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java常用工具類有哪些

這篇文章給大家分享的是有關(guān)java常用工具類有哪些的內(nèi)容。小編覺得挺實用的，因此分享給大家做個參考，一起跟隨小編過來看看吧。

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java中有用的工具集

任何語言都要處理日期，map類型，字符串，數(shù)字類型的數(shù)據(jù)，這里找到一些用java經(jīng)常處理這些數(shù)據(jù)的常用工具類，以便參考
一 VO工具集
package com.sds.faro.common.util;

import java.io.UnsupportedEncodingException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;

public class VoUtil {

 /**
  * Map? VO? ?????? ???( Vo Class? Method-Argument-Type? ???? Map? ??? ???(Cast) ??.
  * non-enoding
  * @param map
  * @param objClass VO Class
  * @return
  */
 public static Object convertMapToObject(Map<?, ?> map, Object objClass) {
  return convertMapToObject(map, objClass, false);
 }

 /**
  * Map? VO? ?????? ???( Vo Class? Method-Argument-Type? ???? Map? ??? ???(Cast) ??.
  * @param map
  * @param objClass VO Class
  * @param encoding ( convert 8859_1 -> UTF-8 )
  * @return
  */
 public static Object convertMapToObject(Map<?, ?> map, Object objClass, boolean encoding) {
  
  if(map==null) return null;
  
  String keyAttribute = null;
  String setMethodString = "set";
  String methodString = null;
  Iterator<?> itr = map.keySet().iterator();
  while (itr.hasNext()) {
   keyAttribute = (String) itr.next();
   if(keyAttribute.length()<1) {
    continue;
   }
   methodString = setMethodString
     + keyAttribute.substring(0, 1).toUpperCase()
     + keyAttribute.substring(1);
   try {
    Method[] methods = objClass.getClass().getDeclaredMethods();
    Class<?> methodType = null;
    for (int i = 0; i <= methods.length - 1; i++) {
     if (methodString.equals(methods[i].getName())) {

      Object paramValue = "";
      methodType = methods[i].getParameterTypes()[0];
/*
      paramValue = map.get(keyAttribute);

      System.out.println("methodString : ["+ methodString +"]"
         +" / methods[i].getParameterTypes()[0].getName() : ["+ methods[i].getParameterTypes()[0].getName() +"]"
         +" / keyAttribute : ["+ keyAttribute +"]"
         +" / paramValue : ["+ (paramValue!=null? paramValue.toString():null) +"]"
         +" / map.get(keyAttribute) : ["+ map.get(keyAttribute) +"]");
*/

      if(map.get(keyAttribute) instanceof String[]){
       String[] paramValueArr = (String[]) (map.get(keyAttribute));
       paramValue = paramValueArr[0];
       if(encoding)
        paramValue = new String(((String)paramValue).getBytes("8859_1"), "utf-8");
      }
      else if(map.get(keyAttribute) instanceof String){
       paramValue = (String)(map.get(keyAttribute));
       if(encoding)
        paramValue = new String(((String)paramValue).getBytes("8859_1"), "utf-8");
      }
      else if(map.get(keyAttribute) instanceof Integer){
       paramValue = (Integer)(map.get(keyAttribute));
      }
      else if(map.get(keyAttribute) instanceof Long){
       paramValue = (Long)(map.get(keyAttribute));
      }
      else if(map.get(keyAttribute) instanceof Float){
       paramValue = (Float)(map.get(keyAttribute));
      }
      else if(map.get(keyAttribute) instanceof Double){
       paramValue = (Double)(map.get(keyAttribute));
      }
      else if(map.get(keyAttribute) instanceof Boolean){
       paramValue = (String)(map.get(keyAttribute));
      }
      else {
       paramValue = (String)(map.get(keyAttribute));
      }

      if(methodType.equals(String.class)){
       String theType = "java.lang.String";
       Class<? extends String> castClass = Class.forName(theType).asSubclass(String.class);
       if(encoding) {
        paramValue = new String(((String)paramValue).getBytes("8859_1"), "utf-8");
       }

       String obj = null;
       if(paramValue != null && !paramValue.toString().equals("")){
        obj = castClass.cast(paramValue.toString());
       }else{
        obj = null;
       }
       methods[i].invoke(objClass, obj);
      }
      else if(methodType.equals(int.class) || methodType.equals(Integer.class)){
       String theType = "java.lang.Number";
       Class<? extends Number> castClass = Class.forName(theType).asSubclass(Number.class);

       Number obj = null;
       if(paramValue != null && !paramValue.toString().equals("")){
        obj = castClass.cast(Integer.parseInt(paramValue.toString().replaceAll(",","")));
       }else{
        obj = new Integer(0);
       }
       methods[i].invoke(objClass, obj);

      }
      else if(methodType.equals(long.class) || methodType.equals(Long.class)){
       String theType = "java.lang.Long";
       Class<? extends Long> castClass = Class.forName(theType).asSubclass(Long.class);
       
