtPassword.setText("");
				}
				return;
			}
		});
		txtPassword.addKeyListener(new KeyAdapter(){
			public void keyPressed(KeyEvent password)
			{
				if(password.keyCode==SWT.CR)
				{
					if(txtPassword.getText().length()==0)
					{
						showMessage("错误!","用户密码不能为空!",SWT.ICON_INFORMATION);
					}
					else
					{
						btnLogin.setFocus();
					}
				}
			}
		});
		btnLogin.addSelectionListener(new SelectionAdapter(){
			public void widgetSelected(SelectionEvent log)
			{
				if(txtUserID.getText().length()==0)
				{
					showMessage("错误!","用户ID号不能为空!",SWT.ICON_INFORMATION);
					txtUserID.setFocus();
				}
				else if(txtPassword.getText().length()==0)
				{
					showMessage("错误!","用户密码不能为空!",SWT.ICON_INFORMATION);
					txtPassword.setFocus();
				}
				else
				{
					checkUser();
				}
			}
		});
		btnExit.addSelectionListener(new SelectionAdapter(){
			public void widgetSelected(SelectionEvent exit)
			{
				int flag=showMessage("敬告!","你真的要退出此系统吗?(Y/N)",SWT.OK|SWT.CANCEL|SWT.ICON_INFORMATION);
				if(flag==32)
				{
					shell.dispose();
				}
			}
		});
	}
	private void checkUser()
	{
		int flagLogin=0;
		flagLogin=DB.checkUser(txtUserID.getText(),txtPassword.getText());
		if(flagLogin==1)
		{
			try
			{
				strUserName=DB.rstSelect.getString("userName");
				adminFlag=DB.rstSelect.getString("adminFlag");
				delFlag=DB.rstSelect.getString("delFlag");
				queryFlag=DB.rstSelect.getString("queryFlag");
				System.out.println(strUserName);
			}
			catch(Exception e)
			{	
				System.out.println("用户个人信息加载失败!");
			}
			String[] toManage=null;
			shell.getDisplay().dispose();
			shell.dispose();
			HomeManage.main(toManage);			
		}
		else
		{
			showMessage("错误!","用户名或密码错误,请重新输入!",SWT.ICON_INFORMATION);
			txtUserID.setFocus();
		}
	}
	private int checkValidate(String Check)
	{
		String strCheck=Check;
		String string=null;
		int flag=1;
		int len=strCheck.length();
		for(int i=0;i<=len-1;i++)
		{
			string=strCheck.substring(i,i+1);
			if(string.equals("\'")|string.equals("\""))
			{
				flag=0;
			}
			string=null;
		}
		return flag;
	}
	/**
	* 函数名：showMessage
	* 编写者：郭军
	* 功  能：加载数据及应用相关设置
	* 输入参数：标题,信息,报警类型
	* 输出参数：返回值
	* 备  注：
	*/
	private int showMessage(String title,String message,int flag)
	{
		int retFlag;							//定义一个返回值的接收变量
		MessageBox msgbox=new MessageBox(shell,flag);
		msgbox.setText(title);					//设置消息的桂标题
		msgbox.setMessage(message);				//设置消息的内容
		retFlag=msgbox.open();
		return retFlag;
	}

}