echarts实时更新动态折线图

package com.jlrfid.servlet; import java.io.IOException; import java.io.PrintWriter; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import net.sf.json.JSONArray; import net.sf.json.JSONException; import org.json.JSONObject; import com.jlrfid.entity.TagRecord; import com.jlrfid.service.TagRecordService; import com.jlrfid.service.impl.TagRecordServiceImpl; public class DoQueryData extends HttpServlet { private static final long serialVersionUID = 1L; public void destroy() { super.destroy(); // Just puts "destroy" string in log } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setCharacterEncoding("UTF-8"); TagRecordService tagRecord = new TagRecordServiceImpl(); List<TagRecord> list = tagRecord.queryList(addOneSecond(new Date())); //创建json集合 JSONArray jsonArray = JSONArray.fromObject(list); // json在这里存放的是数组信息 JSONObject json = new JSONObject(); try { // 添加到json中 //json.put("cardNo", jsonArray); } catch (JSONException e) { e.printStackTrace(); } // 向前台的页面输出结果 PrintWriter out = response.getWriter(); out.println(jsonArray); out.close(); } public String[] addOneSecond(Date date) { SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String[] dates = new String[2]; Calendar calendar = Calendar.getInstance(); calendar.setTime(date); calendar.add(Calendar.SECOND, 2); dates[0] = sf.format(date); dates[1] = sf.format(calendar.getTime()); return dates; } }