java字符串文件互相转换
Java字符串与文件的互转 Java中有时候需要读取一个文本类的文件,将其转换为字符串，然后做进一步处理。Java中没有现成的API方法，自己手动实现一个，大家来分享。 一、字符串转换为文件 /** * 将字符串写入指定文件(当指定的父路径中文件夹不存在时，会最大限度去创建，以保证保存成功！) * * @param res 原字符串 * @param filePath 文件路径 * @return 成功标记 */ public static boolean string2File(String res, String filePath) { boolean flag = true; BufferedReader bufferedReader = null; BufferedWriter bufferedWriter = null; try { File distFile = new File(filePath); if (!distFile.getParentFile().exists()) distFile.getParentFile().mkdirs(); bufferedReader = new BufferedReader(new StringReader(res)); bufferedWriter = new BufferedWriter(new FileWriter(distFile)); char buf[] = new char[1024]; //字符缓冲区 int len; while ((len = bufferedReader.read(buf)) != -1) { bufferedWriter.write(buf, 0, len); } bufferedWriter.flush(); bufferedReader.close(); bufferedWriter.close(); } catch (IOException e) { e.printStackTrace(); flag = false; return flag; } finally { if (bufferedReader != null) { try { bufferedReader.close(); } catch (IOException e) { e.printStackTrace(); } } } return flag; } 二、文件转换为字符串 /** * 文本文件转换为指定编码的字符串 * * @param file 文本文件 * @param encoding 编码类型 * @return 转换后的字符串 * @throws IOException */ public static String file2String(File file, String encoding) { InputStreamReader reader = null; StringWriter writer = new StringWriter(); try { if (encoding == null || "".equals(encoding.trim())) { reader = new InputStreamReader(new FileInputStream(file), encoding); } else { reader = new InputStreamReader(new FileInputStream(file)); } //将输入流写入输出流 char[] buffer = new char[DEFAULT_BUFFER_SIZE]; int n = 0; while (-1 != (n = reader.read(buffer))) { writer.write(buffer, 0, n); } } catch (Exception e) { e.printStackTrace(); return null; } finally { if (reader != null) try { reader.close(); } catch (IOException e) { e.printStackTrace(); } } //返回转换结果 if (writer != null) return writer.toString(); else return null; }