       Long obj = null;
       if(paramValue != null && !paramValue.toString().equals("")){
        obj = castClass.cast(Long.parseLong(paramValue.toString().replaceAll(",","")));
       }else{
        obj = new Long(0);
       }
       methods[i].invoke(objClass, obj);
       
      }
      else if(methodType.equals(float.class) || methodType.equals(Float.class)){
       String theType = "java.lang.Float";
       Class<? extends Float> castClass = Class.forName(theType).asSubclass(Float.class);
       
       float obj = 0;
       if(paramValue != null && !paramValue.toString().equals("")){
        obj = castClass.cast(Float.parseFloat(paramValue.toString().replaceAll(",","")));
       }else{
        obj = new Float(0);
       }
       methods[i].invoke(objClass, obj);
       
      }
      else if(methodType.equals(double.class) || methodType.equals(Double.class)){
       String theType = "java.lang.Double";
       Class<? extends Double> castClass = Class.forName(theType).asSubclass(Double.class);
       
       double obj = 0;
       if(paramValue != null && !paramValue.toString().equals("")){
        obj = castClass.cast(Double.parseDouble(paramValue.toString().replaceAll(",","")));
       }else{
        obj = new Double(0);
       }
       methods[i].invoke(objClass, obj);
       
      }
      else if(methodType.equals(Date.class)){
       String theType = "java.util.Date";
       Class<? extends Date> castClass = Class.forName(theType).asSubclass(Date.class);

       Date obj = null;
       if(paramValue != null && !paramValue.toString().equals("")){
        obj = castClass.cast(DateUtil.getDateForJson(paramValue.toString()));
       }else{
        obj = null;
       }
       methods[i].invoke(objClass, obj);
      }
      else if(methodType.equals(boolean.class) || methodType.equals(Boolean.class)){
       String theType = "java.lang.Boolean";
       Class<? extends String> castClass = Class.forName(theType).asSubclass(String.class);
       
       String obj = null;
       if(paramValue != null && !paramValue.toString().equals("")){
              if(((String)paramValue).equalsIgnoreCase("false")) {
               obj = castClass.cast(Boolean.FALSE);
              }
              else if(((String)paramValue).equalsIgnoreCase("true")) {
               obj = castClass.cast(Boolean.TRUE);
              }
              else {
               obj = null;
              }
       }else{
        obj = null;
       }
       methods[i].invoke(objClass, obj);
      }
      else{
       //System.out.println("fail cast - methodString : ["+ methodString +"] / methods[i].getParameterTypes()[0].getName() : ["+ methods[i].getParameterTypes()[0].getName() +"]");
       //System.out.println("fail cast - paramValue [" + paramValue +"]");
       methods[i].invoke(objClass, paramValue);
      }


     }
    }
   } catch (SecurityException e) {
    e.printStackTrace();
   } catch (IllegalAccessException e) {
    e.printStackTrace();
   } catch (IllegalArgumentException e) {
    e.printStackTrace();
   } catch (InvocationTargetException e) {
    e.printStackTrace();
   } catch (UnsupportedEncodingException e) {
    e.printStackTrace();
   } catch (ClassNotFoundException e) {
    e.printStackTrace();
   }
  }
  return objClass;
 }
}

使用方法
想要接收前臺傳來的list 里面存的是對象，后臺用list接收，list里存的時Map
這時需要把后臺list里的map轉(zhuǎn)換成對象，因此用到vo工具轉(zhuǎn)換map為對象方法
@RequestBody Map<String, Object> reqParam 傳過來的參數(shù)
List<Map<String, Object>> saveMdEmlMngVoList = (List<Map<String, Object>>) reqParam.get("reqListData");
for(int i=0; saveMdEmlMngVoList!=null && i<saveMdEmlMngVoList.size(); i++) {
 MdEmlMngVo saveVo = (MdEmlMngVo)VoUtil.convertMapToObject((Map<String, Object>)saveMdEmlMngVoList.get(i), new MdEmlMngVo(), false);
}

二 日期工具集
package com.sds.faro.common.util;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

import com.google.common.base.Strings;
import com.sds.faro.common.session.FaroUserSessionHolder;

public class DateUtil {
 
 private DateUtil(){
 }
 
 /**
  * Date?? ???? ? ????? ??? String??? ??? ?? ???
  *
  * @param date
  * @return string (com.sds.faro.common.util.FaroConstants.DEFAULT_DATETIME_FORMAT ??)
  */
 public static String getDateTimeString(final Date date) {
  return getString(date, FaroConstants.DEFAULT_DATETIME_FORMAT);
 }
 
 /**
  * Date?? ????? ??? String??? ??? ?? ???
  *
  * @param date
  * @return string (com.sds.faro.common.util.FaroConstants.DEFAULT_DATE_FORMAT ??)
  */
 public static String getDateString(final Date date) {
  return getString(date, FaroConstants.DEFAULT_DATE_FORMAT);
 }
 
 public static String getString(final Date date, final String format){
  if(date == null){
   return null;
  }

  DateFormat dtFormat = new SimpleDateFormat(format);
  dtFormat.setTimeZone(getTimeZone());
  return dtFormat.format(date);
 }
 
