import?javax.imageio.ImageIO;
import?javax.servlet.ServletException;
import?javax.servlet.annotation.WebServlet;
import?javax.servlet.http.HttpServlet;
import?javax.servlet.http.HttpServletRequest;
import?javax.servlet.http.HttpServletResponse;
import?javax.servlet.http.HttpSession;
import?java.awt.*;
import?java.awt.image.BufferedImage;
import?java.io.IOException;
import?java.util.Random;

/**
?*?Created?by?HE?on?2016/9/18.
?*/
@WebServlet（name?=?“AuthCode“）
public?class?AuthCode?extends?HttpServlet?{
????private?static?final?int?WIDTH?=?60;//設置驗證碼圖片寬度
????private?static?final?int?HEIGHT?=?20;//設置驗證碼圖片高度
????private?static?final?int?LENGTH?=?4;//設置驗證碼長度
????//設置驗證碼隨機出現的字符
????private?static?final?String?str?=?“1234567890“?+
????????????“abcdefghijklmnopqrstuvwxyz“?+
????????????“ABCDEFGHIJKLMNOPQRSTUVWXYZ“;
????char[]?chars?=?str.toCharArray（）;//將字符放在數組中方便隨機讀取
????private?static?Random?random?=?new?Random（）;

????protected?void?doGet（HttpServletRequest?request?HttpServletResponse?response）?throws?ServletException?IOException?{

????????//設置輸出的類型為圖片
????????response.setContentType（“image/jpeg“）;

????????//設置不進行緩存
????????response.setHeader（“pragma“?“no-cache“）;
????????response.setHeader（“cache-control“?“no-cache“）;
????????response.setHeader（“expires“?“0“）;

????????BufferedImage?image?=?new?BufferedImage（WIDTH?HEIGHT?BufferedImage.TYPE_3BYTE_BGR）;

????????//畫筆
????????Graphics?graphics?=?image.getGraphics（）;

????????//設置背景顏色并繪制矩形背景
????????graphics.setColor（Color.WHITE）;
????????graphics.fillRect（0?0?WIDTH?HEIGHT）;

????????//用于記錄生成的驗證碼
????????String?code?=?null;

????????//生成驗證碼并繪制
????????for?（int?i?=?0;?i?????????????String?c?=?““?+?chars[random.nextInt（str.length（））];
????????????graphics.setColor（getColor（））;
????????????graphics.drawString（c?10?*?i?+?10?18）;
????????????code?+=?c;
????????}

????????//生成干擾點
????????for?（int?i?=?0;?i?????????????graphics.setColor（getColor（））;
????????????graphics.drawOval（random.nextInt（60）?random.nextInt（20）?1?1）;
????????}

????????//將生成的驗證碼存入session中，以便進行校驗
????????HttpSession?session?=?request.getSession（）;
????????session.setAttribute（“code“?code）;

????????//繪制圖片
????????graphics.dispose（）;

????????//將圖片輸出到response中
????????ImageIO.write（image?“JPEG“?response.getOutputStream（））;
????}

????//隨機生成顏色
????private?Color?getColor（）?{
????????return?new?Color（random.nextInt（255）?random.nextInt（255）?random.nextInt（255））;
????}
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2016-09-18?20:17??AuthCode\
?????文件?????????335??2016-09-18?20:17??AuthCode\.classpath
?????目錄???????????0??2016-09-18?20:17??AuthCode\.idea\
?????目錄???????????0??2016-09-18?18:56??AuthCode\.idea\artifacts\
?????文件?????????507??2016-09-18?18:56??AuthCode\.idea\artifacts\AuthCode_war_exploded.xml
?????文件?????????686??2016-09-18?18:56??AuthCode\.idea\compiler.xml
?????目錄???????????0??2016-09-18?18:56??AuthCode\.idea\copyright\
?????文件??????????76??2016-09-18?18:56??AuthCode\.idea\copyright\profiles_settings.xml
?????文件?????????159??2016-09-18?18:56??AuthCode\.idea\encodings.xml
?????文件????????1161??2016-09-18?20:01??AuthCode\.idea\misc.xml
?????文件?????????256??2016-09-18?18:56??AuthCode\.idea\modules.xml
?????文件???????53844??2016-09-18?20:17??AuthCode\.idea\workspace.xml
?????文件?????????346??2016-09-18?20:17??AuthCode\.project
?????文件?????????385??2016-09-18?20:17??AuthCode\AuthCode.eml
?????文件?????????917??2016-09-18?18:56??AuthCode\AuthCode.iml
?????文件??????????66??2016-09-18?20:17??AuthCode\AuthCode.userlibraries
?????目錄???????????0??2016-09-18?19:23??AuthCode\out\
?????目錄???????????0??2016-09-18?18:59??AuthCode\out\artifacts\
?????目錄???????????0??2016-09-18?20:02??AuthCode\out\artifacts\AuthCode_war_exploded\
?????目錄???????????0??2016-09-18?19:32??AuthCode\out\artifacts\AuthCode_war_exploded\img\
?????文件????????2123??2016-09-18?19:32??AuthCode\out\artifacts\AuthCode_war_exploded\img\g.png
?????文件????????1566??2016-09-18?19:32??AuthCode\out\artifacts\AuthCode_war_exploded\img\h.png
?????文件?????????551??2016-09-18?20:02??AuthCode\out\artifacts\AuthCode_war_exploded\index.jsp
?????目錄???????????0??2016-09-18?19:34??AuthCode\out\artifacts\AuthCode_war_exploded\WEB-INF\
?????目錄???????????0??2016-09-18?20:09??AuthCode\out\artifacts\AuthCode_war_exploded\WEB-INF\classes\
?????文件????????3181??2016-09-18?20:09??AuthCode\out\artifacts\AuthCode_war_exploded\WEB-INF\classes\AuthCode.class
?????文件?????????812??2016-09-18?19:34??AuthCode\out\artifacts\AuthCode_war_exploded\WEB-INF\classes\Servlet.class
?????文件?????????559??2016-09-18?19:34??AuthCode\out\artifacts\AuthCode_war_exploded\WEB-INF\web.xml
?????目錄???????????0??2016-09-18?19:23??AuthCode\out\production\
?????目錄???????????0??2016-09-18?20:09??AuthCode\out\production\AuthCode\
?????文件????????3181??2016-09-18?20:09??AuthCode\out\production\AuthCode\AuthCode.class
............此處省略11個文件信息