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java常用工具类汇总
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java常用工具类汇总
分页工具类
package io.renren.utils;
import java.io.Serializable;
import java.util.List;
/**
* 分页工具类
*
* @author chenshun
* @email sunlightcs@gmail.com
* @date 2016年11月4日 下午12:59:00
*/
public class PageUtils implements Serializable {
private static final long serialVersionUID = 1L;
//总记录数
private int totalCount;
//每页记录数
private int pageSize;
//总页数
private int totalPage;
//当前页数
private int currPage;
//列表数据
private List<?> list;
/**
* 分页
* @param list 列表数据
* @param totalCount 总记录数
* @param pageSize 每页记录数
* @param currPage 当前页数
*/
public PageUtils(List<?> list, int totalCount, int pageSize, int currPage) {
this.list = list;
this.totalCount = totalCount;
this.pageSize = pageSize;
this.currPage = currPage;
this.totalPage = (int)Math.ceil((double)totalCount/pageSize);
}
public int getTotalCount() {
return totalCount;
}
public void setTotalCount(int totalCount) {
this.totalCount = totalCount;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public int getTotalPage() {
return totalPage;
}
public void setTotalPage(int totalPage) {
this.totalPage = totalPage;
}
public int getCurrPage() {
return currPage;
}
public void setCurrPage(int currPage) {
this.currPage = currPage;
}
public List<?> getList() {
return list;
}
public void setList(List<?> list) {
this.list = list;
}
}
查询参数工具类
package io.renren.utils;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* 查询参数
*
* @author chenshun
* @email sunlightcs@gmail.com
* @date 2017-03-14 23:15
*/
public class Query extends LinkedHashMap<String, Object> {
private static final long serialVersionUID = 1L;
//当前页码
private int page;
//每页条数
private int limit;
public Query(Map<String, Object> params){
this.putAll(params);
//分页参数
this.page = Integer.parseInt(params.get("page").toString());
this.limit = Integer.parseInt(params.get("limit").toString());
this.put("offset", (page - 1) * limit);
this.put("page", page);
this.put("limit", limit);
}
public int getPage() {
return page;
}
public void setPage(int page) {
this.page = page;
}
public int getLimit() {
return limit;
}
public void setLimit(int limit) {
this.limit = limit;
}
}
异常工具类
package io.renren.utils;
/**
* 自定义异常
*
* @author chenshun
* @email sunlightcs@gmail.com
* @date 2016年10月27日 下午10:11:27
*/
public class RRException extends RuntimeException {
private static final long serialVersionUID = 1L;
private String msg;
private int code = 500;
public RRException(String msg) {
super(msg);
this.msg = msg;
}
public RRException(String msg, Throwable e) {
super(msg, e);
this.msg = msg;
}
public RRException(String msg, int code) {
super(msg);
this.msg = msg;
this.code = code;
}
public RRException(String msg, int code, Throwable e) {
super(msg, e);
this.msg = msg;
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
}
日期操作工具类
/**
* Copyright 2018 人人开源 http://www.renren.io
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package io.renren.common.utils;
import org.apache.commons.lang.StringUtils;
import org.joda.time.DateTime;
import org.joda.time.LocalDate;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
* 日期处理
*
* @author chenshun
* @email sunlightcs@gmail.com
* @date 2016年12月21日 下午12:53:33
*/
public class DateUtils {
/** 时间格式(yyyy-MM-dd) */
public final static String DATE_PATTERN = "yyyy-MM-dd";
/** 时间格式(yyyy-MM-dd HH:mm:ss) */
public final static String DATE_TIME_PATTERN = "yyyy-MM-dd HH:mm:ss";
/**
* 日期格式化 日期格式为：yyyy-MM-dd
* @param date 日期
* @return 返回yyyy-MM-dd格式日期
*/
public static String format(Date date) {
return format(date, DATE_PATTERN);
}
/**
* 日期格式化 日期格式为：yyyy-MM-dd
* @param date 日期
* @param pattern 格式，如：DateUtils.DATE_TIME_PATTERN
* @return 返回yyyy-MM-dd格式日期
*/
public static String format(Date date, String pattern) {
if(date != null){
SimpleDateFormat df = new SimpleDateFormat(pattern);
return df.format(date);
}
return null;
}
/**
* 字符串转换成日期
* @param strDate 日期字符串
* @param pattern 日期的格式，如：DateUtils.DATE_TIME_PATTERN
*/
