Java 有哪些好的电子邮件地址验证库？是否有任何替代公共验证器的方法？
jon077
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19 回答
261
使用官方的 java email 包是最简单的：
public static boolean isValidEmailAddress(String email) {
boolean result = true;
try {
InternetAddress emailAddr = new InternetAddress(email);
emailAddr.validate();
} catch (AddressException ex) {
result = false;
}
return result;
}
于 2011-05-09T01:53:03.833 回答
134
Apache Commons 通常被称为一个可靠的项目。但是请记住，如果您想确保它是真实的电子邮件并且所有者希望它在您的网站上使用，您仍然必须向该地址发送验证电子邮件。
编辑：有一个错误，它对域的限制过于严格，导致它不接受来自新 TLD 的有效电子邮件。
此错误已于 03/Jan/15 02:48 在commons-validator版本 1.4.1中解决
于 2009-03-08T23:57:01.030 回答
91
如其他答案中所述，可以使用 Apache Commons 验证器。
pom.xml：
<dependency>
<groupId>commons-validator</groupId>
<artifactId>commons-validator</artifactId>
<version>1.4.1</version>
</dependency>
构建.gradle：
compile 'commons-validator:commons-validator:1.4.1'
进口：
import org.apache.commons.validator.routines.EmailValidator;
编码：
String email = "myName@example.com";
boolean valid = EmailValidator.getInstance().isValid(email);
并允许本地地址
boolean allowLocal = true;
boolean valid = EmailValidator.getInstance(allowLocal).isValid(email);
于 2014-11-01T08:55:39.170 回答
71
迟到的答案，但我认为这很简单且值得：
public boolean isValidEmailAddress(String email) {
String ePattern = "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\])|(([a-zA-Z\\-0-9]+\\.)+[a-zA-Z]{2,}))$";
java.util.regex.Pattern p = java.util.regex.Pattern.compile(ePattern);
java.util.regex.Matcher m = p.matcher(email);
return m.matches();
}
测试用例：
出于生产目的，域名验证应在网络上执行。
于 2013-04-17T10:49:49.773 回答
21
如果您尝试从客户端接收表单验证，或者只是 bean 验证 - 保持简单。最好进行松散的电子邮件验证，而不是进行严格的验证并拒绝某些人（例如，当他们试图注册您的 Web 服务时）。由于电子邮件的用户名部分几乎允许使用任何内容，并且每个月都会添加如此多的新域（例如 .company、.entreprise、.estate），因此不进行限制会更安全：
Pattern pattern = Pattern.compile("^.+@.+\\..+$");
Matcher matcher = pattern.matcher(email);
于 2014-06-20T06:08:20.800 回答
7
迟到的问题，在这里，但是：我在这个地址维护一个类：http: //lacinato.com/cm/software/emailrelated/emailaddress
它基于 Les Hazlewood 的课程，但有许多改进并修复了一些错误。阿帕奇许可证。
我相信它是 Java 中功能最强大的电子邮件解析器，而且我还没有看到任何语言的功能更强大，尽管可能有一个。它不是词法分析器风格的解析器，但使用了一些复杂的 java 正则表达式，因此效率不高，但我的公司已经用它解析了超过 100 亿个实际地址：它当然可以用于高性能情况。也许每年一次它会遇到一个导致正则表达式堆栈溢出的地址（适当地），但这些是垃圾邮件地址，它们有数百或数千个字符长，带有许多引号和括号等。
RFC 2822和相关规范在电子邮件地址方面确实非常宽松，所以像这样的类对于大多数用途来说是多余的。例如，以下是合法地址，根据规范、空格和所有：
"<bob \" (here) " < (hi there) "bob(the man)smith" (hi) @ (there) example.com (hello) > (again)
没有邮件服务器允许这样做，但是这个类可以解析它（并将其重写为可用的形式）。
我们发现现有的 Java 电子邮件解析器选项不够耐用（意味着它们都无法解析某些有效地址），因此我们创建了这个类。
该代码有据可查，并且有许多易于更改的选项来允许或禁止某些电子邮件表单。它还提供了许多方法来访问地址的某些部分（左侧、右侧、个人姓名、评论等），解析/验证邮箱列表标题，解析/验证返回路径（这在标题中是唯一的）等等。
编写的代码具有 javamail 依赖项，但如果您不想要它提供的次要功能，则可以轻松删除。
于 2012-10-30T06:36:22.690 回答
7
我只是想知道为什么没有人想出@EmailHibernate Validator 的附加约束。验证器本身是EmailValidator.
