以前编写JSP网站时写的一些工具函数.

答案：  
初学JSP时,写了一些工具函数因为不太会用JAVA下的正则表达式也只能这么写啦!发出来让大家批评批评提点意见!有几个函数不算是自己写的希望爱挑剌的朋友嘴下留情!我是新手我怕谁,脸皮不行的人水平也上不去呀.嘻嘻..
package mxzc.web.strctrl;
public class StringCtrl
{/********************************************
public synchronized String HTMLcode(String TXTcode)   功能:文本替换
public synchronized String Unhtmlcode(String str)   功能:(不完全)反文本替换
public synchronized String Unhtmlcodea(String str)   功能:反文本替换
public synchronized boolean emailcheck (String email)   功能:检查一个字符串是否符合E-Mail
public synchronized boolean isemailstr(String email)   功能:检查一个字符串是否符合E-Mail
public synchronized boolean isqqstr(String qq)    功能:检查一个字符串是否符合QQ
public synchronized boolean isnumstr(String num)   功能:检查一个字符串是否为一数字串
public synchronized String userstrlow(String user)   功能:替换用户名中不合法的部分
public synchronized boolean userstrchk(String user)   功能:检查字符串是否符合用户名法则
public synchronized boolean istelstr(String tel)   功能:检查字符串是否为TEL
public synchronized boolean urlcheck(String url)   功能:检查字符串是否为URL
public synchronized String isotogbk(String iso)    功能:ISO9006-1码转换为GBK
public synchronized String gbktoiso(String gbk)    功能:GBK码转换为ISO9006-1
public synchronized String dostrcut(String oldstr,int length)  功能:按汉字长换行(英文按半个字长)
public synchronized String inttodateshow(int datenum)   功能:将1900年至时间的秒数换为日期字符串
public synchronized String nowdateshow()    功能:显示当前日期
public synchronized java.util.Date inttodate(int datenum)  功能:将秒数转换为日期
public synchronized int datetoint()     功能:将时间换为从1900年至今的秒数
public synchronized int datetoint(java.util.Date d)   功能:将时间换为从1900年至时间的秒数
public synchronized String overlengthcut(String str,int length)  功能:截取前几个字符,单位为汉字字长
public synchronized String replace(String str,String suba,String subb) 功能:字符串替换
*********************************************/
private static final String isostr="ISO8859-1";
private static final String gbkstr="GBK";
public StringCtrl()
{
}
public synchronized boolean emailcheck (String email)
{
if(email==null)return false;
if(email.length()<6)return false;
if(email.indexOf("@")<2)return false;
if(email.indexOf(".")<4)return false;
if(email.endsWith(".")||email.endsWith("@"))return false;
if(email.lastIndexOf("@")>email.lastIndexOf(".")-1)return false;
if(email.lastIndexOf("@")!=email.indexOf("@"))return false;
String[] lowstr={"\'","\"","\n","&","\t","\r","<",">","/","\\","#"};
for(int i=0;i<lowstr.length;i++)if(email.indexOf("lowstr")>0)return false;
return true;
}
public synchronized boolean isemailstr(String email)
{
if(email==null)return false;
if(email.indexOf("@")==-1||email.indexOf(".")==-1||email.length()<6)return false;
return true;
}
public synchronized boolean isqqstr(String qq)
{
if(qq==null)return false;
if(qq.length()>12)return false;
if(qq.length()<5)return false;
for(int i=0;i<qq.length();i++)
if(!(((int)qq.charAt(i))<=57&&((int)qq.charAt(i))>=48))return false;
return true;
}
public synchronized boolean isnumstr(String num)
{
if(num==null)return false;
if(num.length()<1)return false;
for(int i=0;i<num.length();i++)
if(!(((int)num.charAt(i))<=57&&((int)num.charAt(i))>=48))return false;
return true;
}
public synchronized String userstrlow(String user)
