/* 
 * To change this template, choose Tools | Templates 
 * and open the template in the editor. 
 */  
package com.test1;  
  
import java.awt.Font;  
import java.io.IOException;  
import java.io.OutputStream;  
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.ChartUtilities;  
import org.jfree.chart.JFreeChart;  
import org.jfree.chart.axis.CategoryAxis;  
import org.jfree.chart.axis.NumberAxis;  
import org.jfree.chart.plot.CategoryPlot;  
import org.jfree.chart.plot.PlotOrientation;  
import org.jfree.data.category.CategoryDataset;  
import org.jfree.data.category.DefaultCategoryDataset;  
  
/** 
 * 
 * @author Administrator 
 */  
public class BarChartServlet extends HttpServlet {  
  
    @Override  
    protected void doGet(HttpServletRequest request, HttpServletResponse response)  
            throws ServletException, IOException {  
  
        response.setContentType("image/jpeg");  
        OutputStream out = response.getOutputStream();  
  
        CategoryDataset ds = getDataSet();  
        JFreeChart chart = ChartFactory.createBarChart3D(  
                "单站日降雨量", //图表标题  
                "", //X轴的显示标签  
                "降雨量(mm)", //Y轴的显示标签  
                ds, //数据集  
                PlotOrientation.VERTICAL, //图表方向  
                true, //是否显示图例，对于简单的柱状图必须为false  
                false, //是否生成提示工具  
                false);         //是否生成url链接  
  
        CategoryPlot categoryplot = (CategoryPlot) chart.getPlot();  
  
        NumberAxis numberaxis = (NumberAxis) categoryplot.getRangeAxis();  
  
        CategoryAxis domainAxis = categoryplot.getDomainAxis();  
  
        /*------设置X轴坐标上的文字-----------*/  
        domainAxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 11));  
  
        /*------设置X轴的标题文字------------*/  
        domainAxis.setLabelFont(new Font("宋体", Font.PLAIN, 12));  
  
        /*------设置Y轴坐标上的文字-----------*/  
        numberaxis.setTickLabelFont(new Font("sans-serif", Font.PLAIN, 12));  
  
        /*------设置Y轴的标题文字------------*/  
        numberaxis.setLabelFont(new Font("黑体", Font.PLAIN, 12));  
  
        /*------这句代码解决了底部汉字乱码的问题-----------*/  
        chart.getLegend().setItemFont(new Font("宋体", Font.PLAIN, 12));  
  
        /*******这句代码解决了标题汉字乱码的问题********/  
        chart.getTitle().setFont(new Font("宋体", Font.PLAIN, 12));  
  
        try {  
            ChartUtilities.writeChartAsJPEG(out, 0.5f, chart, 1200, 800, null);  
        } finally {  
            try {  
                out.close();  
            } catch (Exception ex) {  
                ex.printStackTrace();  
            }  
        }  
    }  
  
    @Override  
    protected void doPost(HttpServletRequest request, HttpServletResponse response)  
            throws ServletException,  
            IOException {  
        doGet(request, response);  
    }  
  
    private CategoryDataset getDataSet() {  
        DefaultCategoryDataset ds = new DefaultCategoryDataset();  
        ds.addValue(80, "", "2月21日");  
        ds.addValue(100, "", "2月22日");
        ds.addValue(60, "", "2月23日"); 
        ds.addValue(110, "", "2月24日");
        ds.addValue(90, "", "2月25日");
        ds.addValue(120, "", "2月26日"); 
        ds.addValue(50, "", "2月27日");
        ds.addValue(70, "", "2月28日"); 
        ds.addValue(80, "", "3月1日");
        ds.addValue(40, "", "3月2日");
        ds.addValue(60, "", "3月3日"); 
        ds.addValue(90, "", "3月4日");
        ds.addValue(500, "", "3月5日");
        ds.addValue(500, "", "3月6日");
        ds.addValue(500, "", "3月7日");
        return ds;  
    }  
}