Commons-lang API介绍

4.1 Commons-lang API介绍

4.1.1 StringUtils

4.1.2 StringEscapeUtils

4.1.3 ArrayUtils

4.1.4 DateUtils

4.1.5 DateFormatUtils

4.1.6 RandomUtils

4.1.7 NumberUtils

4.1.8 FieldUtils

4.1.9 CharUtils

4.1.10 BooleanUtils

  4.1.11 ExceptionUtils

1    StringUtils方法介绍

StringUtils是提供字符串操作的工具类。提供的方法如下：

1 public static boolean isEmpty(String str);

说明：

如果参数str为NULL或者str.length() == 0 返回true

对比：JDK 中类String的方法public boolean isEmpty()

此方法通过判断私有变量count是否等于0来进行判断。

StringUtils.isEmpty(null) = true

StringUtils.isEmpty("") = true

StringUtils.isEmpty(" ") = false

StringUtils.isEmpty("        ")  = false

StringUtils.isEmpty("aa") = false

StringUtils.isEmpty(" aaa ") = false

2 public static boolean isNotEmpty(String str)

说明：

判断给定参数是否不为空，其实现方式利用了方法一： !isEmpty(str);

对比：JDK中String类无此方法。

StringUtils.isNotEmpty(null);//false  
StringUtils.isNotEmpty("");//false  
StringUtils.isNotEmpty(" ");//true  
StringUtils.isNotEmpty("         ");//true  
StringUtils.isNotEmpty("aa");//true  
StringUtils.isNotEmpty(" aaa ");//true

3  public static boolean isBlank(String str)；

说明：

如果参数str为NULL或者其长度等于0，又或者其由空格组成，那么此方法都返回true。

对比：JDK中String类无此方法。

System.out.println(StringUtils.isBlank(null));//true
System.out.println(StringUtils.isBlank(""));//true
System.out.println(StringUtils.isBlank(" "));//true
System.out.println(StringUtils.isBlank("   "));//true
System.out.println(StringUtils.isBlank("\n\t"));//true
System.out.println(StringUtils.isBlank("aaa"));//false
System.out.println(StringUtils.isBlank(" aa "));//false

4  public static boolean isNotBlank(String str)；

说明：利用方法三实现。 

5 public static String
trim(String str)；

说明：

去除字符串开头和结尾处的空格字符。如果参数str为null,则返回null.

对比：

利用JDK中String类的trim()方法。

//去空格.Null返回null~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
System.out.println(StringUtils.trim(null));

//去空格，将Null和"" 转换为Null
System.out.println(StringUtils.trimToNull(""));
//去空格，将NULL 和 "" 转换为""
System.out.println(StringUtils.trimToEmpty(null));

6 public static String
stripStart(String str, String stripChars)；

说明：

去掉str前端的在stripChars中的字符

//如果第二个参数为null只去前面空格(否则去掉字符串前面一样的字符，到不一样为止)
System.out.println(StringUtils.stripStart("ddsuuu ", "d"));

 

7 public static String
stripEnd(String str, String stripChars)；

说明：

去掉str末端的在stripChars中的字符

//如果第二个参数为null只去后面空格，(否则去掉字符串后面一样的字符，到不一样为止)
System.out.println(StringUtils.stripEnd("dabads", "das"));

//如果第二个参数为null去空格(否则去掉字符串2边一样的字符，到不一样为止)
System.out.println(StringUtils.strip("fsfsdf", "f"));

//检查是否查到，返回boolean,null返回假
System.out.println(StringUtils.contains("sdf", "dg"));
//检查是否查到，返回boolean,null返回假,不区分大小写
System.out.println(StringUtils.containsIgnoreCase("sdf", "D"));
//检查是否有含有空格,返回boolean
System.out.println(StringUtils.containsWhitespace(" d"));

8 public static int ordinalIndexOf(String
str, String searchStr, int ordinal)

说明：

返回字符串search在字符串str中第ordinal次出现的位置。

如果str=null或searchStr=null或ordinal<=0则返回-1.

