[Android实例] android json

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(); 
} 
}

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