List＜Map＜String,String＞＞ 根据某几个属性值去重

现在有一个场景：一个List中存放了多个Map。现在要使用java8的stream流。根据多个属性值进行联合去重。

List数据示例如下：

[
	{
		"address": "北京",
		"sex": "女",
		"name": "小丽",
		"age": "23"
	},
	{
		"address": "北京",
		"sex": "女",
		"name": "小丽",
		"age": "20"
	},
	{
		"address": "广州",
		"sex": "男",
		"name": "小王",
		"age": "2"
	},
	{
		"address": "广州",
		"sex": "男",
		"name": "小王",
		"age": "27"
	},
	{
		"address": "广州",
		"sex": "男",
		"name": "小王",
		"age": "29"
	},
	{
		"address": "北京",
		"sex": "女",
		"name": "小王",
		"age": "29"
	}
]
           

现在要根据address、sex、name三个属性进行去重，stream流似乎没有封装直接对多个属性进行联合去重的方法。

List<Map<String, String>> collect = list.stream().
collect(Collectors.collectingAndThen(Collectors.toCollection(
() -> new TreeSet<>(Comparator.comparing(o -> o.get("name")))),ArrayList::new));
           

但是我们可以用对多个属性进行拼接，然后再去重。

List<Map<String, String>> arrayList = list.stream().
collect(Collectors.collectingAndThen(Collectors.toCollection(
() -> new TreeSet<>(Comparator.comparing(o -> o.get("name") + ":" + o.get("address") + ":" + o.get("sex")))), ArrayList::new));
           

去重之后就得到了

[
{address=北京, sex=女, name=小丽, age=23}, 
{address=北京, sex=女, name=小王, age=29}, 
{address=广州, sex=男, name=小王, age=2}
]