//从指定位置(三参数)开始查找，本例从第2个字符开始查找k字符
System.out.println(StringUtils.indexOf("akfekcd中华", "k", 2));
//未发现不同之处
System.out.println(StringUtils.ordinalIndexOf("akfekcd中华", "k", 2));

9. StringUtils.defaultIfEmpty(String
str, String defalutValue)

如果字符串为""或者 null 则替换成参数2中的字符串：

System.out.println("1:
" + StringUtils.defaultIfEmpty("", "a"));//1: a

System.out.println("2: " + StringUtils.defaultIfEmpty("\n\t", "a"));//2: 
System.out.println("3: " + StringUtils.defaultIfEmpty("", "a"));//3: a
System.out.println("4: " + StringUtils.defaultIfEmpty("   ", "a"));//4:    
System.out.println("5: " + StringUtils.defaultIfEmpty("aaa", "a"));//5: aaa
System.out.println("6: " + StringUtils.defaultIfEmpty(" aaa ", "a"));//6:  aaa 
System.out.println("7: " + StringUtils.defaultIfEmpty(null, "a"));//7: a

10.  StringUtils.defaultString(String
str, String defaultValue)

和9相似：

System.out.println("1: " + StringUtils.defaultString(null, "a"));//1: a
System.out.println("2: " + StringUtils.defaultString("", "a"));//2: 
System.out.println("3: " + StringUtils.defaultString(" ", "a"));//3:  
System.out.println("4: " + StringUtils.defaultString("\n\t", "a"));//4: 
System.out.println("5: " + StringUtils.defaultString("aa", "a"));//5: aa
System.out.println("6: " + StringUtils.defaultString(" aaa", "a"));//6:  aaa

11. StringUtils.capitalize(String
str)

首字母大写

System.out.println(StringUtils.capitalize("xxxx"));//Xxxx

System.out.println(StringUtils.capitalize("Xxxx"));//Xxxx

12. StringUtils.remove(String
str, String removeStr)

从str中去除removeStr

System.out.println(StringUtils.remove("abcd", "ab"));//cd
System.out.println(StringUtils.remove("abcd", "ad"));//abcd

13. StringUtils.countMatches(String
str, String find)

计算字符串在另一个字符串中出现的次数：

int nCount = StringUtils.countMatches("UPDATE tb_table SET xx=?,xyz=?, sss=? WHERE id=?", "?");//nCount
= 4

http://www.cnblogs.com/jifeng/archive/2012/08/05/2623767.html

---

4.1.2 StringEscapeUtils

StringEscapeUtils这个类里提供了很多转义的方法，比如可以转成json、xml、html等格式。

1.escapeJava/unescapeJava 把字符串转为unicode编码

package com.kungeek.tip;

import org.apache.commons.lang.StringEscapeUtils;

public class test {

    public static void main(String args[]) {
        String sql = "1' or '1'='1";
        // 防SQL注入 防SQL注入:1'' or ''1''=''1
        System.out.println("防SQL注入:" + StringEscapeUtils.escapeSql(sql));

        // 转义成Unicode编码 转成Unicode编码：\u9648\u78CA\u5174
        String unicode="陈磊兴";
        String esc_unicode=StringEscapeUtils.escapeJava(unicode);
        String unesc_unicode=StringEscapeUtils.unescapeJava(esc_unicode);
        System.out.println("转成Unicode编码：" + esc_unicode);
        System.out.println("反转成Unicode编码：" + unesc_unicode);

        String html="<font>chen磊  xing</font>";
        String esc_html=StringEscapeUtils.escapeHtml(html);
        String unesc_html=StringEscapeUtils.unescapeHtml(esc_html);
        // 转义HTML
        System.out.println("转义HTML:" + esc_html);
        // 反转义HTML
        System.out.println("反转义HTML:" + unesc_html);

        String xml="<name>陈磊兴</name>";
        String esc_xml=StringEscapeUtils.escapeHtml(xml);
        String unesc_xml=StringEscapeUtils.unescapeXml(esc_xml);
        // 转义xml 转义XML：
        System.out.println("转义XML：" + esc_xml);
        // 转义xml 反转义XML：
        System.out.println("反转义XML：" +unesc_xml );

    }

}

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" alt="" />

---

4.1.3 ArrayUtils

package chongqingyusp;

import java.util.Map;

import org.apache.commons.lang.ArrayUtils;

public class test {

    public static void main(String[] args) {

        // 1.打印数组
        String a=ArrayUtils.toString(new int[] { 1,4, 2, 3 });// {1,4,2,3}
        String a1=ArrayUtils.toString(new Integer[] { 1, 4, 2, 3 });// {1,4,2,3}
        String a2=ArrayUtils.toString(null, "I'm nothing!");// I'm nothing!

