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();
}
}

标签： 服务器 网络

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