object转为有序json

快来打我* 2022-05-10 01:24 207阅读 0赞

[开发十年，就只剩下这套Java开发体系了 >>> ][Java_ _]  ![hot3.png][]

# 1、引入依赖 #

<dependency>
    	<groupId>com.google.code.gson</groupId>
    	<artifactId>gson</artifactId>
    	<version>2.8.2</version>
    </dependency>

# 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<String> getComparator() {
    		Comparator<String> c = new Comparator<String>() {
    			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<JsonElement> it = a.iterator(); it.hasNext();) {
    				sort(it.next());
    			}
    			return;
    		}
    
    		if (e.isJsonObject()) {
    			Map<String, JsonElement> tm = new TreeMap<String, JsonElement>(getComparator());
    			for (Entry<String, JsonElement> en : e.getAsJsonObject().entrySet()) {
    				tm.put(en.getKey(), en.getValue());
    			}
    
    			for (Entry<String, JsonElement> 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;
    	}
    }

[Java_ _]: https://my.oschina.net/u/3779583/blog/1862418
[hot3.png]: /images/20220510/e287b869f0d6418783a6002648c90476.png