java StringUtil 字符串工具类
import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class StringUtil {
@SuppressWarnings("unchecked")
public static String[] split(String str, String splitsign) {
int index;
if (str == null || splitsign == null) {
return null;
}
ArrayList al = new ArrayList();
while ((index = str.indexOf(splitsign)) != -1) {
al.add(str.substring(0, index));
str = str.substring(index + splitsign.length());
}
al.add(str);
return (String[]) al.toArray(new String[0]);
}
public static String replace(String from, String to, String source) {
if (source == null || from == null || to == null)
return null;
StringBuffer str = new StringBuffer("");
int index = -1;
while ((index = source.indexOf(from)) != -1) {
str.append(source.substring(0, index) + to);
source = source.substring(index + from.length());
index = source.indexOf(from);
}
str.append(source);
return str.toString();
}
public static String htmlencode(String str) {
if (str == null) {
return null;
}
return replace(""", """, replace("<", "<", str));
}
public static String htmldecode(String str) {
if (str == null) {
return null;
}
return replace(""", """, replace("<", "<", str));
}
private static final String _BR = "
";
";
public static String htmlshow(String str) {
if (str == null) {
return null;
}
str = replace("<", "<", str);
str = replace(" ", " ", str);
str = replace("\r\n", _BR, str);
str = replace("\n", _BR, str);
str = replace("\t", " ", str);
return str;
}
public static String toLength(String str, int length) {
if (str == null) {
return null;
}
if (length <= 0) {
return "";
}
try {
if (str.getBytes("GBK").length <= length) {
return str;
}
} catch (Exception e) {
}
StringBuffer buff = new StringBuffer();
int index = 0;
char c;
length -= 3;
while (length > 0) {
c = str.charAt(index);
if (c < 128) {
length--;
} else {
length--;
length--;
}
buff.append(c);
index++;
}
buff.append("...");
return buff.toString();
}
public static boolean isInteger(String str) {
Pattern pattern = Pattern.compile("^[-\\+]?[\\d]+$");
return pattern.matcher(str).matches();
}
public static boolean isDouble(String str) {
Pattern pattern = Pattern.compile("^[-\\+]?\\d+\\.\\d+$");
return pattern.matcher(str).matches();
}
public static boolean isLetter(String str) {
if (str == null || str.length() < 0) {
return false;
}
Pattern pattern = Pattern.compile("[\\w\\.-_]*");
return pattern.matcher(str).matches();
}
public static String parse(String content) {
String email = null;
if (content == null || content.length() < 1) {
return email;
}
// 找出含有@
int beginPos;
int i;
String token = "@";
String preHalf = "";
String sufHalf = "";
beginPos = content.indexOf(token);
if (beginPos > -1) {
// 前项扫描
String s = null;
i = beginPos;
while (i > 0) {
s = content.substring(i - 1, i);
if (isLetter(s))
preHalf = s + preHalf;
else
break;
i--;
}
// 后项扫描
i = beginPos + 1;
while (i < content.length()) {
s = content.substring(i, i + 1);
if (isLetter(s))
sufHalf = sufHalf + s;
else
break;
i++;
}
// 判断合法性
email = preHalf + "@" + sufHalf;
if (isEmail(email)) {
return email;
}
}
return null;
}
public static boolean isEmail(String email) {
if (email == null || email.length() < 1 || email.length() > 256) {
return false;
}
Pattern pattern = Pattern
.compile("^\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*$");
return pattern.matcher(email).matches();
}
public static boolean isChinese(String str) {
Pattern pattern = Pattern.compile("[\u0391-\uFFE5]+$");
return pattern.matcher(str).matches();
}
public static boolean isBlank(String str) {
return str == null || str.trim().length() == 0;
}
public static boolean isPrime(int x) {
if (x <= 7) {
if (x == 2 || x == 3 || x == 5 || x == 7)
return true;
}
int c = 7;
if (x % 2 == 0)
return false;
if (x % 3 == 0)
return false;
if (x % 5 == 0)
return false;
int end = (int) Math.sqrt(x);
while (c <= end) {
if (x % c == 0) {
return false;
}
c += 4;
if (x % c == 0) {
return false;
}
c += 2;
if (x % c == 0) {
return false;
}
c += 4;
if (x % c == 0) {
return false;
}
c += 2;
if (x % c == 0) {
return false;
}
c += 4;
if (x % c == 0) {
return false;
}
c += 6;
if (x % c == 0) {
return false;
}
c += 2;
if (x % c == 0) {
return false;
}
c += 6;
}
return true;
}
public static String hangeToBig(String str) {
