Struts2图片验证码

1.随机字符生成

package com.future.xdzy.util;public class VerifyCode {    private char getCapitalLetter(){        return (char)((int)(Math.random()*26)+'A');    }    private char getLowercaseLetter(){        return (char)((int)(Math.random()*26)+'a');    }    private char getNumber(){        return (char)((int)(Math.random()*10)+'0');    }    private char getSymbol(){        char[] symbols={'(',')','[',']','{','}','%','@'};        int index=(int)(Math.random()*symbols.length);        return symbols[index];    }    private char getChar(){        int type=(int)(Math.random()*4);        if(type==0){            return getCapitalLetter();        }else if(type==1){            return getLowercaseLetter();        }else if(type==2){            return getNumber();        }else{            return getSymbol();        }    }    public String getVerifyCode(int len){        String code="";        for(int i=0;i<len;i++){            code+=getChar()+"";        }        return code;    }}

2.图片生成

package com.future.xdzy.util;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.io.IOException;import javax.imageio.ImageIO;public class VerifyIamge {    private static ByteArrayOutputStream outputStream;    private static ByteArrayInputStream inputStream;    private static BufferedImage CreatImage(){        String code=new VerifyCode().getVerifyCode(6);        int font_size=15;        int width=font_size*code.length();        int height=font_size*2;        BufferedImage image=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);        Graphics g=image.createGraphics();        //背景        g.setColor(Color.white);        g.fillRect(0, 0, width, height);        //边框        g.setColor(Color.green);        g.drawRect(0, 0, width-1, height-1);        //字符        g.setColor(Color.BLUE);        g.setFont(new Font("微软雅黑",Font.BOLD,font_size));        g.drawString(code, 15, height/2+3);        //噪点        g.setColor(Color.RED);        for(int i=0;i<code.length()*10;i++){            int x=(int)(Math.random()*width);            int y=(int)(Math.random()*height);            g.fillRect(x, y, 1, 1);        }        g.dispose();        return image;    }    public static ByteArrayInputStream getStream() throws IOException{         BufferedImage image=CreatImage();         outputStream=new ByteArrayOutputStream();         ImageIO.write(image, "jpeg", outputStream);         inputStream = new ByteArrayInputStream(outputStream.toByteArray());         return inputStream;    }    public static void closeStream() throws IOException{         inputStream.close();          outputStream.close();    }}

3.Ation调用

package com.future.xdzy.action.util;import java.io.ByteArrayInputStream;import javax.servlet.http.HttpServletResponse;import org.apache.struts2.ServletActionContext;import com.future.xdzy.util.VerifyIamge;import com.opensymphony.xwork2.ActionSupport;public class CreatVerifyImage extends ActionSupport {    private static final long serialVersionUID = 1L;    private ByteArrayInputStream inputStream;    public ByteArrayInputStream getInputStream() {        return inputStream;    }    public void setInputStream(ByteArrayInputStream inputStream) {        this.inputStream = inputStream;    }    @Override    public String execute() throws Exception {        HttpServletResponse response=ServletActionContext.getResponse();        response.setHeader("Pragma", "no-cache");        response.setHeader("Cache-Control", "no-cache");        response.setDateHeader("Expires", 0);        ByteArrayInputStream input=VerifyIamge.getStream();        this.setInputStream(input);        VerifyIamge.closeStream();        return SUCCESS;    }}

4.Action配置

<package name="ActionUtil" namespace="/util" extends="struts-default">    <action name="VerifyImage" class="com.future.xdzy.action.util.CreatVerifyImage">        <result name="success" type="stream">            <param name="contentType">image/jpeg</param>            <param name="inputName">inputStream</param>        </result>    </action></package>

5.页面调用

<img alt="" src="./util/VerifyImage" onclick="this.src='./util/VerifyImage?'+ Math.random()">