字符串工具类
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2022-06-25 11:22:16
字符串工具类import org.apache.commons.lang.StringEscapeUtils;import javax.servlet.http.HttpServletRequest;import java.io.UnsupportedEncodingException;import java.util.ArrayList;import java.util.Collection;import java.util.List;import java.util.Map;import...
字符串工具类
import org.apache.commons.lang.StringEscapeUtils;
import javax.servlet.http.HttpServletRequest;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class StringUtils extends org.apache.commons.lang.StringUtils {
private static final char SEPARATOR = '_';
private static final String CHARSET_NAME = "UTF-8";
/**
* 转换为字节数组
*
* @param str
* @return
*/
public static byte[] getBytes(String str) {
if (str != null) {
try {
return str.getBytes(CHARSET_NAME);
} catch (UnsupportedEncodingException e) {
return null;
}
} else {
return null;
}
}
/**
* 转换为字节数组
*
* @param bytes
* @return
*/
public static String toString(byte[] bytes) {
try {
return new String(bytes, CHARSET_NAME);
} catch (UnsupportedEncodingException e) {
return EMPTY;
}
}
/**
* 是否包含字符串
*
* @param str 验证字符串
* @param strs 字符串组
* @return 包含返回true
*/
public static boolean inString(String str, String... strs) {
if (str != null) {
for (String s : strs) {
if (str.equals(trim(s))) {
return true;
}
}
}
return false;
}
/**
* 替换掉HTML标签方法
*/
public static String replaceHtml(String html) {
if (isBlank(html)) {
return "";
}
String regEx = "<.+?>";
Pattern p = Pattern.compile(regEx);
Matcher m = p.matcher(html);
String s = m.replaceAll("");
return s;
}
/**
* 替换为手机识别的HTML,去掉样式及属性,保留回车。
*
* @param html
* @return
*/
public static String replaceMobileHtml(String html) {
if (html == null) {
return "";
}
return html.replaceAll("<([a-z]+?)\\s+?.*?>", "<$1>");
}
/**
* 替换为手机识别的HTML,去掉样式及属性,保留回车。
*
* @param txt
* @return
*/
public static String toHtml(String txt) {
if (txt == null) {
return "";
}
return "";//replace(replace(Encodes.escapeHtml(txt), "\n", "<br/>"), "\t", " ");
}
/**
* 缩略字符串(不区分中英文字符)
*
* @param str 目标字符串
* @param length 截取长度
* @return
*/
public static String abbr(String str, int length) {
if (str == null) {
return "";
}
try {
StringBuilder sb = new StringBuilder();
int currentLength = 0;
for (char c : replaceHtml(StringEscapeUtils.unescapeHtml(str)).toCharArray()) {
currentLength += String.valueOf(c).getBytes("GBK").length;
if (currentLength <= length - 3) {
sb.append(c);
} else {
sb.append("...");
break;
}
}
return sb.toString();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return "";
}
public static String abbr2(String param, int length) {
if (param == null) {
return "";
}
StringBuffer result = new StringBuffer();
int n = 0;
char temp;
boolean isCode = false; // 是不是HTML代码
boolean isHTML = false; // 是不是HTML特殊字符,如
for (int i = 0; i < param.length(); i++) {
temp = param.charAt(i);
if (temp == '<') {
isCode = true;
} else if (temp == '&') {
isHTML = true;
} else if (temp == '>' && isCode) {
n = n - 1;
isCode = false;
} else if (temp == ';' && isHTML) {
isHTML = false;
}
try {
if (!isCode && !isHTML) {
n += String.valueOf(temp).getBytes("GBK").length;
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
if (n <= length - 3) {
result.append(temp);
} else {
result.append("...");
break;
}
}
// 取出截取字符串中的HTML标记
String temp_result = result.toString().replaceAll("(>)[^<>]*(<?)",
"$1$2");
// 去掉不需要结素标记的HTML标记
temp_result = temp_result
.replaceAll(
"</?(AREA|BASE|BASEFONT|BODY|BR|COL|COLGROUP|DD|DT|FRAME|HEAD|HR|HTML|IMG|INPUT|ISINDEX|LI|LINK|META|OPTION|P|PARAM|TBODY|TD|TFOOT|TH|THEAD|TR|area|base|basefont|body|br|col|colgroup|dd|dt|frame|head|hr|html|img|input|isindex|li|link|meta|option|p|param|tbody|td|tfoot|th|thead|tr)[^<>]*/?>",
"");
// 去掉成对的HTML标记
temp_result = temp_result.replaceAll("<([a-zA-Z]+)[^<>]*>(.*?)</\\1>",
"$2");
// 用正则表达式取出标记
Pattern p = Pattern.compile("<([a-zA-Z]+)[^<>]*>");
Matcher m = p.matcher(temp_result);
List<String> endHTML = new ArrayList<String>();//Lists.newArrayList();
while (m.find()) {
endHTML.add(m.group(1));
}
// 补全不成对的HTML标记
for (int i = endHTML.size() - 1; i >= 0; i--) {
result.append("</");
result.append(endHTML.get(i));
result.append(">");
}
return result.toString();
}
/**
* 转换为Double类型
*/
public static Double toDouble(Object val) {
if (val == null) {
return 0D;
}
try {
return Double.valueOf(trim(val.toString()));
} catch (Exception e) {
return 0D;
}
}
/**
* 转换为Float类型
*/
public static Float toFloat(Object val) {
return toDouble(val).floatValue();
}
/**
* 转换为Long类型
*/
