P2022036_Service.git

package com.lf.server.helper;
 
import com.lf.server.entity.all.StaticData;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
 
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Timestamp;
import java.util.Calendar;
import java.util.UUID;
 
/**
 * Web帮助类
 * @author WWW
 */
public class WebHelper {
    private final static String UNKNOWN = "unknown";
 
    private final static String COMMA = ",";
 
    /**
     * 获取GUID
     */
    public static String getGuid() {
        return UUID.randomUUID().toString();
    }
 
    /**
     * 获取用户ip
     *
     * @param request
     * @return
     */
    public static String getIpAddress(HttpServletRequest request) {
        String ip = request.getHeader("X-Forwarded-For");
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_CLUSTER_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_FORWARDED");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_VIA");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("REMOTE_ADDR");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        if (ip.contains(COMMA)) {
            return ip.split(",")[0];
        }
 
        return ip;
    }
 
    /**
     * 获取当前时间的Timestamp
     */
    public static Timestamp getCurrentTimestamp() {
        return new Timestamp(System.currentTimeMillis());
    }
 
    /**
     * 获取当前时间指定分钟数后的Timestamp
     *
     * @param min 分钟数
     * @return
     */
    public static Timestamp getTimestamp(int min) {
        Calendar now = Calendar.getInstance();
        now.add(Calendar.MINUTE, min);
 
        return new Timestamp(now.getTimeInMillis());
    }
 
    /**
     * 从Cookie中获取token
     *
     * @param request
     * @return
     */
    public static String getTokenFromCookie(HttpServletRequest request) {
        Cookie[] cookies = request.getCookies();
        if (cookies == null || cookies.length == 0) {
            return null;
        }
 
        for (Cookie cookie : cookies) {
            switch (cookie.getName()) {
                case StaticData.TOKEN_COOKIE_KEY:
                    return cookie.getValue();
                default:
                    break;
            }
        }
 
        return null;
    }
 
    /**
     * 向Cookie中添加token
     *
     * @param token
     * @param request
     * @param response
     */
    public static void saveToken2Cookie(String token, HttpServletRequest request, HttpServletResponse response) {
        // 先删除
        deleteAll(request, response);
 
        // 再保存
        saveCookie(StaticData.TOKEN_COOKIE_KEY, token, response);
    }
 
    /**
     * 保存Cookie
     *
     * @param key
     * @param value
     * @param response
     */
    public static void saveCookie(String key, String value, HttpServletResponse response) {
        Cookie cookie = new Cookie(key, value);
        // 设置cookie失效时间，单位为秒
        cookie.setMaxAge(4 * 60 * 60);
        cookie.setHttpOnly(false);
        cookie.setPath("/");
        //cookie.setDomain("*")
 
        response.setHeader("P3P", "CP=CAO PSA OUR");
        response.addCookie(cookie);
    }
 
    /**
     * 删除cookie中的值
     *
     * @param cookieKey
     * @param request
     */
    public static void deleteCookie(String cookieKey, HttpServletRequest request, HttpServletResponse response) {
        Cookie[] cookies = request.getCookies();
        if (cookies != null && cookies.length > 0) {
            for (Cookie c : cookies) {
                if (cookieKey.equalsIgnoreCase(c.getName())) {
                    c.setMaxAge(0);
                    c.setPath("/");
                    response.addCookie(c);
                }
            }
        }
    }
 
    /**
     * 删除所有Cookie
     *
     * @param request
     * @param response
     */
    public static void deleteAll(HttpServletRequest request, HttpServletResponse response) {
        Cookie[] cookies = request.getCookies();
        if (cookies != null && cookies.length > 0) {
            for (Cookie c : cookies) {
                c.setMaxAge(0);
                c.setPath("/");
                response.addCookie(c);
            }
        }
    }
 
    /**
     * 根据键获取Cookie值
     */
    public static String getCookieByKey(String key,HttpServletRequest request) {
        Cookie[] cookies = request.getCookies();
        if (cookies == null || cookies.length == 0) {
            return null;
        }
 
        for (Cookie c : cookies) {
            if (key.equals(c.getName())) {
                return c.getValue();
            }
        }
 
        return null;
    }
 
    /**
     * 获取Token
     *
     * @param request
     * @return
     */
    public static String getToken(HttpServletRequest request) {
        // 1.从url参数中，获取token
        String token = request.getParameter(StaticData.TOKEN_KEY);
 
        // 2.为空，则从header里获取
        if (token == null) {
            token = request.getHeader(StaticData.TOKEN_KEY);
        }
 
        // 3.还为空，则从cookie里获取
        if (token == null) {
            token = getTokenFromCookie(request);
        }
 
        return token;
    }
 
    /**
     * 获取Request
     *
     * @return
     */
    public static HttpServletRequest getRequest() {
        ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
 
        return servletRequestAttributes.getRequest();
    }
 
    /**
     * 获取Response
     *
     * @return
     */
    public static HttpServletResponse getResponse() {
        ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
 
        return servletRequestAttributes.getResponse();
    }
 
    /**
     * 获取Session
     *
     * @return
     */
    public static HttpSession getSession() {
        return getRequest().getSession();
    }
 
    /**
     * 输出json数据到前端
     *
     * @param response
     * @param jsonPack
     * @throws Exception
     */
    public static void write2Page(HttpServletResponse response, String jsonPack) throws IOException {
        response.setContentType("application/json;charset=UTF-8");
        response.setHeader("Cache-Control", "no-cache");
        response.setHeader("Pragma", "No-cache");
        response.setDateHeader("Expires", 0);
 
        PrintWriter out = response.getWriter();
        out.print(jsonPack);
 
        out.flush();
        out.close();
    }
}