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2.JSONObject的使用方法

2.1 示例代码

    //org.json.JSONArray;      //org.json.JSONObject;      private void parseJSONWithJSONObject(String jsonData){          try {              //将json字符串jsonData装入JSON数组，即JSONArray              //jsonData可以是从文件中读取，也可以从服务器端获得              JSONArray jsonArray = new JSONArray(jsonData);              for (int i = 0; i< jsonArray.length(); i++) {                  //循环遍历，依次取出JSONObject对象                  //用getInt和getString方法取出对应键值                  JSONObject jsonObject = jsonArray.getJSONObject(i);                  int stu_no = jsonObject.getInt("stu_no");                  String stu_name = jsonObject.getString("stu_name");                  String stu_sex = jsonObject.getString("stu_sex");                  Log.d("MainActivity","stu_no: " + stu_no);                  Log.d("MainActivity","stu_name: " + stu_name);                  Log.d("MainActivity","stu_sex: " + stu_sex);              }          } catch (Exception e) {              e.printStackTrace();          }      }

2.2 字符串jsonData如下，图为运行结果

[{ "stu_no":12345,"stu_name":"John","stu_sex":"male"  },{ "stu_no":12346,"stu_name":"Tom","stu_sex":"male"  },{"stu_no":12347,"stu_name":"Lily","stu_sex":"female"}]

3.GSON的使用方法

3.1 下载并安装

3.2 方法简介

3.3 示例代码

3.3.1 单个对象的解析

public class Student {      private int stu_no;      private String stu_name;      private String stu_sex;        Student(int stu_no,String stu_name,String stu_sex){          this.stu_no = stu_no;          this.stu_name = stu_name;          this.stu_sex = stu_sex;      }  }    // 序列化，将Student对象stu转换为字符串str  Student stu = new Student(123,"Tom","male");  Gson gson = new Gson();  String str = gson.toJson(stu);     //反序列化，将字符串转换为Student对象  jsonData = "{ \"stu_no\":12345,\"stu_name\":\"John\",\"stu_sex\":\"male\" }";  Gson gson = new Gson();  Student student = gson.fromJson(jsonData,Student.class);

3.3.2 JSON数组的解析（原生类）

Gson gson = new Gson();  int[] ints = {1, 2, 3, 4, 5};  String[] strings = {"abc", "def", "ghi"};    //序列化（serialization）  //将整数数组转换为JSON数组  gson.toJson(ints);     // ==> [1,2,3,4,5]  //将字符串数组转换为JSON数组  gson.toJson(strings);  // ==> ["abc", "def", "ghi"]    // 反序列化（Deserialization）  // 将JSON数组转换为原生类数组  // ints2、string2与ints、strings相等  int[] ints2 = gson.fromJson("[1,2,3,4,5]", int[].class);   String[] strings2 = gson.fromJson("[\"abc\", \"def\", \"ghi\"]",String[].class);

3.3.3 JSON数组的解析（自定义类）

//对于类似于2.2中的jsonData，包含3个Student对象  //与原生类不同，需要借助TypeToken获得期望解析成的数据类型  //下列代码运行后，students包含三个Student对象  Gson gson = new Gson();  List<Student> students;  students = gson.fromJson(jsonData, new TypeToken<List<Student>>(){}.getType()); // ==>[stu0,stu1,stu2]

3.4 更多方法

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