java读大文件最快性能【转】

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[];
        int len = -;
        while( (len = br.read(buff)) != - ){
            //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));
    }