文件读写工具类TextFile.java

//使用此工具类可以快速的实现读取文件内容到string,并封装到ArrayList中；进行一系列的操作之后，可以再讲内容写入到文件中。
//使用此工具可以避免JavaIO中一些繁琐的装饰操作，简化了编程

package net.mindview.util;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;

public class TextFile extends ArrayList<String>{
	//read a file as a single string
	public static String read(String fileName){
		StringBuilder sb = new StringBuilder();
		try{
			BufferedReader in = new BufferedReader(	new FileReader(
							new File(fileName).getAbsoluteFile()));
			try{
				String s;
				while((s=in.readLine()) != null){
					sb.append(s);
					sb.append("\n");
				}
			}finally{
				in.close();
			}
		}catch(IOException e){
			throw new RuntimeException(e);
		}
		return sb.toString();
	}
	
	//write a single file in one method call
	public static void write (String fileName, String text){
		try{
			PrintWriter out = new PrintWriter(
					new File(fileName).getAbsoluteFile());
			try{
				out.print(text);
			}finally{
				out.close();
			}
		}catch(IOException e){
			throw new RuntimeException(e);
		}
	}
	
	//Read a file, split by any regular expression
	public TextFile(String fileName, String splitter){
		super(Arrays.asList(read(fileName).split(splitter)));
		//regular expression split() often leaves an empty
		//stirng at the first plsition
		if(get(0).equals("")) remove(0);
	}
	
	//一般按行来读取
	public TextFile(String fileName){
		this(fileName,"\n");
	}
	public void write(String fileName){
		try{
			PrintWriter out = new PrintWriter(
					new File(fileName).getAbsoluteFile());
			try{
				for(String item: this)
					out.println(item);
			}finally{
				out.close();
			}
		}catch(IOException e){
			throw new RuntimeException(e);
		}
	}
	
	//测试
	public static void main(String[] args) {
		String file = read("e:\\data\\data3.txt");
		System.out.println(file);
		write("e:\\data\\data5.txt",file);
		
		TextFile text = new TextFile("e:\\data\\data3.txt");
		System.out.println(text);
		text.write("e:\\data\\data6.txt");
	}

}