StringUtils.java
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package com.bjivt.util;
import java.util.ArrayList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class StringUtils {
public StringUtils(){
}
public static boolean isEmpty(String str) {
return str == null ||str.equals("")|| str.trim().length() == 0;
}
/**
* <p>Checks if a String is not empty ("") and not null.</p>
*
* <pre>
* StringUtils.isNotEmpty(null) = false
* StringUtils.isNotEmpty("") = false
* StringUtils.isNotEmpty(" ") = true
* StringUtils.isNotEmpty("bob") = true
* StringUtils.isNotEmpty(" bob ") = true
* </pre>
*
* @param str the String to check, may be null
* @return <code>true</code> if the String is not empty and not null
*/
public static boolean isNotEmpty(String str) {
return !StringUtils.isEmpty(str);
}
// Substring
//-----------------------------------------------------------------------
/**
* <p>Gets a substring from the specified String avoiding exceptions.</p>
*
* <p>A negative start position can be used to start <code>n</code>
* characters from the end of the String.</p>
*
* <p>A <code>null</code> String will return <code>null</code>.
* An empty ("") String will return "".</p>
*
* <pre>
* StringUtils.substring(null, *) = null
* StringUtils.substring("", *) = ""
* StringUtils.substring("abc", 0) = "abc"
* StringUtils.substring("abc", 2) = "c"
* StringUtils.substring("abc", 4) = ""
* StringUtils.substring("abc", -2) = "bc"
* StringUtils.substring("abc", -4) = "abc"
* </pre>
*
* @param str the String to get the substring from, may be null
* @param start the position to start from, negative means
* count back from the end of the String by this many characters
* @return substring from start position, <code>null</code> if null String input
*/
public static String substring(String str, int start) {
if (str == null) {
return null;
}
// handle negatives, which means last n characters
if (start < 0) {
start = str.length() + start; // remember start is negative
}
if (start < 0) {
start = 0;
}
if (start > str.length()) {
return "";
}
return str.substring(start);
}
/**
* <p>Gets a substring from the specified String avoiding exceptions.</p>
*
* <p>A negative start position can be used to start/end <code>n</code>
* characters from the end of the String.</p>
*
* <p>The returned substring starts with the character in the <code>start</code>
* position and ends before the <code>end</code> position. All position counting is
* zero-based -- i.e., to start at the beginning of the string use
* <code>start = 0</code>. Negative start and end positions can be used to
* specify offsets relative to the end of the String.</p>
*
* <p>If <code>start</code> is not strictly to the left of <code>end</code>, ""
* is returned.</p>
*
* <pre>
* StringUtils.substring(null, *, *) = null
* StringUtils.substring("", * , *) = "";
* StringUtils.substring("abc", 0, 2) = "ab"
* StringUtils.substring("abc", 2, 0) = ""
* StringUtils.substring("abc", 2, 4) = "c"
* StringUtils.substring("abc", 4, 6) = ""
* StringUtils.substring("abc", 2, 2) = ""
* StringUtils.substring("abc", -2, -1) = "b"
* StringUtils.substring("abc", -4, 2) = "ab"
* </pre>
*
* @param str the String to get the substring from, may be null
* @param start the position to start from, negative means
* count back from the end of the String by this many characters
* @param end the position to end at (exclusive), negative means
* count back from the end of the String by this many characters
* @return substring from start position to end positon,
* <code>null</code> if null String input
*/
public static String substring(String str, int start, int end) {
if (str == null) {
return null;
}
// handle negatives
if (end < 0) {
end = str.length() + end; // remember end is negative
}
if (start < 0) {
start = str.length() + start; // remember start is negative
}
// check length next
if (end > str.length()) {
end = str.length();
}
// if start is greater than end, return ""
if (start > end) {
return "";
}
if (start < 0) {
start = 0;
}
if (end < 0) {
end = 0;
}
return str.substring(start, end);
}
// Equals
public static boolean equals(String str1, String str2) {
return str1 == null ? str2 == null : str1.equals(str2);
}
/**
* 锟斤拷锟斤拷锟斤拷锟斤拷欠锟斤拷锟斤拷锟截革拷值
* @param str
* @return
*/
public static boolean isRepeat (String[] str) {
ArrayList list = new ArrayList();
for (int i = 0; i < str.length; i++) {
if (!list.contains(str[i])) {
list.add(str[i]);
} else {
return true;
}
}
return false;
}
/**
* 鎵嬫満鍙烽獙璇�
*
* @param str
* @return 楠岃瘉閫氳繃杩斿洖true
*/
public static boolean isMobile(String str) {
Pattern p = null;
Matcher m = null;
boolean b = false;
p = Pattern.compile("^[1][3,4,5,7,8][0-9]{9}$"); // 楠岃瘉鎵嬫満鍙�
m = p.matcher(str);
b = m.matches();
return b;
}
public static boolean isNumberOrAlpha(String str) {
Pattern p = null;
Matcher m = null;
boolean b = false;
p = Pattern.compile("^[a-zA-Z0-9]{6}$"); // 楠岃瘉鎵嬫満鍙�
m = p.matcher(str);
b = m.matches();
return b;
}
}