public int getThreadSize(long contentLength) {  

        System.out.println("哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈"+   contentLength);
        int threadSize = 1;  //线程数
        BigDecimal contentBig = new BigDecimal(contentLength);  
        BigDecimal bufferBig = new BigDecimal(bufferSize);  
        BigDecimal CyclesBig = new BigDecimal(threadNumOfCycles); //threadNumOfCycles 线程循环次数 
    
        threadSize = contentBig.divide(bufferBig.multiply(CyclesBig), 0,      //multiply 乘以  divide 分；BigDecimal 大小数  
                BigDecimal.ROUND_HALF_UP).intValue();  
        System.out.println("呵呵呵"+  threadSize);
        return threadSize;  
    }