【java工具类】解决分布式session的问题+CookieUtils代码Cookie获取删除设置过期时间已经获取域名服务器名称session设置不同登录的设备的分布式源码

旧城等待， 2023-07-09 14:27 4阅读 0赞

# CookieUtils #

public final class CookieUtils {
    
    	/**
    	 * 得到Cookie的值, 不编码
    	 * 
    	 * @param request
    	 * @param cookieName
    	 * @return
    	 */
    	public static String getCookieValue(HttpServletRequest request, String cookieName) {
    		return getCookieValue(request, cookieName, false);
    	}
    
    	/**
    	 * 得到Cookie的值,
    	 * 
    	 * @param request
    	 * @param cookieName
    	 * @return
    	 */
    	public static String getCookieValue(HttpServletRequest request, String cookieName, boolean isDecoder) {
    		Cookie[] cookieList = request.getCookies();
    		if (cookieList == null || cookieName == null) {
    			return null;
    		}
    		String retValue = null;
    		try {
    			for (int i = 0; i < cookieList.length; i++) {
    				if (cookieList[i].getName().equals(cookieName)) {
    					if (isDecoder) {
    						retValue = URLDecoder.decode(cookieList[i].getValue(), "UTF-8");
    					} else {
    						retValue = cookieList[i].getValue();
    					}
    					break;
    				}
    			}
    		} catch (UnsupportedEncodingException e) {
    			e.printStackTrace();
    		}
    		return retValue;
    	}
    
    	/**
    	 * 得到Cookie的值,
    	 * 
    	 * @param request
    	 * @param cookieName
    	 * @return
    	 */
    	public static String getCookieValue(HttpServletRequest request, String cookieName, String encodeString) {
    		Cookie[] cookieList = request.getCookies();
    		if (cookieList == null || cookieName == null) {
    			return null;
    		}
    		String retValue = null;
    		try {
    			for (int i = 0; i < cookieList.length; i++) {
    				if (cookieList[i].getName().equals(cookieName)) {
    					retValue = URLDecoder.decode(cookieList[i].getValue(), encodeString);
    					break;
    				}
    			}
    		} catch (UnsupportedEncodingException e) {
    			e.printStackTrace();
    		}
    		return retValue;
    	}
    
    	/**
    	 * 设置Cookie的值 不设置生效时间默认浏览器关闭即失效,也不编码
    	 */
    	public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
    			String cookieValue) {
    		setCookie(request, response, cookieName, cookieValue, -1);
    	}
    
    	/**
    	 * 设置Cookie的值 在指定时间内生效,但不编码
    	 */
    	public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
    			String cookieValue, int cookieMaxage) {
    		setCookie(request, response, cookieName, cookieValue, cookieMaxage, false);
    	}
    
    	/**
    	 * 设置Cookie的值 不设置生效时间,但编码
    	 */
    	public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
    			String cookieValue, boolean isEncode) {
    		setCookie(request, response, cookieName, cookieValue, -1, isEncode);
    	}
    
    	/**
    	 * 设置Cookie的值 在指定时间内生效, 编码参数
    	 */
    	public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
    			String cookieValue, int cookieMaxage, boolean isEncode) {
    		doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, isEncode);
    	}
    
    	/**
    	 * 设置Cookie的值 在指定时间内生效, 编码参数(指定编码)
    	 */
    	public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
    			String cookieValue, int cookieMaxage, String encodeString) {
    		doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, encodeString);
    	}
    
    	/**
    	 * 删除Cookie带cookie域名
    	 */
    	public static void deleteCookie(HttpServletRequest request, HttpServletResponse response, String cookieName) {
    		doSetCookie(request, response, cookieName, "", -1, false);
    	}
    
    	/**
    	 * 设置Cookie的值，并使其在指定时间内生效
    	 * 
    	 * @param cookieMaxage
    	 *            cookie生效的最大秒数
    	 */
    	private static final void doSetCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
    			String cookieValue, int cookieMaxage, boolean isEncode) {
    		try {
    			if (cookieValue == null) {
    				cookieValue = "";
    			} else if (isEncode) {
    				cookieValue = URLEncoder.encode(cookieValue, "utf-8");
    			}
    			Cookie cookie = new Cookie(cookieName, cookieValue);
    			if (cookieMaxage > 0)
    				cookie.setMaxAge(cookieMaxage);
    			if (null != request) {// 设置域名的cookie
    				String domainName = getDomainName(request);
    				System.out.println(domainName);
    				if (!"localhost".equals(domainName)) {
    					// cookie.setDomain(domainName);
    				}
    			}
    			cookie.setPath("/");
    			response.addCookie(cookie);
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    	}
    
    	/**
    	 * 设置Cookie的值，并使其在指定时间内生效
    	 * 
    	 * @param cookieMaxage
    	 *            cookie生效的最大秒数
    	 */
    	private static final void doSetCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
    			String cookieValue, int cookieMaxage, String encodeString) {
    		try {
    			if (cookieValue == null) {
    				cookieValue = "";
    			} else {
    				cookieValue = URLEncoder.encode(cookieValue, encodeString);
    			}
    			Cookie cookie = new Cookie(cookieName, cookieValue);
    			if (cookieMaxage > 0)
    				cookie.setMaxAge(cookieMaxage);
    			if (null != request) {// 设置域名的cookie
    				String domainName = getDomainName(request);
    				System.out.println(domainName);
    				if (!"localhost".equals(domainName)) {
    					// 本地测试的时候不要写.实际发布时在打开
    					// cookie.setDomain(domainName);
    				}
    			}
    			cookie.setPath("/");
    			response.addCookie(cookie);
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    	}
    
