JAVA标识合并_Java相同id的数据集合，合并数据为一条，并将几个字段内容合并为一个...

/**

* Created by shaozhiqi on 2019/7/31.*/public class TestUnion {

@Test

public void test1() {

List> dbList = new ArrayList<>();

Map map1= new HashMap<>();

map1.put("id", "1");

map1.put("assort_no", "11111");

map1.put("name", "test");

map1.put("leve1", "high");

map1.put("leve1Desc", "高风险");

dbList.add(map1);

Map map2= new HashMap<>();

map2.put("id", "2");

map2.put("assort_no", "11111");

map2.put("name", "test");

map2.put("leve1", "low");

map2.put("leve1Desc", "低风险1");

dbList.add(map2);

Map map3= new HashMap<>();

map3.put("id", "3");

map3.put("assort_no", "11222");

map3.put("name", "test2");

map3.put("leve1", "low");

map3.put("leve1Desc", "低风险2");

dbList.add(map3);

Map map4= new HashMap<>();

map4.put("id", "4");

map4.put("assort_no", "11111");

map4.put("name", "test");

map4.put("leve1", "low");

map4.put("leve1Desc", "低风险3");

dbList.add(map4);

Map map5= new HashMap<>();

map5.put("id", "5");

map5.put("assort_no", "11111");

map5.put("name", "test");

map5.put("leve1", "high");

map5.put("leve1Desc", "高风险5");

dbList.add(map5);for (Mapm : dbList) {

List high= new ArrayList();

List low= new ArrayList();for (Mapmm : dbList) {if (mm.get("assort_no").toString().equals(m.get("assort_no").toString())) {if ("high".equals(mm.get("leve1").toString())) {

high.add(mm.get("leve1Desc").toString());

}else if ("low".equals(mm.get("leve1").toString())) {

low.add(mm.get("leve1Desc").toString());

}

}

}

m.put("high", high);

m.put("low", low);

}

dbList.forEach(m->{

System.out.println(GSON.toJson(m));

});

Map mapResult=new HashMap<>();for (Mapm : dbList) {

mapResult.put(m.get("assort_no").toString(),m);

}

System.out.println("========================去重后==========================");

mapResult.forEach((k,v)->{

System.out.println(GSON.toJson(v));

});

}

}