用java動態生成圖片驗證碼
阿新 • • 發佈:2019-01-05
package com.klay.image;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.imageio.ImageIO;
public class VerifyCode
{
private int w = 70;
private int h = 35;
private Random r = new Random();
private String[] fontNames =
{ "宋體", "華文楷體", "黑體", "微軟雅黑", "楷體_GB2312" };
// 可選的字元
private String codes = "23456789abcdefghijkmnopqrstuvwxyzABCDEFGHIGKMNOPQRSTUVWXYZ";
// 背景色
private Color bgColor = new Color(255, 255, 255);
private String text;
// 返回背景顏色,150儘量不靠近白色
private Color randomColor()
{
int red = r.nextInt(150);
int green = r.nextInt(150);
int blue = r.nextInt(150);
return new Color(red, blue, green);
}
// 返回隨機字型,
private Font randomFont()
{
int index = r.nextInt(fontNames.length);
String fontName = fontNames[index];
int style = r.nextInt(4);// 生成隨機的樣式 加粗 傾斜
int size = r.nextInt(5) + 24;
return new Font(fontName, style, size);
}
// 擾亂橫線
private void drawLine(BufferedImage image)
{
int num = 3;
Graphics2D g2 = (Graphics2D) image.getGraphics();
for (int i = 0; i < num; i++)
{
int x1 = r.nextInt(w);
int y1 = r.nextInt(h);
int x2 = r.nextInt(w);
int y2 = r.nextInt(h);
g2.setStroke(new BasicStroke(1.5F));
g2.setColor(Color.BLUE);
g2.drawLine(x1, y1, x2, y2);
}
}
private char randomChar()
{
int index = r.nextInt(codes.length());
return codes.charAt(index);
}
//建立圖片緩衝區,並得到空白圖片
private BufferedImage createImage()
{
BufferedImage image = new BufferedImage(w, h,
BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = (Graphics2D) image.getGraphics();
g2.setColor(this.bgColor);
g2.fillRect(0, 0, w, h);
return image;
}
// 得到驗證碼圖片
public BufferedImage getImage()
{
BufferedImage image = new BufferedImage(w, h,
BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = (Graphics2D) image.getGraphics();
// 用來裝載生成的驗證碼文字
StringBuilder sb = new StringBuilder();
// 向圖片中畫4個字元
for (int i = 0; i < 4; i++)
{
String s = randomChar() + "";
sb.append(s);
float x = i * 1.0F * w / 4;//將4個字元分開顯示
g2.setFont(randomFont());
g2.setColor(randomColor());
g2.drawString(s, x, h - 5);//4個字元的位置
}
this.text = sb.toString();
drawLine(image);
return image;
}
// 得到驗證碼的文字內容
public String getText()
{
return text;
}
// 儲存圖片到指定的輸出流
public static void output(BufferedImage image, OutputStream out)
throws IOException
{
ImageIO.write(image, "JEPG", out);
}
}
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.imageio.ImageIO;
public class VerifyCode
{
private int w = 70;
private int h = 35;
private Random r = new Random();
private String[] fontNames =
{ "宋體", "華文楷體", "黑體", "微軟雅黑", "楷體_GB2312" };
// 可選的字元
private String codes = "23456789abcdefghijkmnopqrstuvwxyzABCDEFGHIGKMNOPQRSTUVWXYZ";
// 背景色
private Color bgColor = new Color(255, 255, 255);
private String text;
// 返回背景顏色,150儘量不靠近白色
private Color randomColor()
{
int red = r.nextInt(150);
int green = r.nextInt(150);
int blue = r.nextInt(150);
return new Color(red, blue, green);
}
// 返回隨機字型,
private Font randomFont()
{
int index = r.nextInt(fontNames.length);
String fontName = fontNames[index];
int style = r.nextInt(4);// 生成隨機的樣式 加粗 傾斜
int size = r.nextInt(5) + 24;
return new Font(fontName, style, size);
}
// 擾亂橫線
private void drawLine(BufferedImage image)
{
int num = 3;
Graphics2D g2 = (Graphics2D) image.getGraphics();
for (int i = 0; i < num; i++)
{
int x1 = r.nextInt(w);
int y1 = r.nextInt(h);
int x2 = r.nextInt(w);
int y2 = r.nextInt(h);
g2.setStroke(new BasicStroke(1.5F));
g2.setColor(Color.BLUE);
g2.drawLine(x1, y1, x2, y2);
}
}
private char randomChar()
{
int index = r.nextInt(codes.length());
return codes.charAt(index);
}
//建立圖片緩衝區,並得到空白圖片
private BufferedImage createImage()
{
BufferedImage image = new BufferedImage(w, h,
BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = (Graphics2D) image.getGraphics();
g2.setColor(this.bgColor);
g2.fillRect(0, 0, w, h);
return image;
}
// 得到驗證碼圖片
public BufferedImage getImage()
{
BufferedImage image = new BufferedImage(w, h,
BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = (Graphics2D) image.getGraphics();
// 用來裝載生成的驗證碼文字
StringBuilder sb = new StringBuilder();
// 向圖片中畫4個字元
for (int i = 0; i < 4; i++)
{
String s = randomChar() + "";
sb.append(s);
float x = i * 1.0F * w / 4;//將4個字元分開顯示
g2.setFont(randomFont());
g2.setColor(randomColor());
g2.drawString(s, x, h - 5);//4個字元的位置
}
this.text = sb.toString();
drawLine(image);
return image;
}
// 得到驗證碼的文字內容
public String getText()
{
return text;
}
// 儲存圖片到指定的輸出流
public static void output(BufferedImage image, OutputStream out)
throws IOException
{
ImageIO.write(image, "JEPG", out);
}
}