{
String newuserstr=user.trim();
char[] lowstr={'\'','\"','\n','&','\t','\r','<','>','/','\\','#'};
for(int i=0;i<lowstr.length;i++)
newuserstr=newuserstr.replace(lowstr[i],'+');
return newuserstr;
}
public synchronized boolean userstrchk(String user)
{
String newuserstr=user.trim();
char[] lowstr={'\'','\"','\n','&','\t','\r','<','>','/','\\','#','~','`','!','@','$','%','^','*','(',')','-','_','+','=','|','?',',',';','.'};
for(int i=0;i<lowstr.length;i++)
newuserstr=newuserstr.replace(lowstr[i],'+');
return (user.equals(newuserstr))?true:false;
}
public synchronized boolean istelstr(String tel)
{
if(tel==null)return false;
if(tel.length()<1)return false;
if(tel.length()>32)return false;
for(int i=0;i<tel.length();i++)
if(!(((int)tel.charAt(i))<=57&&((int)tel.charAt(i))>=48))if(tel.charAt(i)!='-')return false;
return true;
}
public synchronized boolean urlcheck(String url)
{
if(url==null)return false;
if(url.length()<10)return false;
String urls=url.toLowerCase();
if(!urls.startsWith("http://"))return false;
if(url.indexOf("<")>0||url.indexOf(">")>0)return false;
return true;
}
public synchronized String isotogbk(String iso)throws Exception
{
 if(iso!=null)return (new String(iso.getBytes(isostr),gbkstr));
 if(iso.length()<1)return "";
 return null;
}
public synchronized String gbktoiso(String gbk)throws Exception
{
 if(gbk!=null)return (new String(gbk.getBytes(gbkstr),isostr));
 if(gbk.length()<1)return "";
 return null;
}
public synchronized String HTMLcode(String TXTcode)
{
 String newstr="";
 if(TXTcode==null)return "";
 newstr=TXTcode;
 newstr=replace(newstr,"&","&amp;");
 newstr=replace(newstr,"\"","&quot;");
 newstr=replace(newstr," ","&nbsp;");
 newstr=replace(newstr,"<","&lt;");
 newstr=replace(newstr,">","&gt;");
 newstr=replace(newstr,"\'","&#00039;");
 return newstr;
}
public synchronized String Unhtmlcode(String str)
{
 String newstr="";
 if(str==null)return "";
 if(str.length()<1)return "";
 newstr=str;
 newstr=replace(newstr,"&amp;","&");
 //newstr=replace(newstr,"&quot;","\"");
 newstr=replace(newstr,"&nbsp;"," ");
 newstr=replace(newstr,"&quot;","\"");
 //newstr=replace(newstr,"&lt;","<");
 //newstr=replace(newstr,"&gt;",">");
 newstr=replace(newstr,"&#00039;","\'");
 return newstr;
}
public synchronized String Unhtmlcodea(String str)
{
 String newstr="";
 if(str==null)return "";
 if(str.length()<1)return "";
 newstr=str;
 newstr=replace(newstr,"&amp;","&");
 newstr=replace(newstr,"&quot;","\"");
 newstr=replace(newstr,"&nbsp;"," ");
 newstr=replace(newstr,"&lt;","<");
 newstr=replace(newstr,"&gt;",">");
 newstr=replace(newstr,"&#00039;","\'");
 return newstr;
}
public synchronized String dostrcut(String oldstr,int length)
{
 int i=0;
 int j=0;
 int k=0;
 String newstr="";
 if(oldstr==null)return "";
 if(length<=0)return "";
 for(i=0;i<oldstr.length();i++)
 {
  if(oldstr.charAt(i)=='\n')j=0;
  else if(((int)(oldstr.charAt(i)))>255)j+=2;
  else j++;
  if((j/2)>=length)
  {
   newstr=newstr.concat(oldstr.substring(k,i)+"\n");
   k=i;
   j=0;
  }
 }
 newstr=newstr.concat(oldstr

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