我正在 Eclipse 中创建动态 web 项目。现在以下是我的java类
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);
}
}
以下是我的 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>.
现在,当我运行应用程序时,本地主机会显示浏览器上的整个代码。
如何获得所需的输出(在浏览器上显示的条形图)?我错过了什么还是我没有遵循正确的模式?