Java追加文件 

  1 import java.io.BufferedWriter;
  2 import java.io.File;
  3 import java.io.FileOutputStream;
  4 import java.io.FileWriter;
  5 import java.io.IOException;
  6 import java.io.OutputStreamWriter;
  7 import java.io.RandomAccessFile;
  8 
  9 /**
 10  *
 11  * @author FJL
 12  * @version 2013-10-1 
 13  */
 14 public class AppendFile {
 15     
 16     public static void method1(String file, String conent) {   
 17         BufferedWriter out = null;   
 18         try {   
 19             out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file, true)));   
 20             out.write(conent);   
 21         } catch (Exception e) {   
 22             e.printStackTrace();   
 23         } finally {   
 24             try {   
 25                 if(out != null){
 26                     out.close();   
 27                 }
 28             } catch (IOException e) {   
 29                 e.printStackTrace();   
 30             }   
 31         }   
 32     }   
 33   
 34     /**  
 35      * 追加文件：使用FileWriter  
 36      *   
 37      * @param fileName  
 38      * @param content  
 39      */  
 40     public static void method2(String fileName, String content) { 
 41         FileWriter writer = null;
 42         try {   
 43             // 打开一个写文件器，构造函数中的第二个参数true表示以追加形式写文件   
 44             writer = new FileWriter(fileName, true);   
 45             writer.write(content);     
 46         } catch (IOException e) {   
 47             e.printStackTrace();   
 48         } finally {   
 49             try {   
 50                 if(writer != null){
 51                     writer.close();   
 52                 }
 53             } catch (IOException e) {   
 54                 e.printStackTrace();   
 55             }   
 56         } 
 57     }   
 58   
 59     /**  
 60      * 追加文件：使用RandomAccessFile  
 61      *   
 62      * @param fileName 文件名  
 63      * @param content 追加的内容  
 64      */  
 65     public static void method3(String fileName, String content) { 
 66         RandomAccessFile randomFile = null;
 67         try {   
 68             // 打开一个随机访问文件流，按读写方式   
 69             randomFile = new RandomAccessFile(fileName, "rw");   
 70             // 文件长度，字节数   
 71             long fileLength = randomFile.length();   
 72             // 将写文件指针移到文件尾。   
 73             randomFile.seek(fileLength);   
 74             randomFile.writeBytes(content);    
 75         } catch (IOException e) {   
 76             e.printStackTrace();   
 77         } finally{
 78             if(randomFile != null){
 79                 try {
 80                     randomFile.close();
 81                 } catch (IOException e) {
 82                     e.printStackTrace();
 83                 }
 84             }
 85         }
 86     }  
 87 
 88     public static void main(String[] args) {
 89         try{
 90             File file = new File("d://text.txt");
 91             if(file.createNewFile()){
 92                 System.out.println("Create file successed");
 93             }
 94             method1("d://text.txt", "123");
 95             method2("d://text.txt", "123");
 96             method3("d://text.txt", "123");
 97         }catch(Exception e){
 98             System.out.println(e);
 99         }
100     }
101 }

 

posted @ 2013-10-01 17:24  ヾ№酷ㄉㄊ  阅读(320)  评论(0)    收藏  举报