Android开发中json数据解析工具类

• -----------------------------------------------------用Android自带的JSONArray及JSONObject处理json数据----------------------------------------------------------------

  在下面方法中传入的String path是数据所在的服务器url地址

  public class dealJsonUtil {

  /*
  * 获取"数组形式"的JSON数据，
  */
  public static List<Map<String, String>> getJSONArray(String path) throws Exception {
  String json = null;
  List<Map<String, String>> list = new ArrayList<Map<String, String>>();
  Map<String, String> map = null;
  URL url = new URL(path);
  /**HttpURLConnection对象,从网络中获取网页数据*/
  HttpURLConnection conn = (HttpURLConnection) url.openConnection();
  /**设置超时时间为5秒*/
  conn.setConnectTimeout(5 * 1000);
  /**HttpURLConnection是通过HTTP协议请求path路径的，所以需要设置请求方式,可以不设置，因为默认为GET*/
  conn.setRequestMethod("GET");
  /**判断请求是否成功，成功时请求码为200，否则失败*/
  if (conn.getResponseCode() == 200) {
  /**获取数据输入流*/
  InputStream is = conn.getInputStream();
  /**把输入流转换成字符数组*/
  byte[] data = readStream2Array(is);
  /**字符数组转换成字符串*/
  json = new String(data);
  /*
  * 数据形式：[{"stuNo":100,"name":"小明"},{"stuNo":101,"name":"小张"}]数据为数组形式，直接用android框架 JSONArray读取数据，转换成Array
  */
  JSONArray jsonArray = new JSONArray(json);
  for (int i = 0; i < jsonArray.length(); i++) {
  /**获取每条数据中的对象*/
  JSONObject item = jsonArray.getJSONObject(i);
  /**注意key值要一致*/
  int id = item.getInt("stuNo");
  String name = item.getString("name");
  map = new HashMap<String, String>();
  map.put("stuNo", id + "");
  map.put("name", name);
  list.add(map);
  }
  }
  return list;
  }
  
  
  /**
  * 获取"对象形式"的JSON数据，
  *
  * @param path 网页路径
  * @return 返回List
  * @throws Exception
  */
  public static List<Map<String, String>> getJSONObject(String path) throws Exception {
  List<Map<String, String>> list = new ArrayList<Map<String, String>>();
  Map<String, String> map = null;
  URL url = new URL(path);
  HttpURLConnection conn = (HttpURLConnection) url.openConnection();
  conn.setConnectTimeout(5 * 1000); // 单位是毫秒，设置超时时间为5秒
  conn.setRequestMethod("GET");
  if (conn.getResponseCode() == 200) {
  InputStream is = conn.getInputStream();
  byte[] data = readStream2Array(is);
  String json = new String(data);
  /*
  * 数据形式：{"total":2,"success":true,"arrayData":[{"id":1,"name":"小猪"},{"id":2,"name":"小猫"}]}
  * 返回的数据形式是一个Object类型，所以可以直接转换成一个Object*/
  JSONObject jsonObject = new JSONObject(json);
  int total = jsonObject.getInt("total");
  Boolean success = jsonObject.getBoolean("success");
  /**json对象中有一个数组数据，又可以使用getJSONArray获取数组*/
  JSONArray jsonArray = jsonObject.getJSONArray("arrayData");
  for (int i = 0; i < jsonArray.length(); i++) {
  JSONObject item = jsonArray.getJSONObject(i);
  int id = item.getInt("id");
  String name = item.getString("name");
  map = new HashMap<String, String>();
  map.put("id", id + "");
  map.put("name", name);
  list.add(map);
  }
  }
  return list;
  }
  
  
  /**
  * 获取类型复杂的JSON数据
  */
  public static List<Map<String, String>> getComplexJSON(String path) throws Exception {
  List<Map<String, String>> list = new ArrayList<Map<String, String>>();
  Map<String, String> map = null;
  URL url = new URL(path);
  HttpURLConnection conn = (HttpURLConnection) url.openConnection();
  conn.setConnectTimeout(5 * 1000);
  conn.setRequestMethod("GET");
  if (conn.getResponseCode() == 200) {
  InputStream is = conn.getInputStream();
  byte[] data = readStream2Array(is);
  String json = new String(data);
  /*
  * 数据形式： {"name":"小猪", "age":23, "content":{"questionsTotal":2, "questions": [ { "question": "what's your name?", "answer": "小猪"}, {"question": "what's your age", "answer": "23"}] } }
  */
  JSONObject jsonObject = new JSONObject(json);
  String name = jsonObject.getString("name");
  int age = jsonObject.getInt("age");
  Log.i("abc", "name:" + name + " | age:" + age);
  JSONObject contentObject = jsonObject.getJSONObject("content");
  String questionsTotal = contentObject.getString("questionsTotal");
  JSONArray contentArray = contentObject.getJSONArray("questions");
  for (int i = 0; i < contentArray.length(); i++) {
  JSONObject item = contentArray.getJSONObject(i);
  String question = item.getString("question");
  String answer = item.getString("answer");
  map = new HashMap<String, String>();
  map.put("question", question);
  map.put("answer", answer);
  list.add(map);
  }
  }
  return list;
  }
  
  
  /**
  * 把输入流转换成字符数组
  */
  public static byte[] readStream2Array(InputStream inputStream) throws Exception {
  ByteArrayOutputStream bout = new ByteArrayOutputStream();
  byte[] buffer = new byte[1024];
  int len = 0;
  while ((len = inputStream.read(buffer)) != -1) {
  bout.write(buffer, 0, len);
  }
  bout.close();
  inputStream.close();
  return bout.toByteArray();
  }
  }