JSP了圖形驗證碼-漢字
作者：Eve Cole
更新時間：2009-07-02 17:08:26
< %@page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*"%>
<%!
//create by smallnest
//email: [email protected]
//website:www.kuaff.com
//產生隨機顏色
Color getRandColor(Random random, int fc, int bc) {
if (fc > 255) fc = 255;
if (bc > 255) bc = 255;
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}
%>
<%
//設定頁面不緩存
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
// 設定圖片的長寬
int width = 176, height = 30;
//設定備選漢字，剔除一些不雅的漢字
String base = "u7684u4e00u4e86u662fu6211u4e0du5728u4ebau4eecu6709u6765u4ed6u8fd9u4eu6709u6765u4ed6u8fd9u4e0au740u750 ccu8bf4u5c31u53bb u5b50u5f97u4e5fu548cu90a3u8981u4e0bu770bu5929u65f6u8fc7u51fau5c0fu4e48u65f6u8fc7u51fau5c0fu4e48u65f6u8fc7u51fau5c0fu4e48u65f6u8fc7u51fau5c0fu4e48u au6ca1u4e3au53c8u53ef u5bb6u5b66u53eau4ee5u4e3bu4f1au6837u5e74u60f3u751fu540cu8001u4e2du5341u4eceu 540eu7136u8d70u5f88 u50cfu89c1u4e24u7528u5979u56fdu52a8u8fdbu6210u56deu4ec0u8fb9u4f5cu5bf9u5f000 19u7ecfu53d1u5de5 u5411u4e8bu547du7ed9u957fu6c34u51e0u4e49u4e09u58f0u4e8eu9ad8u624bu77e5u7406u73u cu95eeu4f46u8eabu65b9 u5b9eu5403u505au53ebu5f53u4f4fu542cu9769u6253u5462u771fu5168u624du56dbu5df2 u60c5u8defu5206u603b u6761u767du8bddu4e1cu5e2du6b21u4eb2u5982u88abu82b1u53e3u653eu513fu5e38u6c14u4e 7u6587u8fd0u518du679c u600eu5b9au8bb8u5febu660eu884cu56e0u522bu98deu5916u6811u7269u6d3bu90e8u95e8650 u961fu5148u529bu5b8c u5374u7ad9u4ee3u5458u673au66f4u4e5du60a8u6bcfu98ceu7ea7u8ddfu7b11u554au5b69u4e07 636u8fdeu8f66u91cd u4fbfu6597u9a6cu54eau5316u592au6307u53d8u793eu4f3cu58ebu8005u5e72u77f3u6 a76u5404u516du672c u601du89e3u7acbu6cb3u6751u516bu96beu65e9u8bbau5417u6839u5171u8ba9u76f8u7814514ecau5171u8ba9u76f8u781451ecau5176u u5173u4fe1u89c9u6b65 u53cdu5904u8bb0u5c06u5343u627eu4e89u9886u6216u5e08u7ed3u5757u8dd1u8c01u83498187 u7b49u4e60u9635u6015 u6708u9752u534au706bu6cd5u9898u5efau8d76u4f4du5531u6d77u4e03u5973u4efbu4ef65111u4e03u5973u4efbu4ef65116 u8272u8138u7247u79d1 u5012u775bu5229u4e16u521au4e14u7531u9001u5207u661fu5bfcu665au8868u591ffu5740u u8be5u5e76u5e95u6df1 u523bu5e73u4f1fu5fd9u63d0u786eu8fd1u4eaeu8f7bu8bb2u519cu53e4u9ed1u544au754cu620 3u7167u529eu53f2u6539 u5386u8f6cu753bu9020u5634u6b64u6cbbu5317u5fc5u670du96e8u7a7fu5185u8bc6u9a8 4u5f62u91cfu54b1u89c2 u82e6u4f53u4f17u901au51b2u5408u7834u53cbu5ea6u672fu996du516cu65c1u623fu6781uu516cu65c1u623fu6781uu516cu65c1u623fu6781u u91ceu575au7a7au6536 u7b97u81f3u653fu57ceu52b3u843du94b1u7279u56f4u5f1fu80dcu6559u70edu5c55u5305dc 1u547cu6027u97f3u7b54 u54e5u9645u65e7u795eu5ea7u7ae0u5e2eu5566u53d7u7cfbu4ee4u8df3u975eu4f55u725bu5366u 79cdu88c5u9876u6025 u6797u505cu606fu53e5u533au8863u822cu62a5u53f6u538bu6162u53d4u80ccu7ec6";
//備選漢字的長度
int length = base.length();
//建立記憶體圖像
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// 取得圖形上下文
Graphics g = image.getGraphics();
//建立隨機類別的實例
Random random = new Random();
// 設定圖片背景色(因為是做背景，所以偏淡)
g.setColor(getRandColor(random, 200, 250));
g.fillRect(0, 0, width, height);
//備選字體
String[] fontTypes = {
"u5b8bu4f53", "u65b0u5b8bu4f53", "u9ed1u4f53", "u6977u4f53", "u96b6u4e66"};
int fontTypesLength = fontTypes.length;
//在圖片背景上增加雜訊
g.setColor(getRandColor(random, 160, 200));
g.setFont(new Font("Times New Roman", Font.PLAIN, 14));
for (int i = 0; i < 6; i++) {
g.drawString("********************************************* ", 0, 5 * (i + 2));
}
//取隨機產生的認證碼(6個漢字)
//儲存產生的漢字字串
String sRand = "";
for (int i = 0; i < 6; i++) {
int start = random.nextInt(length);
String rand = base.substring(start, start + 1);
sRand += rand;
//設定字體的顏色
g.setColor(getRandColor(random, 10, 150));
//設定字體
g.setFont(new Font(fontTypes[random.nextInt(fontTypesLength)], Font.BOLD, 18 + random.nextInt(6)));
//將此漢字畫到圖片上
g.drawString(rand, 24 * i + 10 + random.nextInt(8), 24);
}
//將認證碼存入session
session.setAttribute("rand", sRand);
g.dispose();
//輸出圖像到頁面
ImageIO.write(image, "JPEG", response.getOutputStream());
%>
http://blog.csdn.net/besuccess/archive/2007/01/31/1499161.aspx