        System.out.println("a----------"+a);
        System.out.println("a1----------"+a1);
        System.out.println("a2----------"+a2);
        System.out.println("-----------------------------------------");
        // 2.判断两个数组是否相等,采用EqualsBuilder进行判断
        // 只有当两个数组的数据类型,长度,数值顺序都相同的时候,该方法才会返回True
        // 2.1 两个数组完全相同
        boolean b=ArrayUtils.isEquals(new int[] { 1, 2, 3 }, new int[] { 1, 2, 3 });// true
        // 2.2 数据类型以及长度相同,但各个Index上的数据不是一一对应
        boolean b1=ArrayUtils.isEquals(new int[] { 1, 3, 2 }, new int[] { 1, 2, 3 });//false
        // 2.3 数组的长度不一致
        boolean b2=ArrayUtils.isEquals(new int[] { 1, 2, 3, 3 }, new int[] { 1, 2, 3 });//false
        // 2.4 不同的数据类型
        boolean b3=ArrayUtils.isEquals(new int[] { 1, 2, 3 }, new long[] { 1, 2, 3 });// false
        boolean b4=ArrayUtils.isEquals(new Object[] { 1, 2, 3 }, new Object[] { 1, (long) 2, 3 });// false
        // 2.5 Null处理,如果输入的两个数组都为null时候则返回true
        boolean b5=ArrayUtils.isEquals(new int[] { 1, 2, 3 }, null);// false
        boolean b6=ArrayUtils.isEquals(null, null);// true

        System.out.println("b----------"+b);
        System.out.println("b1----------"+b1);
        System.out.println("b2----------"+b2);
        System.out.println("b3----------"+b3);
        System.out.println("b4----------"+b4);
        System.out.println("b5----------"+b5);
        System.out.println("b6----------"+b6);
        System.out.println("-----------------------------------------");

        // 3.将一个数组转换成Map
        // 如果数组里是Entry则其Key与Value就是新Map的Key和Value,如果是Object[]则Object[0]为KeyObject[1]为Value
        // 对于Object[]数组里的元素必须是instanceof Object[]或者Entry,即不支持基本数据类型数组
        // 如:ArrayUtils.toMap(new Object[]{new int[]{1,2},new int[]{3,4}})会出异常
        Map c=ArrayUtils.toMap(new Object[] { new Object[] { 1, 2 }, new Object[] { 3, 4 } });// {1=2,
        // 3=4}
        Map c1=ArrayUtils.toMap(new Integer[][] { new Integer[] { 1, 2 }, new Integer[] { 3, 4 } });// {1=2,
        // 3=4}

        System.out.println("c----------"+c);
        System.out.println("c1----------"+c1);
        System.out.println("-----------------------------------------");

        // 4.拷贝数组
        int[] d=ArrayUtils.clone(new int[] { 3, 2, 4 });// {3,2,4}
        System.out.println("d----------"+ArrayUtils.toString(d));
        System.out.println("-----------------------------------------");

        // 5.截取数组
        int[] e=ArrayUtils.subarray(new int[] { 3, 4, 1, 5, 6 }, 2, 4);// {1,5}
        System.out.println("e----------"+ArrayUtils.toString(e));
        // 起始index为2(即第三个数据)结束index为4的数组
        int[] e1=ArrayUtils.subarray(new int[] { 3, 4, 1, 5, 6 }, 2, 10);// {1,5,6}
        // 如果endIndex大于数组的长度,则取beginIndex之后的所有数据
        System.out.println("e1----------"+ArrayUtils.toString(e1));
        System.out.println("-----------------------------------------");

        // 6.判断两个数组的长度是否相等
        boolean f=ArrayUtils.isSameLength(new Integer[] { 1, 3, 5 }, new Long[] { 2L, 8L, 10L });// true
        System.out.println("f----------"+f);
        System.out.println("-----------------------------------------");

        // 7.获得数组的长度
        int g=ArrayUtils.getLength(new long[] { 1, 23, 3 });//
        System.out.println("g----------"+g);
        System.out.println("-----------------------------------------");

