写文件

public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		try {
			File file = new File("F:\\1.xml");
			StringBuffer sb = new StringBuffer("222");
			Test.insertAndWrap(sb, "1111", true);
			Test.insertAndWrap(sb, "3", true);
			
			//纯文字使用字符流
			FileWriter fw = new FileWriter(file);
			BufferedWriter bw = new BufferedWriter(fw);
			PrintWriter pw = new PrintWriter(bw);
			pw.println(sb.toString());
			pw.close();
			bw.close();
			fw.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		
	}

	
	public static void insertAndWrap(StringBuffer buf,String str,boolean flag){
		buf.append(str);
		if(flag){
			buf.append("\r\n");
		}
	}
}