java工具类
生成不重复随机数列表
/*取1-max（max可取到）amount:需要生成的个数，max:随机生成为1-max*/
public static List<Object> random(int amount, int max) {
if (amount > max) { // 需要数字总数必须小于数的最大值，以免死循环！
throw new ArrayStoreException(
"The amount of array element must smallar than the maximum value !");
}
int[] array = new int[amount];
for (int i = 0; i < array.length; i++) {
array[i] = -1; // 初始化数组，避免后面比对时数组内不能含有0。
}
Random random = new Random();
int num;
amount -= 1; // 数组下标比数组长度小1
while (amount >= 0) {
num = random.nextInt(max)+1;
if (exist(num, array, amount - 1)) {
continue;
}
array[amount] = num;
amount--;
}
List<Object> collect = Arrays.stream(array).boxed().collect(Collectors.toList());
return collect;
}
private static boolean exist(int num, int[] array, int need) {
for (int i = array.length - 1; i > need; i--) {// 大于need用于减少循环次数，提高效率。
if (num == array[i]) {
return true;
}
}
return false;
}
md5加密
/**
* 使用md5的算法进行加密
*/
public static String md5(String plainText) {
byte[] secretBytes = null;
try {
secretBytes = MessageDigest.getInstance("md5").digest(
plainText.getBytes());
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("没有md5这个算法！");
}
String md5code = new BigInteger(1, secretBytes).toString(16);// // 16进制数字
// 如果生成数字未满32位，需要前面补0
for (int i = 0; i < 32 - md5code.length(); i++) {
md5code = "0" + md5code;
}
return md5code;
}
检查json对象里面是否包含一些属性
/**
* description: 检查json对象里面是否包含一些属性，并且不为null
* @author zwq
* @date 2021/9/26 16:27
* @param jsonObject 检查json对象
* @param strings 检查的属性
* @return boolean
*/
public static boolean jsonObjectContains(JSONObject jsonObject,String... strings){
for(int i=0;i<strings.length;i++){
if(!jsonObject.containsKey(strings[i])){
return false;
}
if(jsonObject.get(strings[i]) == null){
return false;
}
}
return true;
}
过滤对象属性
/**
* description: 过滤对象属性
* @author zwq
* @date 2021/7/11 9:25
* @param object 过滤对象
* @param excludeProperties 过滤的属性（字符串数组形式）
* @return java.lang.String 返回的是jsontext
*/
public static String excludeProperty(Object object,String[] excludeProperties){
/**
* 指定排除属性过滤器和包含属性过滤器
* 指定排除属性过滤器：转换成JSON字符串时，排除哪些属性
* 指定包含属性过滤器：转换成JSON字符串时，包含哪些属性
*/
for (String s:excludeProperties){
System.out.println(s);
}
PropertyPreFilters filters = new PropertyPreFilters();
PropertyPreFilters.MySimplePropertyPreFilter excludefilter = filters.addFilter();
excludefilter.addExcludes(excludeProperties);
return JSONObject.toJSONString(object,excludefilter);
}
判断字符串是否为数字
/**
* description: 判断字符串是否为数字
* @author zwq
* @date 2021/9/8 22:02
* @param str
* @return boolean
*/
public static boolean isNumeric(String str) {
Pattern pattern = Pattern.compile("[0-9]*");
Matcher isNum = pattern.matcher(str);
if (isNum.matches()) {
return true;
} else {
return false;
}
}
判断字符串是否为日期格式
/**
* description: 判断字符串是否为日期格式
* @author zwq
* @date 2021/9/8 22:02
* @param strDate
* @return boolean
*/
public static boolean isDate(String strDate) {
Pattern pattern = Pattern
.compile("^((\\d{2}(([02468][048])|([13579][26]))[\\-\\/\\s]?((((0?[13578])|(1[02]))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])))))|(\\d{2}(([02468][1235679])|([13579][01345789]))[\\-\\/\\s]?((((0?[13578])|(1[02]))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\\-\\/\\s]?((0?[1-9])|(1[0-9])|(2[0-8]))))))(\\s(((0?[0-9])|([1-2][0-3]))\\:([0-5]?[0-9])((\\s)|(\\:([0-5]?[0-9])))))?$");
