filemanager.java

the programme is written with java,not my composition by download from the net.

package base.io;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.FileReader;
import java.io.IOException;
import java.util.List;

public class FileManager { 
	public static final String LAST_CHAR="\n";
	//写文件 参数(绝对路径,内容,是否创建,是否追加)
	public static void write(String path, String content,boolean isCreate,boolean isAppend) {
		try {
			//判断路径是否存在
			File file=new File(getShortPath(path));
			if(!file.exists()){
				if(isCreate)
					file.mkdir();
				else
					throw new java.io.FileNotFoundException(path);
			}
			//如果是否存在文件,是否向后追加
			File file1=new File(path);
			if(!file1.exists()&&!isCreate){
				throw new java.io.FileNotFoundException(path);
			}
			if(file1.exists()&&isAppend){
				content=read(path)+content;
			}
			//开始写文件
			FileWriter fw = new FileWriter(path);
			BufferedWriter bw = new BufferedWriter(fw);
			String array[] = content.split(LAST_CHAR);
			for (int i = 0; i < array.length; i++) {
				bw.write(array[i]);
				bw.newLine();
			}
			bw.flush();
			bw.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
//	写文件 参数(绝对路径,内容(集合),是否创建,是否追加)
	public static void write(String path, List list,boolean isCreate,boolean isAppend) {
		StringBuffer buffer=new StringBuffer();
		for(Object obj:list){
			buffer.append(obj+"\n");
		}
		write(path,buffer.toString(),isCreate,isAppend);
	}
//	读日志，根据传进来的时间
	public static String read(String path) throws FileNotFoundException {
		File file=new File(path);
		//判断要读取的文件是否存在
		if(!file.exists()){
			throw new java.io.FileNotFoundException(path);
		}	
		StringBuffer result = new StringBuffer();
		try {
			FileReader fr = new FileReader(path);
			BufferedReader br = new BufferedReader(fr);
			String temp = null;
			do {
				temp = br.readLine();
				if (temp != null){
					result.append(temp+LAST_CHAR);
				}
			} while (temp != null);
			fr.close();
			br.close();
		} catch (IOException ex) {
			ex.printStackTrace();
		}
		return result.toString().replaceAll(LAST_CHAR+LAST_CHAR,LAST_CHAR);
	}
	//获取不带路径的文件名(两种方法)
	public static String getShortName(String path,boolean isMySelf){
		return isMySelf?path.substring(path.lastIndexOf("\\")+1,path.length()): new File(path).getName();
	}
	public static String getExtendName(String path)
    {
       return (path.substring(path.lastIndexOf(".")+1,path.length())).toLowerCase();
    }
	//获取不带文件名的路径
	public static String getShortPath(String path){
		return path.substring(0,path.lastIndexOf("\\")+1);
	}
	public static void main(String args[]){
		try {
			System.out.println("文件夹路径："+getShortPath("C:\\temp\\a.txt"));
			System.out.println("文件名1："+getShortName("C:\\temp\\a.txt",false));
			System.out.println("文件名2："+getShortName("C:\\temp\\a.txt",true));
			System.out.println("扩展名："+getExtendName("C:\\temp\\a.txt"));
			write("C:\\temp\\a.txt", "大家好,我正在学习Java\n请多多指教",true,true);
			System.out.print(read("C:\\temp\\a.txt"));
		} catch (FileNotFoundException e) {
			System.out.println("文件不存在!!!");
		}
	}
}