Json解析使用方法

​​   ​1.调查需要传入的服务器网址信息。
   2.设置对应的请求参数:
params = "{\"Input\":{\"lang\":\"0\",\"act_status\":\"1\",\"__flag\":0}, \"SN\":\"3+inmuTDDAgwTh1V2rSGHA==\"}";
    3.通过调用post方法来解析资源转换成字符串数组。
                   // TODO Auto-generated method stub
                     String jsonResult = post(url, params);
                        Message msg = new Message();
msg.obj = jsonResult;
                     mHandler.sendMessage(msg);
   4.POST请求静态方法:
/**
* 发送HttpPost请求

* @param strURL
*            服务地址
* @param params
*            json字符串,例如: "{ \"id\":\"12345\" }" ;其中属性名必须带双引号<br/>
* @return 成功:返回json字符串<br/>
*/
public static String post(String strURL, String params) {
System.out.println(strURL);
System.out.println(params);
try {
URL url = new URL(strURL);// 创建连接
HttpURLConnection connection = (HttpURLConnection) url
.openConnection();
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setUseCaches(false);
connection.setInstanceFollowRedirects(true);
connection.setRequestMethod("POST"); // 设置请求方式
connection.setRequestProperty("Accept", "application/json"); // 设置接收数据的格式
connection.setRequestProperty("Content-Type", "application/json"); // 设置发送数据的格式
connection.connect();
OutputStreamWriter out = new OutputStreamWriter(
connection.getOutputStream(), "UTF-8"); // utf-8编码
out.append(params);
out.flush();
out.close();
// 读取响应
int length = (int) connection.getContentLength();// 获取长度
InputStream is = connection.getInputStream();
if (length != -1) {
byte[] data = new byte[length];
byte[] temp = new byte[512];
int readLen = 0;
int destPos = 0;
while ((readLen = is.read(temp)) > 0) {
System.arraycopy(temp, 0, data, destPos, readLen);
destPos += readLen;
}
String result = new String(data, "UTF-8"); // utf-8编码
System.out.println(result);
return result;
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return "error"; // 自定义错误信息
}
6.接收到handler然后获取jsonArray数组中的数据,使用get方法;
Handler mHandler = new Handler(){
public void handleMessage(android.os.Message msg) {
String Result = (String) msg.obj;
/**
* 这里需要分析服务器回传的json格式数据,
*/
try {
JSONObject jsonObject = new JSONObject(Result);
Toast.makeText(getApplicationContext(),"当前数量", 1).show();
JSONArray jsonArray = jsonObject.getJSONArray("Activities");
Toast.makeText(getApplicationContext(),"当前数量为:"+jsonArray.length(), 1).show();
for (int i = 0; i < jsonArray.length(); i++) {
Toast.makeText(getApplicationContext(), "数组数量大于0", 1).show();
JSONObject jsonObject2 = (JSONObject) jsonArray.opt(i);
String id = jsonObject2.getString("id");
String imageHeight = jsonObject2.getString("imageHeight");
String actStatus = jsonObject2.getString("actStatus");
mTvResult.setText("当前数量为:"+jsonArray.length()+id + actStatus + imageHeight);
JSONArray actStartTime = jsonObject2.getJSONArray("actStartTime");
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
};
};


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