JAVA正则表达式工具类

摘要: JAVA正则表达式工具类

package com.common.util;

import java.text.DecimalFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;

public class CheckData {
public CheckData()
{
}

public static String checkString(String start)
{
String end = null;
if(start == null)
return "";
int length = start.length();
int sub = start.indexOf("'");
if(sub == -1)
end = start;
else
if(length == sub)
end = (new StringBuilder(String.valueOf(start))).append("'").toString();
else
end = (new StringBuilder(String.valueOf(start.substring(0, sub + 1)))).append("'").append(checkString(start.substring(sub + 1, length))).toString();
return end;
}

/***
* 判断是否为中文
* @param str
* @return
*/
public static boolean isCn(String str)
{

if(str==null || str.equals("")){
return false;
}
Pattern pattern = Pattern.compile("^[\u4e00-\u9fa5]+$");
Matcher isNum = pattern.matcher(str);
if( !isNum.matches() )
{
return false;

}
return true;
}

/***
* 判断是否为数字
* @param str
* @return
*/
public static boolean isNumer(String str)
{
if(str==null || str.equals("")){
return false;
}
Pattern pattern = Pattern.compile("[0-9]*");
Matcher isNum = pattern.matcher(str);
if( !isNum.matches() )
{
return false;
}
return true;
}
/***
* 判断是否为字母
* @param str
* @return
*/
public static boolean isLetters(String str)
{
if(str==null || str.equals("")){
return false;
}
Pattern pattern = Pattern.compile("[a-zA-Z]+");
Matcher isNum = pattern.matcher(str);
if( !isNum.matches() )
{
return false;
}
return true;
}

/******************时间转换********************/
public String getDate(){
SimpleDateFormat df = new SimpleDateFormat("yyyyMMddhhmmss");//设置日期格式
String date=df.format(new Date());// new Date()为获取当前系统时间
return date;
}
public Date getDate(String reqDate){
try {
SimpleDateFormat df = new SimpleDateFormat("yyyyMMddhhmmss");
Date date= df.parse(reqDate);
return date;
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
}
}

/******************数据类型转换********************/
public static Long getLong(String str){
if(str!=null && !str.equals("")){
return Long.parseLong(str);
}else{
return null;
}
}
public static Integer getInteger(String str){
if(str!=null && !str.equals("")){
return Integer.parseInt(str);
}else{
return null;
}
}
public static String getDouble(Double dob){
DecimalFormat df=new DecimalFormat("0.00");
return df.format(dob);
}
/**
* 获取客户端IP
* @param request
* @return
*/
public static String getIpAddr(HttpServletRequest request) {
String ip = request.getHeader("x-forwarded-for");
if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("Proxy-Client-IP");
}
if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("WL-Proxy-Client-IP");
}
if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
}
return ip;
}
public static String utf8Togb2312(String str){
StringBuffer sb = new StringBuffer();
for(int i=0; i<str.length(); i++) {
char c = str.charAt(i);
switch (c) {
case '+':
sb.append(' ');
break;
case '%':
try {
sb.append((char)Integer.parseInt(
str.substring(i+1,i+3),16));
}
catch (NumberFormatException e) {
throw new IllegalArgumentException();
}
i += 2;
break;
default:
sb.append(c);
break;
}
}
// Undo conversion to external encoding
String result = sb.toString();
String res=null;
try{
byte[] inputBytes = result.getBytes("8859_1");
res= new String(inputBytes,"UTF-8");
}
catch(Exception e){}
return res;
}

}