JSON忽略字段

得不到的永遠在騷動-json如何忽略字段！

前言：在工作中經常會使用到JSON格式的數據，在我們將對象轉化為JSON時，有時不需要全部的字段;那我們該怎麼處理呢？

下面給大家介紹幾種常見的忽略對象屬性的方法！

好了廢話不多BB，直接開碼！

transient關鍵字

使用方法：可以在不需要的字段前面加上transient修飾

<code>public class JosnIgnoreTest {
    public static void main(String[] args) {
        Person person = new Person();
        person.setName("zerocode");
        person.setAge(18);
        person.setPwd("123456");
        System.out.println(JSON.toJSONString(person)); //輸出結果{"age":18,"name":"zerocode"}
    }
}
​
class Person{
    private String name;
    private int age;
    private transient String pwd;
    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;
    }
    public String getPwd() {
        return pwd;
    }
    public void setPwd(String pwd) {
        this.pwd = pwd;
    }
    
}
​/<code>

使用阿里巴巴 fastjson工具包

使用方式：

1. @JSONField(serialize=false)註解import com.alibaba.fastjson.JSON;
   import com.alibaba.fastjson.annotation.JSONField;
   ​
   public class JosnIgnoreTest {
   ​
   public static void main(String[] args) {
   Person person = new Person();
   person.setName("zerocode");
   person.setAge(18);
   person.setPwd("123456");
   System.out.println(JSON.toJSONString(person));//輸出結果{"age":18,"name":"zerocode"}
   }
   
   ​
   }
   ​
   class Person{
   private String name;
   private int age;
   @JSONField(serialize=false)
   private String pwd;
   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;
   }
   public String getPwd() {
   return pwd;
   }
   public void setPwd(String pwd) {
   this.pwd = pwd;
   }
   
   }
   ​
2. 使用SimplePropertyPreFilter

<code>import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.annotation.JSONField;
import com.alibaba.fastjson.serializer.SimplePropertyPreFilter;
​
public class JosnIgnoreTest {
​
    public static void main(String[] args) {
        Person person = new Person();
        person.setName("zerocode");
        person.setAge(18);
        person.setPwd("123456");
        
        SimplePropertyPreFilter filter = new SimplePropertyPreFilter();
        filter.getExcludes().add("pwd");
        
        System.out.println(JSONObject.toJSONString(person, filter));//輸出結果{"age":18,"name":"zerocode"}
    }
​
}
​
class Person {
    private String name;
    private int age;
    private String pwd;
​
    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;
    }
​
    public String getPwd() {
        return pwd;
    }
​ 

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }
​
}
​/<code>

使用谷歌gson工具包

使用方式：

1. @Expose 註解(需要的字段添加此註解，忽略的字段不添加)import com.google.gson.Gson;
   import com.google.gson.GsonBuilder;
   import com.google.gson.annotations.Expose;
   ​
   public class JosnIgnoreTest2 {
   ​
   public static void main(String[] args) {
   Person person = new Person();
   person.setName("zerocode");
   person.setAge(18);
   person.setPwd("123456");
   ​
   Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();
   System.out.println(gson.toJson(person));
   }
   }
   ​
   class Person {
   @Expose
   private String name;
   @Expose
   private int age;
   private String pwd;
   ​
   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;
   }
   ​
   public String getPwd() {
   return pwd;
   }
   ​
   public void setPwd(String pwd) {
   this.pwd = pwd;
   }
   }
   ​
2. 使用特定修飾符

<code>import java.lang.reflect.Modifier;
​
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
​
public class JosnIgnoreTest {
​
    public static void main(String[] args) {
        Person person = new Person();
        person.setName("zerocode");
        person.setAge(18);
        person.setPwd("123456");
        person.setIdCard("6666");
​
        Gson gson = new GsonBuilder().excludeFieldsWithModifiers(Modifier.PUBLIC).create();//不展示public修飾胡屬性
        System.out.println(gson.toJson(person));//{"name":"zerocode","age":18,"pwd":"123456"}
​
    }
}
​
class Person {
    private String name;
    private int age;
    private String pwd; 

    public String idCard;
​
    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;
    }
​
    public String getPwd() {
        return pwd;
    }
​
    public void setPwd(String pwd) {
        this.pwd = pwd;
    }
​
    public String getIdCard() {
        return idCard;
    }
​
    public void setIdCard(String idCard) {
        this.idCard = idCard;
    }
    
}
​/<code>

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關鍵字: 修飾 忽略 關鍵字