文档介绍：.*;.*;.*;.*;.*;.*;.*;.*;.*;.*;lassJava{publicstaticvoidmain(Stringargs[]){Oneone=newOne();}}classOneextendsJFrameimplementsActionListener{JLabeljlabel1,jlabel2;JButtonjbutton1,jbutton2;JTextFieldjtextfield1;JPaneljpanel1;JPasswordFieldpasswordText;One(){jpanel1=newJPanel();jlabel1=newJLabel("用户名:");jlabel2=newJLabel("密码:");jbutton1=newJButton("登录");jbutton2=newJButton("取消");Fontf=newFont("楷体_GB2312",,32);(f);(f);jtextfield1=newJTextField(10);passwordText=newJPasswordField(10);('*');(this);(this);setLayout(newFlowLayout());(jbutton1);(jbutton2);add(jlabel1);add(jtextfield1);add(jlabel2);add(passwordText);add(jpanel1);setBounds(100,100,500,500);setVisible(true);validate();setDefaultCloseOperation();}publicvoidactionPerformed(ActionEvente){if(()==jbutton1){Stringstr1,str2;str1=().trim();str2=(());Connectioncon;Statementsql;ResultSetrs;try{("");}catch(ClassNotFoundExceptionee){(""+ee);}try{con=("jdbc:odbc:feng","fyl","1111");sql=(,);rs=("SELECT*FROM用户");booleanboo=true;while(()){String用户编号=("用户编号");String用户名=("用户名");if(().equals(str1)&&().equals(str2)){(this,"欢迎进入图书管理系统","login",);setVisible(false);FrameMaint=newFrameMain();boo=false;}}if(boo){(this,"用户不存在或者输入错误请重新输入!","提示",);("");("");}();}catch(SQLExceptioneee){(ee