Struts2 generate random Verification code picture

Before want to do a random verification code function, I also searched for someone else to write code, and then re-use the struts2 to achieve a bit, now will I implement code to paste out! Everyone can point out any comments!

The first is the action that generates the random captcha picture:

Createimageaction:

Package Com.xiaoluo.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.servlet.http.httpservletresponse;import Javax.servlet.http.httpsession;import Org.apache.struts2.ServletActionContext; Import Com.opensymphony.xwork2.actionsupport;public class Createimageaction extends actionsupport{private    Bytearrayinputstream InputStream;    private static int WIDTH = 60;    private static int HEIGHT = 20;    Public Bytearrayinputstream getInputStream () {return inputstream;    } public void Setinputstream (Bytearrayinputstream inputstream) {this.inputstream = InputStream; }
    private static string Createrandom () {string str = "0123456789QWERTYUIOPASDFGHJKLZXCVBNM";        char[] Rands = new Char[4];        Random random = new random ();        for (int i = 0; i < 4; i++) {Rands[i] = Str.charat (Random.nextint (36));    } return new String (Rands);        } private void Drawbackground (Graphics g) {//Draw background G.setcolor (new Color (0xDCDCDC));        G.fillrect (0, 0, WIDTH, HEIGHT);            Randomly generates 120 interference points for (int i = 0; i < i++) {int x = (int) (Math.random () * WIDTH);            int y = (int) (Math.random () * HEIGHT);            int red = (int) (Math.random () * 255);            int green = (int) (Math.random () * 255);            int blue = (int) (Math.random () * 255);            G.setcolor (New Color (red, green, blue));        G.drawoval (x, y, 1, 0);        }} private void Drawrands (Graphics g, String rands) {g.setcolor (color.black); G.setfonT (new Font (NULL, Font.Italic |        Font.Bold, 18));        Each character g.drawstring ("" + rands.charat (0), 1, 17) of the output verification code at different heights;        g.DrawString ("" + rands.charat (1), 16, 15);        g.DrawString ("" + Rands.charat (2), 31, 18);        g.DrawString ("" + Rands.charat (3), 46, 16);    System.out.println (Rands); } @Override Public String execute () throws Exception {HttpServletResponse response = Servletactioncontext        . GetResponse ();        Set browser do not cache this picture Response.setheader ("Pragma", "No-cache");        Response.setheader ("Cache-control", "No-cache");        Response.setdateheader ("Expires", 0);        String rands = Createrandom ();        BufferedImage image = New BufferedImage (WIDTH, HEIGHT, Bufferedimage.type_int_rgb);        Graphics g = image.getgraphics ();        Generate Image Drawbackground (g);        Drawrands (g, rands);        End the drawing process of the image and complete the image g.dispose (); Bytearrayoutputstream outputstream = new Bytearrayoutputstream ();        Imageio.write (image, "JPEG", outputstream);        Bytearrayinputstream input = new Bytearrayinputstream (outputstream. Tobytearray ());        This.setinputstream (input);        HttpSession session = Servletactioncontext.getrequest (). GetSession ();                Session.setattribute ("Checkcode", rands);                Input.close ();        Outputstream.close ();    return SUCCESS; }}

The above is the action that generates a random captcha image, the generated random number is placed in the session, and the page is submitted to the action that validates the random number:

Loginvalidateaction:

Package Com.xiaoluo.action;import Javax.servlet.http.httpsession;import Org.apache.struts2.ServletActionContext; Import Com.opensymphony.xwork2.actionsupport;public class Loginvalidateaction extends actionsupport{    private String Checkcode;        Public String Getcheckcode ()    {        return checkcode;    }    public void Setcheckcode (String checkcode)    {        this.checkcode = Checkcode;    }    @Override public    String execute () throws Exception    {        return SUCCESS;    }        @Override public    Void Validate ()    {        HttpSession session = Servletactioncontext.getrequest (). GetSession ();                String checkCode2 = (string) session.getattribute ("Checkcode");                if (!checkcode.equals (checkCode2))        {            this.addactionerror ("Input verification code is not correct, please re-enter!") ");        }    }}

Here is the Struts.xml configuration section code:

<action name= "createimageaction" class= "com.xiaoluo.action.CreateImageAction" >                <result name= "success "Type=" stream ">                    <param name=" ContentType ">image/jpeg</param>                    <param name=" InputName " >inputStream</param>                </result>  </action>                        <action name= "Loginvalidateaction" class= "Com.xiaoluo.action.LoginValidateAction" >                <result name= "Success" >/success.jsp</result>                <result name= "input" >/login.jsp</result>            </action>

The last is the JSP part of the code:

LOGIN.JSP:

<%@ page language= "java" import= "java.util.*" pageencoding= "UTF-8"%><%@ taglib prefix= "s" uri= "/struts-tags" %><%string path = Request.getcontextpath (); String basepath = request.getscheme () + "://" +request.getservername () + ":" +request.getserverport () +path+ "/";%>  　　　　　 
<!--to click on the image to refresh, to get a verification code, to add a random number, so that each commit the past is a different path, to prevent the cache so that the picture is not refreshed--<br> <s:actionerror cssstyle=" color:red "/> <s: Submit Value= "Submissions" ></s:submit> </s:form> </body>
Struts2 generate random Verification code picture