layerservlet.java

java+mapxtreme 开发校园房管系统

package com.oyc.mapxtreme.servlet;

import java.io.IOException;
import java.util.Iterator;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.mapinfo.mapj.FeatureLayer;
import com.mapinfo.mapj.LayerType;
import com.mapinfo.mapj.Layers;
import com.mapinfo.mapj.MapJ;
import com.oyc.mapxtreme.util.RenderMap;

/**
 * 图层servlet,控制图层的显示
 * @author 三峡大学理学院 欧阳超
 *
 */
public class LayerServlet extends BaseHttpServlet {
	
	/**
	 * 显示所有图层
	 * 
	 */
	public void showLayer(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		//取出地图对象
		HttpSession session = request.getSession();
		MapJ myMap = (MapJ) session.getAttribute("mapj");
		
		//取出图层对象并放入request
		Layers layers = myMap.getLayers();
		request.removeAttribute("layers");
		request.setAttribute("layers", layers);
		
		super.forward("layer.jsp", request, response);
	}
	
	/**
	 * 更改图层的状态
	 * 
	 */
	public void changeLayer(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		//取出地图对象
		HttpSession session = request.getSession();
		MapJ myMap = (MapJ) session.getAttribute("mapj");
		
		//遍历图层,更改图层状态
		Layers layers = myMap.getLayers();
		String isView = null;
		String isSelect = null;
		String isLabel = null;
		
		FeatureLayer layer = null;
		int i = 0;
		for(Iterator iter=layers.iterator(LayerType.ALL); iter.hasNext(); ){
			layer = (FeatureLayer) iter.next();
			
			isView = request.getParameter("isView" + i);
			isSelect = request.getParameter("isSelect" + i);
			isLabel = request.getParameter("isLabel" + i);
			
			//是否可见
			if(isView != null && isView.equals("true")){
				layer.setEnabled(true);
			}else{
				layer.setEnabled(false);
			}
			//是否可选择
			if(isSelect != null && isSelect.equals("true")){
				layer.setSelectable(true);
			}else{
				layer.setSelectable(false);
			}
			//是否标注
			if(isLabel != null && isLabel.equals("true")){
				layer.setAutoLabel(true);
			}else{
				layer.setAutoLabel(false);
			}
			i++;
		}
		
		//渲染地图对象
		try {
			RenderMap render = new RenderMap();
			render.renderMap(myMap, response);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}