public interface Auth {

public void check(String name,String pwd,AuthResult result);

}

class AuthResult{

public String msg;// 结果信息
public boolean success;// 验证结果

public boolean isSuccess(){
return success;
}

public String getMsg(){
return msg;
}

}
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

public class Auth1 implements Auth {

Mapdata = new HashMap(); @Override public void check(String name,String pwd,AuthResult result) { try { // 加载用户名和密码 InputStream in = getClass().getResourceAsStream(Auth1.txt); BufferedReader br = new BufferedReader(new InputStreamReader(in)); String temp = null; while((temp = br.readLine()) != null){ data.put(temp.split(:)[0], temp.split(:)[1]); } if(data.get(name) == null){ result.success = false; result.msg = 用户名错误; return; } if(!pwd.equals(data.get(name))){ result.success = false; result.msg = 密码错误; return; } result.success = true; result.msg = auth success!; } catch (Exception e) { e.printStackTrace(); } } } public class Auth2 implements Auth { Map data = new HashMap(); @Override public void check(String name,String pwd,AuthResult result) { try { // 加载用户名和密码 InputStream in = getClass().getResourceAsStream(Auth2.txt); BufferedReader br = new BufferedReader(new InputStreamReader(in)); String temp = null; int i = 1; String temp1 = null; while((temp = br.readLine()) != null){ if(i % 2 == 0){ data.put(temp1, temp); } else { temp1 = temp; } i++; } if(data.get(name) == null){ result.success = false; result.msg = 用户名错误; return; } if(!pwd.equals(data.get(name))){ result.success = false; result.msg = 密码错误; return; } result.success = true; result.msg = auth success!; } catch (Exception e) { e.printStackTrace(); } } } import java.util.Scanner; public class Test { public static void main(String[] args) { Auth1 a1 = new Auth1(); Auth2 a2 = new Auth2(); Scanner sc = new Scanner(System.in); String name = null; String pwd = null; System.out.println(enter name:); name = sc.nextLine(); System.out.println(enter pwd:); pwd = sc.nextLine(); AuthResult result = new AuthResult(); System.out.println(---Auth1---check); a1.check(name,pwd,result); if(result.isSuccess()){ System.out.println(auth success!); } else { System.out.println(auth fail! because + result.getMsg()); } System.out.println(---Auth2---check); a2.check(name,pwd,result = new AuthResult()); if(result.isSuccess()){ System.out.println(auth success!); } else { System.out.println(auth fail! because + result.getMsg()); } } } 文件与这些类同包下应该就能读到 Auth1.txt name1:pwd1 name2:pwd2 Auth2.txt name3 pwd3 name4 pwd4