基于JavaWeb(Servlet+Mybatis+Thymeleaf)的在线学习考试系统

package com.book.utils; import javax.servlet.http.HttpServletRequest; import java.io.UnsupportedEncodingException; import java.math.BigDecimal; import java.math.BigInteger; import java.net.InetAddress; import java.net.NetworkInterface; import java.net.SocketException; import java.net.UnknownHostException; import java.sql.Date; import java.util.*; import java.util.regex.Matcher; import java.util.regex.Pattern; /** * * @author 张代浩 * */ public class oConvertUtils { public static boolean isEmpty(Object object) { if (object == null) { return (true); } if (object.equals("")) { return (true); } if (object.equals("null")) { return (true); } return (false); } public static boolean isNotEmpty(Object object) { if (object != null && !object.equals("") && !object.equals("null")) { return (true); } return (false); } public static String decode(String strIn, String sourceCode, String targetCode) { String temp = code2code(strIn, sourceCode, targetCode); return temp; } public static String StrToUTF(String strIn, String sourceCode, String targetCode) { strIn = ""; try { strIn = new String(strIn.getBytes("ISO-8859-1"), "GBK"); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } return strIn; } private static String code2code(String strIn, String sourceCode, String targetCode) { String strOut = null; if (strIn == null || (strIn.trim()).equals("")) return strIn; try { byte[] b = strIn.getBytes(sourceCode); for (int i = 0; i < b.length; i++) { System.out.print(b[i] + " "); } strOut = new String(b, targetCode); } catch (Exception e) { e.printStackTrace(); return null; } return strOut; } public static int getInt(String s, int defval) { if (s == null || s == "") { return (defval); } try { return (Integer.parseInt(s)); } catch (NumberFormatException e) { return (defval); } } public static int getInt(String s) { if (s == null || s == "") { return 0; } try { return (Integer.parseInt(s)); } catch (NumberFormatException e) { return 0; } } public static int getInt(String s, Integer df) { if (s == null || s == "") { return df; } try { return (Integer.parseInt(s)); } catch (NumberFormatException e) { return 0; } } public static Integer[] getInts(String[] s) { Integer[] integer = new Integer[s.length]; if (s == null) { return null; } for (int i = 0; i < s.length; i++) { integer[i] = Integer.parseInt(s[i]); } return integer; } public static double getDouble(String s, double defval) { if (s == null || s == "") { return (defval); } try { return (Double.parseDouble(s)); } catch (NumberFormatException e) { return (defval); } } public static double getDou(Double s, double defval) { if (s == null) { return (defval); } return s; } public static int getInt(Object object, int defval) { if (isEmpty(object)) { return (defval); } try { return (Integer.parseInt(object.toString())); } catch (NumberFormatException e) { return (defval); } } public static int getInt(BigDecimal s, int defval) { if (s == null) { return (defval); } return s.intValue(); } public static Integer[] getIntegerArry(String[] object) { int len = object.length; Integer[] result = new Integer[len]; try { for (int i = 0; i < len; i++) { result[i] = new Integer(object[i].trim()); } return result; } catch (NumberFormatException e) { return null; } } public static String getString(String s) { return (getString(s, "")); } public static String getString(Object object) { if (isEmpty(object)) { return ""; } return (object.toString().trim()); } public static String getString(int i) { return (String.valueOf(i)); } public static String getString(float i) { return (String.valueOf(i)); } public static String getString(String s, String defval) { if (isEmpty(s)) { return (defval); } return (s.trim()); } public static String getString(Object s, String defval) { if (isEmpty(s)) { return (defval); } return (s.toString().trim()); } public static long stringToLong(String str) { Long test = new Long(0); try { test = Long.valueOf(str); } catch (Exception e) { } return test.longValue(); } /** * 获取本机IP */ public static String getIp() { String ip = null; try { InetAddress address = InetAddress.getLocalHost(); ip = address.getHostAddress(); } catch (UnknownHostException e) { e.printStackTrace(); } return ip; } /** * 判断一个类是否为基本数据类型。 * * @param clazz * 要判断的类。 * @return true 表示为基本数据类型。 */ private static boolean isBaseDataType(Class clazz) throws Exception { return (clazz.equals(String.class) || clazz.equals(Integer.class) || clazz.equals(Byte.class) || clazz.equals(Long.class) || clazz.equals(Double.class) || clazz.equals(Float.class) || clazz.equals(Character.class) || clazz.equals(Short.class) || clazz.equals(BigDecimal.class) || clazz.equals(BigInteger.class) || clazz.equals(Boolean.class) || clazz.equals(Date.class) || clazz.isPrimitive()); } /** * @param request * IP * @return IP Address */ public static String getIpAddrByRequest(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.getRemoteAddr(); } return ip; } /** * @return 本机IP * @throws SocketException */ public static String getRealIp() throws SocketException { String localip = null;// 本地IP，如果没有配置外网IP则返回它 String netip = null;// 外网IP Enumeration<NetworkInterface> netInterfaces = NetworkInterface.getNetworkInterfaces(); InetAddress ip = null; boolean finded = false;// 是否找到外网IP while (netInterfaces.hasMoreElements() && !finded) { NetworkInterface ni = netInterfaces.nextElement(); Enumeration<InetAddress> address = ni.getInetAddresses(); while (address.hasMoreElements()) { ip = address.nextElement(); if (!ip.isSiteLocalAddress() && !ip.isLoopbackAddress() && ip.getHostAddress().indexOf(":") == -1) {// 外网IP netip = ip.getHostAddress(); finded = true; break; } else if (ip.isSiteLocalAddress() && !ip.isLoopbackAddress() && ip.getHostAddress().indexOf(":") == -1) {// 内网IP localip = ip.getHostAddress(); } } } if (netip != null && !"".equals(netip)) { return netip; } else { return localip; } } /** * java去除字符串中的空格、回车、换行符、制表符 * * @param str * @return */ public static String replaceBlank(String str) { String dest = ""; if (str != null) { Pattern p = Pattern.compile("\\s*|\t|\r|\n"); Matcher m = p.matcher(str); dest = m.replaceAll(""); } return dest; } /** * 判断元素是否在数组内 * * @param substring * @param source * @return */ public static boolean isIn(String substring, String[] source) { if (source == null || source.length == 0) { return false; } for (int i = 0; i < source.length; i++) { String aSource = source[i]; if (aSource.equals(substring)) { return true; } } return false; } /** * �