jfreechar_sl.java

JSP移动商品管理平台源代码.........

package imis_hous.servlet;

import imis_elec.UsedByJFree;
import imis_hous.jfree.AssignRoomTongji;
import imis_hous.jfree.JieXiTongJi;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.List;

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

import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.servlet.ServletUtilities;

public class JfreeChar_sl extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public JfreeChar_sl() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		String title = "";
		String y = "";		// y轴标题
		String url = "../imis_hous/jf/display.jsp";

		String xianshi = request.getParameter("xianshi");
		String type = request.getParameter("type");

		AssignRoomTongji assign_tongji = new AssignRoomTongji();
		
		HashMap assignTongjiList = new HashMap();
		if(type.equals("1")) {			// 按数量
			assignTongjiList = assign_tongji.getAssignRoomTongji();
			title = "部门所有房屋数量的比例";
		} else if(type.equals("2")) {		// 按面积
			assignTongjiList = assign_tongji.getAssignRoomTongjiArea();
			title = "部门所有房屋面积的比例";
		}
		
		String filename = "";
		ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
		try {
			if(xianshi.equals("pie")) { 		//面积比例饼图	//500是图片长度，300是图片高度
				filename = ServletUtilities.saveChartAsPNG(AssignRoomTongji.getchart(assignTongjiList,1,title,y), 800, 400, info, request.getSession());
			} else if(xianshi.equals("bar")) {		//柱状图
				filename = ServletUtilities.saveChartAsPNG(AssignRoomTongji.getchart(assignTongjiList,2,title,y), 800, 400, null, request.getSession());
			} 
		} catch (Exception e) {
			e.printStackTrace();
		}
		String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename; 
		
		request.setAttribute("graphURL", graphURL);
		request.getRequestDispatcher(url).forward(request, response);
	}

	public void init() throws ServletException {
		// Put your code here
	}

}