| | |
| | | import java.sql.Timestamp; |
| | | import java.util.*; |
| | | |
| | | /** |
| | | * Web帮助类 |
| | | * @author WWW |
| | | */ |
| | | @SuppressWarnings("ALL") |
| | | public class WebHelper { |
| | | private final static String UNKNOWN = "unknown"; |
| | | |
| | |
| | | |
| | | private final static Log log = LogFactory.getLog(WebHelper.class); |
| | | |
| | | /** |
| | | * 保留小数位 |
| | | */ |
| | | public static double round(double val, double size) { |
| | | double power = Math.pow(10.0, size); |
| | | |
| | | return Math.round(val * power) / power; |
| | | } |
| | | |
| | | /** |
| | | * 获取GUID |
| | | */ |
| | | public static String getGuid() { |
| | | return UUID.randomUUID().toString(); |
| | | } |
| | | |
| | | /** |
| | | * 获取用户ip |
| | | */ |
| | | public static String getIpAddress(HttpServletRequest request) { |
| | | String ip = request.getHeader("X-Forwarded-For"); |
| | | if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) { |
| | |
| | | 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 |
| | | */ |
| | | 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 |
| | | */ |
| | | public static String getTokenFromCookie(HttpServletRequest request) { |
| | | Cookie[] cookies = request.getCookies(); |
| | | if (cookies == null || cookies.length == 0) { |
| | |
| | | return null; |
| | | } |
| | | |
| | | /** |
| | | * 向Cookie中添加token |
| | | */ |
| | | public static void saveToken2Cookie(String token, HttpServletRequest request, HttpServletResponse response) { |
| | | // 先删除 |
| | | deleteCookies(request, response); |
| | | |
| | | // 再保存 |
| | | saveCookie(StaticData.TOKEN_COOKIE_KEY, token, response); |
| | | } |
| | | |
| | | /** |
| | | * 保存Cookie |
| | | */ |
| | | 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(SettingData.COOKIE_MAX_AGE); |
| | | cookie.setHttpOnly(false); |
| | | cookie.setPath("/"); |
| | |
| | | response.addCookie(cookie); |
| | | } |
| | | |
| | | /** |
| | | * 删除cookie中的值 |
| | | */ |
| | | public static void deleteCookie(String cookieKey, HttpServletRequest request, HttpServletResponse response) { |
| | | Cookie[] cookies = request.getCookies(); |
| | | if (cookies != null && cookies.length > 0) { |
| | |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 删除所有Cookie |
| | | */ |
| | | public static void deleteCookies(HttpServletRequest request, HttpServletResponse response) { |
| | | Cookie[] cookies = request.getCookies(); |
| | | if (cookies != null && cookies.length > 0) { |
| | |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 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; |
| | | } |
| | | |
| | | /** |
| | | * 获取Token |
| | | */ |
| | | 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 |
| | | */ |
| | | public static HttpServletRequest getRequest() { |
| | | ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes(); |
| | | |
| | | return servletRequestAttributes.getRequest(); |
| | | } |
| | | |
| | | /** |
| | | * 获取Response |
| | | */ |
| | | public static HttpServletResponse getResponse() { |
| | | ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes(); |
| | | |
| | | return servletRequestAttributes.getResponse(); |
| | | } |
| | | |
| | | /** |
| | | * 获取Session |
| | | */ |
| | | public static HttpSession getSession() { |
| | | return getRequest().getSession(); |
| | | } |
| | | |
| | | /** |
| | | * 获取真实路径 |
| | | */ |
| | | public static String getRealPath(String path) { |
| | | HttpServletRequest req = getRequest(); |
| | | ServletContext ctx = req.getSession().getServletContext(); |
| | |
| | | return ctx.getRealPath("/" + path); |
| | | } |
| | | |
| | | /** |
| | | * 输出str至前端 |
| | | */ |
| | | public static boolean writeStr2Page(HttpServletResponse res, String str) { |
| | | try { |