Matcher m = pattern.matcher(strDate);
if (m.matches()) {
return true;
} else {
return false;
}
}
验证手机号(大陆号码)
/**
* 大陆手机号码11位数，匹配格式：前三位固定格式+后8位任意数
* 此方法中前三位格式有：
* 13+任意数
* 145,147,149
* 15+除4的任意数(不要写^4，这样的话字母也会被认为是正确的)
* 166
* 17+3,5,6,7,8
* 18+任意数
* 198,199
* description: 验证大陆手机号
* @author zwq
* @date 2021/9/8 22:04
* @param str
* @return boolean
*/
public static boolean isChinaPhoneLegal(String str) throws PatternSyntaxException {
// ^ 匹配输入字符串开始的位置
// \d 匹配一个或多个数字，其中 \ 要转义，所以是 \\d
// $ 匹配输入字符串结尾的位置
String regExp = "^((13[0-9])|(14[5,7,9])|(15[0-3,5-9])|(166)|(17[3,5,6,7,8])" +
"|(18[0-9])|(19[8,9]))\\d{8}$";
Pattern p = Pattern.compile(regExp);
Matcher m = p.matcher(str);
return m.matches();
}
验证手机号(香港)
/**
* 香港手机号码8位数，5|6|8|9开头+7位任意数
* description: 验证香港手机号
* @author zwq
* @date 2021/9/8 22:05
* @param str
* @return boolean
*/
public static boolean isHKPhoneLegal(String str) throws PatternSyntaxException {
// ^ 匹配输入字符串开始的位置
// \d 匹配一个或多个数字，其中 \ 要转义，所以是 \\d
// $ 匹配输入字符串结尾的位置
String regExp = "^(5|6|8|9)\\d{7}$";
Pattern p = Pattern.compile(regExp);
Matcher m = p.matcher(str);
return m.matches();
}
验证身份证
/**
* description: 身份证有效验证
* @author zwq
* @date 2021/9/8 21:59
* @param IDStr 身份证号
* @return boolean
*/
public static boolean IDCardValidate(String IDStr) throws ParseException {
String[] ValCodeArr = { "1", "0", "X", "9", "8", "7", "6", "5", "4", "3", "2" };
String[] Wi = { "7", "9", "10", "5", "8", "4", "2", "1", "6", "3", "7", "9", "10", "5", "8", "4", "2" };
String Ai = "";
// ================ 号码的长度18位 ================
if (IDStr.length() != 18) {
return false;
}
// ================ 数字 除最后以为都为数字 ================
if (IDStr.length() == 18) {
Ai = IDStr.substring(0, 17);
}
if (isNumeric(Ai) == false) {
//errorInfo = "身份证15位号码都应为数字 ; 18位号码除最后一位外，都应为数字。";
return false;
}
// ================ 出生年月是否有效 ================
String strYear = Ai.substring(6, 10);// 年份
String strMonth = Ai.substring(10, 12);// 月份
String strDay = Ai.substring(12, 14);// 日
if (isDate(strYear + "-" + strMonth + "-" + strDay) == false) {
//errorInfo = "身份证生日无效。";
return false;
}
GregorianCalendar gc = new GregorianCalendar();
SimpleDateFormat s = new SimpleDateFormat("yyyy-MM-dd");
try {
if ((gc.get(Calendar.YEAR) - Integer.parseInt(strYear)) > 150 || (gc.getTime().getTime() - s.parse(strYear + "-" + strMonth + "-" + strDay).getTime()) < 0) {
//errorInfo = "身份证生日不在有效范围。";
return false;
}
} catch (NumberFormatException e) {
e.printStackTrace();
} catch (java.text.ParseException e) {
e.printStackTrace();
}
if (Integer.parseInt(strMonth) > 12 || Integer.parseInt(strMonth) == 0) {
//errorInfo = "身份证月份无效";
return false;
}
if (Integer.parseInt(strDay) > 31 || Integer.parseInt(strDay) == 0) {
//errorInfo = "身份证日期无效";
return false;
}
// ================ 地区码时候有效 ================
Hashtable h = GetAreaCode();
if (h.get(Ai.substring(0, 2)) == null) {
//errorInfo = "身份证地区编码错误。";
return false;
}
// ================ 判断最后一位的值 ================
int TotalmulAiWi = 0;
for (int i = 0; i < 17; i++) {
TotalmulAiWi = TotalmulAiWi + Integer.parseInt(String.valueOf(Ai.charAt(i))) * Integer.parseInt(Wi[i]);
}
int modValue = TotalmulAiWi % 11;
String strVerifyCode = ValCodeArr[modValue];
Ai = Ai + strVerifyCode;
if (IDStr.length() == 18) {
if (Ai.equals(IDStr) == false) {
//errorInfo = "身份证无效，不是合法的身份证号码";
return false;
