map转json字符串字段排序

Posted 2021-06-16 xiejunna

需求：map转成json字符串，要求字段按字母升序排列

package com.data.test;

import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.SerializerFeature;

public class Test {
	
	public static void main(String[] args) {
		//Map<String,String> amap = new TreeMap<>();
		Map<String,String> amap = new HashMap<>();
		amap.put("d", "d1");
		amap.put("c", "c1");
		amap.put("a", "a1");
		amap.put("b", "b1");
		System.out.println(amap);
		//String astr = JSONObject.toJSONString(amap, SerializerFeature.SortField);
		String astr = JSONObject.toJSONString(amap, SerializerFeature.MapSortField);
		System.out.println(astr);
	}
}