17、java追加文件内容（写入方式）_JAVA_编程开发_程序员俱乐部

class="java">
package com.tij.io.file;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.Charset;

/**
 * 追加内容到文件中
 * @author GYJ
 * @date 2014-3-22
 */
public class AppendFile {

	/**
	 * 之前写了如何写入文件，单是写入文件是覆盖了之前的内容
	 * <p>这个实例展现如何追加内容到文件中
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {
		//追加的目标文件
		String fileName = "/Users/GYJ/java1.txt";
		//追加的数据
		String appendData = "this string will be append to last row fileName";
		//追加文件
		addpendUsingOutputStream(fileName, appendData);
		appendUsingBufferedWrite(fileName, appendData, 400);
		appendUsingFileWrite(fileName, appendData);
		//读出文件
		File file = new File(fileName);
		FileInputStream fis = new FileInputStream(file);
		InputStreamReader isr = new InputStreamReader(fis, Charset.defaultCharset());
		BufferedReader br = new BufferedReader(isr);
		String line;
		int i = 0;
		while ((line = br.readLine()) != null) {
			i ++;
			System.out.println(i + "read result = " + line);
		}
		br.close();
	}
	
	/**
	 * 使用普通流
	 * @param fileNme	被追加的文件名称
	 * @param data		被追加的数据内容
	 * @throws IOException 
	 */
	private static void addpendUsingOutputStream(String fileName, String data) throws IOException {
		//true: 表示是追加的标志
		FileOutputStream os = new FileOutputStream(new File(fileName), true);
		os.write(data.getBytes(), 0, data.length());
		os.close();
	}
	
	/**
	 * 使用BufferedWrite
	 * @param fileName
	 * @param data
	 * @throws IOException 
	 */
	private static void appendUsingBufferedWrite(String fileName, String data, int noOfLines) throws IOException {
		File file = new File(fileName);
		FileWriter fw = null;
		BufferedWriter bw = null;
		//true:表示是追加的标志
		fw = new FileWriter(file, true);
		bw = new BufferedWriter(fw);
		//开始输出写入文件
		for (int i = 0; i < noOfLines; i++) {
			bw.newLine();
			fw.write(data);
		}
		bw.close();
		fw.close();
	}
	
	/**
	 * 使用fileWrite
	 * @param fileName
	 * @param data
	 * @throws IOException 
	 */
	private static void appendUsingFileWrite(String fileName, String data) throws IOException {
		File file = new File(fileName);
		FileWriter fw = null;
		//true:表示是追加的标志
		fw = new FileWriter(file, true);
		fw.write(data);
		fw.close();
	}

}