Android 一个封装好的http获取Json数据的类

一个封装好的json类,可以通过http协议远程获取服务器上的json格式的文本文件中的信息。

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();

}

}

来源: http://www.jdzhao.com/component/show_1004_122.html