        // 8.判段两个数组的类型是否相同
        boolean h=ArrayUtils.isSameType(new long[] { 1, 3 }, new long[] { 8, 5, 6 });// true
        boolean h1=ArrayUtils.isSameType(new int[] { 1, 3 }, new long[] { 8, 5, 6 });// false
        System.out.println("h----------"+h);
        System.out.println("h----------"+h1);
        System.out.println("-----------------------------------------");

        // 9.数组反转
        int[] array =new int[] { 1, 2, 5 };
        ArrayUtils.reverse(array);// {5,2,1}
        System.out.println("i----------"+ArrayUtils.toString(array));
        System.out.println("-----------------------------------------");

        // 10.查询某个Object在数组中的位置,可以指定起始搜索位置,找不到返回-1
        // 10.1 从正序开始搜索,搜到就返回当前的index否则返回-1
        int j=ArrayUtils.indexOf(new int[] { 1, 3, 6 }, 6);//
        int j1=ArrayUtils.indexOf(new int[] { 1, 3, 6 }, 2);// -1
        // 10.2 从逆序开始搜索,搜到就返回当前的index否则返回-1
        int j2=ArrayUtils.lastIndexOf(new int[] { 1, 3, 6 }, 6);//

        System.out.println("j----------"+ArrayUtils.toString(j));
        System.out.println("j1----------"+ArrayUtils.toString(j1));
        System.out.println("j2----------"+ArrayUtils.toString(j2));
        System.out.println("-----------------------------------------");

        // 11.查询某个Object是否在数组中
        boolean k=ArrayUtils.contains(new int[] { 3, 1, 2 }, 1);// true
        // 对于Object数据是调用该Object.equals方法进行判断
        boolean k1=ArrayUtils.contains(new Object[] { 3, 1, 2 }, 1L);// false
        System.out.println("k----------"+ArrayUtils.toString(k));
        System.out.println("k1----------"+ArrayUtils.toString(k1));
        System.out.println("-----------------------------------------");

        // 12.基本数据类型数组与外包型数据类型数组互转
        Integer[] l=ArrayUtils.toObject(new int[] { 1, 2 });// new Integer[]{Integer,Integer}
        int[] l1=ArrayUtils.toPrimitive(new Integer[] { new Integer(1), new Integer(2) });// new int[]{1,2}
        System.out.println("l----------"+ArrayUtils.toString(l));
        System.out.println("l1----------"+ArrayUtils.toString(l1));
        System.out.println("-----------------------------------------");

        // 13.判断数组是否为空(null和length=0的时候都为空)
        boolean m=ArrayUtils.isEmpty(new int[0]);// true
        boolean m1=ArrayUtils.isEmpty(new Object[] { null });// false
        System.out.println("m----------"+ArrayUtils.toString(m));
        System.out.println("m1----------"+ArrayUtils.toString(m1));
        System.out.println("-----------------------------------------");

        // 14.合并两个数组
        int[] o=ArrayUtils.addAll(new int[] { 1, 3, 5 }, new int[] { 2, 4 });// {1,3,5,2,4}
        System.out.println("o----------"+ArrayUtils.toString(o));
        System.out.println("-----------------------------------------");

        // 15.添加一个数据到数组
        int[] p=ArrayUtils.add(new int[] { 1, 3, 5 }, 4);// {1,3,5,4}
        System.out.println("p----------"+ArrayUtils.toString(p));
        System.out.println("-----------------------------------------");

        // 16.删除数组中某个位置上的数据
        int[] q=ArrayUtils.remove(new int[] { 1, 3, 5 }, 1);// {1,5}
        System.out.println("q----------"+ArrayUtils.toString(q));
        System.out.println("-----------------------------------------");

        // 17.删除数组中某个对象(从正序开始搜索,删除第一个)
        int[] r=ArrayUtils.removeElement(new int[] { 1, 3, 5 }, 3);// {1,5}
        System.out.println("r----------"+ArrayUtils.toString(r));
        System.out.println("-----------------------------------------");

