java 读取类内容给指定的方法追加内容

 String beanPath = System.getProperty("user.dir") + "/src/main/java/com/test.java";
		 try {
			BufferedReader bufReader = new BufferedReader(
					new InputStreamReader(new FileInputStream(new File(beanPath))));//数据流读取文件
			StringBuffer strBuffer = new StringBuffer();
			for (String temp = null; (temp = bufReader.readLine()) != null; temp = null) {
				strBuffer.append(temp);
				strBuffer.append(System.getProperty("line.separator"));//行与行之间的分割
				if(temp.indexOf("test") != -1){//找到指定的方法
					strBuffer.append("添加内容");//插入内容
					strBuffer.append(System.getProperty("line.separator"));//行与行之间的分割
				}
			}
			bufReader.close();
			PrintWriter printWriter = new PrintWriter(beanPath);//替换后输出的文件位置
			printWriter.write(strBuffer.toString().toCharArray());
			printWriter.flush();
			printWriter.close();

		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}