package com.example.volleylearn; import java.util.ArrayList; import java.util.List; import java.util.Map; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import android.test.AndroidTestCase; import android.util.Log; import com.google.gson.Gson; import com.google.gson.reflect.TypeToken; /* 1. 将json格式的字符串{}转换为Java对象, 使用原生API 2. 将json格式的字符串{}转换为Java对象, 使用GSON 3. 将json格式的字符串[]转换为Java对象的List, 使用原生API 4. 将json格式的字符串[]转换为Java对象的List, 使用GSON 5. 将Java对象转换为json字符串{}, 使用GSON 6. 将Java对象的List转换为json字符串[], 使用GSON */ public class JsonTest extends AndroidTestCase{ /* * 1. 将json格式的字符串{}转换为Java对象, 使用原生API */ public void testJsonToObject() throws JSONException { String jsonString = "{\"id\":2, \"name\":\"大虾\", \"price\":12.3,\"imagePath\":\"http://192.168.10.165:8080/L05_Server/images/f1.jpg\"}"; //将json字符串封装为JSONObject对象 JSONObject jsonObject = new JSONObject(jsonString); //从对象中根据key得到对应的value int id = jsonObject.getInt("id"); String name = jsonObject.getString("name"); double price = jsonObject.getDouble("price"); String imagePath = jsonObject.getString("imagePath"); //封装ShopInfo对象 ShopInfo shopInfo = new ShopInfo(id, name, price, imagePath); Log.e("TAG", shopInfo.toString()); } /* * 1. 将json格式的字符串{}转换为Java对象, 使用GSON */ public void testJsonToObject2() { String jsonString = "{\"id\":3, \"name\":\"大虾\", \"price\":12.3,\"imagePath\":\"http://192.168.10.165:8080/L05_Server/images/f1.jpg\"}"; ShopInfo shopInfo = new Gson().fromJson(jsonString, ShopInfo.class); Log.e("TAG", shopInfo.toString()); } /* * 3. 将json格式的字符串[]转换为Java对象的List, 使用原生API */ public void testJsonToList() throws JSONException { String jsonString = "[{\"id\":3, \"name\":\"大虾\", \"price\":12.3,\"imagePath\":\"http://192.168.10.165:8080/L05_Server/images/f1.jpg\"}," + "{\"id\":5, \"name\":\"大虾2\", \"price\":128.3,\"imagePath\":\"http://192.168.10.165:8080/L05_Server/images/f2.jpg\"}]"; List<ShopInfo> list = new ArrayList<ShopInfo>(); //1. 将json字符串包装JSONArray对象 JSONArray jsonArray = new JSONArray(jsonString); //2. 遍历JSONArray对象所有元素(JSONObject), 并将每个元素封装为shopInfo, 并添加到List for(int i=0;i<jsonArray.length();i++) { JSONObject jsonObject = jsonArray.getJSONObject(i); //从对象中根据key得到对应的value int id = jsonObject.getInt("id"); String name = jsonObject.getString("name"); double price = jsonObject.getDouble("price"); String imagePath = jsonObject.getString("imagePath"); //封装ShopInfo对象 ShopInfo shopInfo = new ShopInfo(id, name, price, imagePath); list.add(shopInfo); } Log.e("TAG", list.toString()); } /* * 4. 将json格式的字符串[]转换为Java对象的List, 使用GSON */ public void testJsonToList2() throws JSONException { String jsonString = "[{\"id\":4, \"name\":\"大虾\", \"price\":12.3,\"imagePath\":\"http://192.168.10.165:8080/L05_Server/images/f1.jpg\"}," + "{\"id\":6, \"name\":\"大虾2\", \"price\":128.3,\"imagePath\":\"http://192.168.10.165:8080/L05_Server/images/f2.jpg\"}]"; List<ShopInfo> list = new Gson().fromJson(jsonString, new TypeToken<List<ShopInfo>>(){}.getType()); Log.e("TAG", list.toString()); } /* 5. 将Java对象转换为json字符串{}, 使用GSON */ public void testObjectToJson() { ShopInfo info = new ShopInfo(3, "KK", 1000, "http://www.sina.com"); String json = new Gson().toJson(info); Log.e("TAG", json); } /* 6. 将Java对象的List转换为json字符串[], 使用GSON */ public void testListToJson() { List<ShopInfo> list = new ArrayList<ShopInfo>(); list.add(new ShopInfo(3, "KK", 1000, "http://www.sina.com")); list.add(new ShopInfo(4, "KK2", 2000, "http://www.sina.com222")); String json = new Gson().toJson(list); Log.e("TAG", json); } public void testJsonToMap() { String jsonString = "{\"my name\":\"大虾\", \"1\":12}"; Map<String, Object> map = new Gson().fromJson(jsonString, new TypeToken<Map<String, Object>>(){}.getType()); Log.e("TAG", map.toString()); } }
json Gson
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