Jsp web page login verification, jsp web page Verification

Jsp web page login verification, jsp web page Verification

Jsp login verification, webpage login verification with verification code, login function to add Verification Code

Part_1:VerificationCode. java

Package cn. mike. javase. test; import java. awt. color; import java. awt. font; import java. awt. graphics2D; import java. awt. image. bufferedImage; import java. io. file; import java. io. fileNotFoundException; import java. io. fileOutputStream; import java. io. IOException; import java. io. outputStream; import java. util. random; import javax. imageio. imageIO; import org. junit. test;/*** @ author: Administrator * @ fu Nction: This is the class used to test the randomly generated Verification Code image; */public class VerificationCode {/*** unit test, try to automatically generate a verification code image * // this function is used for unit testing. Here, it cannot be called outside the private domain; /* @ Test * // * public */private void test_fun () {VerificationCode vc = new VerificationCode (); BufferedImage image = vc. getImage (); try {// generate the verification code image and save it to the specified path VerificationCode. output (image, new FileOutputStream (new File (". \ image \ vcode_2.jpg ");} catch (FileNotFou NdException e) {e. printStackTrace ();} // outputs randomly generated text content to the console for System verification. out. println (vc. getText ();} private int w = 70; // wide private int h = 35; // high private String text; // text content (Verification code String) private Random r = new Random (); private String [] fontNames = {"", "文 ", ""," ", "_ GB2312"}; // random character sets do not include 0, o, 1, and l, because these cannot distinguish private String codes = "23456789 abcdefghijkmnopqrstuvwxyzabcdefghilmjknopqrs TUVWXYXZ "; // background Color of the Verification Code image: White private Color bgColor = new Color (255,255,255);/*** return a verification code image buffer object: BufferedImage */public BufferedImage getImage () {BufferedImage image = createImage (); // obtain the drawing environment (paint brush tool) Graphics2D g2 = (Graphics2D) image. getGraphics (); // sb: used to save the text content of the verification code string StringBuilder sb = new StringBuilder (); for (int I = 0; I <4; ++ I) {// Four Characters String s = randomChar () + ""; sb. append (s ); Float x = I * 1.0F * w/4; g2.setFont (randomFont (); g2.setColor (randomColor (); g2.drawString (s, x, h-5 );} this. text = sb. toString (); // record the text content of the Verification Code drawLine (image); // draw the interference line return image ;} /*** @ return get verification code text content */public String getText () {return text ;} /*** @ param image * @ param out * writes the text to the specified output stream. For example, the storage path */public static void output (BufferedImage image, OutputStream out) specified by FileOutputStream in this test {try {ImageIO. write (image, "jpeg", out);} catch (IOException e) {e. printStackTrace () ;}} private void drawLine (BufferedImage image) {Graphics2D g2 = (Graphics2D) image. getGraphics (); for (int I = 0; I <3; ++ I) {// draw 3 interference lines int x1 = r. nextInt (w); int y1 = r. nextInt (h); int x2 = r. nextInt (w); int y2 = r. nextInt (h); g2.setColor (Color. BLUE); g2.drawLine (x1, y1, x2, y2) ;}} private Color randomColor () {int red = r. nextInt (150); int green = r. nextInt (150); int blue = r. nextInt (150); return new Color (red, green, blue);} private Font randomFont () {int index = r. nextInt (fontNames. length); String fontName = fontNames [index]; int style = r. nextInt (4); int size = r. nextInt (5) + 24; return new Font (fontName, style, size);} private char randomChar () {int index = r. nextInt (codes. length (); return codes. charAt (index);} 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 ;}}

Part_2:Logon interface: Login. jsp

<% @ Page language = "java" import = "java. util. * "pageEncoding =" UTF-8 "%> <% String path = request. getContextPath (); String basePath = request. getScheme () + ": //" + request. getServerName () + ":" + request. getServerPort () + path + "/"; %> <! Doctype html public "-// W3C // dtd html 4.01 Transitional // EN"> 
Part_3:Servlet for processing login verification: LoginVerificationServlet. java

Package cn. mike. servlet. test_1212; import java. awt. image. bufferedImage; import java. io. IOException; import javax. servlet. servletException; import javax. servlet. http. httpServlet; import javax. servlet. http. httpServletRequest; import javax. servlet. http. httpServletResponse; import cn. mike. javase. test. verificationCode; public class GetVerificationCodeServlet extends HttpServlet {private static final long serialVersionUID =-response; public void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// 1. create a VerificationCode class; VerificationCode vc = new VerificationCode (); // 2. obtain the BufferedImage object from the VerificationCode class; BufferedImage bufImage = vc. getImage (); // 3. obtain the text content in the verification code and put it in the session domain for verification. String code_text = vc. getText (); request. getSession (). setAttribute ("code_text", code_text); // 4. output the generated image to the client browser VerificationCode. output (bufImage, response. getOutputStream ();} // end method-doGet public void doPost (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// do same as GET-method: doGet (request, request, response);} // end method-doPost}
Part_4:Prompt page after login successful 1: success-page-1.jsp

<% @ Page language = "java" import = "java. util. * "pageEncoding =" UTF-8 "%> <% String path = request. getContextPath (); String basePath = request. getScheme () + ": //" + request. getServerName () + ":" + request. getServerPort () + path + "/"; %> <! Doctype html public "-// W3C // dtd html 4.01 Transitional // EN"> 
Part_5:Prompt page after login successful 1: success-page-2.jsp

<% @ Page language = "java" import = "java. util. date "pageEncoding =" UTF-8 "%> <% @ page language =" java "import =" java. text. simpleDateFormat "%> <% String path = request. getContextPath (); String basePath = request. getScheme () + ": //" + request. getServerName () + ":" + request. getServerPort () + path + "/"; %> <! Doctype html public "-// W3C // dtd html 4.01 Transitional // EN"> 
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