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java web工程引用java project（以二维码和加密为例）

2024-10-03 08:58:39   215人阅读

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

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 子工程目录结构

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javaweb工程目录（注意子工程的jar包也要拿过来）

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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=http://www.mamicode.com/‘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 =http://www.mamicode.com/= 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();
        }
    }

}

 

java web工程引用java project（以二维码和加密为例）


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