在多人开发同一个javaweb工程时，可以把java工程从外部调用，不必都写到一个javaweb工程，
通过将二维码和加密的java程序都写成单独的java工程，最后用一个javaweb工程调用，效果图如下
子工程目录结构
javaweb工程目录（注意子工程的jar包也要拿过来）
eclipse配置步骤：
主工程右键=>java build path =>projects=>add=>选择两个子工程
java build path=>libraries=>add class folder=>选中两个子工程的bin文件夹
java build path=>order and export=>选中子工程
Deployment assembly=>project=>选中子工程
配置文件和有关验证码的那篇随笔是一样的，这里不多说
userlogin.html
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>验证码??</title>
<script src="jquery/jquery-2.1.3.min.js" type="text/javascript"></script>
</head>
<body>
<div style="text-align:center;margin-top:200px;">
<input id="password" type="password" placeholder="输入密码" style="width:200px;height:30px;"/><br>
<input id="key" type="password" placeholder="输入秘钥" style="width:200px;height:30px;"/><br>
<input id="key" type="button" value="确认" onclick="javascript:checkedOk()" style="width:80px;height:30px;font-family:黑体;"/>
<font color="red" id="message"></font>
</div>
<div id="erweima" style="text-align:center;margin-left:57px;"></div>
</body>
<script type="text/javascript">
function checkedOk(){
var password = document.getElementById("password").value;
var key = document.getElementById("key").value;
$.ajax({
url:"login.do",
data:{password:password,key:key},
success:function(data){
alert(1565);
if(data.message == 1){
$("#erweima").html("<img src=‘erweimaimg.do‘>");
$("#message").text("");
}else{
$("#message").text("密码和秘钥不匹配");
$("#erweima").html("");
}
}
});
}
</script>
</html>
UserController.java
@Controller
public class UserController {
@RequestMapping(value = "/erweimaimg")
public void showImgCode(HttpServletResponse resp) {
try {
QRCodeEncoderHandler.encoderQRCode("http://www.baidu.com", resp.getOutputStream());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@RequestMapping(value = "/login.do")
@ResponseBody
public Object login(HttpServletRequest request) {
Map<String, String> message = new HashMap<String, String>();
String password = request.getParameter("password");
String key = request.getParameter("key");
String passwordsure;
try {
passwordsure = PasswordUtil.encrypt(PasswordUtil.getMD5(password), key);
if("Jjpx4STXruE3jZF1gG4D/BGE6w03JQK2szWUdavdsoevuVmxoV52Lw==".equals(passwordsure)){
message.put("message", "1");
}else{
message.put("message", "0");
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return message;
}
}
PasswordUtil.java
public class PasswordUtil {
/**
* @todo MD5加密
* @return String
* @param str
*/
public static String getMD5(String str) {
MessageDigest messageDigest = null;
try {
messageDigest = MessageDigest.getInstance("MD5");
messageDigest.reset();
messageDigest.update(str.getBytes("UTF-8"));
} catch (NoSuchAlgorithmException e) {
System.out.println("NoSuchAlgorithmException caught!");
System.exit(-1);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
byte[] byteArray = messageDigest.digest();
StringBuffer md5StrBuff = new StringBuffer();
for (int i = 0; i < byteArray.length; i++) {
if (Integer.toHexString(0xFF & byteArray[i]).length() == 1) md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
else md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
}
return md5StrBuff.toString();
}
/**
* Description 根据键值进行加密
* @param data
* @param key 加密键byte数组
* @return
* @throws Exception
*/
public static String encrypt(String data, String key) throws Exception {
byte[] bt = encrypt(data.getBytes(), key.getBytes());
String strs = new BASE64Encoder().encode(bt);
return strs;
}
/**
* Description 根据键值进行解密
* @param data
* @param key 加密键byte数组
* @return
* @throws IOException
* @throws Exception
*/
public static String decrypt(String data, String key) throws IOException,
Exception {
if (data == null)
return null;
BASE64Decoder decoder = new BASE64Decoder();
byte[] buf = decoder.decodeBuffer(data);
byte[] bt = decrypt(buf,key.getBytes());
return new String(bt);
}
/**
* Description 根据键值进行加密
* @param data
* @param key 加密键byte数组
* @return
* @throws Exception
*/
private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
// 生成一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密钥数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher对象实际完成加密操作
Cipher cipher = Cipher.getInstance("DES");
// 用密钥初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
return cipher.doFinal(data);
}
/**
* Description 根据键值进行解密
* @param data
* @param key 加密键byte数组
* @return
* @throws Exception
*/
private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
// 生成一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密钥数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance("DES");
// 用密钥初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
return cipher.doFinal(data);
}
}
QRCodeEncoderHandler.java //生成二维码
public class QRCodeEncoderHandler {
public static void encoderQRCode(String content, OutputStream outputStream) {
try {
Qrcode qrcodeHandler = new Qrcode();
// 设置二维码排错率，可选L(7%)、M(15%)、Q(25%)、H(30%)，排错率越高可存储的信息越少，但对二维码清晰度的要求越小
qrcodeHandler.setQrcodeErrorCorrect(‘M‘);
qrcodeHandler.setQrcodeEncodeMode(‘B‘);
qrcodeHandler.setQrcodeVersion(5);
byte[] contentBytes = content.getBytes("gb2312");
BufferedImage bufImg = new BufferedImage(250,250,BufferedImage.TYPE_INT_RGB);
Graphics2D gs = bufImg.createGraphics();
gs.setBackground(Color.WHITE);
gs.clearRect(0, 0, 250, 250);
// 设定图像颜色> BLACK
gs.setColor(Color.BLACK);
// 设置偏移量 不设置可能导致解析出错
int pixoff = 2;
// 输出内容> 二维码
if (contentBytes.length > 0 && contentBytes.length < 800) {
boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes);
for (int i = 0; i < codeOut.length; i++) {
for (int j = 0; j < codeOut.length; j++) {
if (codeOut[j][i]) {
gs.fillRect(j * 5 + pixoff, i * 5 + pixoff, 5, 5);
}
}
}
} else {
}
gs.dispose();
bufImg.flush();
ImageIO.write(bufImg, "png", outputStream);
} catch (Exception e) {
e.printStackTrace();
}
}
}
时间： 2024-10-10 22:35:17