于 2014-04-01T02:56:39.507 回答
5
Les Hazlewood 使用 Java 正则表达式编写了一个非常彻底的符合 RFC 2822 的电子邮件验证器类。您可以在http://www.leshazlewood.com/?p=23找到它。但是，它的彻底性（或 Java RE 实现）导致效率低下 - 请阅读有关长地址解析时间的评论。
于 2009-08-24T10:49:27.073 回答
3
我在 Zend_Validator_Email 中移植了一些代码：
@FacesValidator("emailValidator")
public class EmailAddressValidator implements Validator {
private String localPart;
private String hostName;
private boolean domain = true;
Locale locale;
ResourceBundle bundle;
private List<FacesMessage> messages = new ArrayList<FacesMessage>();
private HostnameValidator hostnameValidator;
@Override
public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
setOptions(component);
String email = (String) value;
boolean result = true;
Pattern pattern = Pattern.compile("^(.+)@([^@]+[^.])$");
Matcher matcher = pattern.matcher(email);
locale = context.getViewRoot().getLocale();
bundle = ResourceBundle.getBundle("com.myapp.resources.validationMessages", locale);
boolean length = true;
boolean local = true;
if (matcher.find()) {
localPart = matcher.group(1);
hostName = matcher.group(2);
if (localPart.length() > 64 || hostName.length() > 255) {
length = false;
addMessage("enterValidEmail", "email.AddressLengthExceeded");
}
if (domain == true) {
hostnameValidator = new HostnameValidator();
hostnameValidator.validate(context, component, hostName);
}
local = validateLocalPart();
if (local && length) {
result = true;
} else {
result = false;
}
} else {
result = false;
addMessage("enterValidEmail", "invalidEmailAddress");
}
if (result == false) {
throw new ValidatorException(messages);
}
}
private boolean validateLocalPart() {
// First try to match the local part on the common dot-atom format
boolean result = false;
// Dot-atom characters are: 1*atext *("." 1*atext)
// atext: ALPHA / DIGIT / and "!", "#", "$", "%", "&", "'", "*",
// "+", "-", "/", "=", "?", "^", "_", "`", "{", "|", "}", "~"
String atext = "a-zA-Z0-9\\u0021\\u0023\\u0024\\u0025\\u0026\\u0027\\u002a"
+ "\\u002b\\u002d\\u002f\\u003d\\u003f\\u005e\\u005f\\u0060\\u007b"
+ "\\u007c\\u007d\\u007e";
Pattern regex = Pattern.compile("^["+atext+"]+(\\u002e+["+atext+"]+)*$");
Matcher matcher = regex.matcher(localPart);
if (matcher.find()) {
result = true;
} else {
// Try quoted string format
// Quoted-string characters are: DQUOTE *([FWS] qtext/quoted-pair) [FWS] DQUOTE
// qtext: Non white space controls, and the rest of the US-ASCII characters not
// including "\" or the quote character
String noWsCtl = "\\u0001-\\u0008\\u000b\\u000c\\u000e-\\u001f\\u007f";
String qText = noWsCtl + "\\u0021\\u0023-\\u005b\\u005d-\\u007e";
String ws = "\\u0020\\u0009";
regex = Pattern.compile("^\\u0022(["+ws+qText+"])*["+ws+"]?\\u0022$");
matcher = regex.matcher(localPart);
if (matcher.find()) {
result = true;
} else {
addMessage("enterValidEmail", "email.AddressDotAtom");
addMessage("enterValidEmail", "email.AddressQuotedString");
addMessage("enterValidEmail", "email.AddressInvalidLocalPart");
}
}
return result;
}
private void addMessage(String detail, String summary) {
