Android中的JSON详细总结(2)_H5之家 - 中国HTML5教程资源分享第一站

应用JSONObject存储Map类型数值：

public static JSONObject getJSON(Map map) { Iterator iter = map.entrySet().iterator(); JSONObject holder = new JSONObject(); while (iter.hasNext()) { Map.Entry pairs = (Map.Entry) iter.next(); String key = (String) pairs.getKey(); Map m = (Map) pairs.getValue(); JSONObject data = new JSONObject(); try { Iterator iter2 = m.entrySet().iterator(); while (iter2.hasNext()) { Map.Entry pairs2 = (Map.Entry) iter2.next(); data.put((String) pairs2.getKey(), (String) pairs2 .getValue()); } holder.put(key, data); } catch (JSONException e) { Log.e("Transforming", "There was an error packaging JSON", e); } } return holder; } 下面是详细的例子：

import java.io.ByteArrayOutputStream; import java.io.InputStream; import java.net.*; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import org.json.JSONArray; import org.json.JSONObject; import android.util.Log; public class JSON { /** * 获取"数组形式"的JSON数据， * 数据形式：[{"id":1,"name":"小猪"},{"id":2,"name":"小猫"}] * @param path 网页路径 * @return 返回List * @throws Exception */ 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 conn = (HttpURLConnection) url.openConnection();// 利用HttpURLConnection对象,我们可以从网络中获取网页数据. conn.setConnectTimeout(5 * 1000); // 单位是毫秒，设置超时时间为5秒 conn.setRequestMethod("GET"); // 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 if (conn.getResponseCode() == 200) {// 判断请求码是否是200码，否则失败 InputStream is = conn.getInputStream(); // 获取输入流 byte[] data = readStream(is); // 把输入流转换成字符数组 json = new String(data); // 把字符数组转换成字符串 //数据形式：[{"id":1,"name":"小猪","age":22},{"id":2,"name":"小猫","age":23}] JSONArray jsonArray = new JSONArray(json); //数据直接为一个数组形式，所以可以直接用android提供的框架JSONArray读取JSON数据，转换成Array for (int i = 0; i < jsonArray.length(); i++) { JSONObject item = jsonArray.getJSONObject(i); //每条记录又由几个Object对象组成 int id = item.getInt("id"); // 获取对象对应的值 String name = item.getString("name"); map = new HashMap<String, String>(); // 存放到MAP里面 map.put("id", id + ""); map.put("name", name); list.add(map); } } // ***********测试数据****************** for (Map<String, String> list2 : list) { String id = list2.get("id"); String name = list2.get("name"); Log.i("abc", "id:" + id + " | name:" + name); } return list; } /** * 获取"对象形式"的JSON数据， * 数据形式：{"total":2,"success":true,"arrayData":[{"id":1,"name":"小猪"},{"id":2,"name":"小猫"}]} * @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();// 利用HttpURLConnection对象,我们可以从网络中获取网页数据. conn.setConnectTimeout(5 * 1000); // 单位是毫秒，设置超时时间为5秒 conn.setRequestMethod("GET"); // 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 if (conn.getResponseCode() == 200) {// 判断请求码是否是200码，否则失败 InputStream is = conn.getInputStream(); // 获取输入流 byte[] data = readStream(is); // 把输入流转换成字符数组 String json = new String(data); // 把字符数组转换成字符串 //数据形式：{"total":2,"success":true,"arrayData":[{"id":1,"name":"小猪"},{"id":2,"name":"小猫"}]} JSONObject jsonObject=new JSONObject(json); //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 int total=jsonObject.getInt("total"); Boolean success=jsonObject.getBoolean("success"); Log.i("abc", "total:" + total + " | success:" + success); //测试数据 JSONArray jsonArray = jsonObject.getJSONArray("arrayData");//里面有一个数组数据，可以用getJSONArray获取数组 for (int i = 0; i < jsonArray.length(); i++) { JSONObject item = jsonArray.getJSONObject(i); // 得到每个对象 int id = item.getInt("id"); // 获取对象对应的值 String name = item.getString("name"); map = new HashMap<String, String>(); // 存放到MAP里面 map.put("id", id + ""); map.put("name", name); list.add(map); } } // ***********测试数据****************** for (Map<String, String> list2 : list) { String id = list2.get("id"); String name = list2.get("name"); Log.i("abc", "id:" + id + " | name:" + name); } return list; } /** * 获取类型复杂的JSON数据 *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"}] } } * @param path 网页路径 * @return 返回List * @throws Exception */ public static List<Map<String, String>> getJSON(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();// 利用HttpURLConnection对象,我们可以从网络中获取网页数据. conn.setConnectTimeout(5 * 1000); // 单位是毫秒，设置超时时间为5秒 conn.setRequestMethod("GET"); // 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 if (conn.getResponseCode() == 200) {// 判断请求码是否是200码，否则失败 InputStream is = conn.getInputStream(); // 获取输入流 byte[] data = readStream(is); // 把输入流转换成字符数组 String json = new String(data); // 把字符数组转换成字符串 /*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); //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 String name=jsonObject.getString("name"); int age=jsonObject.getInt("age"); Log.i("abc", "name:" + name + " | age:" + age); //测试数据 JSONObject contentObject=jsonObject.getJSONObject("content"); //获取对象中的对象 String questionsTotal=contentObject.getString("questionsTotal"); //获取对象中的一个值 Log.i("abc", "questionsTotal:" + questionsTotal); //测试数据 JSONArray contentArray=contentObject.getJSONArray("questions"); //获取对象中的数组 for (int i = 0; i < contentArray.length(); i++) { JSONObject item = contentArray.getJSONObject(i); // 得到每个对象 String question = item.getString("question"); // 获取对象对应的值 String answer = item.getString("answer"); map = new HashMap<String, String>(); // 存放到MAP里面 map.put("question", question); map.put("answer", answer); list.add(map); } } // ***********测试数据****************** for (Map<String, String> list2 : list) { String question = list2.get("question"); String answer = list2.get("answer"); Log.i("abc", "question:" + question + " | answer:" + answer); } return list; } /** * 把输入流转换成字符数组 * @param inputStream 输入流 * @return 字符数组 * @throws Exception */ public static byte[] readStream(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(); } }