📄 barchart3dservlet.java
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package com.segsec.chart.servlet;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
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.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;
public class BarChart3DServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public BarChart3DServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("image/jpeg");
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(610, "广州", "猪肉");
dataset.addValue(220, "广州", "牛肉");
dataset.addValue(530, "广州", "鸡肉");
dataset.addValue(340, "广州", "鱼肉");
JFreeChart chart = ChartFactory.createBarChart3D("肉类销量统计图","肉类","销量",dataset,PlotOrientation.VERTICAL,false,false,false);
//写图表对象到文件，参照柱状图生成源码
//========================================================
FileOutputStream fos_jpg = null;
try {
fos_jpg = new FileOutputStream("F:\\fruit.jpg");
ChartUtilities.writeChartAsJPEG(fos_jpg,1.0f,chart,400,300,null);
System.out.println("图表生成完毕!");
} finally {
try {
fos_jpg.close();
} catch (Exception e) {}
}
//========================================================
System.out.println("向浏览器端输出图表开始");
ChartUtilities.writeChartAsJPEG(response.getOutputStream(),1.0f, chart, 400,300,null);
System.out.println("向浏览器端输出图表结束");
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the POST method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
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