BLE_WIFI_Scale_Server_Api/utils/WeightUnitUtils.java

package com.inet.ailink.receiver.common.utils;

import java.io.IOException;
import java.math.BigDecimal;

public class WeightUnitUtils {
	
	public static void main(String arg[]) throws IOException{
//		System.out.println("100kg="+getKg(100,0,0)+"kg");//100kg
//		System.out.println("10kg="+getKg(100,0,1)+"kg");//10kg
//		System.out.println("1kg="+getKg(100,0,2)+"kg");//1kg
//		System.out.println("100.1kg="+getKg(1001,0,1)+"kg");//1kg
//		System.out.println("100.5kg="+getKg(1005,0,1)+"kg");//1kg
//		System.out.println("100.6kg="+getKg(1006,0,1)+"kg");//1kg
//		System.out.println("100.8kg="+getKg(1008,0,1)+"kg");//1kg
//		System.out.println("100.11kg="+getKg(10011,0,2)+"kg");//1kg
//		System.out.println("100.55kg="+getKg(10055,0,2)+"kg");//1kg
//		System.out.println("100.66kg="+getKg(10066,0,2)+"kg");//1kg
//		System.out.println("100.88kg="+getKg(10088,0,2)+"kg");//1kg
		
//		System.out.println("100lb="+getKg(100,6,0)+"kg");//100kg
//		System.out.println("10lb="+getKg(100,6,1)+"kg");//10kg
//		System.out.println("1lb="+getKg(100,6,2)+"kg");//1kg
//		System.out.println("100.1lb="+getKg(1001,6,1)+"kg");//1kg
//		System.out.println("100.5lb="+getKg(1005,6,1)+"kg");//1kg
//		System.out.println("100.6lb="+getKg(1006,6,1)+"kg");//1kg
//		System.out.println("100.8lb="+getKg(1008,6,1)+"kg");//1kg
//		System.out.println("100.11lb="+getKg(10011,6,2)+"kg");//1kg
//		System.out.println("100.55lb="+getKg(10055,6,2)+"kg");//1kg
//		System.out.println("100.66lb="+getKg(10066,6,2)+"kg");//1kg
//		System.out.println("100.88lb="+getKg(10088,6,2)+"kg");//1kg
		
//		System.out.println("100st="+getKg(100,4,0)+"kg");//100kg
//		System.out.println("10st="+getKg(100,4,1)+"kg");//10kg
//		System.out.println("1st="+getKg(100,4,2)+"kg");//1kg
//		System.out.println("100.1st="+getKg(1001,4,1)+"kg");//1kg
//		System.out.println("100.5st="+getKg(1005,4,1)+"kg");//1kg
//		System.out.println("100.6st="+getKg(1006,4,1)+"kg");//1kg
//		System.out.println("100.8st="+getKg(1008,4,1)+"kg");//1kg
//		System.out.println("100.11st="+getKg(10011,4,2)+"kg");//1kg
//		System.out.println("100.55st="+getKg(10055,4,2)+"kg");//1kg
//		System.out.println("100.66st="+getKg(10066,4,2)+"kg");//1kg
//		System.out.println("100.88st="+getKg(10088,4,2)+"kg");//1kg
		
	}
	
	public static BigDecimal getKg(BigDecimal weight, int weightUnit,int weightPoint){
		BigDecimal result = BigDecimal.ZERO;
		//小数位转换
		if(weightPoint == 0){
			result = weight;
		}else{
			result = weight;
			for(int i=0;i<weightPoint;i++){
				result = result.divide(new BigDecimal(10));
			}
		}
		//单位转化为千克
		switch (weightUnit) {
			case 0://千克，不需要转换
				break;
			case 1://斤->千克
				result = result.multiply(new BigDecimal(2));
				break;
			case 4://st->千克
				//st先转成lb，在转成千克
				result = result.multiply(new BigDecimal(14.0f));//st->lb
				result = result.divide(new BigDecimal(2.2046226f),7, BigDecimal.ROUND_HALF_UP);//lb->kg
				break;
			case 6://lb->kg
				result = result.divide(new BigDecimal(2.2046226f),7, BigDecimal.ROUND_HALF_UP);
				break;
			default:
				break;
		}
		//保留2位小数
		result = result.setScale(2, BigDecimal.ROUND_HALF_UP);
		return result;
	}
}