java讀大文件最快性能【轉】

java讀大文件最快性能

完全引用自: 幾種讀大文件方法的效率對比測試

 據說1.88g只要5秒左右,未親測.

/** 
     * 讀大文件 
     * BufferedReader + char[] 
     * @throws IOException 
     */  
    public static void readFile1() throws IOException{  
          
        long start = System.currentTimeMillis();  
        BufferedReader br = new BufferedReader(new FileReader(filePathName));  
          
        char[] buff = new char[1024];  
        int len = -1;  
        while( (len = br.read(buff)) != -1 ){  
            //System.out.print(new String(buff, 0, len));  
        }  
        long end = System.currentTimeMillis();  
        System.out.println("讀大文件   BufferedReader + char[], 耗時="+(end-start));    
    }