如何忽略Java中JSON对象的多个属性?
@JsonIgnoreProperties 杰克逊注解可以用于指定属性的列表 或者字段 的一类忽略。 @JsonIgnoreProperties注释 可以放在上面的类声明,而不是上面的各个属性或字段忽略。
语法
@Target(value={ANNOTATION_TYPE,TYPE,METHOD,CONSTRUCTOR,FIELD})@Retention(value=RUNTIME)
public @interface JsonIgnoreProperties
示例
import java.io.*;import com.fasterxml.jackson.annotation.*;
import com.fasterxml.jackson.databind.*;
public class JsonIgnorePropertiesTest {
public static void main(String[] args) throws IOException {
Customer customer = new Customer("120", "Ravi", "Hyderabad");
System.out.println(customer);
ObjectMapper mapper = new ObjectMapper();
String jsonString = mapper.writeValueAsString(customer);
System.out.println("JSON: " + jsonString);
System.out.println("---------");
jsonString = "{\"id\":\"130\",\"name\":\"Rahul\", \"address\":\"Mumbai\"}";
System.out.println("JSON: " + jsonString);
customer = mapper.readValue(jsonString, Customer.class);
System.out.println(customer);
}
}
//客户分类
@JsonIgnoreProperties({"id", "address"}) class Customer {
private String id;
private String name;
private String address;
public Customer() {
}
public Customer(String id, String name, String address) {
this.id = id;
this.name = name;
this.address = address;
}
public String getId() {
return id;
}
public String getName() {
return name;
}
public String getAddress() {
return address;
} @Override
public String toString() {
return "Customer [id=" + id + ", name=" + name + ", address=" + address + "]";
}
}
输出结果
Customer [id=120, name=Ravi, address=Hyderabad]JSON: {"name":"Ravi"}
---------
JSON: {"id":"130","name":"Rahul", "address":"Mumbai"}
Customer [id=null, name=Rahul, address=null]
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