Java操作文件输出为字符串以及字符串输出为文件的方法

/**  * 读取文件为字符串  *   * @return  */public static String readString() {  String str = "";  File file = new File("C:/Users/wan7/Desktop/表单/粗集料试验/粗集料冲击值试验（T0322-2000).html");  try {   FileInputStream in = new FileInputStream(file);   // size 为字串的长度 ，这里一次性读完   int size = in.available();   byte[] buffer = new byte[size];   in.read(buffer);   in.close();   str = new String(buffer, "utf-8");  } catch (IOException e) {   return null;  }  return str; }

 /**  * 输出到文件  */ public static void outFile(String s) {  File file = new File("C:/Users/wan7/Desktop/11111111111.html");  try (FileOutputStream fop = new FileOutputStream(file)) {   // if file doesn't exists, then create it   if (!file.exists()) {    file.createNewFile();   }   // get the content in bytes   byte[] contentInBytes = s.getBytes();   fop.write(contentInBytes);   fop.flush();   fop.close();   System.out.println("Done");  } catch (IOException e) {   e.printStackTrace();  } }