String detailMsg = bundle.getString(detail);
String summaryMsg = bundle.getString(summary);
messages.add(new FacesMessage(FacesMessage.SEVERITY_ERROR, summaryMsg, detailMsg));
}
private void setOptions(UIComponent component) {
Boolean domainOption = Boolean.valueOf((String) component.getAttributes().get("domain"));
//domain = (domainOption == null) ? true : domainOption.booleanValue();
}
}
使用主机名验证器，如下所示：
@FacesValidator("hostNameValidator")
public class HostnameValidator implements Validator {
private Locale locale;
private ResourceBundle bundle;
private List<FacesMessage> messages;
private boolean checkTld = true;
private boolean allowLocal = false;
private boolean allowDNS = true;
private String tld;
private String[] validTlds = {"ac", "ad", "ae", "aero", "af", "ag", "ai",
"al", "am", "an", "ao", "aq", "ar", "arpa", "as", "asia", "at", "au",
"aw", "ax", "az", "ba", "bb", "bd", "be", "bf", "bg", "bh", "bi", "biz",
"bj", "bm", "bn", "bo", "br", "bs", "bt", "bv", "bw", "by", "bz", "ca",
"cat", "cc", "cd", "cf", "cg", "ch", "ci", "ck", "cl", "cm", "cn", "co",
"com", "coop", "cr", "cu", "cv", "cx", "cy", "cz", "de", "dj", "dk",
"dm", "do", "dz", "ec", "edu", "ee", "eg", "er", "es", "et", "eu", "fi",
"fj", "fk", "fm", "fo", "fr", "ga", "gb", "gd", "ge", "gf", "gg", "gh",
"gi", "gl", "gm", "gn", "gov", "gp", "gq", "gr", "gs", "gt", "gu", "gw",
"gy", "hk", "hm", "hn", "hr", "ht", "hu", "id", "ie", "il", "im", "in",
"info", "int", "io", "iq", "ir", "is", "it", "je", "jm", "jo", "jobs",
"jp", "ke", "kg", "kh", "ki", "km", "kn", "kp", "kr", "kw", "ky", "kz",
"la", "lb", "lc", "li", "lk", "lr", "ls", "lt", "lu", "lv", "ly", "ma",
"mc", "md", "me", "mg", "mh", "mil", "mk", "ml", "mm", "mn", "mo",
"mobi", "mp", "mq", "mr", "ms", "mt", "mu", "museum", "mv", "mw", "mx",
"my", "mz", "na", "name", "nc", "ne", "net", "nf", "ng", "ni", "nl",
"no", "np", "nr", "nu", "nz", "om", "org", "pa", "pe", "pf", "pg", "ph",
"pk", "pl", "pm", "pn", "pr", "pro", "ps", "pt", "pw", "py", "qa", "re",
"ro", "rs", "ru", "rw", "sa", "sb", "sc", "sd", "se", "sg", "sh", "si",
"sj", "sk", "sl", "sm", "sn", "so", "sr", "st", "su", "sv", "sy", "sz",
"tc", "td", "tel", "tf", "tg", "th", "tj", "tk", "tl", "tm", "tn", "to",
"tp", "tr", "travel", "tt", "tv", "tw", "tz", "ua", "ug", "uk", "um",
"us", "uy", "uz", "va", "vc", "ve", "vg", "vi", "vn", "vu", "wf", "ws",
"ye", "yt", "yu", "za", "zm", "zw"};
private Map<String, Map<Integer, Integer>> idnLength;
private void init() {
Map<Integer, Integer> biz = new HashMap<Integer, Integer>();
biz.put(5, 17);
biz.put(11, 15);
biz.put(12, 20);
Map<Integer, Integer> cn = new HashMap<Integer, Integer>();
cn.put(1, 20);
Map<Integer, Integer> com = new HashMap<Integer, Integer>();
com.put(3, 17);
com.put(5, 20);
Map<Integer, Integer> hk = new HashMap<Integer, Integer>();
hk.put(1, 15);
Map<Integer, Integer> info = new HashMap<Integer, Integer>();
info.put(4, 17);
Map<Integer, Integer> kr = new HashMap<Integer, Integer>();
kr.put(1, 17);
