Java檔案操作常用函式記錄：

package com.springwoods.utills;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;

public class FileUtils {
	
    public FileUtils(){
        System.out.println("----->");
    }

    public static boolean IsExist(String path){
        boolean Is;
        File file=new File(path);
        Is = file.exists();
        return Is;
    }
    
	/**
	 * @方法名稱 :wrieteFile
	 * @功能描述 :寫檔案操作
	 * @返回值型別 :void
	 * @param path 檔案路徑 ，content 寫的內容
	 */
    public static void wrieteFile(String path, String content){

        if(IsExist(path)) {
            OutputStream out;
            try {
                out = new BufferedOutputStream(new FileOutputStream(path));
                byte[] time = content.getBytes();
                out.write(time);
                out.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();

            }
        }
    }
    
	/**
	 * @方法名稱 :readLineFile
	 * @功能描述 :一行一行讀檔案內容
	 * @返回值型別 :void
	 * @param filename 檔名
	 */
    public static void readLineFile(String filename){
		try {
			FileInputStream in = new FileInputStream(filename);
			InputStreamReader inReader = new InputStreamReader(in, "UTF-8");
			BufferedReader bufReader = new BufferedReader(inReader);
			String line = null;
			int i = 1;
			while((line = bufReader.readLine()) != null){
				System.out.println("第" + i + "行：" + line);
				i++;
			}
			bufReader.close();
			inReader.close();
			in.close();
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("讀取" + filename + "出錯！");
		}
	}
    
	/**
	 * @方法名稱 :writeLineFile
	 * @功能描述 :一行一行寫檔案
	 * @返回值型別 :void
	 * @param filename 檔名，content 寫的內容
	 */
    public static void writeLineFile(String filename, String[] content){

		if(IsExist(filename)) {
			try {
				FileOutputStream out = new FileOutputStream(filename);
				OutputStreamWriter outWriter = new OutputStreamWriter(out, "UTF-8");
				BufferedWriter bufWrite = new BufferedWriter(outWriter);
				for (int i = 0; i < content.length; i++) {
					bufWrite.write(content[i] + "\r\n");
				}
				bufWrite.close();
				outWriter.close();
				out.close();
			} catch (Exception e) {
				e.printStackTrace();
				System.out.println("讀取" + filename + "出錯！");
			}		
		}
	}
    
	/**
	 * @方法名稱 :writeLineFile
	 * @功能描述 :一行一行寫檔案
	 * @返回值型別 :void
	 * @param filename 檔名，content 寫的內容
	 */
    public static void writeLineFile(String filename, String content){
		try {
			FileOutputStream out = new FileOutputStream(filename, true);
			OutputStreamWriter outWriter = new OutputStreamWriter(out, "UTF-8");
			BufferedWriter bufWrite = new BufferedWriter(outWriter);
			bufWrite.write(content + "\r\n");
			bufWrite.close();
			outWriter.close();
			out.close();
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("讀取" + filename + "出錯！");
		}		
	}
}