JSON解析(1)

来源：互联网发布：数据库管理dba 编辑：程序博客网时间：2024/06/03 20:08

1.什么是JSON

JSON ：数据组织格式

xml：
<books>
   <book>
      <id>100</id>
      <name>Android编程</name>
   </book>
   <book>
        <id>101</id>
        <name>JAVA编程</name>
   </book>
</books>

2.JSON格式

{"名称":值}
{"名称":{"名称1":值1}}

{"名称1":值1,"名称2":值2}

{"名称1":[{"名称1":值1},{"名称1":值1}]}

值类型: String int jsonObject array

{"id":100} {"name":"Android编程"}
{"book1":{"id":100,"name":"Android编程"}}
{"book2":{"id":101,"name":"JAVA编程"}}

[{"book":{"id":100,"name":"Android编程"}},{"book":{"id":101,"name":"JAVA编程"}}]

{"books":[{"book":{"id":100,"name":"Android编程"}},{"book":{"id":101,"name":"JAVA编程"}}]}

3.JSON解析:

public void testJson() {        String jsonStr = "{\"name\":\"Android编程\"}";        try {            JSONObject jsonObject = new JSONObject(jsonStr);            String bookName = jsonObject.getString("name");            Log.e("tag", "bookName  :" + bookName);        } catch (JSONException e) {            e.printStackTrace();        }    }    public void testJsonBook() {        String jsonStr = "{\"book1\":{\"id\":100,\"name\":\"Android编程\"}}";        try {            JSONObject jsonObject = new JSONObject(jsonStr);            JSONObject jsonObject1 = jsonObject.getJSONObject("book1");            String bookName = jsonObject1.getString("name");            int bookId = jsonObject1.getInt("id");            Log.e("tag", "bookName :" + bookName + ", bookId :" + bookId);        } catch (JSONException e) {            e.printStackTrace();        }    }    public void testJsonArray() {        String jsonStr = "[{\"book\":{\"id\":100,\"name\":\"Android编程\"}},{\"book\":{\"id\":101,\"name\":\"JAVA编程\"}}]";        try {            JSONArray jsonArray = new JSONArray(jsonStr);            int length = jsonArray.length();            for (int i = 0; i < length; i++) {                JSONObject jsonObject = jsonArray.getJSONObject(i);                JSONObject jsonBook = jsonObject.getJSONObject("book");                String bookName = jsonBook.getString("name");                int bookId = jsonBook.getInt("id");                Log.e("tag", "bookName :" + bookName + ", bookId :" + bookId);            }        } catch (JSONException e) {            e.printStackTrace();        }

从json文件中解析json。

{"books":[{"book":{"id":100,"name":"Android编程"}},{"book":{"id":101,"name":"JAVA编程"}}]}

    public void test() throws IOException {        AssetManager assetManager = getContext().getAssets();        InputStream inputStream = assetManager.open("book.json");        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));        String line = "";        StringBuilder stringBuilder = new StringBuilder();        while ((line = reader.readLine()) != null) {            stringBuilder.append(line);        }        String jsonStr = stringBuilder.toString();        try {            JSONObject jsonObject = new JSONObject(jsonStr);            String books = jsonObject.getString("books");            JSONArray jsonArray = new JSONArray(books);            int length = jsonArray.length();            for (int i = 0; i < length; i++) {                JSONObject jsonObject1 = jsonArray.getJSONObject(i);                JSONObject jsonBook = jsonObject1.getJSONObject("book");                int id = jsonBook.getInt("id");                String name = jsonBook.getString("name");                Log.e("tag", "books:book:id=" + id + "name=" + name);            }        } catch (JSONException e) {            e.printStackTrace();        }    }

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