Map<Integer, Integer> net = new HashMap<Integer, Integer>();
net.put(3, 17);
net.put(5, 20);
Map<Integer, Integer> org = new HashMap<Integer, Integer>();
org.put(6, 17);
Map<Integer, Integer> tw = new HashMap<Integer, Integer>();
tw.put(1, 20);
Map<Integer, Integer> idn1 = new HashMap<Integer, Integer>();
idn1.put(1, 20);
Map<Integer, Integer> idn2 = new HashMap<Integer, Integer>();
idn2.put(1, 20);
Map<Integer, Integer> idn3 = new HashMap<Integer, Integer>();
idn3.put(1, 20);
Map<Integer, Integer> idn4 = new HashMap<Integer, Integer>();
idn4.put(1, 20);
idnLength = new HashMap<String, Map<Integer, Integer>>();
idnLength.put("BIZ", biz);
idnLength.put("CN", cn);
idnLength.put("COM", com);
idnLength.put("HK", hk);
idnLength.put("INFO", info);
idnLength.put("KR", kr);
idnLength.put("NET", net);
idnLength.put("ORG", org);
idnLength.put("TW", tw);
idnLength.put("ایران", idn1);
idnLength.put("中国", idn2);
idnLength.put("公司", idn3);
idnLength.put("网络", idn4);
messages = new ArrayList<FacesMessage>();
}
public HostnameValidator() {
init();
}
@Override
public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
String hostName = (String) value;
locale = context.getViewRoot().getLocale();
bundle = ResourceBundle.getBundle("com.myapp.resources.validationMessages", locale);
Pattern ipPattern = Pattern.compile("^[0-9a-f:\\.]*$", Pattern.CASE_INSENSITIVE);
Matcher ipMatcher = ipPattern.matcher(hostName);
if (ipMatcher.find()) {
addMessage("hostname.IpAddressNotAllowed");
throw new ValidatorException(messages);
}
boolean result = false;
// removes last dot (.) from hostname
hostName = hostName.replaceAll("(\\.)+$", "");
String[] domainParts = hostName.split("\\.");
boolean status = false;
// Check input against DNS hostname schema
if ((domainParts.length > 1) && (hostName.length() > 4) && (hostName.length() < 255)) {
status = false;
dowhile:
do {
// First check TLD
int lastIndex = domainParts.length - 1;
String domainEnding = domainParts[lastIndex];
Pattern tldRegex = Pattern.compile("([^.]{2,10})", Pattern.CASE_INSENSITIVE);
Matcher tldMatcher = tldRegex.matcher(domainEnding);
if (tldMatcher.find() || domainEnding.equals("ایران")
|| domainEnding.equals("中国")
|| domainEnding.equals("公司")
|| domainEnding.equals("网络")) {
// Hostname characters are: *(label dot)(label dot label); max 254 chars
// label: id-prefix [*ldh{61} id-prefix]; max 63 chars
// id-prefix: alpha / digit
// ldh: alpha / digit / dash
// Match TLD against known list
tld = (String) tldMatcher.group(1).toLowerCase().trim();
if (checkTld == true) {
boolean foundTld = false;
for (int i = 0; i < validTlds.length; i++) {
if (tld.equals(validTlds[i])) {
foundTld = true;
}
}
if (foundTld == false) {
status = false;
addMessage("hostname.UnknownTld");
break dowhile;
}
}
/**
* Match against IDN hostnames
* Note: Keep label regex short to avoid issues with long patterns when matching IDN hostnames
*/
List<String> regexChars = getIdnRegexChars();
// Check each hostname part
int check = 0;
for (String domainPart : domainParts) {