    }

}

结果

a----------{1,4,2,3}
a1----------{1,4,2,3}
a2----------I'm nothing!
-----------------------------------------
b----------true
b1----------false
b2----------false
b3----------false
b4----------false
b5----------false
b6----------true
-----------------------------------------
c----------{1=2, 3=4}
c1----------{1=2, 3=4}
-----------------------------------------
d----------{3,2,4}
-----------------------------------------
e----------{1,5}
e1----------{1,5,6}
-----------------------------------------
f----------true
-----------------------------------------
g----------3
-----------------------------------------
h----------true
h----------false
-----------------------------------------
i----------{5,2,1}
-----------------------------------------
j----------2
j1-----------1
j2----------2
-----------------------------------------
k----------true
k1----------false
-----------------------------------------
l----------{1,2}
l1----------{1,2}
-----------------------------------------
m----------true
m1----------false
-----------------------------------------
o----------{1,3,5,2,4}
-----------------------------------------
p----------{1,3,5,4}
-----------------------------------------
q----------{1,5}
-----------------------------------------
r----------{1,5}

-----------------------------------------

---

4.1.4 DateUtils

package com.kungeek.tip;

import java.util.Calendar;
import java.util.Date;

import org.apache.commons.lang.time.DateFormatUtils;
import org.apache.commons.lang.time.DateUtils;

public class test {

    public static void main(String[] args) {

        Date now = new Date();
        System.out.println("now:"+format(now));

        //addYears
        System.out.println("addYears:"+format(DateUtils.addYears(now, 1)));
        //addMonths
        System.out.println("addMonths:"+format(DateUtils.addMonths(now, 1)));
        //addDays
        System.out.println("addDays:"+format(DateUtils.addDays(now, 1)));
        //addHours
        System.out.println("addHours:"+format(DateUtils.addHours(now, 1)));
        //addMinutes
        System.out.println("addMinutes:"+format(DateUtils.addMinutes(now, 1)));
        //addSeconds
        System.out.println("addSeconds:"+format(DateUtils.addSeconds(now, 1)));
        //addMilliseconds
        System.out.println("addMilliseconds:"+DateUtils.addMilliseconds(now, 1));
        //-------------------------------------------------------------------------------------
        //isSameDay
        System.out.println("isSameDay:"+DateUtils.isSameDay(now, DateUtils.addYears(now, 1)));
        System.out.println("isSameDay:"+DateUtils.isSameDay(now, Calendar.getInstance().getTime()));
        //-------------------------------------------------------------------------------------
        //round
        System.out.println("round:"+format(DateUtils.round(now, 1)));
        System.out.println("round:"+format(DateUtils.round(now, 2)));
        //truncate
        System.out.println("truncate:"+format(DateUtils.truncate(now, 1)));
        System.out.println("truncate:"+format(DateUtils.truncate(now, 2)));
        //-------------------------------------------------------------------------------------
    }

    private static String format(Date date){
        return DateFormatUtils.format(date,"yyyy-MM-dd-HH:mm:ss");
    }

}

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" alt="" />

---

4.1.5 DateFormatUtils

与SUN的SimpleDateFormat相比，其主要优点是：线程安全。

对应于SimpleDateFormat的format()的方法，是DateFormatUtils 的format系列方法，常用的就是：

public static java.lang.String format (java.util.Date date, java.lang.String pattern);

DateFormatUtils定义了很多内置的固定日期格式，均为FastDateFormat类型，比如 ISO_DATE_FORMAT。使用 FastDateFormat的format()方法可以直接将日期格式化为内置的固定格式。

public java.lang.String format (java.util.Date date)

常用日期格式的格式化操作：

1: 以 yyyy-MM-dd 格式化:
DateFormatUtils.ISO_DATE_FORMAT.format(new
Date()): 2009-03-20

2:以 yyyy-MM-ddZZ 格式化:

DateFormatUtils.ISO_DATE_TIME_ZONE_FORMAT.format(new Date()):
2009-03-20+08:00

3:以
yyyy-MM-dd'T'HH:mm:ss 格式化:
DateFormatUtils.ISO_DATETIME_FORMAT.format(new
Date()): 2009-03-20T22:07:01

4: 以 yyyy-MM-dd'T'HH:mm:ssZZ 格式化:
DateFormatUtils.ISO_DATETIME_TIME_ZONE_FORMAT.format(new
Date()): 2009-03-20T22:07:01+08:00

