JAVA对文件操作的常用方法

JAVA对文件操作的常用方法

// 文件数据的写入 public static void StringBufferWriteFile(Map<string string=""> data,String path) throws IOException { File file = new File(path); if (!file.exists()) file.createNewFile(); FileOutputStream out = new FileOutputStream(file, true); Set<string> keyStr = data.keySet(); Iterator<string> iterator = keyStr.iterator(); String writeDate = ""; while (iterator.hasNext()) { String iStr = iterator.next(); // System.out.println(iStr); String iValue = data.get(iStr); String aa = iStr + ":" + iValue; writeDate += "\n" + aa; } StringBuffer sb = new StringBuffer(); sb.append(writeDate); out.write(sb.toString().getBytes("utf-8")); out.close(); } // 文件数据的写入 覆盖原数据 public static void StringBufferWrite(String value,String path) throws IOException { BufferedWriter out = new BufferedWriter(new FileWriter(path)); out.write(value); out.flush(); out.close(); } // 文件数据的写入 public static void StringBufferWriteFileAppend(String data,String path) throws IOException { File file = new File(path); if (!file.exists()) file.createNewFile(); FileOutputStream out = new FileOutputStream(file, true); StringBuffer sb = new StringBuffer(); sb.append("\n"+data); out.write(sb.toString().getBytes("utf-8")); out.close(); } // 读取文件 public static Vector<Vector<string>> BufferedReader(String path) throws IOException { Vector<Vector<string>> date=new Vector<Vector<string>>(); File file = new File(path); if (!file.exists() || file.isDirectory()) throw new FileNotFoundException(); BufferedReader br = new BufferedReader(new FileReader(file)); String temp = null; temp = br.readLine(); while (temp != null) { if(temp!=""){ String []arr=temp.split(","); Vector<string> ss=new Vector<string>(); for(int i=0;i<arr.length;i++){ ss.add(arr[i]); } date.add(ss); } temp = br.readLine(); } return date; } // 读取文件除了输入的数据外 public static String BufferedReaderOneWithoutOne(String value,String path) throws IOException { File file = new File(path); if (!file.exists() || file.isDirectory()) throw new FileNotFoundException(); BufferedReader br = new BufferedReader(new FileReader(file)); String temp = null; StringBuffer sb = new StringBuffer(); temp = br.readLine(); while (temp != null) { String arr[] = temp.split(","); if (!arr[0].equals(value)) { sb.append(temp + "\n"); } temp = br.readLine(); } return sb.toString(); } // 读取文件 public static Vector<Vector<string>> BufferedReaderOne(String key,String path) throws IOException { Vector<Vector<string>> date=new Vector<Vector<string>>(); File file = new File(path); if (!file.exists() || file.isDirectory()) throw new FileNotFoundException(); BufferedReader br = new BufferedReader(new FileReader(file)); String temp = null; temp = br.readLine(); while (temp != null) { String valueArr[] = temp.split(","); if (valueArr[0].equals(key)) { Vector<string> row=new Vector<string>(); for(String str:valueArr){ row.add(str); } date.add(row); return date; } else { temp = br.readLine(); } } return null; } </string></string></string></string></string></string></string></string></string></string></string></string></string>