// Decode Punycode domainnames to IDN
if (domainPart.indexOf("xn--") == 0) {
domainPart = decodePunycode(domainPart.substring(4));
}
// Check dash (-) does not start, end or appear in 3rd and 4th positions
if (domainPart.indexOf("-") == 0
|| (domainPart.length() > 2 && domainPart.indexOf("-", 2) == 2 && domainPart.indexOf("-", 3) == 3)
|| (domainPart.indexOf("-") == (domainPart.length() - 1))) {
status = false;
addMessage("hostname.DashCharacter");
break dowhile;
}
// Check each domain part
boolean checked = false;
for (int key = 0; key < regexChars.size(); key++) {
String regexChar = regexChars.get(key);
Pattern regex = Pattern.compile(regexChar);
Matcher regexMatcher = regex.matcher(domainPart);
status = regexMatcher.find();
if (status) {
int length = 63;
if (idnLength.containsKey(tld.toUpperCase())
&& idnLength.get(tld.toUpperCase()).containsKey(key)) {
length = idnLength.get(tld.toUpperCase()).get(key);
}
int utf8Length;
try {
utf8Length = domainPart.getBytes("UTF8").length;
if (utf8Length > length) {
addMessage("hostname.InvalidHostname");
} else {
checked = true;
break;
}
} catch (UnsupportedEncodingException ex) {
Logger.getLogger(HostnameValidator.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
if (checked) {
++check;
}
}
// If one of the labels doesn't match, the hostname is invalid
if (check != domainParts.length) {
status = false;
addMessage("hostname.InvalidHostnameSchema");
}
} else {
// Hostname not long enough
status = false;
addMessage("hostname.UndecipherableTld");
}
} while (false);
if (status == true && allowDNS) {
result = true;
}
} else if (allowDNS == true) {
addMessage("hostname.InvalidHostname");
throw new ValidatorException(messages);
}
// Check input against local network name schema;
Pattern regexLocal = Pattern.compile("^(([a-zA-Z0-9\\x2d]{1,63}\\x2e)*[a-zA-Z0-9\\x2d]{1,63}){1,254}$", Pattern.CASE_INSENSITIVE);
boolean checkLocal = regexLocal.matcher(hostName).find();
if (allowLocal && !status) {
if (checkLocal) {
result = true;
} else {
// If the input does not pass as a local network name, add a message
result = false;
addMessage("hostname.InvalidLocalName");
}
}
// If local network names are not allowed, add a message
if (checkLocal && !allowLocal && !status) {
result = false;
addMessage("hostname.LocalNameNotAllowed");
}
if (result == false) {
throw new ValidatorException(messages);
}
}
private void addMessage(String msg) {
String bundlMsg = bundle.getString(msg);
messages.add(new FacesMessage(FacesMessage.SEVERITY_ERROR, bundlMsg, bundlMsg));
}
/**
* Returns a list of regex patterns for the matched TLD
* @param tld
* @return
*/
private List<String> getIdnRegexChars() {
List<String> regexChars = new ArrayList<String>();
regexChars.add("^[a-z0-9\\x2d]{1,63}$");
Document doc = null;
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
try {
InputStream validIdns = getClass().getClassLoader().getResourceAsStream("com/myapp/resources/validIDNs_1.xml");
DocumentBuilder builder = factory.newDocumentBuilder();