5: 以 'T'HH:mm:ss 格式化:
DateFormatUtils.ISO_TIME_FORMAT.format(new
Date()): T22:07:01

6: 以 HH:mm:ss 格式化:
DateFormatUtils.ISO_TIME_NO_T_FORMAT.format(new
Date()): 22:07:01

7: 以 HH:mm:ssZZ 格式化:
DateFormatUtils.ISO_TIME_NO_T_TIME_ZONE_FORMAT.format(new
Date()): 22:07:01+08:00

8: 以 'T'HH:mm:ssZZ 格式化:
DateFormatUtils.ISO_TIME_TIME_ZONE_FORMAT.format(new
Date()): T22:07:01+08:00

自定义日期格式的格式化操作：

1: 以 yyyy-MM-dd
HH:mm:ss 格式化Date对象:
DateFormatUtils.format(new Date(),
"yyyy-MM-dd HH:mm:ss"): 2009-03-20 22:24:30

2: 以 yyyy-MM-dd HH:mm:ss 格式化Calendar对象:
DateFormatUtils.format(Calendar.getInstance(),
"yyyy-MM-dd HH:mm:ss"): 2009-03-20 22:24:30

3: 以 yyyy-MM-dd HH:mm:ss 格式化TimeInMillis:
DateFormatUtils.format(Calendar.getInstance().getTimeInMillis(),
"yyyy-MM-dd HH:mm:ss"): 2009-03-20 22:24:30

http://blog.csdn.net/spring_0534/article/details/6256991

package com.kungeek.tip;

import java.util.Date;

import org.apache.commons.lang.time.DateFormatUtils;

public class test {

    public static void main(String args[]){
        Date date = new Date();
        System.out.println(DateFormatUtils.ISO_DATE_FORMAT.format(date));
        System.out.println(DateFormatUtils.ISO_DATE_TIME_ZONE_FORMAT.format(date));
        System.out.println(DateFormatUtils.ISO_DATETIME_FORMAT.format(date));
        System.out.println(DateFormatUtils.ISO_DATETIME_TIME_ZONE_FORMAT.format(date));
        System.out.println(DateFormatUtils.ISO_TIME_FORMAT.format(date));
        System.out.println(DateFormatUtils.ISO_TIME_NO_T_FORMAT.format(date));
        System.out.println(DateFormatUtils.ISO_TIME_NO_T_TIME_ZONE_FORMAT.format(date));
        System.out.println(DateFormatUtils.ISO_TIME_TIME_ZONE_FORMAT.format(date));
        System.out.println(DateFormatUtils.ISO_DATE_FORMAT.format(date) + " " + DateFormatUtils.ISO_TIME_NO_T_FORMAT.format(date));

        System.out.println("--------------------------------");
        //----------------------------自定义模版
        System.out.println(DateFormatUtils.format(date,"yyyyMMdd"));
        System.out.println(DateFormatUtils.format(date,"yyyy-MM-dd-HH-mm-ss"));

        System.out.println(DateFormatUtils.format(date,"yyyyMMddhhmmss"));//12小时制
        System.out.println(DateFormatUtils.format(date,"yyyyMMddHHmmss"));//24小时制

    }

}

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4.1.6 RandomUtils

随机数据生成类,包括浮点,双精,布尔,整形,长整在内的随机数生成

RandomUtils.nextInt();采用默认的JVMRandom类，数值范围0~2147483647

nextInt(Random random)；也可以设置其他的random

还支持以下方法：

nextLong();

nextBoolean();

nextFloat();

nextDouble();

RandomUtils.nextBoolean();  

RandomUtils.nextDouble();  

RandomUtils.nextLong();  

// 注意这里传入的参数不是随机种子,而是在0~1000之间产生一位随机数  

RandomUtils.nextInt(1000);

4.1.7   NumberUtils

为JDK中的Number类提供额外的功能。

提供可复用的值为0,1的数值型的包装类。包括Long、Integer、Short、Byte、Double、Float。

/*1.NumberUtils.isNumber():判断字符串是否是数字*/

NumberUtils.isNumber("5.96");//结果是true

NumberUtils.isNumber("s5");//结果是false

NumberUtils.isNumber("0000000000596");//结果是true

/*2.NumberUtils.isDigits():判断字符串中是否全为数字*/

NumberUtils.isDigits("0000000000.596");//false

NumberUtils.isDigits("0000000000596");//true

/*3.NumberUtils.toInt():字符串转换为整数*/

NumberUtils.toInt("5");

