Java判断字符串是否为IP地址的方法

Java 判断字符串是否为IP地址，供大家参考，具体内容如下

1、代码

主要就是这么几个条件

• 非空
• 长度符合 0.0.0.0 - 255.255.255.255
• 包含分隔符 且 个数正确
• 四个全部是数字，且都在合理的范围内
  

 
 public static boolean isIpStr(String str) {
 // 非空
 // boolean notBlank = StringUtils.isNotBlank(str);
 // 长度符合 0.0.0.0 - 255.255.255.255
 // boolean length = CommonUtils.isNumberBetween(str.length(),7,15);

 if (StringUtils.isNotBlank(str) && CommonUtils.isNumberBetween(str.length(), 7, 15)) {
  String regex = ".";
  // 包含分隔符 且 个数正确
  if (str.contains(regex) && str.split(regex).length == 4) {
  boolean legalNumber = true;
  // 四个全部是数字，且都在合理的范围内
  for (String obj : Lists.newArrayList(str.split(regex))) {
   if (NumberUtils.isDigit(obj)) {
   Integer value = Integer.parseInt(obj);
   legalNumber = CommonUtils.isNumberBetween(value, 0, 255);
   } else {
   // 任意一个不是数字，不合法
   legalNumber = false;
   break;
   }
  }
  return legalNumber;
  }
 }
 return false;
}

2、CommonUtils 工具类

package cn.zjcs.common.util;

import cn.hutool.core.util.ReUtil;
import lombok.AccessLevel;
import lombok.Getter;
import lombok.NoArgsConstructor;

import java.math.BigDecimal;
import java.math.RoundingMode;



@NoArgsConstructor(access = AccessLevel.PRIVATE)
public class CommonUtils {


 
 public static boolean isNull(Object o) {
 return o == null;
 }

 
 public static boolean isNotNull(Object o) {
 return !isNull(o);
 }

 
 public static boolean isZeroDecimal(BigDecimal bigDecimal) {
 return isNotNull(bigDecimal) && bigDecimal.compareTo(BigDecimal.ZERO) == 0;
 }

 
 public static boolean isNotZeroDecimal(BigDecimal bigDecimal) {
 return !isZeroDecimal(bigDecimal);
 }

 
 public static boolean isoneDecimal(BigDecimal bigDecimal) {
 return isNotNull(bigDecimal) && bigDecimal.compareTo(BigDecimal.ONE) == 0;
 }

 
 public static boolean isNotoneDecimal(BigDecimal bigDecimal) {
 return bigDecimal.compareTo(BigDecimal.ONE) != 0;
 }

 
 public static boolean isZeroLong(Long l) {
 return l != null && l.equals(0L);
 }

 
 public static boolean isNotZeroLong(Long l) {
 return !isZeroLong(l);
 }

 
 public static boolean isZeroInt(Integer l) {
 return l != null && l.equals(0);
 }

 
 public static boolean isNotZeroInt(Integer l) {
 return !isZeroInt(l);
 }

 
 public static boolean isSameDecimal(BigDecimal i, BigDecimal j) {
 return i.compareTo(j) == 0;
 }

 
 public static boolean isDecimalGt(BigDecimal i, BigDecimal j) {
 return i.compareTo(j) > 0;
 }

 
 public static boolean isDecimalLt(BigDecimal i, BigDecimal j) {
 return i.compareTo(j) < 0;
 }

 
 public static String replaceSpecialCharacter(String character) {
 String regEx = "[`~!@#$%^&*()+=|{}':;',\[\].<>/?~！@#￥%……&*（）——+|{}【】‘；：”“'。，、？]";
 return ReUtil.replaceAll(character, regEx, "");
 }

 
 public static BigDecimal percentFormat(Integer p, String h) {
 return new BigDecimal(String.valueOf(p)).divide(new BigDecimal(h), 4, RoundingMode.HALF_UP).setScale(4, BigDecimal.ROUND_HALF_UP);
 }

 public static boolean orEq(Object... o) {
 if (o.length < 2) {
  throw new NullPointerException("长度不足");
 }
 Object o1 = o[0];
 for (int i = 1; i < o.length - 1; i++) {
  if (o1.equals(o[i])) {
  return true;
  }
 }
 return false;
 }

 
 public static boolean isNumberBetween(Number number, Number min, Number max) {
 return number.longValue() >= min.longValue() && number.longValue() <= max.longValue();
 }