doc = builder.parse(validIdns);
doc.getDocumentElement().normalize();
} catch (SAXException ex) {
Logger.getLogger(HostnameValidator.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(HostnameValidator.class.getName()).log(Level.SEVERE, null, ex);
} catch (ParserConfigurationException ex) {
Logger.getLogger(HostnameValidator.class.getName()).log(Level.SEVERE, null, ex);
}
// prepare XPath
XPath xpath = XPathFactory.newInstance().newXPath();
NodeList nodes = null;
String xpathRoute = "//idn[tld=\'" + tld.toUpperCase() + "\']/pattern/text()";
try {
XPathExpression expr;
expr = xpath.compile(xpathRoute);
Object res = expr.evaluate(doc, XPathConstants.NODESET);
nodes = (NodeList) res;
} catch (XPathExpressionException ex) {
Logger.getLogger(HostnameValidator.class.getName()).log(Level.SEVERE, null, ex);
}
for (int i = 0; i < nodes.getLength(); i++) {
regexChars.add(nodes.item(i).getNodeValue());
}
return regexChars;
}
/**
* Decode Punycode string
* @param encoded
* @return
*/
private String decodePunycode(String encoded) {
Pattern regex = Pattern.compile("([^a-z0-9\\x2d]{1,10})", Pattern.CASE_INSENSITIVE);
Matcher matcher = regex.matcher(encoded);
boolean found = matcher.find();
if (encoded.isEmpty() || found) {
// no punycode encoded string, return as is
addMessage("hostname.CannotDecodePunycode");
throw new ValidatorException(messages);
}
int separator = encoded.lastIndexOf("-");
List<Integer> decoded = new ArrayList<Integer>();
if (separator > 0) {
for (int x = 0; x < separator; ++x) {
decoded.add((int) encoded.charAt(x));
}
} else {
addMessage("hostname.CannotDecodePunycode");
throw new ValidatorException(messages);
}
int lengthd = decoded.size();
int lengthe = encoded.length();
// decoding
boolean init = true;
int base = 72;
int index = 0;
int ch = 0x80;
int indexeStart = (separator == 1) ? (separator + 1) : 0;
for (int indexe = indexeStart; indexe < lengthe; ++lengthd) {
int oldIndex = index;
int pos = 1;
for (int key = 36; true; key += 36) {
int hex = (int) encoded.charAt(indexe++);
int digit = (hex - 48 < 10) ? hex - 22
: ((hex - 65 < 26) ? hex - 65
: ((hex - 97 < 26) ? hex - 97
: 36));
index += digit * pos;
int tag = (key <= base) ? 1 : ((key >= base + 26) ? 26 : (key - base));
if (digit < tag) {
break;
}
pos = (int) (pos * (36 - tag));
}
int delta = (int) (init ? ((index - oldIndex) / 700) : ((index - oldIndex) / 2));
delta += (int) (delta / (lengthd + 1));
int key;
for (key = 0; delta > 910; key += 36) {
delta = (int) (delta / 35);
}
base = (int) (key + 36 * delta / (delta + 38));
init = false;
ch += (int) (index / (lengthd + 1));
index %= (lengthd + 1);
if (lengthd > 0) {
for (int i = lengthd; i > index; i--) {
decoded.set(i, decoded.get(i - 1));
}
}
decoded.set(index++, ch);
}
// convert decoded ucs4 to utf8 string
StringBuilder sb = new StringBuilder();
for (int i = 0; i < decoded.size(); i++) {
int value = decoded.get(i);
if (value < 128) {
sb.append((char) value);
} else if (value < (1 << 11)) {
sb.append((char) (192 + (value >> 6)));