NumberUtils.toLong("5");

NumberUtils.toByte("3");

NumberUtils.toFloat("3.2");

NumberUtils.toDouble("4");

NumberUtils.toShort("3");

/*4.NumberUtils.max():找出最大的一个*/

NumberUtils.max(newint[]{3,5,6});//结果是6

NumberUtils.max(3,1,7);//结果是7

/*5.NumberUtils.min():找出最小的一个*/

NumberUtils.min(newint[]{3,5,6});//结果是6

NumberUtils.min(3,1,7);//结果是7

/*6.NumberUtils.createBigDecimal()通过字符串创建BigDecimal类型，支持long、int、float、double、number等数值*/

NumberUtils.createBigDecimal("1");

NumberUtils.createLong("1");

NumberUtils.createInteger("1");

http://www.cnblogs.com/linjiqin/archive/2013/11/14/3423856.html

4.1.8 FieldUtils

通过反射技术来操作成员变量。

1 getField族

Field getField(Class<?> ,String [,Boolean]);

Field getDeclaredField(Class<?>,String [,Boolean]);

说明：

getField:   Gets an accessible Field by name breaking scope if requested. 当前类的接口和和父类都会被考虑。

getDeclaredField : an accessible Field by name respecting scope.

仅当前类被考虑。

http://jw-long.iteye.com/blog/1838178

http://www.yiibai.com/javalang/class_getfield.html

2   readField族

readStaticField(Field[,boolean]);

readStaticField(Class<?>,String[,boolean]);

readDeclaredStaticField(Class<?>,String[,boolean]);

readField(Field,Object[,boolean]);

readField(Object,String[,boolean]);

readDeclaredField(Object,String[,boolean])

获取字段的值。区别是：带有Declared的仅考虑当前类，其他情况会考虑当前类实现的接口以及其父类。

3   writeField族

writeStaticField(Field,Object[,boolean]);

writeStaticField(Class<?>,String,Object[,boolean]);

writeDeclaredStaticField(Class<?>,String,Object[,boolean]);

writeField(Field,Object,Object[,boolean]);

writeField(Object, String, Object[,boolean]);

writeDeclaredField(Object, String, Object[,boolean]);

设置字段的值.

4.1.8    CharUtils

静态类，不需要创建

1 public static boolean isAscii(char ch)

用途：判断是否为ascii字符

实现：

public static Boolean isAscii(char ch){

return ch < 128;

}

2 public static boolean isAsciiAlpha(char ch)

用途：判断是否为ascii字母，即值在65到90或者97到122

实现：

public static Boolean isAsciiAlpha(char ch) {

return (ch >= ‘A’&& ch <= ‘Z’) || (ch >= ‘a’&& CH <= ‘z’)

}

3 public static Boolean isAsciiAlphaLower(char ch)

同2. 判断范围是 65 到 90，即a 到 z.

4 public static boolean isAsciiAlphaUpper(char ch);

同2.判断范围是97到122.即A 到Z.

5 public static boolean isAsciiAlphanumeric(char ch)

用途：判断是否为ascii字符数字，即值在48到57，65到90或者97到122.

实现：

Public static boolean isAsciiAlphanumeric(char ch) {

return (ch >= ‘A’&& cn <= ‘Z’) || (ch >= ‘a’&& ch <= ‘z’) || (ch >= ‘0’&& ch <= ‘9’)

}

6  public static Boolean isAsciiControl(char ch)

用途：判断是否为控制字符

实现：

public static boolean isAsciiControl(char ch) {

return ch < 32 || ch = 127;

}

7 public static boolean isAsciiNumeric(char ch)

用途：判断是否为数字

实现：

Public static Boolean isAsciiNumeric(char ch) {

Return ch >= ‘0’ && ch <= ‘9’;

}

8 public static Boolean isAsciiPrintable(char ch)

用途：判断是否可打印出得ascii字符

实现：

Public static Boolean isAsciiPrintable(char ch) {

return ch >= 32 && ch < 127;

}

9 public static int toIntValue(char ch)