    	/**
    	 * 得到cookie的域名
    	 */
    	private static final String getDomainName(HttpServletRequest request) {
    		String domainName = null;
    
    		String serverName = request.getRequestURL().toString();
    		if (serverName == null || serverName.equals("")) {
    			domainName = "";
    		} else {
    			final int end = serverName.lastIndexOf("/");
    			serverName = serverName.substring(0, end);
    			final String[] domains = serverName.split("\\.");
    			int len = domains.length;
    			if (len > 3) {
    				// www.xxx.com.cn
    				domainName = "." + domains[len - 3] + "." + domains[len - 2] + "." + domains[len - 1];
    			} else if (len <= 3 && len > 1) {
    				// xxx.com or xxx.cn
    				domainName = "." + domains[len - 2] + "." + domains[len - 1];
    			} else {
    				domainName = serverName;
    			}
    		}
    
    		if (domainName != null && domainName.indexOf(":") > 0) {
    			String[] ary = domainName.split("\\:");
    			domainName = ary[0];
    		}
    		return domainName;
    	}
    
    }

# 解决分布式session的问题 #

// 目的为了 解决分布式session的问题
    public class RandomValidateCodeUtil {
    
    	public static final String RANDOMCODEKEY = "RANDOMVALIDATECODEKEY";// 放到session中的key
    	private String randString = "0123456789";// 随机产生只有数字的字符串 private String
    	// private String randString = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生只有字母的字符串
    	// private String randString =
    	// "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生数字与字母组合的字符串
    	private int width = 95;// 图片宽
    	private int height = 25;// 图片高
    	private int lineSize = 40;// 干扰线数量
    	private int stringNum = 4;// 随机产生字符数量
    
    	private static final Logger logger = LoggerFactory.getLogger(RandomValidateCodeUtil.class);
    
    	private Random random = new Random();
    
    	/**
    	 * 获得字体
    	 */
    	private Font getFont() {
    		return new Font("Fixedsys", Font.CENTER_BASELINE, 18);
    	}
    
    	/**
    	 * 获得颜色
    	 */
    	private Color getRandColor(int fc, int bc) {
    		if (fc > 255)
    			fc = 255;
    		if (bc > 255)
    			bc = 255;
    		int r = fc + random.nextInt(bc - fc - 16);
    		int g = fc + random.nextInt(bc - fc - 14);
    		int b = fc + random.nextInt(bc - fc - 18);
    		return new Color(r, g, b);
    	}
    
    	/**
    	 * 生成随机图片
    	 */
    	public void getRandcode(HttpServletRequest request, HttpServletResponse response) {
    		HttpSession session = request.getSession();
    		// BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
    		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
    		Graphics g = image.getGraphics();// 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作
    		g.fillRect(0, 0, width, height);// 图片大小
    		g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));// 字体大小
    		g.setColor(getRandColor(110, 133));// 字体颜色
    		// 绘制干扰线
    		for (int i = 0; i <= lineSize; i++) {
    			drowLine(g);
    		}
    		// 绘制随机字符
    		String randomString = "";
    		for (int i = 1; i <= stringNum; i++) {
    			randomString = drowString(g, randomString, i);
    		}
    		logger.info(randomString);
    		// 将生成的随机字符串保存到session中
    		session.removeAttribute(RANDOMCODEKEY);
    		session.setAttribute(RANDOMCODEKEY, randomString);
    		g.dispose();
    		try {
    			// 将内存中的图片通过流动形式输出到客户端
    			ImageIO.write(image, "JPEG", response.getOutputStream());
    		} catch (Exception e) {
    			logger.error("将内存中的图片通过流动形式输出到客户端失败>>>>   ", e);
    		}
    
    	}
    
    	/**
    	 * 绘制字符串
    	 */
    	private String drowString(Graphics g, String randomString, int i) {
    		g.setFont(getFont());
    		g.setColor(new Color(random.nextInt(101), random.nextInt(111), random.nextInt(121)));
    		String rand = String.valueOf(getRandomString(random.nextInt(randString.length())));
    		randomString += rand;
    		g.translate(random.nextInt(3), random.nextInt(3));
    		g.drawString(rand, 13 * i, 16);
    		return randomString;
    	}
    
    	/**
    	 * 绘制干扰线
    	 */
    	private void drowLine(Graphics g) {
    		int x = random.nextInt(width);
    		int y = random.nextInt(height);
    		int xl = random.nextInt(13);
    		int yl = random.nextInt(15);
    		g.drawLine(x, y, x + xl, y + yl);
    	}
    
    	/**
    	 * 获取随机的字符
    	 */
    	public String getRandomString(int num) {
    		return String.valueOf(randString.charAt(num));
    	}
    
    	public static Boolean checkVerify(String verifiCode, HttpSession httpSession) {
    		if (StringUtils.isEmpty(verifiCode)) {
    			return false;
    		}
    		String random = (String) httpSession.getAttribute("RANDOMVALIDATECODEKEY");
    		if (StringUtils.isEmpty(random)) {
    			return false;
    		}
    		if (!random.equals(verifiCode)) {
    			return false;
    		}
    		return true;
    	}
    }