fastJson在java后台转换json格式数据探究（二）--处理数组/List/Map

直接给代码：

 package fastJson.test;

 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;

 import com.alibaba.fastjson.JSON;
 import com.alibaba.fastjson.JSONArray;

 public class FastJsonTest1
 {

     /**
      * 数组转json格式字符串
      */
     public void array2Json(){
         String[] arr = {"bill","green","maks","jim"};
         String jsonText = JSON.toJSONString(arr, true);
         System.out.println("array2Json()方法：jsonText=="+jsonText);
         // 输出结果：jsonText==["bill","green","maks","jim"]
     }

     /**
      * json格式字符串转数组
      */
     public void json2Array(){
         String jsonText = "[\"bill\",\"green\",\"maks\",\"jim\"]";
         JSONArray jsonArr = JSON.parseArray(jsonText);
         System.out.println("json2Array()方法：jsonArr=="+jsonArr);
         // 输出结果：jsonArr==["bill","green","maks","jim"]
     }

     /**
      * 数组转json格式字符串
      */
     public void array2Json2(){
         User user1 = new User("P001","TOM",16);
         User user2 = new User("P002","JACKSON",21);
         User user3 = new User("P003","MARTIN",20);
         User[] userArr = {user1,user2,user3};
         String jsonText = JSON.toJSONString(userArr, true);
         System.out.println("array2Json2()方法：jsonText=="+jsonText);
         //输出结果：jsonText==[{"age":16,"id":"P001","name":"TOM"},{"age":21,"id":"P002","name":"JACKSON"},{"age":20,"id":"P003","name":"MARTIN"}]
     }

     /**
      * json格式字符串转数组
      */
     public void json2Array2(){
         String jsonText = "[{\"age\":16,\"id\":\"P001\",\"name\":\"TOM\"},{\"age\":21,\"id\":\"P002\",\"name\":\"JACKSON\"},{\"age\":20,\"id\":\"P003\",\"name\":\"MARTIN\"}]";
         JSONArray jsonArr = JSON.parseArray(jsonText);
         System.out.println("json2Array2()方法：jsonArr=="+jsonArr);
         // 输出结果：jsonArr==[{"age":16,"id":"P001","name":"TOM"},{"age":21,"id":"P002","name":"JACKSON"},{"age":20,"id":"P003","name":"MARTIN"}]
     }

     /**
      * list集合转json格式字符串
      */
     public void list2Json(){
         List list = new ArrayList();
         User user1 = new User("L001","TOM",16);
         list.add(user1);
         User user2 = new User("L002","JACKSON",21);
         list.add(user2);
         User user3 = new User("L003","MARTIN",20);
         list.add(user3);
         String jsonText = JSON.toJSONString(list, true);
         System.out.println("list2Json()方法：jsonText=="+jsonText);
         //输出结果：jsonText==[{"age":16,"id":"L001","name":"TOM"},{"age":21,"id":"L002","name":"JACKSON"},{"age":20,"id":"L003","name":"MARTIN"}]
     }

     /**
      * list集合转json格式字符串
      */
     public void list2Json2(){
         List list = new ArrayList();
         Address address1 = new Address("广东省","深圳市","科苑南路","580053");
         User user1 = new User("L001","TOM",16,address1);
         list.add(user1);
         Address address2 = new Address("江西省","南昌市","阳明路","330004");
         User user2 = new User("L002","JACKSON",21,address2);
         list.add(user2);
         Address address3 = new Address("陕西省","西安市","长安南路","710114");
         User user3 = new User("L003","MARTIN",20,address3);
         list.add(user3);
         String jsonText = JSON.toJSONString(list, true);
         System.out.println("list2Json2()方法：jsonText=="+jsonText);
         //输出结果：jsonText==[{"address":{"city":"深圳市","post":"580053","province":"广东省","street":"科苑南路"},"age":16,"id":"L001","name":"TOM"},{"address":{"city":"南昌市","post":"330004","province":"江西省","street":"阳明路"},"age":21,"id":"L002","name":"JACKSON"},{"address":{"city":"西安市","post":"710114","province":"陕西省","street":"长安南路"},"age":20,"id":"L003","name":"MARTIN"}]
     }

     /**
      * map转json格式字符串
      */
     public void map2Json(){
         Map map = new HashMap();
         Address address1 = new Address("广东省","深圳市","科苑南路","580053");
         map.put("address1", address1);
         Address address2 = new Address("江西省","南昌市","阳明路","330004");
         map.put("address2", address2);
         Address address3 = new Address("陕西省","西安市","长安南路","710114");
         map.put("address3", address3);
         String jsonText = JSON.toJSONString(map, true);
         System.out.println("map2Json()方法：jsonText=="+jsonText);
         //输出结果：jsonText=={"address1":{"city":"深圳市","post":"580053","province":"广东省","street":"科苑南路"},"address2":{"city":"南昌市","post":"330004","province":"江西省","street":"阳明路"},"address3":{"city":"西安市","post":"710114","province":"陕西省","street":"长安南路"}}
     }



     public static void main(String[] args)
     {
         FastJsonTest1 test = new FastJsonTest1();
         //数组转json格式字符串
         test.array2Json();

