內蒙古java團隊

ChineseVal.jsp

<%@ page? pageEncoding = "gb2312" contentType="image/jpeg" import = "javax.imageio.*,java.util.*,java.awt.image.*,java.awt.*" %>

<%!

??? //在此處 獲取并生成隨機顏色

??? 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...省略文字。。。" ;

??? //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
??? Graphics g = image.getGraphics();

??? // 創建隨機函數的實例

??? Random random = new Random();

??? //此處 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();??

%>