sb.append((char) (128 + (value & 63)));
} else if (value < (1 << 16)) {
sb.append((char) (224 + (value >> 12)));
sb.append((char) (128 + ((value >> 6) & 63)));
sb.append((char) (128 + (value & 63)));
} else if (value < (1 << 21)) {
sb.append((char) (240 + (value >> 18)));
sb.append((char) (128 + ((value >> 12) & 63)));
sb.append((char) (128 + ((value >> 6) & 63)));
sb.append((char) (128 + (value & 63)));
} else {
addMessage("hostname.CannotDecodePunycode");
throw new ValidatorException(messages);
}
}
return sb.toString();
}
/**
* Eliminates empty values from input array
* @param data
* @return
*/
private String[] verifyArray(String[] data) {
List<String> result = new ArrayList<String>();
for (String s : data) {
if (!s.equals("")) {
result.add(s);
}
}
return result.toArray(new String[result.size()]);
}
}
以及带有不同 tld 的正则表达式模式的 validIDNs.xml（太大而无法包含：）
<idnlist>
<idn>
<tld>AC</tld>
<pattern>^[\u002d0-9a-zà-öø-ÿāăąćĉċčďđēėęěĝġģĥħīįĵķĺļľŀłńņňŋőœŕŗřśŝşšţťŧūŭůűųŵŷźżž]{1,63}$</pattern>
</idn>
<idn>
<tld>AR</tld>
<pattern>^[\u002d0-9a-zà-ãç-êìíñ-õü]{1,63}$</pattern>
</idn>
<idn>
<tld>AS</tld>
<pattern>/^[\u002d0-9a-zà-öø-ÿāăąćĉċčďđēĕėęěĝğġģĥħĩīĭįıĵķĸĺļľłńņňŋōŏőœŕŗřśŝşšţťŧũūŭůűųŵŷźż]{1,63}$</pattern>
</idn>
<idn>
<tld>AT</tld>
<pattern>/^[\u002d0-9a-zà-öø-ÿœšž]{1,63}$</pattern>
</idn>
<idn>
<tld>BIZ</tld>
<pattern>^[\u002d0-9a-zäåæéöøü]{1,63}$</pattern>
<pattern>^[\u002d0-9a-záéíñóúü]{1,63}$</pattern>
<pattern>^[\u002d0-9a-záéíóöúüőű]{1,63}$</pattern>
</id>
</idlist>
于 2011-07-12T23:57:00.163 回答
3
public class Validations {
private Pattern regexPattern;
private Matcher regMatcher;
public String validateEmailAddress(String emailAddress) {
regexPattern = Pattern.compile("^[(a-zA-Z-0-9-\\_\\+\\.)]+@[(a-z-A-z)]+\\.[(a-zA-z)]{2,3}$");
regMatcher = regexPattern.matcher(emailAddress);
if(regMatcher.matches()) {
return "Valid Email Address";
} else {
return "Invalid Email Address";
}
}
public String validateMobileNumber(String mobileNumber) {
regexPattern = Pattern.compile("^\\+[0-9]{2,3}+-[0-9]{10}$");
regMatcher = regexPattern.matcher(mobileNumber);
if(regMatcher.matches()) {
return "Valid Mobile Number";
} else {
return "Invalid Mobile Number";
}
}
public static void main(String[] args) {
String emailAddress = "suryaprakash.pisay@gmail.com";
String mobileNumber = "+91-9986571622";
Validations validations = new Validations();
System.out.println(validations.validateEmailAddress(emailAddress));
System.out.println(validations.validateMobileNumber(mobileNumber));
}
}
于 2013-07-05T06:47:27.880 回答
2
如果您正在寻找验证电子邮件地址是否有效，那么VRFY将为您提供一些帮助。我发现它对于验证Intranet地址（即内部站点的电子邮件地址）很有用。但是它对 Internet 邮件服务器的用处不大（请参阅本页顶部的警告）
于 2009-03-09T10:16:56.517 回答
2
尽管 Apache commons 有许多替代方案，但它们的实现充其量只是基本的（就像Apache commons 的实现本身），在其他情况下甚至是完全错误的。
我也会远离所谓的简单“非限制性”正则表达式；没有这样的事情。例如@ 被允许多次取决于上下文，你怎么知道需要的那个？简单的正则表达式不会理解它，即使电子邮件应该是有效的。任何更复杂的东西都容易出错，甚至包含隐藏的性能杀手。你将如何维护这样的东西？
我知道的唯一全面的 RFC 兼容的基于正则表达式的验证器是email-rfc2822-validator，它的“精炼”正则表达式适当地命名为Dragons.java。虽然它只支持较旧的RFC-2822规范，但足以满足现代需求（RFC-5322在已经超出日常用例范围的领域对其进行了更新）。
