userandpsw.java

基于java的文件管理系统 能实现包括文件的创建、删除、查找等功能

package fileSys.util;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.Reader;
import java.io.Writer;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * 登陆文件信息类 
 */
public class UserAndPsw {
	
	/**
	 * 获得所有用户登陆信息	
	 * @return 用户登陆信息
	 * @throws Exception
	 */
	public Map<String,String> getUserMap()throws Exception{
		
		Map<String,String> userMap = new HashMap<String,String>();
		Reader reader = new FileReader("/main/.userpsw.txt");
		BufferedReader  bufferReader = new BufferedReader(reader);
		
		String[] values;
		String username;
		String psw;
		String keyvalue;
		
		while((keyvalue = bufferReader.readLine())!=null){
			
			values = keyvalue.split("=");
			username = values[0].trim();
			psw = values[1].trim();
			userMap.put(username, psw);
		}
		
		bufferReader.close();
		reader.close();
		return userMap;
	}
	
	/**
	 * 保存用户登陆信息
	 * @param valueMap 所有用户的登陆信息
	 * @throws Exception
	 */
	public void setUserMap(Map<String,String> valueMap) throws Exception{
		
		Writer writer = new FileWriter("/main/.userpsw.txt");
		BufferedWriter bufferWriter = new BufferedWriter(writer);
		
		String keyvalues = "";
		
		String password;
		
		List<String> values = new ArrayList<String>();
		Set<String> usernameSet = valueMap.keySet();
		
		for(String username : usernameSet ){
			
			password = valueMap.get(username);
			values.add(username+ " = "+password);
			
		}
		
		for(String keyvalue : values){
			
			keyvalues = keyvalues + keyvalue;
			bufferWriter.write(keyvalues);
			bufferWriter.newLine();
			keyvalues = "";
		}
		
		bufferWriter.close();
		writer.close();
	}
	
}