Java实战之用Spring开发条形码和验证码

一、条形码

代码如下：

import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;

public class Text extends JFrame {
    private static final int WIDTH=300;//窗口的宽度
    private static final int HEIGHT=400;//窗口的高度
    private static final int LINES=120;//内部的线条数量
    private static final int SPACE=10;//线条与线条之间的间距
    private static JFrame jFrame=null;

    public static void main(String[] args) {
        initialize();
    }

    private static void initialize(){//初始化窗口
        jFrame=new JFrame("条形码");
        jFrame.setSize(WIDTH,HEIGHT);
        jFrame.setLayout(null);
        JLabel jLabel=new JLabel();
        jLabel.setBounds(0,0,WIDTH,80);
        jLabel.setIcon(new ImageIcon(setCode()));
        jFrame.add(jLabel);
        jFrame.setVisible(true);
        jFrame.setLocationRelativeTo(null);
        jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    private static BufferedImage setCode() {
        Random random = new Random();
        BufferedImage bufferedImage = new BufferedImage(WIDTH, 80, BufferedImage.TYPE_INT_RGB);//创建一个图片画板
        Graphics g = bufferedImage.getGraphics();//得到画笔
        g.setColor(Color.white);//设置画笔颜色
        g.fillRect(0, 0, WIDTH, 80);//规定画笔的一个范围
        g.setColor(Color.black);//这个是设置线条的颜色
        for(int i=0;i<LINES;i++){
            int row=random.nextInt(WIDTH)+SPACE;
            g.drawLine(row,0,row,HEIGHT);
        }
        return bufferedImage;
    }
}

效果如下：

二、验证码

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.util.Random;

public class Text extends JFrame{
    private final static char[] words=("1234567890" +
            "abcdefghijklmnopqrstuvwxyz" +
            "ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();

    private final static int WORDLENGTH=4;
    private final static int WIDTH=200;
    private final static int HEIGHT=100;
    private final static int STAR=200;
    private static Text t=null;
    private static TextField textFile=null;
    private static Object[] obj=null;

    private static Object[] drawCode(){
        BufferedImage bufferedImage=new BufferedImage(WIDTH,HEIGHT,BufferedImage.TYPE_INT_RGB);
        Graphics g=bufferedImage.getGraphics();
        char[] selectWord=new char[4];
        g.setColor(Color.LIGHT_GRAY);
        g.fillRect(0,0,WIDTH,HEIGHT);
        Random random=new Random();
        for(int i=0;i<WORDLENGTH;i++){
            int n=random.nextInt(words.length);
            selectWord[i]=words[i];
            g.setFont(new Font("微软雅黑",0,random.nextInt(20)+40));
            g.setColor(setRandomColor());
            g.drawString(words[n]+"",i*WIDTH/WORDLENGTH,HEIGHT/2+10);
        }
        for(int i=0;i<STAR;i++){
            g.setColor(setRandomColor());
            g.setFont(new Font("楷书",0,40));
            g.drawOval(random.nextInt(WIDTH),random.nextInt(HEIGHT),3, 3);
        }
        return new Object[]{selectWord,bufferedImage};
    }

    private static Color setRandomColor(){
        Random colorRandom=new Random();
        return new Color(colorRandom.nextInt(256),colorRandom.nextInt(256),colorRandom.nextInt(256));
    }

    public static void main(String[] args) {
        t=new Text();
        t.setLocationRelativeTo(null);
        t.setSize(WIDTH,200);
        t.setLayout(null);
        t.add(setLabel());
        t.add(setButton());
        t.add(setTextField());
        t.setVisible(true);
        t.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    private static JLabel setLabel(){
        JLabel jLabel=new JLabel();
        obj=drawCode();
        jLabel.setIcon(new ImageIcon((BufferedImage)obj[1]));
        jLabel.setBounds(0,0,WIDTH,HEIGHT);
        jLabel.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                jLabel.setIcon(new ImageIcon((BufferedImage)drawCode()[1]));
            }
        });
        return jLabel;
    }

    private static TextField setTextField(){
        textFile=new TextField();
        textFile.setFont(new Font("华文行楷",0,20));
        textFile.setBounds(5,120, 100,30);
        return textFile;
    }

    private static JButton setButton(){
        JButton jButton=new JButton("检测");
        jButton.setBounds(110,120, 70,30);
        jButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                System.out.println(textFile.getText().equals(obj[0]));
            }
        });
        return jButton;
    }
}

效果如下：
验证码这里是因为没有设置好字符编码的原因，让中文字符无法在窗口内不显示

验证码就比条形码难以点点，但是基本的编写思想都是差不多的，
但最难的还是在二维码上，编写二维码就需要要求编写者的算法能力足够的扎实，而且还要有足够丰富的Java功底

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