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356 lines (333 loc) · 11 KB
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package com.realmo.utils;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* String Utils
*
* @author <a href="http://www.trinea.cn" target="_blank">Trinea</a>
*/
public class AEStringUtils {
/**
* is null or its length is 0 or it is made by space
*
* <pre>
* isBlank(null) = true;
* isBlank("") = true;
* isBlank(" ") = true;
* isBlank("a") = false;
* isBlank("a ") = false;
* isBlank(" a") = false;
* isBlank("a b") = false;
* </pre>
*
* @param str
* @return if string is null or its size is 0 or it is made by space, return
* true, else return false.
*/
public static boolean isBlank(String str) {
return (str == null || str.trim().length() == 0);
}
/**
* is null or its length is 0
*
* <pre>
* isEmpty(null) = true;
* isEmpty("") = true;
* isEmpty(" ") = false;
* </pre>
*
* @param str
* @return if string is null or its size is 0, return true, else return
* false.
*/
public static boolean isEmpty(String str) {
return (str == null || str.length() == 0);
}
/**
* null string to empty string
*
* <pre>
* nullStrToEmpty(null) = "";
* nullStrToEmpty("") = "";
* nullStrToEmpty("aa") = "aa";
* </pre>
*
* @param str
* @return
*/
public static String nullStrToEmpty(String str) {
return (str == null ? "" : str);
}
/**
* capitalize first letter
*
* <pre>
* capitalizeFirstLetter(null) = null;
* capitalizeFirstLetter("") = "";
* capitalizeFirstLetter("2ab") = "2ab"
* capitalizeFirstLetter("a") = "A"
* capitalizeFirstLetter("ab") = "Ab"
* capitalizeFirstLetter("Abc") = "Abc"
* </pre>
*
* @param str
* @return
*/
public static String capitalizeFirstLetter(String str) {
if (isEmpty(str)) {
return str;
}
char c = str.charAt(0);
return (!Character.isLetter(c) || Character.isUpperCase(c)) ? str
: new StringBuilder(str.length())
.append(Character.toUpperCase(c))
.append(str.substring(1)).toString();
}
/**
* encoded in utf-8
*
* <pre>
* utf8Encode(null) = null
* utf8Encode("") = "";
* utf8Encode("aa") = "aa";
* utf8Encode("啊啊啊啊") = "%E5%95%8A%E5%95%8A%E5%95%8A%E5%95%8A";
* </pre>
*
* @param str
* @return
* @throws UnsupportedEncodingException
* if an error occurs
*/
public static String utf8Encode(String str) {
if (!isEmpty(str) && str.getBytes().length != str.length()) {
try {
return URLEncoder.encode(str, "UTF-8");
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(
"UnsupportedEncodingException occurred. ", e);
}
}
return str;
}
/**
* encoded in utf-8, if exception, return defultReturn
*
* @param str
* @param defultReturn
* @return
*/
public static String utf8Encode(String str, String defultReturn) {
if (!isEmpty(str) && str.getBytes().length != str.length()) {
try {
return URLEncoder.encode(str, "UTF-8");
} catch (UnsupportedEncodingException e) {
return defultReturn;
}
}
return str;
}
/**
* decode in utf-8
*
* <pre>
* utf8Decoder(null) = null
* utf8Decoder("") = "";
* utf8Decoder("aa") = "aa";
* utf8Decoder("%E5%95%8A%E5%95%8A%E5%95%8A%E5%95%8A") = "啊啊啊啊";
* </pre>
*
* @param str
* @return
* @throws UnsupportedEncodingException
* if an error occurs
*/
public static String utf8Decoder(String str){
if (!isEmpty(str) && str.getBytes().length != str.length()) {
try {
return URLDecoder.decode(str, "UTF-8");
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(
"UnsupportedEncodingException occurred. ", e);
}
}
return str;
}
/**
* get innerHtml from href
*
* <pre>
* getHrefInnerHtml(null) = ""
* getHrefInnerHtml("") = ""
* getHrefInnerHtml("mp3") = "mp3";
* getHrefInnerHtml("<a innerHtml</a>") = "<a innerHtml</a>";
* getHrefInnerHtml("<a>innerHtml</a>") = "innerHtml";
* getHrefInnerHtml("<a<a>innerHtml</a>") = "innerHtml";
* getHrefInnerHtml("<a href="baidu.com">innerHtml</a>") = "innerHtml";
* getHrefInnerHtml("<a href="baidu.com" title="baidu">innerHtml</a>") = "innerHtml";
* getHrefInnerHtml(" <a>innerHtml</a> ") = "innerHtml";