}
} else {
return true;
}
return true;
}
验证邮箱
/**
* 验证邮箱
*
* @param email
* @return
*/
public static boolean checkEmail(String email) {
String regex = "^\\w+[-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*$ ";
return check(email, regex);
}
list去重
/**
* description: list去重
* @author zwq
* @date 2021/10/1 23:51
* @param list
* @return java.util.List
*/
public static List removeDuplicationByHashSet(List<Integer> list) {
HashSet set = new HashSet(list);
//把List集合所有元素清空
list.clear();
//把HashSet对象添加至List集合
list.addAll(set);
return list;
}
}
json转换工具
import java.util.List;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
/**
* json转换工具类
*/
public class JsonUtils {
// 定义jackson对象
private static final ObjectMapper MAPPER = new ObjectMapper();
/**
* 将对象转换成json字符串。
* <p>Title: pojoToJson</p>
* <p>Description: </p>
* @param data
* @return
*/
public static String objectToJson(Object data) {
try {
String string = MAPPER.writeValueAsString(data);
return string;
} catch (JsonProcessingException e) {
e.printStackTrace();
}
return null;
}
/**
* 将json结果集转化为对象
*
* @param jsonData json数据
* @param clazz 对象中的object类型
* @return
*/
public static <T> T jsonToPojo(String jsonData, Class<T> beanType) {
try {
T t = MAPPER.readValue(jsonData, beanType);
return t;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 将json数据转换成pojo对象list
* <p>Title: jsonToList</p>
* <p>Description: </p>
* @param jsonData
* @param beanType
* @return
*/
public static <T>List<T> jsonToList(String jsonData, Class<T> beanType) {
JavaType javaType = MAPPER.getTypeFactory().constructParametricType(List.class, beanType);
try {
List<T> list = MAPPER.readValue(jsonData, javaType);
return list;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
cookie的读写
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* Cookie 工具类
*
*/
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)) {
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 {
serverName = serverName.toLowerCase();
serverName = serverName.substring(7);
final int end = serverName.indexOf("/");
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;
}
}
获取异常的堆栈信息
import java.io.PrintWriter;
import java.io.StringWriter;
public class ExceptionUtil {
/**
* 获取异常的堆栈信息
*
* @param t
* @return
*/
public static String getStackTrace(Throwable t) {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
try {
t.printStackTrace(pw);
return sw.toString();
} finally {
pw.close();
}
}
}
各种id生成策略
import java.util.Random;
/**
* 各种id生成策略
* <p>Title: IDUtils</p>
* <p>Description: </p>
* @date 2015年7月22日下午2:32:10
* @version 1.0
*/
public class IDUtils {
/**
* 图片名生成
*/
public static String genImageName() {
//取当前时间的长整形值包含毫秒
long millis = System.currentTimeMillis();
//long millis = System.nanoTime();
//加上三位随机数
Random random = new Random();
int end3 = random.nextInt(999);
//如果不足三位前面补0
String str = millis + String.format("%03d", end3);
return str;
}
/**
* 商品id生成
*/
public static long genItemId() {
//取当前时间的长整形值包含毫秒
long millis = System.currentTimeMillis();
//long millis = System.nanoTime();
//加上两位随机数
Random random = new Random();
int end2 = random.nextInt(99);
//如果不足两位前面补0
String str = millis + String.format("%02d", end2);
long id = new Long(str);
return id;
}
public static void main(String[] args) {
for(int i=0;i< 100;i++)
System.out.println(genItemId());
}
}
