Struts2 图片验证码

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首先当然要导入各种需要的包和jQuery.js

详情请看我的csdn博客-vipwalkingdog

• Action.RandomImg.java

  package Action;
  
  import java.awt.Color;
  import java.awt.Font;
  import java.awt.Graphics;
  import java.awt.image.BufferedImage;
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.util.Random;
  import javax.imageio.ImageIO;
  import javax.imageio.stream.ImageOutputStream;
  import com.opensymphony.xwork2.ActionContext;
  import com.opensymphony.xwork2.ActionSupport;
  /**
   * Pic validator
   * @author WalkingDog
   *
   */
  public class RandomImg extends ActionSupport
  {
  	private ByteArrayInputStream inputStream;
  	public ByteArrayInputStream getInputStream()
  	{
  		return inputStream;
  	}
  	public void setInputStream(ByteArrayInputStream inputStream)
  	{
  		this.inputStream = inputStream;
  	}
  
  	@Override
  	public String execute() throws Exception
  	{
  		int width = 85, height = 20;
  		BufferedImage image = new  BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
  		Graphics g = image.getGraphics();
  		Random random = new Random();
  		g.setColor(getRandColor(200, 255));
  		g.fillRect(0, 0, width, height);
  		
  		g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
  		g.setColor(getRandColor(160, 200));
  		for(int i = 0; i < 155; i++)
  		{
  			int x1 = random.nextInt(width);
  			int y1 = random.nextInt(height);
  			int x2 = random.nextInt(12);
  			int y2 = random.nextInt(12);
  			g.drawLine(x1, y1, x2, y2);
  		}
  		
  		String sRand = "";
  		for(int i = 0; i < 6; i++)
  		{
  			String rand = getRandomChar();
  			sRand += rand;
  			g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
  			g.drawString(rand, 13*i+6, 16);
  		}
  		ActionContext.getContext().getSession().put("randomImg", sRand.toLowerCase());//存进session,用于验证
  		g.dispose();
  		ByteArrayOutputStream output = new ByteArrayOutputStream();
  		ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);
  		ImageIO.write(image, "JPEG", imageOut);
  		imageOut.close();
  		ByteArrayInputStream input = new ByteArrayInputStream(output.toByteArray());
  		this.setInputStream(input);
  		return SUCCESS;
  		
  	}
  	
  	private Color getRandColor(int fc, int bc)
  	{
  		Random random = new Random();
  		if(fc > 255) fc = 255;
  		if(bc > 255) bc = 255;
  		int r = fc + random.nextInt(bc - fc);
  		int g = fc + random.nextInt(bc - fc);
  		int b = fc + random.nextInt(bc - fc);
  		return new Color(r, g, b);
  	}
  	private static String getRandomChar()
      {
  		  int rand = (int)Math.round(Math.random() * 2);
  		  long itmp = 0;
  		  char ctmp = '\u0000';
  		  switch (rand)
  		  {
  			   case 1:
  				    itmp = Math.round(Math.random() * 25 + 65);
  				    ctmp = (char)itmp;
  				    return String.valueOf(ctmp);
  			   case 2:
  				    itmp = Math.round(Math.random() * 25 + 97);
  				    ctmp = (char)itmp;
  				    return String.valueOf(ctmp);
  			   default :
  				    itmp = Math.round(Math.random() * 9);
  			    
  		  }
  		  return String.valueOf(itmp);
      }
  }

   
• struts.xml

  
  
  
  	
  		
  		
  			
  				image/jpeg
  				inputStream
  			
  		
  
  	
  

   
• randomImg.html

  
  
  
  
  
  
  
  validateCode: