java读大文件最快性能

Posted 2020-10-12 万物生长

java读大文件最快性能

完全引用自: 几种读大文件方法的效率对比测试

 据说1.88g只要5秒左右,未亲测.

/** 
     * 读大文件 
     * 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("读大文件   BufferedReader + char[], 耗时="+(end-start));    
    }