double value;
try {
value = Double.parseDouble(str.trim());
} catch (Exception e) {
return null;
}
char[] hunit = { '拾', '佰', '仟' }; // 段内位置表示
char[] vunit = { '万', '亿' }; // 段名表示
char[] digit = { '零', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖' }; // 数字表示
long midVal = (long) (value * 100); // 转化成整形
String valStr = String.valueOf(midVal); // 转化成字符串
String head = valStr.substring(0, valStr.length() - 2); // 取整数部分
String rail = valStr.substring(valStr.length() - 2); // 取小数部分
String prefix = ""; // 整数部分转化的结果
String suffix = ""; // 小数部分转化的结果
// 处理小数点后面的数
if (rail.equals("00")) { // 如果小数部分为0
suffix = "整";
} else {
suffix = digit[rail.charAt(0) - '0'] + "角"
+ digit[rail.charAt(1) - '0'] + "分"; // 否则把角分转化出来
}
// 处理小数点前面的数
char[] chDig = head.toCharArray(); // 把整数部分转化成字符数组
char zero = '0'; // 标志'0'表示出现过0
byte zeroSerNum = 0; // 连续出现0的次数
for (int i = 0; i < chDig.length; i++) { // 循环处理每个数字
int idx = (chDig.length - i - 1) % 4; // 取段内位置
int vidx = (chDig.length - i - 1) / 4; // 取段位置
if (chDig[i] == '0') { // 如果当前字符是0
zeroSerNum++; // 连续0次数递增
if (zero == '0') { // 标志
zero = digit[0];
} else if (idx == 0 && vidx > 0 && zeroSerNum < 4) {
prefix += vunit[vidx - 1];
zero = '0';
}
continue;
}
zeroSerNum = 0; // 连续0次数清零
if (zero != '0') { // 如果标志不为0,则加上,例如万,亿什么的
prefix += zero;
zero = '0';
}
prefix += digit[chDig[i] - '0']; // 转化该数字表示
if (idx > 0)
prefix += hunit[idx - 1];
if (idx == 0 && vidx > 0) {
prefix += vunit[vidx - 1]; // 段结束位置应该加上段名如万,亿
}
}
if (prefix.length() > 0)
prefix += '圆'; // 如果整数部分存在,则有圆的字样
return prefix + suffix; // 返回正确表示
}
@SuppressWarnings("unused")
private static String removeSameString(String str) {
Set mLinkedSet = new LinkedHashSet();// set集合的特征：其子集不可以重复
String[] strArray = str.split(" ");// 根据空格(正则表达式)分割字符串
StringBuffer sb = new StringBuffer();
for (int i = 0; i < strArray.length; i++) {
if (!mLinkedSet.contains(strArray[i])) {
mLinkedSet.add(strArray[i]);
sb.append(strArray[i] + " ");
}
}
System.out.println(mLinkedSet);
return sb.toString();
}
public static String encoding(String src) {
if (src == null)
return "";
StringBuilder result = new StringBuilder();
if (src != null) {
src = src.trim();
for (int pos = 0; pos < src.length(); pos++) {
switch (src.charAt(pos)) {
case '"':
result.append(""");
break;
case '<':
result.append("<");
break;
case '>':
result.append(">");
break;
case '\'':
result.append("'");
break;
case '&':
result.append("&");
break;
case '%':
result.append("&pc;");
break;
case '_':
result.append("&ul;");
break;
case '#':
result.append("&shap;");
break;
case '?':
result.append("&ques;");
break;
default:
result.append(src.charAt(pos));
break;
}
}
}
return result.toString();
}
public static boolean isHandset(String handset) {
try {
String regex = "^1[\\d]{10}$";
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(handset);
return matcher.matches();
} catch (RuntimeException e) {
return false;
}
}
public static String decoding(String src) {
if (src == null)
return "";
String result = src;
result = result.replace(""", """).replace("'", "\'");
result = result.replace("<", "<").replace(">", ">");
result = result.replace("&", "&");
result = result.replace("&pc;", "%").replace("&ul", "_");
result = result.replace("&shap;", "#").replace("&ques", "?");
return result;
}
public static void main(String[] args) {
String source = "abcdefgabcdefgabcdefgabcdefgabcdefgabcdefg";
String from = "efg";
String to = "房贺威";
System.out.println("在字符串source中，用to替换from，替换结果为："
+ replace(from, to, source));
System.out.println("返回指定字节长度的字符串："
+ toLength("abcdefgabcdefgabcdefgabcdefgabcdefgabcdefg", 9));
System.out.println("判断是否为整数：" + isInteger("+0"));
System.out.println("判断是否为浮点数，包括double和float：" + isDouble("+0.36"));
System.out.println("判断输入的字符串是否符合Email样式：" +
isEmail("fhwbj@163.com"));
System.out.println("判断输入的字符串是否为纯汉字：" + isChinese("你好！"));
System.out.println("判断输入的数据是否是质数：" + isPrime(12));
System.out.println("人民币转换成大写：" + hangeToBig("10019658"));
System.out.println("去掉字符串中重复的子字符串：" + removeSameString("100 100 9658"));
System.out.println("过滤特殊字符：" + encoding("100"s<>fdsd100 9658"));
System.out.println("判断是不是合法的手机号码：" + isHandset("15981807340"));
System.out.println("从字符串中取值Email：" + parse("159818 fwhbj@163.com07340"));
}
}