本例以Windows, JDK1.7 为基础，来演示对文件内容的追加，采用的类主要是FileWriter(file,true)来完成。
首先通过write()方法来对文件的写入，接着使用writeAppend()方法来对文件内容的追加。
实例代码如下：
FileWriteAppend.java

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package com.devnp.io;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class FileWriteAppend {

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub

		write();
		
		writeAppend();
	}
	
	public static void write() throws IOException{
		File file = new File("D:\\Person-Test\\1.txt");
		
		BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(file));
		
		String str = "Hi, Hello, I'm devnp.com" ;
		
		bufferedWriter.write(str); //写入str
		
		bufferedWriter.close();
	}
	
	public static void writeAppend() throws IOException{
		File file = new File("D:\\Person-Test\\1.txt");
		
		BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(file, true));
		
		String str = "Hi, Hello, I'm devnp.com too" ;
		
		bufferedWriter.write(str); //写入str
		
		bufferedWriter.close();
	}

}

测试结果：
文件生成地址：D:\Person-Test\1.txt
内容：

Hi, Hello, I'm devnp.comHi, Hello, I'm devnp.com too