1、引入依赖

    	
     
      com.google.code.gson
     	
     
      gson
     	
     
      2.8.2
     
    

2、实现

import java.util.Comparator;import java.util.Iterator;import java.util.Map;import java.util.Map.Entry;import java.util.TreeMap;import com.google.gson.Gson;import com.google.gson.JsonArray;import com.google.gson.JsonElement;/**  * 排序工具 * @ClassName: SortUtils  * @Description:  * @author weiyb  */public class SortUtils{	/**	 * 获取有序字符串	 * @param object	 * @return	 * @author weiyb	 */	public static String getSortParamsByObject(Object object) {		Gson g = new Gson();		JsonElement e = g.toJsonTree(object);		sort(e);		return g.toJson(e);	}	private static Comparator
    
      getComparator() {		Comparator
     
       c = new Comparator
      
       () {			public int compare(String o1, String o2) {				return o1.compareTo(o2);			}		};		return c;	}	public static void sort(JsonElement e) {		if (e.isJsonNull()) {			return;		}		if (e.isJsonPrimitive()) {			return;		}		if (e.isJsonArray()) {			JsonArray a = e.getAsJsonArray();			for (Iterator
       
         it = a.iterator(); it.hasNext();) {				sort(it.next());			}			return;		}		if (e.isJsonObject()) {			Map
        
          tm = new TreeMap
         
          (getComparator()); for (Entry
          
            en : e.getAsJsonObject().entrySet()) { tm.put(en.getKey(), en.getValue()); } for (Entry
           
             en : tm.entrySet()) { e.getAsJsonObject().remove(en.getKey()); e.getAsJsonObject().add(en.getKey(), en.getValue()); sort(en.getValue()); } return; } }}
           
          
         
        
       
      
     
    

3、测试

import org.junit.Test;import com.alibaba.fastjson.JSON;/** * @ClassName: SignTest * @Description: * @author weiyb * @date 2018年4月10日 下午8:24:30 */public class SortTest {		@Test	public void sortTest() {		User user=new User("1","张三",12);		String content = SortUtils.getSortParamsByObject(user);		System.out.println(JSON.toJSONString(content));	}}class User{	private String id;	private String name;	private int age;	public User(String id, String name, int age) {		super();		this.id = id;		this.name = name;		this.age = age;	}	public String getId() {		return id;	}	public void setId(String id) {		this.id = id;	}	public String getName() {		return name;	}	public void setName(String name) {		this.name = name;	}	public int getAge() {		return age;	}	public void setAge(int age) {		this.age = age;	}}