用途：数字转换

实现：

Public static int toIntValue(char ch) {

if(isAsciiNumeric(ch) == false) {

throw new IllegalArgumentException(“the character” + ch + “is not in the range ‘0’- ‘9’”)

}

Return ch – 48;

}

10 public static String unicodeEscaped(char ch)

用途：将ch转换为unicode表示的字符串形式

实现：

public static String unicodeEscaped(char ch) {

if(ch < 0x10) {

return “\\u000” + Integer.toHexString(ch);

}else if(ch < 0x100){

retrun  “\\u00” + Integer.toHexString(ch);

}else if(ch < 0x1000) {

Return “\\u0” + Integer.toHexString(ch);

}

Return “\\u” + Integer.toHexString(ch);

}

4.1.10 BooleanUtils 

1  negate(Boolean bool)

用法：否定指定的boolean值

2  isTrue(Boolean bool)

用法：检查一个boolean值是否为true,如果参数为null,返回false

3  isNotTrue(Boolean bool)

用法：检查一个boolean值是否为false,如果参数为null,返回true

4  isFalse(Boolean bool)

用法：检查一个boolean值是否为false,如果是 返回true.

如果检查的值为true或null返回false.

5  isNotFalse(Boolean bool)

用法：检查一个boolean值是否不为false,如果是返回true

6  toBoolean(Boolean bool)

用法：转换一个为null的boolean值,返回一个false.

* <pre>

*   BooleanUtils.toBoolean(Boolean.TRUE)  = true

*   BooleanUtils.toBoolean(Boolean.FALSE) = false

*   BooleanUtils.toBoolean(null)          = false

* </pre>

7  toBooleanDefaultIfNull(Boolean bool, boolean valueIfNull)

用法： 转换一个为null的boolean值,返回后面参数给定的boolean值.

* <pre>

*   BooleanUtils.toBooleanDefaultIfNull(Boolean.TRUE, false) = true

*   BooleanUtils.toBooleanDefaultIfNull(Boolean.FALSE, true) = false

*   BooleanUtils.toBooleanDefaultIfNull(null, true)          = true

* </pre>

*/

8  toBoolean(int value)

用法： 当参数为0是返回false,其它都返回true.

* <pre>

*   BooleanUtils.toBoolean(0) = false

*   BooleanUtils.toBoolean(1) = true

*   BooleanUtils.toBoolean(2) = true

* </pre>

9  toBooleanObject(int value)

用法：  当参数为0是返回Boolean.FALSE对象,其它都返回Boolean.TRUE.

* <pre>

*   BooleanUtils.toBoolean(0) = Boolean.FALSE

*   BooleanUtils.toBoolean(1) = Boolean.TRUE

*   BooleanUtils.toBoolean(2) = Boolean.TRUE

* </pre>

10  toBooleanObject(Integer value)

用法： 当参数为0是返回Boolean.FALSE对象,为null返回null

* 其它则返回Boolean.TRUE.

* <pre>

*   BooleanUtils.toBoolean(new Integer(0))    = Boolean.FALSE

*   BooleanUtils.toBoolean(new Integer(1))    = Boolean.TRUE

*   BooleanUtils.toBoolean(new Integer(null)) = null

* </pre>

11  toBoolean(int value, int trueValue, int falseValue)

用法：   * 如果第一个参数和第二个参数相等返回true,

* 如果第一个参数和第三个参数相等返回false,

* 如果都没有相等的,返回一个IllegalArgumentException

* * <pre>

*   BooleanUtils.toBoolean(0, 1, 0) = false

*   BooleanUtils.toBoolean(1, 1, 0) = true

*   BooleanUtils.toBoolean(2, 1, 2) = false

*   BooleanUtils.toBoolean(2, 2, 0) = true

* </pre>

4.1.11 ExceptionUtils

对异常的常见操作,获得堆栈,异常抛出方法名,错误链中对象数

public static Throwable getCause(Throwable [,String[]])；

用法：获取导致Throwable的Throwable. 可以设置自己制定的方法名称.

public static Throwable getRootCause(Throwable throwable);

用法：获取导致Throwable的 Root Throwable。

public static int getThrowableCount(Throwable throwable)

用法：统计异常链上的Throwable对象数量。

A throwable without cause will return 1；

A throwable with one cause will return 2 and so on

A null throwable will return 0.