* getHrefInnerHtml("<a>innerHtml</a></a>") = "innerHtml";
* getHrefInnerHtml("jack<a>innerHtml</a></a>") = "innerHtml";
* getHrefInnerHtml("<a>innerHtml1</a><a>innerHtml2</a>") = "innerHtml2";
* </pre>
*
* @param href
* @return <ul>
* <li>if href is null, return ""</li>
* <li>if not match regx, return source</li>
* <li>return the last string that match regx</li>
* </ul>
*/
public static String getHrefInnerHtml(String href) {
if (isEmpty(href)) {
return "";
}
String hrefReg = ".*<[\\s]*a[\\s]*.*>(.+?)<[\\s]*/a[\\s]*>.*";
Pattern hrefPattern = Pattern
.compile(hrefReg, Pattern.CASE_INSENSITIVE);
Matcher hrefMatcher = hrefPattern.matcher(href);
if (hrefMatcher.matches()) {
return hrefMatcher.group(1);
}
return href;
}
/**
* process special char in html
*
* <pre>
* htmlEscapeCharsToString(null) = null;
* htmlEscapeCharsToString("") = "";
* htmlEscapeCharsToString("mp3") = "mp3";
* htmlEscapeCharsToString("mp3<") = "mp3<";
* htmlEscapeCharsToString("mp3>") = "mp3\>";
* htmlEscapeCharsToString("mp3&mp4") = "mp3&mp4";
* htmlEscapeCharsToString("mp3"mp4") = "mp3\"mp4";
* htmlEscapeCharsToString("mp3<>&"mp4") = "mp3\<\>&\"mp4";
* </pre>
*
* @param source
* @return
*/
public static String htmlEscapeCharsToString(String source) {
return AEStringUtils.isEmpty(source) ? source : source
.replaceAll("<", "<").replaceAll(">", ">")
.replaceAll("&", "&").replaceAll(""", "\"");
}
/**
* transform half width char to full width char
*
* <pre>
* fullWidthToHalfWidth(null) = null;
* fullWidthToHalfWidth("") = "";
* fullWidthToHalfWidth(new String(new char[] {12288})) = " ";
* fullWidthToHalfWidth("！＂＃＄％＆) = "!\"#$%&";
* </pre>
*
* @param s
* @return
*/
public static String fullWidthToHalfWidth(String s) {
if (isEmpty(s)) {
return s;
}
char[] source = s.toCharArray();
for (int i = 0; i < source.length; i++) {
if (source[i] == 12288) {
source[i] = ' ';
// } else if (source[i] == 12290) {
// source[i] = '.';
} else if (source[i] >= 65281 && source[i] <= 65374) {
source[i] = (char) (source[i] - 65248);
} else {
source[i] = source[i];
}
}
return new String(source);
}
/**
* transform full width char to half width char
*
* <pre>
* halfWidthToFullWidth(null) = null;
* halfWidthToFullWidth("") = "";
* halfWidthToFullWidth(" ") = new String(new char[] {12288});
* halfWidthToFullWidth("!\"#$%&) = "！＂＃＄％＆";
* </pre>
*
* @param s
* @return
*/
public static String halfWidthToFullWidth(String s) {
if (isEmpty(s)) {
return s;
}
char[] source = s.toCharArray();
for (int i = 0; i < source.length; i++) {
if (source[i] == ' ') {
source[i] = (char) 12288;
// } else if (source[i] == '.') {
// source[i] = (char)12290;
} else if (source[i] >= 33 && source[i] <= 126) {
source[i] = (char) (source[i] + 65248);
} else {
source[i] = source[i];
}
}
return new String(source);
}
public static String escape(String src) {
int i;
char j;
StringBuffer tmp = new StringBuffer();
tmp.ensureCapacity(src.length() * 6);
for (i = 0; i < src.length(); i++) {
j = src.charAt(i);
if (Character.isDigit(j) || Character.isLowerCase(j)
|| Character.isUpperCase(j))
tmp.append(j);
else if (j < 256) {
tmp.append("%");
if (j < 16)
tmp.append("0");
tmp.append(Integer.toString(j, 16));
} else {
tmp.append("%u");
tmp.append(Integer.toString(j, 16));
}
}
return tmp.toString();
}
public static String unescape(String src) {
StringBuffer tmp = new StringBuffer();
tmp.ensureCapacity(src.length());
int lastPos = 0, pos = 0;
char ch;
while (lastPos < src.length()) {
pos = src.indexOf("%", lastPos);
if (pos == lastPos) {
if (src.charAt(pos + 1) == 'u') {
ch = (char) Integer.parseInt(
src.substring(pos + 2, pos + 6), 16);
tmp.append(ch);
lastPos = pos + 6;
} else {
ch = (char) Integer.parseInt(
src.substring(pos + 1, pos + 3), 16);
tmp.append(ch);
lastPos = pos + 3;
}
} else {
if (pos == -1) {
tmp.append(src.substring(lastPos));
lastPos = src.length();
} else {
tmp.append(src.substring(lastPos, pos));
lastPos = pos;
}
}
}
return tmp.toString();
}
}