Java追加写入文件方法

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方法一：

public void method1() {FileWriter fw = null;try {//如果文件存在，则追加内容；如果文件不存在，则创建文件File f=new File("E:\\dd.txt");fw = new FileWriter(f, true);} catch (IOException e) {e.printStackTrace();}PrintWriter pw = new PrintWriter(fw);pw.println("追加内容");pw.flush();try {fw.flush();pw.close();fw.close();} catch (IOException e) {e.printStackTrace();}}

方法二：（建议）

public static void method2(String file, String conent) {BufferedWriter out = null;try {out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file, true)));out.write(conent+"\r\n");} catch (Exception e) {e.printStackTrace();} finally {try {out.close();} catch (IOException e) {e.printStackTrace();}}}

方法三：

public static void method3(String fileName, String content) {try {// 打开一个随机访问文件流，按读写方式RandomAccessFile randomFile = new RandomAccessFile(fileName, "rw");// 文件长度，字节数long fileLength = randomFile.length();// 将写文件指针移到文件尾。randomFile.seek(fileLength);randomFile.writeBytes(content+"\r\n");randomFile.close();} catch (IOException e) {e.printStackTrace();}}}

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