Struts 2 生成验证码

每篇一囧：有些事情，不是因为难以做到而失去信心，而是因为失去信心才变得难以做到。

0.用Struts 2 生成验证码

  

======================  华丽丽的分割线  ======================

  

0.用Struts 2 生成验证码

   

第一步，定义一个生成验证码的工具类：

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;      
  
public class RandomNumUtil {   
  
    private ByteArrayInputStream image;//图像       
    private String str;//验证码       
         
    private RandomNumUtil(){       
    init();//初始化属性       
    }       
    /*     
     * 取得RandomNumUtil实例     
     */       
    public static RandomNumUtil Instance(){       
    return new RandomNumUtil();       
    }       
    /*     
     * 取得验证码图片     
     */       
    public ByteArrayInputStream getImage(){       
    return this.image;       
    }       
    /*     
     * 取得图片的验证码     
     */       
    public String getString(){       
    return this.str;       
    }       
         
    private void init() {       
    // 在内存中创建图象       
    int width=85, height=20;       
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);       
    // 获取图形上下文       
    Graphics g = image.getGraphics();       
    // 生成随机类       
    Random random = new Random();       
    // 设定背景色       
    g.setColor(getRandColor(200,250));       
    g.fillRect(0, 0, width, height);       
    // 设定字体       
    g.setFont(new Font("Times New Roman",Font.PLAIN,18));       
    // 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到       
    g.setColor(getRandColor(160,200));       
    for (int i=0;i<155;i++) {       
        int x = random.nextInt(width);       
        int y = random.nextInt(height);       
        int xl = random.nextInt(12);       
        int yl = random.nextInt(12);       
        g.drawLine(x,y,x+xl,y+yl);       
    }       
    // 取随机产生的认证码(6位数字)       
    String sRand="";       
    for (int i=0;i<6;i++){       
        String rand=String.valueOf(random.nextInt(10));       
        sRand+=rand;       
        // 将认证码显示到图象中       
        g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));       
        // 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成       
        g.drawString(rand,13*i+6,16);       
    }      
    //赋值验证码      
    this.str=sRand;       
         
    //图象生效       
    g.dispose();       
    ByteArrayInputStream input=null;       
    ByteArrayOutputStream output = new ByteArrayOutputStream();       
    try{       
        ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);       
        ImageIO.write(image, "JPEG", imageOut);       
        imageOut.close();       
        input = new ByteArrayInputStream(output.toByteArray());       
    }catch(Exception e){       
        System.out.println("验证码图片产生出现错误："+e.toString());       
    }       
         
    this.image=input;/* 赋值图像 */       
    }       
   /*     
    * 给定范围获得随机颜色     
    */       
    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);       
    }      
}  

 

第二步，定义一个验证码输出的action

import java.io.ByteArrayInputStream;   
import java.io.ByteArrayOutputStream;   
  
import org.springframework.context.annotation.Scope;   
import org.springframework.stereotype.Controller;   
  
import com.cn.hospital.util.RandomCharUtil;   
import com.cn.hospital.util.RandomNumUtil;   
import com.opensymphony.xwork2.ActionContext;   
import com.opensymphony.xwork2.ActionSupport;   
  
@ Controller("utilAction")

@Scop e("prototype")

public class UtilAction extends ActionSupport{   
       
    private static final long serialVersionUID = -7193209177116825032L;   
    private ByteArrayInputStream inputStream;    
       
    private int width;      
    private int height;      
    private int fontSize;      
    private int codeLength;    
    private int disturbType;   
       
    public String validNumGenerate() throws Exception{   
        RandomNumUtil rdnu=RandomNumUtil.Instance();       
        this.setInputStream(rdnu.getImage());//取得带有随机字符串的图片       
        ActionContext.getContext().getSession().put("random", rdnu.getString());//取得随机字符串放入HttpSession       
        return SUCCESS;       
    }    
       
       
    public void setInputStream(ByteArrayInputStream inputStream) {       
        this.inputStream = inputStream;       
    }      
       
    public ByteArrayInputStream getInputStream() {       
        return inputStream;       
    }   
        
}  

 

第三步，配置 struts.xml

   
        <!-- 产生随机验证码 -->   
        <action name="randNum" class="utilAction" method="validNumGenerate">         
           <result name="success" type="stream">         
                <param name="contentType">image/jpeg</param>         
                <param name="inputName">inputStream</param>         
           </result>      
        </action>