但您真正想要的是一个能够正确解析字符串并根据 RFC 语法将其分解为组件结构的词法分析器。EmailValidator4J在这方面看起来很有希望，但仍然年轻且有限。
另一个选择是使用 Web 服务，例如 Mailgun 久经考验的验证 Web服务或Mailboxlayer API（刚刚获得了第一个 Google 结果）。它并不严格符合 RFC，但足以满足现代需求。
于 2017-12-29T09:43:23.880 回答
1
你想验证什么？电子邮件地址？
只能检查电子邮件地址的格式一致性。请参阅标准：RFC2822。最好的方法是使用正则表达式。如果不发送电子邮件，您永远不会知道是否真的存在。
我检查了公共验证器。它包含一个 org.apache.commons.validator.EmailValidator 类。似乎是一个很好的起点。
于 2009-03-09T01:09:41.650 回答
1
当前的 Apache Commons Validator 版本是1.3.1。
验证的类是 org.apache.commons.validator.EmailValidator。它有一个 org.apache.oro.text.perl.Perl5Util 的导入，它来自一个退休的Jakarta ORO 项目。
顺便说一句，我发现有一个 1.4 版本，这里是 API 文档。网站上写着：“上次发布时间：2008 年 3 月 5 日 | 版本：1.4-SNAPSHOT”，但这不是最终版本。构建自己的唯一方法（但这是一个快照，而不是 RELEASE）和使用，或从这里下载。这意味着 1.4 已经三年（2008-2011）没有定稿。这不是 Apache 的风格。我正在寻找一个更好的选择，但没有找到一个非常受欢迎的选择。我想使用经过良好测试的东西，不想遇到任何错误。
于 2011-04-03T17:55:31.683 回答
0
您可能还想检查长度 - 电子邮件最长为 254 个字符。我使用 apache commons 验证器，它不检查这个。
于 2010-11-09T15:39:54.903 回答
-2
似乎没有任何完美的库或方法可以自己执行此操作，除非您必须有时间向电子邮件地址发送电子邮件并等待回复（尽管这可能不是一个选项）。我最终使用了来自这里的建议 http://blog.logichigh.com/2010/09/02/validating-an-e-mail-address/ 并调整了代码以便它可以在 Java 中工作。
public static boolean isValidEmailAddress(String email) {
boolean stricterFilter = true;
String stricterFilterString = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
String laxString = ".+@.+\\.[A-Za-z]{2}[A-Za-z]*";
String emailRegex = stricterFilter ? stricterFilterString : laxString;
java.util.regex.Pattern p = java.util.regex.Pattern.compile(emailRegex);
java.util.regex.Matcher m = p.matcher(email);
return m.matches();
}
于 2013-09-30T22:03:41.487 回答
-2
这是最好的方法：
public static boolean isValidEmail(String enteredEmail){
String EMAIL_REGIX = "^[\\\\w!#$%&’*+/=?`{|}~^-]+(?:\\\\.[\\\\w!#$%&’*+/=?`{|}~^-]+)*@(?:[a-zA-Z0-9-]+\\\\.)+[a-zA-Z]{2,6}$";
Pattern pattern = Pattern.compile(EMAIL_REGIX);
Matcher matcher = pattern.matcher(enteredEmail);
return ((!enteredEmail.isEmpty()) && (enteredEmail!=null) && (matcher.matches()));
}
资料来源：- http://howtodoinjava.com/2014/11/11/java-regex-validate-email-address/
于 2015-10-15T13:08:05.910 回答
-2
另一种选择是使用Hibernate 电子邮件验证器，使用注释@Email或以编程方式使用验证器类，例如：
import org.hibernate.validator.internal.constraintvalidators.hv.EmailValidator;
class Validator {
// code
private boolean isValidEmail(String email) {
EmailValidator emailValidator = new EmailValidator();
return emailValidator.isValid(email, null);
}
}
于 2017-12-18T19:48:20.193 回答
-3
这是我的务实方法，我只需要使用 RFC 中允许的字符来合理区分 blah@domain 地址。地址必须预先转换为小写。
public class EmailAddressValidator {
private static final String domainChars = "a-z0-9\\-";
private static final String atomChars = "a-z0-9\\Q!#$%&'*+-/=?^_`{|}~\\E";
private static final String emailRegex = "^" + dot(atomChars) + "@" + dot(domainChars) + "$";
private static final Pattern emailPattern = Pattern.compile(emailRegex);
private static String dot(String chars) {
return "[" + chars + "]+(?:\\.[" + chars + "]+)*";
}
public static boolean isValidEmailAddress(String address) {
return address != null && emailPattern.matcher(address).matches();
}
}
于 2016-01-20T03:11:07.873 回答