1 //一个实体类 2     public class Person { 3         private String name; 4         private int age; 5          6         public String getName() { 7             return name; 8         } 9         public void setName(String name) {10             this.name = name;11         }12         public int getAge() {13             return age;14         }15         public void setAge(int age) {16             this.age = age;17         }18         19         public String toString()20         {21             return name + ":" +age;22         }23         24         25     }26     27     // 得到json28     private String getJson(){29         List<Person> person = new ArrayList<Person> ();30         for (int i = 0; i < 5 ; i++){31             Person p = new Person();32             p.setName("name" + i);33             p.setAge(i * 5);34             person.add(p);35         }36         37         // 对象转json字符串38         Gson gson = new Gson();39         return gson.toJson(person);40         41     }42     43     //用gson将json字符串转换成单一实体类44     private Person getPerson(){45         String jsonStr = getJson();46         Gson gson = new Gson();47         48         //两个参数，json字符串、需要转换的对象类型49         Person person = gson.fromJson(jsonStr, Person.class);50         51         return person;52     }53     54     //用gson将json字符串转换成对象列表55     private List<Person> getPersonList(){56         String jsonStr = getJson();57         Gson gson = new Gson();58         59         //TypeToken是gson提供的数据类型转换器，可以支持各种数据集合类型转换60         List<Person> list = gson.fromJson(jsonStr, new TypeToken<List<Person>>(){}.getType());61         62         return list;63     }