Domino毫秒級查詢利器Elasticsearch(三)

       前面兩篇已經介紹了同步數據到Elasticsearch，接下來要進行查詢數據了，查詢數據毫秒級的體驗，這纔是我們要的結果，Elasticsearch的查詢和Sql有些區別，有專門的邏輯，其實根據自己的實際情況就可以查出數據。

       由於Elasticsearch已經支持RESTful的訪問方式，如果使用JS訪問會涉及到跨域的問題,在Domino平臺，可以使用java代理訪問Elasticsearch，獲取數據後再返回前端。這就可以避免前端訪問跨域問題。

       查詢時間說明 ：took ： Elasticsearch執行搜索的時間（以毫秒爲單位）

        以下查詢的幾張簡要圖說明：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Hashtable;
import java.util.StringTokenizer;

import lotus.domino.*;

public class JavaAgent extends AgentBase {
	
	public static Hashtable parseQueryString(String queryString) { 
		StringTokenizer tokens =  new StringTokenizer(queryString, "&"); 
		Hashtable params = new Hashtable();  
		while (tokens.hasMoreTokens())  { 
			String token = tokens.nextToken(); int equalIdx = token.indexOf('='); 
			if (equalIdx != -1 && !token. equalsIgnoreCase("OpenAgent"))  { 
				String name = token. substring(0, equalIdx); 
				String value = token. substring(equalIdx + 1); 
				params.put(name, value); 
			} 
		} 
		return params; 
	}

    public void NotesMain() {

      try {
          Session session = getSession();
          AgentContext agentContext = session.getAgentContext();

          // Query_String_Decoded
          Document doc = agentContext.getDocumentContext();
          String url =  doc.getItemValueString("Request_content");
          Hashtable ht =  parseQueryString(url);
          String search = (String) ht.get("search");
          search=java.net.URLDecoder.decode(java.net.URLDecoder.decode(search,"utf-8"),"utf-8");
          System.out.println("search-->"+search);
          
          java.io.PrintWriter pw = this.getAgentOutput();
          pw.println("Content-type: application/json;charset=UTF-8");
          String result=HttpSendSoapPost("POST","http://localhost:9200/xpages/_search/",search);
          pw.println(result);
          pw.close();         
          
      } catch(Exception e) {
          e.printStackTrace();
       }
   }
    
    public static String HttpSendSoapPost(String Method,String strurl,String xml){
		HttpURLConnection connection = null;
		InputStream is = null;
		BufferedReader br = null;
		String result = null;// 返回結果字符串
		OutputStream out = null;
		//Date d1 = new Date();
		try {
			// 創建遠程url連接對象
			URL url = new URL(strurl);
			// 通過遠程url連接對象打開一個連接，強轉成httpURLConnection類
			
			connection = (HttpURLConnection) url.openConnection();
			// 設置連接方式：GET,POST
			if(Method.equals("")){
				connection.setRequestMethod("POST");
			}else{
				connection.setRequestMethod(Method);
			}
			connection.setDoInput(true);
			connection.setDoOutput(true);
			connection.setRequestProperty("Content-Type", "application/json");	
						
			// 設置連接主機服務器的超時時間：15000毫秒
			connection.setConnectTimeout(15000);
			// 設置讀取遠程返回的數據時間：60000毫秒
			connection.setReadTimeout(60000);

			// 發送請求
			connection.connect();
			out = connection.getOutputStream(); // 獲取輸出流對象
			connection.getOutputStream().write(xml.getBytes("UTF-8")); // 將要提交服務器的SOAP請求字符流寫入輸出流
			
			out.flush();
			out.close();
			//System.out.println(connection.getResponseCode());
			// 通過connection連接，獲取輸入流
			if (connection.getResponseCode() == 200 || connection.getResponseCode() == 201) {
				is = connection.getInputStream();
				// 封裝輸入流is，並指定字符
				br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
				// 存放數據
				StringBuffer sbf = new StringBuffer();
				String temp = null;
				while ((temp = br.readLine()) != null) {
					sbf.append(temp);
					sbf.append("\r\n");
				}
				result = sbf.toString();
			}
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			// 關閉資源
			if (null != br) {
				try {
					br.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}

			if (null != is) {
				try {
					is.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			connection.disconnect();// 關閉遠程連接
		}
		//System.out.println();
		return result;
	}
    
}