Gson和fastjson分別為谷歌和阿里巴巴對JSON數據進行處理封裝的jar包

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兩者異同點：

相同點：都是根據JSON數據創建相應的類不同點：1.調用方式區別谷歌：方法都是非靜態的，需要先創建對象，再去調用阿里：方法都是靜態的，直接用類調用，不需要創建對象2.方法區別：谷歌：fromJson（參數1，參數2）阿里：JSON.parseXX（參數1，參數2）具體是parseObject（）還是parseArray（），根據需要定

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要求：解析下面JSON數據

1.String string = “{name:’zhangsan’,age:18}”;

2.String string = “{persons:[{name:’zhangsan’,age:20},{name:’lisi’,age:21},{name:’wangwu’,age:22}]}”;

3.String string = “{no:1,name:’android’,employees:[{name:’zhangsan’,age:20},{name:’lisi’,age:21},{name:’wangwu’,age:22}]}”;

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代碼：

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第一題：

package 谷歌和阿里解析JSON數據;import com.google.gson.Gson;public class Test {public static void main(String[] args) {//Gson解析JSON數據//1.創建對象Person，有屬性：name，age--創建結束String string = "{name:'zhangsan',age:18}";Gson gson=new Gson();Person person=gson.fromJson(string, Person.class);System.out.println(person.getName()+","+person.getAge());} }class Person{private String name;private int age;public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}@Overridepublic String toString() {return "Person [name=" + name + ", age=" + age + "]";}public Person(String name, int age) {super();this.name = name;this.age = age;}public Person() {super();}}

運行結果：

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第2題：

package 谷歌和阿里解析JSON數據;import java.util.ArrayList;import com.google.gson.Gson;public class Test2 {public static void main(String[] args) {//Gson解析時，遇到對象創建對象，這個對象里所有的內容鍵都作為對象的屬性//1.創建第一個對象，有屬性：persons，且為集合//2.persons集合里是對象，設對象為Person//3.Person，它有兩個屬性：name，age//4.相應的類創建完畢后，就可以解析了String string = "{persons:[{name:'zhangsan',age:20},{name:'lisi',age:21},{name:'wangwu',age:22}]}";Gson gson=new Gson();Persons persons=gson.fromJson(string, Persons.class);System.out.println(persons);} }class Persons{private ArrayList<Person1> persons;public ArrayList<Person1> getPersons() {return persons;}public void setPersons(ArrayList<Person1> persons) {this.persons = persons;}@Overridepublic String toString() {return "Persons [persons=" + persons + "]";}public Persons(ArrayList<Person1> persons) {super();this.persons = persons;}public Persons() {super();}}class Person1{private String name;private int age;public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}@Overridepublic String toString() {return "Person [name=" + name + ", age=" + age + "]";}public Person1(String name, int age) {super();this.name = name;this.age = age;}public Person1() {super();} }

運行結果

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第三題：

package 谷歌和阿里解析JSON數據;import java.util.ArrayList;import com.google.gson.Gson;public class Test3 {public static void main(String[] args) {//1.第一個對象有屬性：no，name，employees，且employees為集合//2.employees數組中有對象，設該對象為Person//3.Person有屬性：name，age----創建結束String string = "{no:1,name:'android',employees:[{name:'zhangsan',age:20},{name:'lisi',age:21},{name:'wangwu',age:22}]}";Gson gson=new Gson();Demo demo=gson.fromJson(string, Demo.class);System.out.println(demo);} }class Demo{private int no;private String name;private ArrayList<Person2> employees;public int getNo() {return no;}public void setNo(int no) {this.no = no;}public String getName() {return name;}public void setName(String name) {this.name = name;}public ArrayList<Person2> getEmployees() {return employees;}public void setEmployees(ArrayList<Person2> employees) {this.employees = employees;}@Overridepublic String toString() {return "Demo [no=" + no + ", name=" + name + ", employees=" + employees + "]";}public Demo(int no, String name, ArrayList<Person2> employees) {super();this.no = no;this.name = name;this.employees = employees;}public Demo() {super();}}class Person2{private String name;private int age;public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}@Overridepublic String toString() {return "Person [name=" + name + ", age=" + age + "]";}public Person2(String name, int age) {super();this.name = name;this.age = age;}public Person2() {super();} }

運行結果：

總結

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