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JSP中文驗證碼

編輯：關於JSP

<%@ page pageEncoding = "gb2312" contentType="image/jpeg" import = "javax.imageio.*,java.util.*,java.awt.image.*,java.awt.*" %>
<%!
    //在此處獲取並生成隨機顏色
    Color getRandColor(Random random, int ff, int cc) {
       if (ff > 255)
           ff = 255;
       if (cc > 255)
           cc = 255;
       int r = ff + random.nextInt(cc - ff);
       int g = ff + random.nextInt(cc - ff);
       int b = ff + random.nextInt(cc - ff);
       return new Color(r, g, b);
    } %>
<%
    //在此處設置JSP頁面無緩存
    response.setHeader( "Pragma" , "No-cache" );
    response.setHeader( "Cache-Control" , "no-cache" );
    response.setDateHeader( "Expires" , 0);
    // 設置圖片的長寬
    int width = 130;
    int height = 30;
    //設定被隨機選取的中文字，此處中文字內容過多，不一一列出，只是舉例說明下。
    String base = "\u9752\u534a\u706b\u6cd5\u9898\u5efa\u8d76\u4f4d\u5531\u6d77\u4e03\u5973\u4efb\u4ef6\u611f\u51c6\u97f3\u7b54\u54e5\u9645\u65e7\u795e\u5ea7\u7ae0\u538b\u6162\u53d4\u80cc\u7ec6" ;
    //設置備選隨機漢字的個數
    int length = base.length();
    //創建緩存圖像
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    //獲取圖像對象
    Graphics g = image.getGraphics();
    //創建隨機函數
    Random random = new Random();
    //設定圖像背景色
    g.setColor(getRandColor(random, 188, 235));
    g.fillRect(0, 0, width, height);
    //設置隨機備選的字體類型
    String[] fontTypes = { "\u5b8b\u4f53" , "\u65b0\u5b8b\u4f53" ,
           "\u9ed1\u4f53" , "\u6977\u4f53" , "\u96b6\u4e66" };
    int fontTypesLength = fontTypes.length;
    // 在圖片背景上增加噪點，增加圖片分析難度
    g.setColor(getRandColor(random, 180, 199));
    g.setFont( new Font( "Times New Roman" , Font.PLAIN, 14));
    for ( int i = 0; i < 4; i++) {
       g.drawString( "@*@*@*@*@*@*@*" ,
       0, 5 * (i + 2));
    }
    // 取隨機產生的驗證碼 (4 個漢字 )
    // 保存生成的漢字字符串
    String sRand = "" ;
    for ( int i = 0; i < 4; i++) {
       int start = random.nextInt(length);
       String rand = base.substring(start, start + 1);
       sRand += rand;
       // 設置圖片上字體的顏色
       g.setColor(getRandColor(random, 10, 150));
       // 設置字體格式
       g.setFont( new Font(fontTypes[random.nextInt(fontTypesLength)],
       Font.BOLD, 18 + random.nextInt(6)));
       // 將此漢字畫到驗證圖片上面
       g.drawString(rand, 24 * i + 10 + random.nextInt(8), 24);
    }
    // 將驗證碼存入S ession中
    session.setAttribute( "rand" , sRand);
    g.dispose();
    //將圖象輸出到JSP頁面中
    ImageIO.write(image, "JPEG" , response.getOutputStream());
    //關閉流
    out.clear();
    out=pageContext.pushBody();
%>
<%@ page pageEncoding = "gb2312" contentType="image/jpeg" import = "javax.imageio.*,java.util.*,java.awt.image.*,java.awt.*" %>
<%!
    //在此處獲取並生成隨機顏色
    Color getRandColor(Random random, int ff, int cc) {
       if (ff > 255)
           ff = 255;
       if (cc > 255)
           cc = 255;
       int r = ff + random.nextInt(cc - ff);
       int g = ff + random.nextInt(cc - ff);
       int b = ff + random.nextInt(cc - ff);
       return new Color(r, g, b);
    } %>
<%
    //在此處設置JSP頁面無緩存
    response.setHeader( "Pragma" , "No-cache" );
    response.setHeader( "Cache-Control" , "no-cache" );
    response.setDateHeader( "Expires" , 0);
    // 設置圖片的長寬 www.2cto.com
    int width = 130;
    int height = 30;
    //設定被隨機選取的中文字，此處中文字內容過多，不一一列出，只是舉例說明下。
    String base = "\u9752\u534a\u706b\u6cd5\u9898\u5efa\u8d76\u4f4d\u5531\u6d77\u4e03\u5973\u4efb\u4ef6\u611f\u51c6\u97f3\u7b54\u54e5\u9645\u65e7\u795e\u5ea7\u7ae0\u538b\u6162\u53d4\u80cc\u7ec6" ;
    //設置備選隨機漢字的個數
    int length = base.length();
    //創建緩存圖像
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    //獲取圖像對象
    Graphics g = image.getGraphics();
    //創建隨機函數
    Random random = new Random();
    //設定圖像背景色
    g.setColor(getRandColor(random, 188, 235));
    g.fillRect(0, 0, width, height);
    //設置隨機備選的字體類型
    String[] fontTypes = { "\u5b8b\u4f53" , "\u65b0\u5b8b\u4f53" ,
           "\u9ed1\u4f53" , "\u6977\u4f53" , "\u96b6\u4e66" };
    int fontTypesLength = fontTypes.length;
    // 在圖片背景上增加噪點，增加圖片分析難度
    g.setColor(getRandColor(random, 180, 199));
    g.setFont( new Font( "Times New Roman" , Font.PLAIN, 14));
    for ( int i = 0; i < 4; i++) {
       g.drawString( "@*@*@*@*@*@*@*" ,
       0, 5 * (i + 2));
    }
    // 取隨機產生的驗證碼 (4 個漢字 )
    // 保存生成的漢字字符串
    String sRand = "" ;
    for ( int i = 0; i < 4; i++) {
       int start = random.nextInt(length);
       String rand = base.substring(start, start + 1);
       sRand += rand;
       // 設置圖片上字體的顏色
       g.setColor(getRandColor(random, 10, 150));
       // 設置字體格式
       g.setFont( new Font(fontTypes[random.nextInt(fontTypesLength)],
       Font.BOLD, 18 + random.nextInt(6)));
       // 將此漢字畫到驗證圖片上面
       g.drawString(rand, 24 * i + 10 + random.nextInt(8), 24);
    }
    // 將驗證碼存入S ession中
    session.setAttribute( "rand" , sRand);
    g.dispose();
    //將圖象輸出到JSP頁面中
    ImageIO.write(image, "JPEG" , response.getOutputStream());
    //關閉流
    out.clear();
    out=pageContext.pushBody();
%>