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public static boolean validateEmail(String email){
//Pattern pattern = Pattern.compile("[0-9a-zA-Z]*.[0-9a-zA-Z]*@[a-zA-Z]*.[a-zA-Z]*", Pattern.LITERAL);
if(email == null){
return false;
}

//ÑéÖ¤¿ªÊ¼


//²»ÄÜÓÐÁ¬ÐøµÄ.
if(email.indexOf("..") != -1){
return false;
}

//±ØÐë´øÓÐ@
int atCharacter = email.indexOf("@");
if (atCharacter == -1) {
return false;
}

//×îºóÒ»¸ö.±ØÐëÔÚ@Ö®ºó,ÇÒ²»ÄÜÁ¬Ðø³öÏÖ
if(atCharacter > email.lastIndexOf('.') || atCharacter+1 == email.lastIndexOf('.')){
return false;
}

//²»ÄÜÒÔ.,@½áÊøºÍ¿ªÊ¼
if (email.endsWith(".") || email.endsWith("@") || email.startsWith(".") || email.startsWith("@")) {
return false;
}

return true;
}

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2. new File(String filePath);½ÓÊÜÕýÈ·URI¸ñʽµÄ²ÎÊýº ......

Effective Java ѧϰ±Ê¼Ç(4)

Õâ¸öÔ­ÔòºÜ¼òµ¥£¬¾ÍÊÇʹÓÃ˽Óй¹Ô캯Êý·ÀÖ¹À౻ʵÀý»¯¡£ ÓÐʱ£¬ÎÒÃÇ»áдһЩ¹¤¾ßÀ࣬Èçjava.lang.Math »òÊÇ java.util.Arrays, ÕâЩÀàÖж¼ÊǾ²Ì¬º¯Êý£¬ÔÚÉè¼ÆµÄʱºò£¬ÕâЩÀಢ²»ÊÇÓÃÀ´±»ÊµÀý»¯µÄ¡£Õâ¸öʱºò£¬¾ÍºÜÓбØÒª°Ñ¹¹Ô캯Êý˽Óл¯¡£ public class UtilityClass {

private UtilityClass() {
throw ne ......

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public static String bytes2HexString(byte[] b) {
  String ret = "";
  for (int i = 0; i < b.length; i++) {
   String hex = Integer.toHexString(b[ i ] & 0xFF);
   if (hex.length() == 1) {
    hex = '0' ......

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<Resource name="jdbc/testDB" auth="Container"
type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/testDB">
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>
<parameter>
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