JSP graphic verification code-Chinese characters
Author：Eve Cole
Update Time：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
//Generate random colors
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);
}
%>
<%
//Set the page not to be cached
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
//Set the length and width of the image
int width = 176, height = 30;
//Set alternative Chinese characters and eliminate some indecent Chinese characters
String base = "u7684u4e00u4e86u662fu6211u4e0du5728u4ebau4eecu6709u6765u4ed6u8fd9u4e0au7740u4e2au5730u5230u5927u91cc u8bf4u5c31u53bb u5b50u5f97u4e5fu548cu90a3u8981u4e0bu770bu5929u65f6u8fc7u51fau5c0fu4e48u8d77u4f60u90fdu628au597du8fd8u59 1au6ca1u4e3au53c8u53ef u5bb6u5b66u53eau4ee5u4e3bu4f1au6837u5e74u60f3u751fu540cu8001u4e2du5341u4eceu81eau9762u524du5934u9053u5b83u 540eu7136u8d70u5f88 u50cfu89c1u4e24u7528u5979u56fdu52a8u8fdbu6210u56deu4ec0u8fb9u4f5cu5bf9u5f00u800cu5df1u4e9bu73b0u5c71u6c11 u5019u7ecfu53d1u5de5 u5411u4e8bu547du7ed9u957fu6c34u51e0u4e49u4e09u58f0u4e8eu9ad8u624bu77e5u7406u773cu5fd7u70b9u5fc3u6218u4e 8cu95eeu4f46u8eabu65b9 u5b9eu5403u505au53ebu5f53u4f4fu542cu9769u6253u5462u771fu5168u624du56dbu5df2u6240u654cu4e4bu6700u5149u4 ea7u60c5u8defu5206u603b u6761u767du8bddu4e1cu5e2du6b21u4eb2u5982u88abu82b1u53e3u653eu513fu5e38u6c14u4e94u7b2cu4f7fu5199u519bu542 7u6587u8fd0u518du679c u600eu5b9au8bb8u5febu660eu884cu56e0u522bu98deu5916u6811u7269u6d3bu90e8u95e8u65e0u5f80u8239u671bu65b0u5e2 6u961fu5148u529bu5b8c u5374u7ad9u4ee3u5458u673au66f4u4e5du60a8u6bcfu98ceu7ea7u8ddfu7b11u554au5b69u4e07u5c11u76f4u610fu591cu6bd4u9 636u8fdeu8f66u91cd u4fbfu6597u9a6cu54eau5316u592au6307u53d8u793eu4f3cu58ebu8005u5e72u77f3u6ee1u65e5u51b3u767eu539fu62ffu7fa4u 7a76u5404u516du672c u601du89e3u7acbu6cb3u6751u516bu96beu65e9u8bbau5417u6839u5171u8ba9u76f8u7814u4ecau5176u4e66u5750u63a5u5e94 u5173u4fe1u89c9u6b65 u53cdu5904u8bb0u5c06u5343u627eu4e89u9886u6216u5e08u7ed3u5757u8dd1u8c01u8349u8d8au5b57u52a0u811au7d27u723 1u7b49u4e60u9635u6015 u6708u9752u534au706bu6cd5u9898u5efau8d76u4f4du5531u6d77u4e03u5973u4efbu4ef6u611fu51c6u5f20u56e2u5c4bu79bb u8272u8138u7247u79d1 u5012u775bu5229u4e16u521au4e14u7531u9001u5207u661fu5bfcu665au8868u591fu6574u8ba4u54cdu96eau6d41u672au57 3au8be5u5e76u5e95u6df1 u523bu5e73u4f1fu5fd9u63d0u786eu8fd1u4eaeu8f7bu8bb2u519cu53e4u9ed1u544au754cu62c9u540du5440u571fu6e05u963 3u7167u529eu53f2u6539 u5386u8f6cu753bu9020u5634u6b64u6cbbu5317u5fc5u670du96e8u7a7fu5185u8bc6u9a8cu4f20u4e1au83dcu722cu7761u5 174u5f62u91cfu54b1u89c2 u82e6u4f53u4f17u901au51b2u5408u7834u53cbu5ea6u672fu996du516cu65c1u623fu6781u5357u67aau8bfbu6c99u5c81u7 ebfu91ceu575au7a7au6536 u7b97u81f3u653fu57ceu52b3u843du94b1u7279u56f4u5f1fu80dcu6559u70edu5c55u5305u6b4cu7c7bu6e10u5f3au6570u4e 61u547cu6027u97f3u7b54 u54e5u9645u65e7u795eu5ea7u7ae0u5e2eu5566u53d7u7cfbu4ee4u8df3u975eu4f55u725bu53d6u5165u5cb8u6562u6389u5ffd u79cdu88c5u9876u6025 u6797u505cu606fu53e5u533au8863u822cu62a5u53f6u538bu6162u53d4u80ccu7ec6";
//length of alternative Chinese characters
int length = base.length();
//Create memory image
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// Get graphics context
Graphics g = image.getGraphics();
//Create an instance of a random class
Random random = new Random();
//Set the background color of the image (because it is used as a background, it is lighter)
g.setColor(getRandColor(random, 200, 250));
g.fillRect(0, 0, width, height);
//alternative font
String[] fontTypes = {
"u5b8bu4f53", "u65b0u5b8bu4f53", "u9ed1u4f53", "u6977u4f53", "u96b6u4e66"};
int fontTypesLength = fontTypes.length;
//Add noise to the image background
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));
}
//Get the randomly generated authentication code (6 Chinese characters)
//Save the generated Chinese character string
String sRand = "";
for (int i = 0; i < 6; i++) {
int start = random.nextInt(length);
String rand = base.substring(start, start + 1);
sRand += rand;
//Set the font color
g.setColor(getRandColor(random, 10, 150));
//Set font
g.setFont(new Font(fontTypes[random.nextInt(fontTypesLength)], Font.BOLD, 18 + random.nextInt(6)));
//Draw this Chinese character onto the picture
g.drawString(rand, 24 * i + 10 + random.nextInt(8), 24);
}
//Save the authentication code into the session
session.setAttribute("rand", sRand);
g.dispose();
//Output the image to the page
ImageIO.write(image, "JPEG", response.getOutputStream());
%>
http://blog.csdn.net/besuccess/archive/2007/01/31/1499161.aspx
