一、按照map一个列进行分组，返回map
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
/**
* ListMap根据map中的一个列做分类形成分组
* @param list 需要形成树状图的listmap
* @param key 需要做分类的map的key
* @return 树状map
*/
public static Map listMapClassification(List> list, String key) {
//创建一个空的新map
Map newMap = new HashMap<>();
//循环listmap
for (int s = 0; s> mapList = new ArrayList<>();
//取出当前list循环下的Map
Map objectMap = list.get(s);
//取出map中按key分类好类的值列表
//第一次循环因为没有插入过值，所以会为空
Object get = newMap.get((String) objectMap.get(key));
System.out.println("输出4"+ get);
//判断分好类的当前类的名字下的值是否为空
if(get!=null){
//不为空就将泛型转为list
mapList=(List>) get;
}
//将当前循环的下的那个map插入，分好类的list中
mapList.add(objectMap);
//将当前循环插入好的list，重新给分类赋值
newMap.put((String) objectMap.get(key),mapList);
}
return newMap;
}
使用方法
//两个参数第一个要转换的list，第二个要分类的列
EntityUtils.listMapClassification(mapList,"TB_TG_Code")
原始数据
TB_ID TB_TG_Code TB_TG_Name TB_TB_Code TB_TB_Name TB_TB_Comment TB_HospCode TB_HospName
2 01 结防所病种 0102 复治肺结核 00000000 XXX医院
1 01 结防所病种 0101 初治肺结核 00000000 XXX医院
3 01 结防所病种 0103 结核性胸膜炎 00000000 XXX医院
4 01 结防所病种 0104 单耐药肺结核 00000000 XXX医院
5 01 结防所病种 0105 多耐药肺结核 00000000 XXX医院
6 02 分类二 0106 耐多药肺结核 00000000 XXX医院
{
"code": 0,
"msg": null,
"data": {
"01": [
{
"S_ID": "casc",
"TB_TG_Name": "结防所病种",
"TB_TB_Comment": "",
"TB_HospCode": "00000000",
"S_OperLevel": "1",
"TB_ID": "2",
"TB_TG_Code": "01",
"TB_TB_Name": "复治肺结核",
"TB_HospName": "XXX医院",
"S_TB_Right": "编辑",
"S_TB_Code": "0102",
"S_HospCode": "00000000",
"S_TB_Name": "复治肺结核·",
"TB_TB_Code": "0102"
},
{
"TB_ID": "1",
"TB_TG_Code": "01",
"TB_TB_Name": "初治肺结核",
"TB_HospName": "XXX医院",
"TB_TG_Name": "结防所病种",
"TB_TB_Comment": "",
"TB_HospCode": "00000000",
"TB_TB_Code": "0101"
},
{
"TB_ID": "3",
"TB_TG_Code": "01",
"TB_TB_Name": "结核性胸膜炎",
"TB_HospName": "XXX医院",
"TB_TG_Name": "结防所病种",
"TB_HospCode": "00000000",
"TB_TB_Code": "0103"
},
],
"02": [
{
"TB_ID": "6",
"TB_TG_Code": "02",
"TB_TB_Name": "耐多药肺结核",
"TB_HospName": "XXX医院",
"TB_TG_Name": "分类二",
"TB_HospCode": "00000000",
"TB_TB_Code": "0106"
}
]
}
}
二、按照map一个列进行分组，形成自定义树，返回树状结构
/**
* 按照map一个列进行分组，形成自定义树，返回树状结构
* @param list 需要形成树状图的listmap
* @param key 需要做分类的map的key
* @return
*/
public static List> listMapClassificationTree(List> list, String key) {
//创建一个空的新map
List> newList = new ArrayList<>();
//创建一个空的新map
Map newMap = new HashMap<>();
//循环listmap
for (int s = 0; s> mapList = new ArrayList<>();
//取出当前list循环下的Map
Map objectMap = list.get(s);
//取出map中按key分类好类的值列表
//第一次循环因为没有插入过值，所以会为空
Object get = newMap.get((String) objectMap.get(key));
System.out.println("输出4"+ get);
//判断分好类的当前类的名字下的值是否为空
if(get!=null){
//不为空就将泛型转为list
mapList=(List>) get;
}
//将当前循环的下的那个map插入，分好类的list中
mapList.add(objectMap);
//将当前循环插入好的list，重新给分类赋值
newMap.put((String) objectMap.get(key),mapList);
}
//判断map是否为空
//因为如果为空for-each循环将抛出NullPointerException，因此在遍历前你总是应该检查空引用
if(newMap!=null){
Integer i=0;
//循环这个map将这个map插入list
for (Map.Entry entry : newMap.entrySet()) {
//创建临时的map
Map newMapaddList = new HashMap<>();
// System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue());
newMapaddList.put("child",entry.getValue());
newMapaddList.put("id",i);
newMapaddList.put("name",entry.getKey());
//将临时数据插入要返回的list中
newList.add(newMapaddList);
i++;
}
}
return newList;
}
用法和上面的方法一样
结果
{
"code": 0,
"msg": null,
"data": [
{
"name": "分类二",
"id": 0,
"child": [
{
"TB_ID": "6",
"TB_TG_Code": "02",
"TB_TB_Name": "耐多药肺结核",
"TB_HospName": "XXX医院",
"TB_TG_Name": "分类二",
"TB_HospCode": "00000000",
"TB_TB_Code": "0106"
}
]
},
{
"name": "结防所病种",
"id": 1,
"child": [
{
"S_ID": "ASAS",
"TB_TG_Name": "结防所病种",
"TB_TB_Comment": "",
"TB_HospCode": "00000000",
"S_OperLevel": "1",
"TB_ID": "1",
"TB_TG_Code": "01",
"TB_TB_Name": "初治肺结核",
"TB_HospName": "XXX医院",
"S_TB_Right": "编辑",
"S_TB_Code": "0101",
"S_HospCode": "00000000",
"S_TB_Name": "初治肺结核",
"TB_TB_Code": "0101"
},
{
"S_ID": "casc",
"TB_TG_Name": "结防所病种",
"TB_TB_Comment": "",
"TB_HospCode": "00000000",
"S_OperLevel": "1",
"TB_ID": "2",
"TB_TG_Code": "01",
"TB_TB_Name": "复治肺结核",
"TB_HospName": "XXX医院",
"S_TB_Right": "编辑",
"S_TB_Code": "0102",
"S_HospCode": "00000000",
"S_TB_Name": "复治肺结核·",
"TB_TB_Code": "0102"
},
{
"TB_ID": "3",
"TB_TG_Code": "01",
"TB_TB_Name": "结核性胸膜炎",
"TB_HospName": "XXX医院",
"TB_TG_Name": "结防所病种",
"TB_HospCode": "00000000",
"TB_TB_Code": "0103"
},
{
"TB_ID": "4",
"TB_TG_Code": "01",
"TB_TB_Name": "单耐药肺结核",
"TB_HospName": "XXX医院",
"TB_TG_Name": "结防所病种",
"TB_HospCode": "00000000",
"TB_TB_Code": "0104"
},
{
"TB_ID": "5",
"TB_TG_Code": "01",
"TB_TB_Name": "多耐药肺结核",
"TB_HospName": "XXX医院",
"TB_TG_Name": "结防所病种",
"TB_HospCode": "00000000",
"TB_TB_Code": "0105"
}
]
}
]
}