| | | res.setContentType("application/json;charset=UTF-8"); |
| | |
| | | return false; |
| | | } |
| | | |
| | | /** |
| | | * 输出json至前端 |
| | | */ |
| | | public static void writeJson2Page(HttpServletResponse res, String str) { |
| | | String json = JSON.toJSONString(new ResponseMsg<>(HttpStatus.ERROR, str)); |
| | | writeStr2Page(res, json); |
| | | } |
| | | |
| | | /** |
| | | * 获取错误JSON |
| | | */ |
| | | public static String getErrJson(HttpStatus status, String msg) { |
| | | return JSON.toJSONString(new ResponseMsg<String>(status, msg)); |
| | | } |
| | | |
| | | /** |
| | | * 写响应信息 |
| | | */ |
| | | public static void writeInfo(HttpStatus status, String info, HttpServletResponse res) { |
| | | WebHelper.writeStr2Page(res, WebHelper.getErrJson(status, info)); |
| | | } |
| | | |
| | | /** |
| | | * 获取随机整数 |
| | | */ |
| | | public static int getRandomInt(int min, int max) { |
| | | return new Random().nextInt(max) % (max - min + 1) + min; |
| | | } |
| | | |
| | | /** |
| | | * 下载文件 |
| | | */ |
| | | public static void download(String file, String fileName, HttpServletResponse res) throws Exception { |
| | | download(file, fileName, false, res); |
| | | } |
| | | |
| | | /** |
| | | * 下载文件 |
| | | * |
| | | * @param file 文件 |
| | | * @param fileName 文件名 |
| | | * @param res 响应 |
| | | * @throws Exception 异常 |
| | | */ |
| | | public static void download(String file, String fileName, boolean inline, HttpServletResponse res) throws Exception { |
| | | if (StringHelper.isEmpty(fileName)) { |
| | | fileName = StringHelper.YMDHMS2_FORMAT.format(new Date()); |
| | |
| | | fileName = URLEncoder.encode(fileName, "UTF-8").replace("+", "%20"); |
| | | String dispose = inline ? "inline" : "attachment"; |
| | | |
| | | // 设置响应头中文件的下载方式为附件方式,以及设置文件名 |
| | | res.setHeader("Content-Disposition", dispose + "; filename*=UTF-8''" + fileName); |
| | | // 设置响应头的编码格式为 UTF-8 |
| | | res.setCharacterEncoding("UTF-8"); |
| | | |
| | | // 通过response对象设置响应数据格式(如:"text/plain; charset=utf-8") |
| | | String ext = FileHelper.getExtension(file); |
| | | String mime = FileHelper.getMime(ext); |
| | | res.setContentType(mime); |
| | | |
| | | // 通过response对象,获取到输出流 |
| | | ServletOutputStream outputStream = res.getOutputStream(); |
| | | // 定义输入流,通过输入流读取文件内容 |
| | | FileInputStream fileInputStream = new FileInputStream(file); |
| | | |
| | | int len = 0; |
| | | byte[] bytes = new byte[1024]; |
| | | while ((len = fileInputStream.read(bytes)) != -1) { |
| | | // 通过输入流读取文件数据,然后通过上述的输出流写回浏览器 |
| | | outputStream.write(bytes, 0, len); |
| | | outputStream.flush(); |
| | | } |
| | | |
| | | // 关闭资源 |
| | | fileInputStream.close(); |
| | | outputStream.close(); |
| | | } |
| | | |
| | | /** |
| | | * 执行命令 |
| | | * |
| | | * @param cmd 命令 |
| | | */ |
| | | public static void exec(String cmd) { |
| | | try { |
| | | Runtime.getRuntime().exec(cmd); |
| | | Process process = Runtime.getRuntime().exec(cmd); |
| | | process.waitFor(); |
| | | } catch (Exception ex) { |
| | | log.error(ex.getMessage(), ex); |
| | | } |
| | | } |
| | | |
| | | /** |
| | | * 获取请求的参数值 |
| | | * |
| | | * @param req 请求 |
| | | * @param key 参数名 |
| | | * @return 参数值 |
| | | */ |
| | | public static String getReqParamVal(HttpServletRequest req, String key) { |
| | | Map<String, String[]> maps = req.getParameterMap(); |
| | | for (Map.Entry<String, String[]> entry : maps.entrySet()) { |
| | |
| | | return null; |
| | | } |
| | | |
| | | /** |
| | | * 获取请求的参数值 |
| | | * |
| | | * @param req 请求 |
| | | * @param key 参数名 |
| | | * @return 参数值 |
| | | */ |
| | | public static String[] getReqParamVals(HttpServletRequest req, String key) { |
| | | Map<String, String[]> maps = req.getParameterMap(); |
| | | for (Map.Entry<String, String[]> entry : maps.entrySet()) { |