Map的存储结构式Key/Value形式,Key 和 Value可以是普通类型,也可以是自己写的JavaBean(上一篇博客),还可以是带有泛型的List(本文).本例中您要重点看如何将Json转回 为带泛型的对象List,并且List中的泛型对象有多种实体.
实体类:
- 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;
- }
- @Override
- public String toString() {
- return "Student [birthDay=" + birthDay + ", id=" + id + ", name="
- + name + "]";
- }
- }
- public class Teacher {
- private int id;
- private String name;
- private String title;
- 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 String getTitle() {
- return title;
- }
- public void setTitle(String title) {
- this.title = title;
- }
- @Override
- public String toString() {
- return "Teacher [id=" + id + ", name=" + name + ", title=" + title
- + "]";
- }
- }
测试类:
- package com.tgb.lk.demo.gson.test4;
- import java.util.ArrayList;
- import java.util.Date;
- import java.util.LinkedHashMap;
- import java.util.List;
- import java.util.Map;
- import com.google.gson.Gson;
- import com.google.gson.reflect.TypeToken;
- public class GsonTest4 {
- public static void main(String[] args) {
- Student student1 = new Student();
- student1.setId(1);
- student1.setName("李坤");
- student1.setBirthDay(new Date());
- Student student2 = new Student();
- student2.setId(2);
- student2.setName("曹贵生");
- student2.setBirthDay(new Date());
- Student student3 = new Student();
- student3.setId(3);
- student3.setName("柳波");
- student3.setBirthDay(new Date());
- List<Student> stulist = new ArrayList<Student>();
- stulist.add(student1);
- stulist.add(student2);
- stulist.add(student3);
- Teacher teacher1 = new Teacher();
- teacher1.setId(1);
- teacher1.setName("米老师");
- teacher1.setTitle("教授");
- Teacher teacher2 = new Teacher();
- teacher2.setId(2);
- teacher2.setName("丁老师");
- teacher2.setTitle("讲师");
- List<Teacher> teacherList = new ArrayList<Teacher>();
- teacherList.add(teacher1);
- teacherList.add(teacher2);
- Map<String, Object> map = new LinkedHashMap<String, Object>();
- map.put("students", stulist);
- map.put("teachers", teacherList);
- Gson gson = new Gson();
- String s = gson.toJson(map);
- System.out.println(s);
- System.out.println("----------------------------------");
- Map<String, Object> retMap = gson.fromJson(s,
- new TypeToken<Map<String, List<Object>>>() {
- }.getType());
- for (String key : retMap.keySet()) {
- System.out.println("key:" + key + " values:" + retMap.get(key));
- if (key.equals("students")) {
- List<Student> stuList = (List<Student>) retMap.get(key);
- System.out.println(stuList);
- } else if (key.equals("teachers")) {
- List<Teacher> tchrList = (List<Teacher>) retMap.get(key);
- System.out.println(tchrList);
- }
- }
- }
- }
输出结果:
- {"students": [{"id":1,"name":"李坤","birthDay":"Jun 22, 2012 9:48:19 PM"}, {"id":2,"name":"曹贵生","birthDay":"Jun 22, 2012 9:48:19 PM"}, {"id":3,"name":"柳波","birthDay":"Jun 22, 2012 9:48:19 PM"}],"teachers": [{"id":1,"name":"米老师","title":"教授"},{"id":2,"name":"丁老师","title":"讲 师"}]}
- ----------------------------------
- key:students values: [{id=1.0, name=李坤, birthDay=Jun 22, 2012 9:48:19 PM}, {id=2.0, name=曹贵 生, birthDay=Jun 22, 2012 9:48:19 PM}, {id=3.0, name=柳 波, birthDay=Jun 22, 2012 9:48:19 PM}]
- [{id=1.0, name= 李坤, birthDay=Jun 22, 2012 9:48:19 PM}, {id=2.0, name=曹贵 生, birthDay=Jun 22, 2012 9:48:19 PM}, {id=3.0, name=柳 波, birthDay=Jun 22, 2012 9:48:19 PM}]
- key:teachers values:[{id=1.0, name=米老师, title=教授}, {id=2.0, name=丁老师, title=讲师}]
- [{id=1.0, name=米老师, title=教授}, {id=2.0, name=丁老师, title=讲师}]
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