Java字符串与文件的互转

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; 
        }