public static Date stringToDate(String strDate, String pattern) {
if (StringUtils.isBlank(strDate)){
return null;
}
DateTimeFormatter fmt = DateTimeFormat.forPattern(pattern);
return fmt.parseLocalDateTime(strDate).toDate();
}
/**
* 根据周数，获取开始日期、结束日期
* @param week 周期 0本周，-1上周，-2上上周，1下周，2下下周
* @return 返回date[0]开始日期、date[1]结束日期
*/
public static Date[] getWeekStartAndEnd(int week) {
DateTime dateTime = new DateTime();
LocalDate date = new LocalDate(dateTime.plusWeeks(week));
date = date.dayOfWeek().withMinimumValue();
Date beginDate = date.toDate();
Date endDate = date.plusDays(6).toDate();
return new Date[]{beginDate, endDate};
}
/**
* 对日期的【秒】进行加/减
*
* @param date 日期
* @param seconds 秒数，负数为减
* @return 加/减几秒后的日期
*/
public static Date addDateSeconds(Date date, int seconds) {
DateTime dateTime = new DateTime(date);
return dateTime.plusSeconds(seconds).toDate();
}
/**
* 对日期的【分钟】进行加/减
*
* @param date 日期
* @param minutes 分钟数，负数为减
* @return 加/减几分钟后的日期
*/
public static Date addDateMinutes(Date date, int minutes) {
DateTime dateTime = new DateTime(date);
return dateTime.plusMinutes(minutes).toDate();
}
/**
* 对日期的【小时】进行加/减
*
* @param date 日期
* @param hours 小时数，负数为减
* @return 加/减几小时后的日期
*/
public static Date addDateHours(Date date, int hours) {
DateTime dateTime = new DateTime(date);
return dateTime.plusHours(hours).toDate();
}
/**
* 对日期的【天】进行加/减
*
* @param date 日期
* @param days 天数，负数为减
* @return 加/减几天后的日期
*/
public static Date addDateDays(Date date, int days) {
DateTime dateTime = new DateTime(date);
return dateTime.plusDays(days).toDate();
}
/**
* 对日期的【周】进行加/减
*
* @param date 日期
* @param weeks 周数，负数为减
* @return 加/减几周后的日期
*/
public static Date addDateWeeks(Date date, int weeks) {
DateTime dateTime = new DateTime(date);
return dateTime.plusWeeks(weeks).toDate();
}
/**
* 对日期的【月】进行加/减
*
* @param date 日期
* @param months 月数，负数为减
* @return 加/减几月后的日期
*/
public static Date addDateMonths(Date date, int months) {
DateTime dateTime = new DateTime(date);
return dateTime.plusMonths(months).toDate();
}
/**
* 对日期的【年】进行加/减
*
* @param date 日期
* @param years 年数，负数为减
* @return 加/减几年后的日期
*/
public static Date addDateYears(Date date, int years) {
DateTime dateTime = new DateTime(date);
return dateTime.plusYears(years).toDate();
}
}
ip地址获取工具类
/**
* Copyright 2018 人人开源 http://www.renren.io
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package io.renren.common.utils;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.http.HttpServletRequest;
/**
* IP地址
*
* @author chenshun
* @email sunlightcs@gmail.com
* @date 2017年3月8日 下午12:57:02
*/
public class IPUtils {
private static Logger logger = LoggerFactory.getLogger(IPUtils.class);
/**
* 获取IP地址
*
* 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
* 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
*/
public static String getIpAddr(HttpServletRequest request) {
String ip = null;
try {
ip = request.getHeader("x-forwarded-for");
if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("Proxy-Client-IP");
}
if (StringUtils.isEmpty(ip) || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("WL-Proxy-Client-IP");
}
if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("HTTP_CLIENT_IP");
}
if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("HTTP_X_FORWARDED_FOR");
}
if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
}
} catch (Exception e) {
logger.error("IPUtils ERROR ", e);
}
// //使用代理，则获取第一个IP地址
// if(StringUtils.isEmpty(ip) && ip.length() > 15) {
// if(ip.indexOf(",") > 0) {
// ip = ip.substring(0, ip.indexOf(","));
// }
// }
return ip;
}
}
redis工具类
/**
* Copyright 2018 人人开源 http://www.renren.io
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package io.renren.common.utils;
import com.alibaba.fastjson.JSON;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.*;
import org.springframework.stereotype.Component;
import javax.annotation.Resource;
import java.util.concurrent.TimeUnit;
/**
* Redis工具类
*
* @author chenshun
* @email sunlightcs@gmail.com
* @date 2017-07-17 21:12
*/
@Component
public class RedisUtils {
@Autowired
private RedisTemplate redisTemplate;
