Java io 操作

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package tlistpackage;   import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException;   /**  * @author Administrator  *  */ public class listdemo {     public static void main(String[] args) throws IOException     { //      System.out.println(Runtime.getRuntime().getClass()); //      System.out.println(Math.round(23.55)); //      System.out.println(Math.ceil(26.333)); //      System.out.println((int)(Math.random()*10+1)); //      Date d=new Date(); //      System.out.println(d.toString()); //      //格式化时间 //      System.out.println(DateFormat.getDateInstance().format(d)); //       char[] buffer=new char[1024]; //                            int len=0; //      while((len=rf.read(buffer))!=-1) //      { //          System.out.print(new String(buffer,0,len)); //      } //      WriteFile("txtdemo.txt","dirk.wang"); //      String textString= ReadFile("txtdemo.txt"); //      System.out.print(textString); //      InputWriteFile("txtdemo.txt","dirk.wang,show time"); //      String str= InputReadFile("txtdemo.txt"); //      System.out.print(str);         CopyFile("txtdemo.txt","new.txt");     }             /**      * @param path 路径      * @return      */     @SuppressWarnings("finally")     public static String ReadFile(String path)     {         FileReader fs=null;         String str="";         try {              fs=new FileReader(path);             char[] buffer =new char[1024];             int len=0;                       while((len=fs.read(buffer))!=-1)             {                 str+=new String(buffer,0,len);             }         } catch (FileNotFoundException e) {                 e.printStackTrace();         }catch (IOException e) {             e.printStackTrace();         }         finally {             if(fs!=null)             {                 try {                     fs.close();                 } catch (IOException e2) {                     e2.printStackTrace();                 }             }             return str;         }     }           /**      * @param path  路径      * @param text  写入的内容      */     public static void WriteFile(String path,String text)     {         FileWriter fw =null;         try {             //true 表示追加写入文件             fw=new FileWriter(path,true);             fw.write(text);             //fw.write(text);             fw.flush();         } catch (FileNotFoundException e) {             e.printStackTrace();         }catch (IOException e) {             // TODO: handle exception             e.printStackTrace();         }finally {             if(fw!=null)             {                 try {                     fw.close();                 } catch (IOException e2) {                     // TODO: handle exception                     e2.printStackTrace();                 }             }         }     }                 /**      * 通过二进制流读取文件      * @param path  路径      * @return      */     public static String InputReadFile(String path)     {         File file=new File(path);         StringBuilder str=new StringBuilder();         if(file.isFile())         {             FileInputStream fs=null;             try {                 fs=new FileInputStream(file);                 byte[] buffer=new byte[1024];                 int len=0;                 while((len=fs.read(buffer))!=-1)                 {                     str.append(new String(buffer,0,len));                 }             } catch (IOException e) {                 // TODO: handle exception                 e.printStackTrace();             }finally {                 if(fs!=null)                 {                     try {                         fs.close();                     } catch (IOException e2) {                         // TODO: handle exception                         e2.printStackTrace();                     }                 }             }         }                   return str.toString();     }           /**      * @param path  路径      * @param text  内容      */     public static void InputWriteFile(String path,String text)     {         File file=new File(path);         FileOutputStream fos=null;         if(file.isFile())         {             try {                 fos=new FileOutputStream(file,true);                 fos.write(text.getBytes());                 fos.flush();             } catch (IOException e) {                 // TODO: handle exception                 e.printStackTrace();             }finally {                 if(fos!=null)                 {                     try {                         fos.close();                     } catch (IOException e) {                         // TODO: handle exception                         e.printStackTrace();                     }                 }             }                       }     }           public static void CopyFile(String oldPath,String newPath)     {         FileInputStream fis=null;         FileOutputStream fos=null;         try {             fis=new FileInputStream(oldPath);             fos=new FileOutputStream(newPath);             int len=0;             byte[] buffer =new byte[1024];             while((len=fis.read(buffer))!=-1)             {                 fos.write(buffer,0,len);                 fos.flush();             }         } catch (IOException e) {             // TODO: handle exception             e.printStackTrace();         }finally {             try {                 fis.close();                 fos.close();             } catch (IOException e2) {                 // TODO: handle exception                 e2.printStackTrace();             }         }     } }