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標(biāo)題: 關(guān)于《Struts in Action 中文版》一書中的 UserDirectory [打印本頁]

作者: damalai 時間: 2007-06-19 16:21
標(biāo)題: 關(guān)于《Struts in Action 中文版》一書中的 UserDirectory
今天看了《Struts in Action 中文版》一書。本來是打算照例子去做個簡單的Struts程序
但是發(fā)現(xiàn)了UserDirectory這個類，作者沒給出來。不過最終還是給弄出來了
下面就是UserDirectory的代碼，給大家共享一下吧^_^

package com.mystruts.struts;
import java.io.IOException;
//import java.io.InputStream;
import java.io.FileOutputStream;
import java.util.Enumeration;
import java.util.Properties;
public class UserDirectory {
  private static final String UserDirectoryFile = "resources/users.properties";
  private static final String UserDirectoryHeader = "${user}=${password}";
  private static UserDirectory userDirectory = null;
  private static Properties p;
  private UserDirectory() throws Exception {

java.io.InputStream i = null;
p = null;
i = this.getClass().getClassLoader().
getResourceAsStream(UserDirectoryFile);
if (null==i) {
throw new Exception();
}

else {

try {
   p = new Properties();
   p.load(i);
   i.close();
}

catch (java.io.IOException e) {
   p = null;
   System.out.println(e.getMessage());
   throw new Exception();
}

finally {
   i = null;
}

} // end else

  } // end UserDirectory
  public static UserDirectory getInstance() throws
  Exception {

if (null==userDirectory) {

userDirectory = new UserDirectory();

}

return userDirectory;

  }
  public String fixId(String userId) {
return userId.toUpperCase();
  }
  public boolean isValidPassword(String userId, String
password) {

// no null passwords
if (null==password) return false;

// conform userId to uppercase
String _userId = fixId(userId);

// no passwords for non-users
if (!isUserExist(_userId)) return false;

// does password match user's password
return (password.equals(getPassword(_userId)));

  }
  public boolean isUserExist(String userId) {

// no null users
if (null==userId) return false;

// if not null, it's a user
return !(null==p.getProperty(userId));

  }
  public String getPassword(String userId) {
return p.getProperty(userId);
  }
  public Enumeration getUserIds() {
return p.propertyNames();
  }
  public void setUser(String userId, String password)
  throws
  Exception {

// no nulls
if ((null==userId) || (null==password)) {
throw new Exception();
}


try {

// conform userId to uppercase when stored
p.put(fixId(userId), password);
p.store(new FileOutputStream(UserDirectoryFile),
   UserDirectoryHeader);

}

catch (IOException e) {

throw new Exception();

}
  }

} // end UserDirectory

本文來自ChinaUnix博客，如果查看原文請點：http://blog.chinaunix.net/u1/34710/showart_324460.html

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