//AdvertPushDTO为业务对象，getWeight()获取权重值
private AdvertPushDTO weightRamdom(List<AdvertPushDTO> list){
int weightSum = 0;
for (AdvertPushDTO dto : list) {
weightSum += dto.getWeight();
}
if (weightSum <= 0) {
System.err.println("错误: weightSum=" + weightSum);
return null;
}
Integer n = new Random().nextInt(weightSum); // n的值为 [0, weightSum)
Integer m = 0;
for (AdvertPushDTO dto : list) {
if (m <= n && n < m + dto.getWeight()) {
return dto; //返回结果
}
m += dto.getWeight();
}
return null;
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