android json解析帶object的字符串

背景：得到的接口返回的字符串中一個字符串類型的數據內還有object類型，如何解析成列在列表中？

接口返回數據：

{
"agentRunId":10697,
"applicationId":76,
"errorId":124,
"exceptionClass":"org.springframework.web.util.NestedServletException",
"message":"Request processing failed; nested exception is java.lang.NullPointerException",
"params":"{\"custom_params\":{\"http_status\":500,\"thread_name\":\"http-bio-8090-exec-6\"},\"request_referer\":\"http://localhost:8090/tpm/account/2/alerts/policyApp\",\"request_uri\":\"/tpm/account/2/dashboard/29/overview\",\"stack_trace\":[\"\\torg.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:894)\",\"\\torg.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)\",\"\\tjavax.servlet.http.HttpServlet.service(HttpServlet.java:620)\",\"\\tjavax.servlet.http.HttpServlet.service(HttpServlet.java:727)\",。。省略。。,\"\\tjava.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)\",\"\\tjava.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)\",\"\\tjava.lang.Thread.run(Thread.java:695)\"]}",
"path":"WebTransaction/SpringController/DashboardShowController/dashboardView",
"startTime":"2014-09-22 14:56:22",
"userId":0
}

"params":就是一個字符串類型，但是裏面包含很多Object

解析方法：

<span style="font-size:14px;">public class JsonDemo {

	public static void main(String[] args) {
		String data = sendGet("http://115.28.189.59/json.html", "utf-8");//接口地址，返回接口數據
		JSONObject jsonObject = new JSONObject(data); //反序列化
//		int angentRunId=jsonObject.getInt("agentRunId");
//		int applicationId=jsonObject.getInt("applicationId");
//		int errorId=jsonObject.getInt("errorId");
		String exceptionClass=jsonObject.getString("exceptionClass");//excrption
		String message=jsonObject.getString("message");//錯誤信息
		String params = jsonObject.getString("params");//獲取params對應的字符串
		String path = jsonObject.getString("path");//path
		String startTime = jsonObject.getString("startTime");//時間
		JSONObject paraJsonObject = new JSONObject(params);//params字符串
		JSONObject cp = paraJsonObject.getJSONObject("custom_params");//獲取object數據，達到目的
		//自定義參數
		String[] names = JSONObject.getNames(cp);//Android使用：JSONArray names = defineJsonObject.names();
		//自定義參數
		for (int i = 0; i < names.length; i++) {
			System.out.println(names[i]+":"+cp.get(names[i]));
		}
		//請求參數
		System.out.println("request_referer:"+paraJsonObject.get("request_referer"));
		System.out.println("request_uri:"+paraJsonObject.get("request_uri"));
		//stack traces
		JSONArray trace = paraJsonObject.getJSONArray("stack_trace");
		for (int i = 0; i < trace.length(); i++) {
			System.out.println(trace.get(i));
		}
	}</span>

//獲取接口返回數據，方法不一
	public static String sendGet(String url, String charset) {
		String result = "";
		BufferedReader in = null;
		try {
			URL realUrl = new URL(url);
			// 打開和URL之間的連接
			URLConnection connection = realUrl.openConnection();
			// 設置通用的請求屬性
			connection.setRequestProperty("accept", "*/*");
			connection.setRequestProperty("connection", "Keep-Alive");
//			String userAgent = System.getProperty("http.agent");
//			connection.setRequestProperty("user-agent", userAgent);
			connection.setConnectTimeout(1000 * 10);
			// 建立實際的連接
			connection.connect();
			
			// 定義 BufferedReader輸入流來讀取URL的響應
			in = new BufferedReader(new InputStreamReader(
					connection.getInputStream(), charset));
			String line;
			while ((line = in.readLine()) != null) {
				result += line;
			}
		} catch (Exception e) {
			System.out.println("發送GET請求出現異常！" + e);
			result = "";
			e.printStackTrace();
		}
		// 使用finally塊來關閉輸入流
		finally {
			try {
				if (in != null) {
					in.close();
				}
			} catch (Exception e2) {
				e2.printStackTrace();
			}
		}
//		System.out.println(result);
		return result;
	}
}