java追加写入文件内容

public static void addContent(String file,String content) {
		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(file);
			fw = new FileWriter(f, true);
		} catch (IOException e) {
			e.printStackTrace();
		}
		PrintWriter pw = new PrintWriter(fw);
		pw.println(content);
		pw.flush();
		try {
			fw.flush();
			pw.close();
			fw.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public static void addContent2(String file, String conent) {
		BufferedWriter out = null;
		try {
			out = new BufferedWriter(new OutputStreamWriter(
					new FileOutputStream(file, true)));
			out.write(conent + "rn");
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				out.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

    @ResponseBody
    @RequestMapping(value = "/crashLog",method = RequestMethod.POST)
    public Result crashLog(HttpServletRequest request, HttpServletResponse response) throws IOException {

        JSONObject params =  JSONObject.parseObject(RequestUtils.getBody(request));

//        FileUtil.addContent("E:\app.2021-11-04.log",params.toJSonString());
        FileUtil.addContent2("E:\app.2021-11-04.log",params.toJSONString());
        return Result.ok(params);
    }