创建一个类地址。
public class Address { private String street; private String city; private int zip; public String getStreet() { return street; } public void setStreet(String street) { this.street = street; } public String getCity() { return city; } public void setCity(String city) { this.city = city; } public int getZip() { return zip; } public void setZip(int zip) { this.zip = zip; }}创建一个类别ID。
public class Id { private String fname; private String lname; private Address addr; public String getFname() { return fname; } public void setFname(String fname) { this.fname = fname; } public String getLname() { return lname; } public void setLname(String lname) { this.lname = lname; } public Address getAddr() { return addr; } public void setAddr(Address addr) { this.addr = addr; }}主要方法：
import com.fasterxml.jackson.core.JsonProcessingException;import com.fasterxml.jackson.databind.ObjectMapper;public class Test { public static void main(String[] args) { Address addressObj = new Address(); addressObj.setCity("Chicago"); addressObj.setStreet("Some Street"); addressObj.setZip(12345); Id idObj = new Id(); idObj.setAddr(addressObj); idObj.setFname("Test"); idObj.setLname("Tester"); ObjectMapper mapper = new ObjectMapper(); //Object to JSON in String try { String jsonInString = mapper.writerWithDefaultPrettyPrinter().writevalueAsString(idObj); System.out.println(jsonInString); } catch (JsonProcessingException e) { // TODO Auto-generated catch block e.printStackTrace(); }}}输出：
{ "fname" : "Test", "lname" : "Tester", "addr" : { "street" : "Some Street", "city" : "Chicago", "zip" : 12345 }}
