java中把多个map转为list

浅浅的花香味﹌ 2022-06-02 12:06 251阅读 0赞

package com.yanshu.utils;  
  
  
import java.util.ArrayList;  
import java.util.HashMap;  
import java.util.List;  
import java.util.Map;  
import java.util.Set;  
  
  
import org.jboss.jandex.Main;  
  
  
import com.alibaba.fastjson.JSON;  
  
  
public class MapUtil \{  
  
  
public static String ListTojson(List<HashMap> map2)\{  
if(map2.size()==0)\{  
return "\{\}";  
\}  
System.out.println("maputil 1====="+map2.toString());  
Map<String,List> map=new HashMap<String,List>();  
Set<String> set=map2.get(0).keySet();  
for (String setchild : set) \{  
map.put(setchild, new ArrayList<>());  
\}  
  
  
for (int i = 0; i < map2.size(); i++) \{  
for (String str : set) \{  
map.get(str).add(map2.get(i).get(str)==null?0:map2.get(i).get(str));  
\}  
\}  
return   JSON.toJSONString(map);  
\}  
public static String ListTojsonByStr(List<HashMap> map2,String str)\{  
System.out.println("maputil 2====="+map2.toString());  
String \[\] strs= str.split(",");  
if(map2.size()==0)\{  
return "\{\}";  
\}  
Map<String,List> map=new HashMap<String,List>();  
for (int i = 0; i < strs.length; i++) \{  
map.put(strs\[i\], new ArrayList<>());  
\}  
  
for (int i = 0; i < map2.size(); i++) \{  
for (int j = 0; j < strs.length; j++) \{  
map.get(strs\[j\]).add(map2.get(i).get(strs\[j\])==null?0:map2.get(i).get(strs\[j\]));  
\}  
\}  
System.out.println("map----->>>"+map);  
return   JSON.toJSONString(map);  
\}  
  
public static String ListTrunMapStr(List<HashMap> map2,String string)  
\{  
String\[\] split = string.split(",");  
System.out.println("map2--->>>"+map2);  
System.out.println("string--->>>"+split.length);  
if(map2.size()==0)  
\{  
return "\{\}";  
\}  
Map<String, List> map=new HashMap<>();  
for(int i=0;i<split.length;i++)  
\{  
  
ArrayList<Object> arrayList = new ArrayList<>();  
map.put(split\[i\], arrayList);  
\}  
for(int i=0;i<map2.size();i++)  
\{  
for(int j=0;j<split.length;j++)  
\{  
  
List list = map.get(split\[j\]);  
list.add(map2.get(i).get(split\[j\])==null?0:map2.get(i).get(split\[j\]));  
  
\}  
\}  
System.out.println("map--->>>"+map);  
  
  
  
return JSON.toJSONString(map);  
  
\}  
public static void main(String\[\] args) \{  
String string="无线访客数,商品收藏数";  
Map map=new HashMap<>();  
map.put("无线访客数",23);  
map.put("商品收藏数",24);  
Map map1=new HashMap<>();  
map1.put("无线访客数",123);  
map1.put("商品收藏数",124);  
List list=new ArrayList<>();  
list.add(map);  
list.add(map1);  
System.out.println(list);  
ListTrunMapStr(list,string);  
  
\}  
  
\}