Java:JSON解析利器JackSon

Java:JSON解析利器JackSon

JackSon基础

1.Maven项目引入

<!-- https://mvnrepository.com/artifact/org.codehaus.jackson/jackson-core-asl -->
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
<version>1.9.13</version>
</dependency>

2.使用方式

public class ReadWriteJackson {
public static void main(String[] args) throws IOException {
ObjectMapper mapper = new ObjectMapper();

String jsonInput = "{\"id\":0,\"firstName\":\"Robin\",\"lastName\":\"Wilson\"}";
Person q = mapper.readValue(jsonInput, Person.class);
System.out.println("Read and parsed Person from JSON: " + q);

Person p = new Person("Roger", "Rabbit");
System.out.print("Person object " + p + " as JSON = ");
mapper.writeValue(System.out, p);
}
}

3.使用注解忽略未知字段

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

@JsonIgnoreProperties(ignoreUnknown = true)
public class Stuff {
private String stuff_name;
private Integer stuff_number;
private Double stuff_price;
private String stuff_bid_id;
. . . . . .
}