Jackson学习一之对象与JSON互相转化
package com.jingshou.pojo;import java.util.Date;public class Student {private int id;private String name;private Date birthDay;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Date getBirthDay() {return birthDay;}public void setBirthDay(Date birthDay) {this.birthDay = birthDay;}@Overridepublic String toString() {return "Student [birthDay=" + birthDay + ", id=" + id + ", name="+ name + "]";}}

package com.jingshou.pojo;import java.util.List;public class Class {private String cname;private List<Student> members;public String getCname() {return cname;}public void setCname(String cname) {this.cname = cname;}public List<Student> getMembers() {return members;}public void setMembers(List<Student> members) {this.members = members;}public String toString(){return "The Class Name is: " + cname + " " + "The members are: " + members;}}

package com.jingshou.jackson;import java.io.IOException;import java.util.ArrayList;import java.util.Date;import java.util.List;import com.fasterxml.jackson.databind.ObjectMapper;import com.jingshou.pojo.Class;import com.jingshou.pojo.Student;public class JacksonTest1 {public static void main(String[] args) throws IOException {Student student1 = new Student(); student1.setId(5237);student1.setName("jingshou");student1.setBirthDay(new Date()); ObjectMapper mapper = new ObjectMapper(); // Convert object to JSON string String Json = mapper.writeValueAsString(student1); System.out.println("Change Object to JSON String: " + Json); // Convert Json string to Object Student student2 = mapper.readValue(Json, Student.class); System.out.println(student2); // Create a student list add it to Bj Student student3 = new Student(); student3.setId(5117); student3.setName("saiya"); student3.setBirthDay(new Date()); List<Student> stuList = new ArrayList<Student>(); stuList.add(student1); stuList.add(student3); Class bj = new Class(); bj.setCname("五年二班"); bj.setMembers(stuList); String json2 = mapper.writeValueAsString(bj); System.out.println("The JSON from Class is: " + json2); Class bj2 = mapper.readValue(json2, Class.class); System.out.println(bj2); }}

Change Object to JSON String: {"id":5237,"name":"jingshou","birthDay":1389513906622}Student [birthDay=Sun Jan 12 16:05:06 CST 2014, id=5237, name=jingshou]The JSON from Class is: {"cname":"五年二班","members":[{"id":5237,"name":"jingshou","birthDay":1389513906622},{"id":5117,"name":"saiya","birthDay":1389513906859}]}The Class Name is: 五年二班 The members are: [Student [birthDay=Sun Jan 12 16:05:06 CST 2014, id=5237, name=jingshou], Student [birthDay=Sun Jan 12 16:05:06 CST 2014, id=5117, name=saiya]]

?

小结: