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();
}
}