Question

java判断输入的18位数（最后一位可能是x）的身份证是否合法

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Answer 1

package com.uttest;
import com.util.*;
import javax.swing.*;
import java.awt.event.*;
public class IDTestCase extends JFrame{
JTextField txtIDNumber;
JButton btnCheck;
public IDTestCase(){
super("检查身份证号");
setBounds(0,0,400,60);
setResizable(false);
setLayout(new java.awt.FlowLayout());
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
txtIDNumber=new JTextField(18);
add(txtIDNumber);
btnCheck=new JButton("检查");
btnCheck.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
JOptionPane.showMessageDialog(null,IDNumberChecker.isLegal(txtIDNumber.getText())?"合法":"非法","检查结果",JOptionPane.INFORMATION_MESSAGE);
}
});
add(btnCheck);
setVisible(true);
}
public static void main(String[] args){
new IDTestCase();
}
}
//IDNumberCheck.java
package com.util;
public class IDNumberChecker{
public static boolean isLegal(String IDNumber){
boolean result=IDNumber.matches("[0-9]{15}|[0-9]{17}[0-9X]");
if(result){
int year,month,date;
if(IDNumber.length()==15){
year=Integer.parseInt(IDNumber.substring(6,8));
month=Integer.parseInt(IDNumber.substring(8,10));
date=Integer.parseInt(IDNumber.substring(10,12));
}
else{
year=Integer.parseInt(IDNumber.substring(6,10));
month=Integer.parseInt(IDNumber.substring(10,12));
date=Integer.parseInt(IDNumber.substring(12,14));
}
switch(month){
case 2:result=(date>=1)&&(year%4==0?date<=29:date<=28);break;
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:result=(date>=1)&&(date<=31);break;
case 4:
case 6:
case 9:
case 11:result=(date>=1)&&(date<=31);break;
default:result=false;break;
}
}
return result;
}
}