         //json格式字符串转数组
         test.json2Array();

         //数组转json格式字符串
         test.array2Json2();

         //json格式字符串转数组
         test.json2Array2();

         //list集合转json格式字符串
         test.list2Json();

         //list集合转json格式字符串
         test.list2Json2();

         //map转json格式字符串
         test.map2Json();
     }
 }

控制台输出结果：

 array2Json()方法：jsonText==["bill","green","maks","jim"]
 json2Array()方法：jsonArr==["bill","green","maks","jim"]
 array2Json2()方法：jsonText==[{
     "age":16,
     "id":"P001",
     "name":"TOM"
 },{
     "age":21,
     "id":"P002",
     "name":"JACKSON"
 },{
     "age":20,
     "id":"P003",
     "name":"MARTIN"
 }]
 json2Array2()方法：jsonArr==[{"age":16,"id":"P001","name":"TOM"},{"age":21,"id":"P002","name":"JACKSON"},{"age":20,"id":"P003","name":"MARTIN"}]
 list2Json()方法：jsonText==[
     {
         "age":16,
         "id":"L001",
         "name":"TOM"
     },
     {
         "age":21,
         "id":"L002",
         "name":"JACKSON"
     },
     {
         "age":20,
         "id":"L003",
         "name":"MARTIN"
     }
 ]
 list2Json2()方法：jsonText==[
     {
         "address":{
             "city":"深圳市",
             "post":"580053",
             "province":"广东省",
             "street":"科苑南路"
         },
         "age":16,
         "id":"L001",
         "name":"TOM"
     },
     {
         "address":{
             "city":"南昌市",
             "post":"330004",
             "province":"江西省",
             "street":"阳明路"
         },
         "age":21,
         "id":"L002",
         "name":"JACKSON"
     },
     {
         "address":{
             "city":"西安市",
             "post":"710114",
             "province":"陕西省",
             "street":"长安南路"
         },
         "age":20,
         "id":"L003",
         "name":"MARTIN"
     }
 ]
 map2Json()方法：jsonText=={"address1":{
     "city":"深圳市",
     "post":"580053",
     "province":"广东省",
     "street":"科苑南路"
 },"address2":{
     "city":"南昌市",
     "post":"330004",
     "province":"江西省",
     "street":"阳明路"
 },"address3":{
     "city":"西安市",
     "post":"710114",
     "province":"陕西省",
     "street":"长安南路"
 }}

附：javabean类 User.java

 package fastJson.test;

 import java.io.Serializable;

 public class User implements Serializable {

     private static final long serialVersionUID = 1L;

     private String id;
     private String name;
     private int age;
     private Address address;

     public User() {
         super();
     }

     public User(String id, String name, int age) {
         super();
         this.id = id;
         this.name = name;
         this.age = age;
     }

     public User(String id, String name, int age, Address address)
     {
         super();
         this.id = id;
         this.name = name;
         this.age = age;
         this.address = address;
     }

     public int getAge() {
         return age;
     }

     public void setAge(int age) {
         this.age = age;
     }

     public String getId() {
         return id;
     }

     public void setId(String id) {
         this.id = id;
     }

     public String getName() {
         return name;
     }

     public void setName(String name) {
         this.name = name;
     }

     public Address getAddress()
     {
         return address;
     }

     public void setAddress(Address address)
     {
         this.address = address;
     }

 }

Address.java

 package fastJson.test;

 import java.io.Serializable;

 public class Address implements Serializable
 {
     private static final long serialVersionUID = 1L;

     private String province;
     private String city;
     private String street;
     private String post;

     public Address()
     {
         super();
     }

     public Address(String province, String city, String street, String post)
     {
         super();
         this.province = province;
         this.city = city;
         this.street = street;
         this.post = post;
     }

     public String getCity()
     {
         return city;
     }

     public void setCity(String city)
     {
         this.city = city;
     }

     public String getPost()
     {
         return post;
     }

     public void setPost(String post)
     {
         this.post = post;
     }

     public String getProvince()
     {
         return province;
     }

     public void setProvince(String province)
     {
         this.province = province;
     }

     public String getStreet()
     {
         return street;
     }

     public void setStreet(String street)
     {
         this.street = street;
     }

 }