@Resource(name="redisTemplate")
private ValueOperations<String, String> valueOperations;
@Resource(name="redisTemplate")
private HashOperations<String, String, Object> hashOperations;
@Resource(name="redisTemplate")
private ListOperations<String, Object> listOperations;
@Resource(name="redisTemplate")
private SetOperations<String, Object> setOperations;
@Resource(name="redisTemplate")
private ZSetOperations<String, Object> zSetOperations;
/** 默认过期时长，单位：秒 */
public final static long DEFAULT_EXPIRE = 60 * 60 * 24;
/** 不设置过期时长 */
public final static long NOT_EXPIRE = -1;
public void set(String key, Object value, long expire){
valueOperations.set(key, toJson(value));
if(expire != NOT_EXPIRE){
redisTemplate.expire(key, expire, TimeUnit.SECONDS);
}
}
public void set(String key, Object value){
set(key, value, DEFAULT_EXPIRE);
}
public <T> T get(String key, Class<T> clazz, long expire) {
String value = valueOperations.get(key);
if(expire != NOT_EXPIRE){
redisTemplate.expire(key, expire, TimeUnit.SECONDS);
}
return value == null ? null : fromJson(value, clazz);
}
public <T> T get(String key, Class<T> clazz) {
return get(key, clazz, NOT_EXPIRE);
}
public String get(String key, long expire) {
String value = valueOperations.get(key);
if(expire != NOT_EXPIRE){
redisTemplate.expire(key, expire, TimeUnit.SECONDS);
}
return value;
}
public String get(String key) {
return get(key, NOT_EXPIRE);
}
public void delete(String key) {
redisTemplate.delete(key);
}
/**
* Object转成JSON数据
*/
private String toJson(Object object){
if(object instanceof Integer || object instanceof Long || object instanceof Float ||
object instanceof Double || object instanceof Boolean || object instanceof String){
return String.valueOf(object);
}
return JSON.toJSONString(object);
}
/**
* JSON数据，转成Object
*/
private <T> T fromJson(String json, Class<T> clazz){
return JSON.parseObject(json, clazz);
}
}
Spring Context 工具类
/**
* Copyright 2018 人人开源 http://www.renren.io
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package io.renren.common.utils;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
/**
* Spring Context 工具类
*
* @author chenshun
* @email sunlightcs@gmail.com
* @date 2016年11月29日 下午11:45:51
*/
@Component
public class SpringContextUtils implements ApplicationContextAware {
public static ApplicationContext applicationContext;
@Override
public void setApplicationContext(ApplicationContext applicationContext)
throws BeansException {
SpringContextUtils.applicationContext = applicationContext;
}
public static Object getBean(String name) {
return applicationContext.getBean(name);
}
public static <T> T getBean(String name, Class<T> requiredType) {
return applicationContext.getBean(name, requiredType);
}
public static boolean containsBean(String name) {
return applicationContext.containsBean(name);
}
public static boolean isSingleton(String name) {
return applicationContext.isSingleton(name);
}
public static Class<? extends Object> getType(String name) {
return applicationContext.getType(name);
}
}
返回数据工具类
/**
* Copyright 2018 人人开源 http://www.renren.io
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package io.renren.common.utils;
import java.util.HashMap;
import java.util.Map;
/**
* 返回数据
*
* @author chenshun
* @email sunlightcs@gmail.com
* @date 2016年10月27日 下午9:59:27
*/
public class R extends HashMap<String, Object> {
private static final long serialVersionUID = 1L;
public R() {
put("code", 0);
put("msg", "success");
}
public static R error() {
return error(500, "未知异常，请联系管理员");
}
public static R error(String msg) {
return error(500, msg);
}
public static R error(int code, String msg) {
R r = new R();
r.put("code", code);
r.put("msg", msg);
return r;
}
public static R ok(String msg) {
R r = new R();
r.put("msg", msg);
return r;
}
public static R ok(Map<String, Object> map) {
R r = new R();
r.putAll(map);
return r;
}
public static R ok() {
return new R();
}
@Override
public R put(String key, Object value) {
super.put(key, value);
return this;
}
}
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