package com.gaojingmin;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.LinkedHashMap;
import java.util.Map;

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

import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.servlet.ServletUtilities;
import org.jfree.data.time.Day;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.time.TimeSeriesDataItem;

public class CurveChartServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public CurveChartServlet() {
		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 {
		this.doPost(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");

        // 曲线图标题
        String title = "趋势分析";
        // 曲线图X轴提示
        String domain = "年份";
        // 曲线图Y轴提示
        String range = "GDP";

        // 创建时间数据源，每一个TimeSeries在图上是一条曲线
        TimeSeries chinaTs = new TimeSeries("中国");
        Map<Integer, Integer> chinaht = new LinkedHashMap<Integer, Integer>();
        chinaht.put(2002, 22100);
        chinaht.put(2003, 14100);
        chinaht.put(2004, 27100);
        chinaht.put(2005, 38100);
        chinaht.put(2006, 29000);
        chinaht.put(2007, 90100);
        
        for (Integer i:chinaht.keySet()) {
            chinaTs.add(new TimeSeriesDataItem(new Day(1, 1, i),new Double(chinaht.get(i))));            
        }

        // 创建时间数据源，每一个TimeSeries在图上是一条曲线
        TimeSeries japanTs = new TimeSeries("日本");
        Map<Integer, Integer> japanht = new LinkedHashMap<Integer, Integer>();
        japanht.put(2000, 43900);
        japanht.put(2003, 63500);
        japanht.put(2004, 43400);
        japanht.put(2005, 63200);
        japanht.put(2006, 53100);
        japanht.put(2007, 32900);
        
        for (Integer i:japanht.keySet()) {
            japanTs.add(new TimeSeriesDataItem(new Day(1, 1, i),new Double(japanht.get(i))));            
        }

        // 创建时间数据源，每一个TimeSeries在图上是一条曲线
        TimeSeries usaTs = new TimeSeries("美国");
        Map<Integer, Integer> usaht = new LinkedHashMap<Integer, Integer>();
        usaht.put(2001, 100000);
        usaht.put(2003, 159800);
        usaht.put(2004, 109700);
        usaht.put(2005, 129600);
        usaht.put(2006, 9800);
        usaht.put(2007, 149800);
        
        for (Integer i:usaht.keySet()) {
            usaTs.add(new TimeSeriesDataItem(new Day(1, 1, i),new Double(usaht.get(i))));            
        }
        
        // 时间曲线数据集合
        TimeSeriesCollection dataset = new TimeSeriesCollection();
        dataset.addSeries(chinaTs);
        dataset.addSeries(japanTs);
        dataset.addSeries(usaTs);

        // 时间曲线元素
        JFreeChart chart = ChartFactory.createTimeSeriesChart(title, domain,
                range, dataset, true, true, false);

        // 创建文件并将图片地址传递到页面
        String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300,
                null, request.getSession());
        String graphURL = request.getContextPath() + "/displayChart?filename="
                + filename;
        request.setAttribute("graphURL", graphURL);

        // 标识
        request.setAttribute("msg", "折线图效果");

        // 页面转向
        RequestDispatcher dispatcher = request
                .getRequestDispatcher("CurveChart.jsp");
        dispatcher.forward(request, response);
        return;


	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}