Java讀寫文件Demo

Java按行讀取文件和寫文件Demo

package com.basic;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;

/**
 * 文件讀寫有以下幾種常用的方法</br>
 * 1、字節讀寫（InputStream/OutputStream）</br>
 * int tmp = inputstream.read() != -1</br>
 * 2、字符讀取（FileReader/FileWriter）</br>
 * int tmp = filereader.read() != -1 //換行需要特殊處理</br>
 * 3、行讀取（BufferedReader/BufferedWriter）</br>
 * String tmp = bufferedreader.readLine()</br>
 *
 * @author chichudxing
 * @date 2015年7月28日 下午2:21:19
 */

public class FileReadWriteDemo {

	/**
	 * 從文件fileNme中讀取數據
	 *
	 * @param fileNme
	 *            文件名
	 * @return 讀取的結果
	 */
	public static String Read(String fileNme) {
		StringBuilder sb = new StringBuilder(4096);
		BufferedReader in = null;
		try {
			in = new BufferedReader(new InputStreamReader(new FileInputStream(fileNme), "UTF-8"));
			String linetmp = null;

			while ((linetmp = in.readLine()) != null) {
				sb.append(linetmp + "\n");
			}

		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (null != in) {
				try {
					in.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return sb.toString();
	}

	/**
	 * 將數據寫入文件.
	 *
	 * @param fileName
	 *            文件名
	 * @param data
	 *            要寫的數據.
	 */
	public static void Write(String fileName, String data) {
		PrintWriter out = null;
		boolean append = false;
		try {
			out = new PrintWriter(new OutputStreamWriter(new FileOutputStream(fileName, append), "UTF-8"));
			out.println(data);
			out.flush();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			out.close();
		}
	}

	public static void main(String[] args) {

		String readData = Read("conf/重生之妖孽人生.txt");

		Write("./io/BufferedReaderDemoWrite.java", readData);

	}
}