动态Web项目在浏览器上显示java代码？

Question

I am creating Dynamic web project in eclipse. Now Following is my java class

package com;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.util.LinkedHashMap;
import java.util.Map;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class FirstProject extends JPanel {
    private Map<Color, Integer> bars = new LinkedHashMap<Color, Integer>();

    /**
     * Add new bar to chart
     * 
     * @param color
     *            color to display bar
     * @param value
     *            size of bar
     */
    public void addBar(Color color, int value) {
        bars.put(color, value);
        repaint();
    }

    protected void paintComponent(Graphics g) {

        int max = Integer.MIN_VALUE;
        for (Integer value : bars.values()) {
            max = Math.max(max, value);
        }

        int width = (getWidth() / bars.size()) - 2;
        int x = 1;
        for (Color color : bars.keySet()) {
            int value = bars.get(color);
            int height = (int) ((getHeight() - 5) * ((double) value / max));
            g.setColor(color);
            g.fillRect(x, getHeight() - height, width, height);
            g.setColor(Color.black);
            g.drawRect(x, getHeight() - height, width, height);
            x += (width + 2);
        }
    }

    public Dimension getPreferredSize() {
        return new Dimension(bars.size() * 10 + 2, 50);
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Bar Chart");
        FirstProject chart = new FirstProject();
        chart.addBar(Color.red, 100);
        chart.addBar(Color.green, 8);
        chart.addBar(Color.blue, 54);
        chart.addBar(Color.black, 23);
        frame.getContentPane().add(chart);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }
}

and following is my web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>com.FirstProject</display-name>
  <welcome-file-list>
    <welcome-file>com.FirstProject</welcome-file>

  </welcome-file-list>
</web-app>.

Now when I run the application the local host displays the entire code as it is on the browser.

How to get the desired output(the bar chart being displayed on browser)? Am I missing something or am I not following the correct pattern?

Answer 1

If you want to display your output,Then you have to use the JSP, Servlet, NOT a JPANEL. JPanel cannot display data into browser.

You can use the JApplet and the display the code into browser.

You got my point?

Answer 2

I think this not the solution to your question, but this may help you to solve your problem.

Striking Difference between Swing and JSP+Servlets

JSP,Servlets : They are server-side technology, used for generating HTML pages

Swing used for desktop applications (can be used with JApplets)

Answer 3

您正在使用JPanel .. JPanel是为桌面应用程序开发的。您必须使用Jsp或servlet在基于Web的应用程序中工作..您必须使用Html标签在Web浏览器中显示您的设计..

Answer 4

As everyone has specified swing is desktop app and Jframe cant be used in web application.

You can show only static image on web browser using jfreechart.

IN desktop app using swing u can customize the charts for mouselistner,keyboard listner, tool tips and all....

Jsp can show only static image file.

Answer 5

使用JavaFX显示网页。