public static Long toLong(Object val) {
return toDouble(val).longValue();
}
/**
* 转换为Integer类型
*/
public static Integer toInteger(Object val) {
return toLong(val).intValue();
}
/**
* 转换为boolean类型
*/
public static boolean toBoolean(String val) {
return Boolean.parseBoolean(val);
}
/**
* 获得i18n字符串
*/
public static String getMessage(String code, Object[] args) {
return "";//SpringContextHolder.getApplicationContext().getMessage(code, args, localLocale);
}
/**
* 获得用户远程地址
*/
public static String getRemoteAddr(HttpServletRequest request) {
String remoteAddr = request.getHeader("X-Real-IP");
if (isNotBlank(remoteAddr)) {
remoteAddr = request.getHeader("X-Forwarded-For");
} else if (isNotBlank(remoteAddr)) {
remoteAddr = request.getHeader("Proxy-Client-IP");
} else if (isNotBlank(remoteAddr)) {
remoteAddr = request.getHeader("WL-Proxy-Client-IP");
}
return remoteAddr != null ? remoteAddr : request.getRemoteAddr();
}
/**
* 驼峰命名法工具
*
* @return toCamelCase(" hello_world ") == "helloWorld"
* toCapitalizeCamelCase("hello_world") == "HelloWorld"
* toUnderScoreCase("helloWorld") = "hello_world"
*/
public static String toCamelCase(String s) {
if (s == null) {
return null;
}
s = s.toLowerCase();
StringBuilder sb = new StringBuilder(s.length());
boolean upperCase = false;
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (c == SEPARATOR) {
upperCase = true;
} else if (upperCase) {
sb.append(Character.toUpperCase(c));
upperCase = false;
} else {
sb.append(c);
}
}
return sb.toString();
}
/**
* 驼峰命名法工具
*
* @return toCamelCase(" hello_world ") == "helloWorld"
* toCapitalizeCamelCase("hello_world") == "HelloWorld"
* toUnderScoreCase("helloWorld") = "hello_world"
*/
public static String toCapitalizeCamelCase(String s) {
if (s == null) {
return null;
}
s = toCamelCase(s);
return s.substring(0, 1).toUpperCase() + s.substring(1);
}
/**
* 驼峰命名法工具
*
* @return toCamelCase(" hello_world ") == "helloWorld"
* toCapitalizeCamelCase("hello_world") == "HelloWorld"
* toUnderScoreCase("helloWorld") = "hello_world"
*/
public static String toUnderScoreCase(String s) {
if (s == null) {
return null;
}
StringBuilder sb = new StringBuilder();
boolean upperCase = false;
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
boolean nextUpperCase = true;
if (i < (s.length() - 1)) {
nextUpperCase = Character.isUpperCase(s.charAt(i + 1));
}
if ((i > 0) && Character.isUpperCase(c)) {
if (!upperCase || !nextUpperCase) {
sb.append(SEPARATOR);
}
upperCase = true;
} else {
upperCase = false;
}
sb.append(Character.toLowerCase(c));
}
return sb.toString();
}
/**
* 如果不为空,则设置值
*
* @param target
* @param source
*/
public static void setValueIfNotBlank(String target, String source) {
if (isNotBlank(source)) {
target = source;
}
}
/**
* 转换为JS获取对象值,生成三目运算返回结果
*
* @param objectString 对象串
* 例如:row.user.id
* 返回:!row?'':!row.user?'':!row.user.id?'':row.user.id
*/
public static String jsGetVal(String objectString) {
StringBuilder result = new StringBuilder();
StringBuilder val = new StringBuilder();
String[] vals = split(objectString, ".");
for (int i = 0; i < vals.length; i++) {
val.append("." + vals[i]);
result.append("!" + (val.substring(1)) + "?'':");
}
result.append(val.substring(1));
return result.toString();
}
public static String string2Unicode(String string) {
StringBuffer unicode = new StringBuffer();
for (int i = 0; i < string.length(); i++) {
// 取出每一个字符
char c = string.charAt(i);
// 转换为unicode
unicode.append("\\u" + Integer.toHexString(c));
}
return unicode.toString();
}
/**
* unicode 转字符串
*/
public static String unicode2String(String unicode) {
StringBuffer string = new StringBuffer();
String[] hex = unicode.split("\\\\u");
for (int i = 1; i < hex.length; i++) {
// 转换出每一个代码点
int data = Integer.parseInt(hex[i], 16);
// 追加成string
string.append((char) data);
}
return string.toString();
}
/**
* 判断对象或对象数组中每一个对象是否为空: 对象为null,字符序列长度为0,集合类、Map为empty
*
* @param obj
* @return
*/
public static boolean isNullOrEmpty(Object obj) {
if (obj == null)
return true;
if (obj instanceof CharSequence)
return ((CharSequence) obj).length() == 0;
if (obj instanceof Collection)
return ((Collection) obj).isEmpty();
if (obj instanceof Map)
return ((Map) obj).isEmpty();
if (obj instanceof Object[]) {
Object[] object = (Object[]) obj;
if (object.length == 0) {
return true;
}
boolean empty = true;
for (int i = 0; i < object.length; i++) {
if (!isNullOrEmpty(object[i])) {
empty = false;
break;
}
}
return empty;
}
return false;
}
}
本文地址:https://blog.csdn.net/qq_43549747/article/details/111065881