有这样一个实体类:
package com.hy; public class Emp { private int id; private int age; private String name; private boolean isMale; private String phone; public Emp() { } public Emp(int id,int age,String name,boolean isMale,String phone) { this.id=id; this.age=age; this.name=name; this.isMale=isMale; this.phone=phone; } public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone; } public int getId() { return id; } public void setId(int id) { this.id = id; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } public boolean isMale() { return isMale; } public void setMale(boolean isMale) { this.isMale = isMale; } }
如果有这样一个实例:
Emp felix=new Emp(6,47,"费力克死",false,"18000000001");
那用这个实例得到json文是:
{"age":47,"id":6,"male":false,"name":"费力克死","phone":"18000000001"}
这个结果没有以key排序且是横向扩展的,如果属性众多可读性就不是那么理想。
因此,下面这个类就登场了:
package com.hy; import java.util.ArrayList; import java.util.Collections; import java.util.List; import java.util.regex.Matcher; import java.util.regex.Pattern; import net.sf.json.JSONObject; /** * 简单Json排序类 * @author 逆火 * * 2019年11月24日 上午11:57:39 */ public class SimpleJsonSorter { private List<KeyValue> kvList; public SimpleJsonSorter(String jsonStr){ kvList=new ArrayList<KeyValue>(); java.util.regex.Pattern pattern=Pattern.compile("("([_a-zA-Z]+[_a-zA-Z0-9]*)")[:]([^,}]+)"); Matcher matcher=pattern.matcher(jsonStr); while(matcher.find()) { //System.out.println( matcher.group(1)+ ":"+matcher.group(3)); kvList.add(new KeyValue(matcher.group(1),matcher.group(3))); } } public String getFormattedJson() { Collections.sort(kvList); StringBuilder sb=new StringBuilder(); sb.append("{ "); for(KeyValue kv:kvList) { sb.append(" "+kv.key+":"+kv.value+", "); } sb.append("}"); return sb.toString(); } protected final class KeyValue implements Comparable<KeyValue>{ private String key; private String value; public KeyValue(String key,String value) { this.key=key; this.value=value; } public int compareTo(KeyValue other) { return this.key.compareTo(other.key); } } public static void main(String[] args) { Emp felix=new Emp(6,47,"费力克死",false,"18000000001"); JSONObject deptJson = JSONObject.fromObject(felix); String jsonString=deptJson.toString(); System.out.println(jsonString); SimpleJsonSorter sjs=new SimpleJsonSorter(jsonString); System.out.println(sjs.getFormattedJson()); } }
经过它整形后,json文会是:
{ "age":47, "id":6, "male":false, "name":"费力克死", "phone":"18000000001", }
这样,它内部key以字母序排列,方便查找,又是竖向扩展的,用于写文档省力多了。
--END-- 2019年11月24日12:27:34