 
 @NoArgsConstructor(access = AccessLevel.PRIVATE)
 public static class Math {

 
 @SuppressWarnings("rawtypes")
 @Getter
 public static class Fraction extends Number implements Comparable {
  private static final long serialVersionUID = 2330398718018182597L;
  
  private long numerator = 0;
  
  private long denominator = 1;

  public Fraction() {
  this(0, 1);
  }

  public Fraction(long numerator, long denominator) {
  long gcd = gcd(numerator, denominator);
  this.numerator = ((denominator > 0) ? 1 : -1) * numerator / gcd;
  this.denominator = java.lang.Math.abs(denominator) / gcd;
  }

  
  private long gcd(long f, long s) {
  long fAbs = java.lang.Math.abs(f);
  long sAbs = java.lang.Math.abs(s);
  // 学术名称 Gcd
  int _Gcd = 1;
  // 欧几里德算法
  for (int i = 1; i <= fAbs && i <= sAbs; i++) {
   if (fAbs % i == 0 && sAbs % i == 0) {
   _Gcd = i;
   }
  }
  return _Gcd;
  }

  
  public Fraction add(Fraction secondRational) {
  long n = numerator * secondRational.getDenominator() + denominator * secondRational.getNumerator();
  long d = denominator * secondRational.getDenominator();
  return new Fraction(n, d);
  }

  
  public Fraction subtract(Fraction secondRational) {
  long n = numerator * secondRational.getDenominator() - denominator * secondRational.getNumerator();
  long d = denominator * secondRational.getDenominator();
  return new Fraction(n, d);
  }

  
  public Fraction mulitiply(Fraction secondRational) {
  long n = numerator * secondRational.getNumerator();
  long d = denominator * secondRational.getDenominator();
  return new Fraction(n, d);
  }

  
  public Fraction divide(Fraction secondRational) {
  long n = numerator * secondRational.getDenominator();
  long d = denominator * secondRational.numerator;
  return new Fraction(n, d);
  }

  @Override
  public String toString() {
  if (denominator == 1) {
   return numerator + "";
  } else {
   return numerator + "/" + denominator;
  }

  }

  @SuppressWarnings("all")
  @Override
  public boolean equals(Object parm1) {
  return (this.subtract((Fraction) (parm1))).getNumerator() == 0;
  }

  @Override
  public int compareTo(Object o) {
  if ((this.subtract((Fraction) o)).getNumerator() > 0) {
   return 1;
  } else if ((this.subtract((Fraction) o)).getNumerator() > 0) {
   return -1;
  } else {
   return 0;
  }

  }

  @Override
  public double doublevalue() {
  return numerator * 1.0 / denominator;
  }

  @Override
  public float floatValue() {
  return (float) doublevalue();
  }

  @Override
  public int intValue() {
  return (int) doublevalue();
  }

  @Override
  public long longValue() {
  return (long) doublevalue();
  }
 }


 
 public static BigDecimal divide(BigDecimal dividend, BigDecimal divisor, int accuracy) {
  // 0 除以任何数 = 无穷大，任何数除以 0 无法除，都会抛出错误
  if (isZeroDecimal(divisor) || isZeroDecimal(dividend)) {
  return BigDecimal.ZERO;
  }
  return dividend.divide(divisor, 16, RoundingMode.HALF_UP).setScale(accuracy, RoundingMode.HALF_UP);
 }

 
 public static BigDecimal multiply(BigDecimal f, BigDecimal s, int accuracy) {
  // 0 * 任何数 = 0
  if (isZeroDecimal(f) || isZeroDecimal(s)) {
  return BigDecimal.ZERO;
  }
  return f.multiply(s).setScale(accuracy, RoundingMode.HALF_UP);
 }

 
 public static BigDecimal pow(BigDecimal f, BigDecimal s) {
  // 防止出现 Infinity 的情况
  if (isZeroDecimal(f) && isDecimalLt(s, BigDecimal.ZERO)) {
  return BigDecimal.ZERO;
  }
  return new BigDecimal(String.valueOf(java.lang.Math.pow(f.doublevalue(), s.doublevalue())));
 }

 
 public static BigDecimal fraction(Fraction f) {
  long denominator = f.getDenominator();
  long numerator = f.getNumerator();
  return divide(new BigDecimal(String.valueOf(numerator)), new BigDecimal(String.valueOf(denominator)), 16);
 }

 }
}

3、NumberUtils 工具类

package cn.zjcs.common.util;

import lombok.AccessLevel;
import lombok.NoArgsConstructor;

import java.math.BigDecimal;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


@NoArgsConstructor(access = AccessLevel.PRIVATE)
public class NumberUtils {

 private static final Pattern DIGIT_PATTERN = Pattern.compile("[0-9]*");

 
 public static boolean isZeroDecimal(BigDecimal decimal) {
 return decimal == null || decimal.compareTo(BigDecimal.ZERO) == 0;
 }

 
 public static boolean isNotZeroDecimal(BigDecimal decimal) {
 return decimal != null && decimal.compareTo(BigDecimal.ZERO) != 0;
 }

 
 public static boolean isDigit(String var) {
 Matcher isNum = DIGIT_PATTERN.matcher(var);
 return isNum.matches();
 }

 public static boolean isEmptyNumber(Number number) {
 return number == null
   || number.intValue() == 0
   || number.longValue() == 0
   || number.doublevalue() == 0.00
   || number.bytevalue() == 0
   || number.floatValue() == 0.0
   || number.shortValue() == 0;
 }

 public static boolean isNotEmptyNumber(Number number) {
 return !isEmptyNumber(number);
 }

 public static boolean isNotZeroLong(Long something) {
 if (something == null) {
  return false;
 }
 return !something.equals(0L);
 }
}

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