 /**
  * ???? String?? ?? Date? ?????
  * ?? ??? ???? 0?? ??? ?? ???? ???
  *
  * @param dateString
  * @return date (?? ??? 0?0?0?)
  */
 public static Date getStartDate(final String dateString){
  
  Calendar cal = getCalendar(dateString);
  if(cal == null){
   return null;
  }
  
  cal.set(Calendar.HOUR_OF_DAY, 0);
  cal.set(Calendar.MINUTE, 0);
  cal.set(Calendar.SECOND, 0);
  cal.set(Calendar.MILLISECOND, 0);
  return cal.getTime();
 }

 /**
  * ???? String?? ?? Date? ?????
  * ?? ??? 23?59?59??? ??? ?? ???? ??? 
  * @param dateString
  * @return date (?? ??? 23?59?59?)
  */
 public static Date getEndDate(final String dateString){
  
  Calendar cal = getCalendar(dateString);
  if(cal == null){
   return null;
  }
  
  cal.set(Calendar.HOUR_OF_DAY, 23);
  cal.set(Calendar.MINUTE, 59);
  cal.set(Calendar.SECOND, 59);
  cal.set(Calendar.MILLISECOND, 999);
  return cal.getTime();
 }
 
 /**
  * ???? ?? ??? String ?? ?? Date? ????? ???? ???
  * @param datetimeString
  * @return date
  */
 public static Date getDate(final String datetimeString) {
  final Calendar cal = getCalendar(datetimeString, FaroConstants.DEFAULT_DATETIME_FORMAT);
  if (cal == null) {
   return null;
  }

  return cal.getTime();
 }
 
 /**
  * ???? ?? ??? String ?? ?? Date? ????? ???? ???
  * 8 or 10 Byte???, (-, /)? ???? ????? Date? ????.
  * jqxGrid? yyyy-MM-dd'T'HH:mm:ss.SSS'Z'?? ???? ???? TimeZone(GMT0) ???? Date? ????.
  * @param datetimeString
  * @return date
  */
 public static Date getDateForJson(final String datetimeString) {
  Calendar cal = null;
  if(datetimeString.length()==8 || datetimeString.length()==10) {
   cal = getCalendar(datetimeString.replaceAll("-", "").replaceAll("/", ""), "yyyyMMdd");
  }
  else {
   cal = getCalendar(datetimeString, FaroConstants.DEFAULT_DATETIME_FORMAT_JSON);
  }

  if (cal == null) {
   return null;
  }

  return cal.getTime();
 }
 
 private static Calendar getCalendar(final String dateString, final String format) {
  if(Strings.isNullOrEmpty(dateString)){
   return null;
  }
  TimeZone tz = getTimeZone();
  // jqxGrid? DateWidget? ???? ?? GMT0? ??? ???? ???? ??
  if(format.equals(FaroConstants.DEFAULT_DATETIME_FORMAT_JSON)) {
   tz = TimeZone.getTimeZone("GMT0");
  }
  SimpleDateFormat sdf = new SimpleDateFormat(format);
  sdf.setTimeZone(tz);
  sdf.setLenient(false);
  
  Date outputDate = null;
  try {
   outputDate = sdf.parse(dateString);
  } catch (ParseException e) {
   return null;
  }
  
  Calendar cal = Calendar.getInstance(tz);
  cal.setTime(outputDate);
  return cal;
 }

 private static Calendar getCalendar(final String dateString) {
  return getCalendar(dateString, FaroConstants.DEFAULT_DATE_FORMAT);
 }

 private static TimeZone getTimeZone() {
  if(FaroUserSessionHolder.getTimeZoneId()==null) {
   return TimeZone.getDefault();
  }
  else {
   return TimeZone.getTimeZone(FaroUserSessionHolder.getTimeZoneId());
  }
  
 }
 
 public static void main(String args[]) {
  
  String datetimeString = "2017-04-15T03:30:40.577Z";
  
  System.out.println(TimeZone.getTimeZone(""));
  System.out.println(TimeZone.getTimeZone("GMT0"));
  System.out.println(TimeZone.getTimeZone("Asia/Shanghai"));
  System.out.println(TimeZone.getTimeZone("UTC"));
  
  System.out.println( DateUtil.getDateForJson(datetimeString) );
  
  
 }
 
}
這個工具集可以處理yyyy-mm-dd的數(shù)據(jù)
如果查詢時只傳入沒有時間的日期數(shù)據(jù)，做搜索條件，可能造成查詢的時候，結(jié)束日期只小于 yyyy-mm-dd 00:00:00 而實際想要的效果是
yyyy-MM-dd 23:59:59 這樣就可以用這個工具的函數(shù)自動給日期數(shù)據(jù)加上一天的最后一分鐘

感謝各位的閱讀！關(guān)于“java常用工具類有哪些”這篇文章就分享到這里了，希望以上內(nèi)容可以對大家有一定的幫助，讓大家可以學到更多知識，如果覺得文章不錯，可以把它分享出去讓更多的人看到吧！

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