您可以执行以下操作:
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
public class TestJackson {
public static void main(String[] args) {
Person p3 = new Person("X",new ArrayList<Person>());
Person p2 = new Person("Y",new ArrayList<Person>());
Person p1 = new Person("Z",new ArrayList<Person>());
p2.getChildren().add(p3);
p1.getChildren().add(p2);
ObjectMapper mapper = new ObjectMapper();
try {
mapper.writeValue(new File("person.json"),p1);
} catch (JsonGenerationException e) {
e.printStackTrace();
} catch (JsonMappingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
程序将以下内容写入person.json
:
{"name":"Z","children":[{"name":"Y","children":[{"name":"X","children":[]}]}]}
Person.java:
import java.util.List;
public class Person {
private String name;
private List<Person> children;
public Person() {
}
public Person(String name,List<Person> children) {
this.name = name;
this.children = children;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<Person> getChildren() {
return children;
}
public void setChildren(List<Person> children) {
this.children = children;
}
@Override
public String toString() {
return "Person [name=" + name + ",children=" + children + "]";
}
}
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