您好我正在为扫描邮件的应用程序开发电子邮件过滤器以确定它们是否是垃圾邮件，这是我的班级：
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import ca.etsmtl.logti.log619.lab05.utilities.EmailSplicer;
public class MotsClesFilter implements EmailFilter {
final String NAME = "Filtrage par mots cles";
private Pattern chaineSpam;
private Matcher chaineCourriel;
private int nbOccMotSpam =0;
private byte confidenceLevel;
@Override
public String getFilterName() {
return this.NAME;
}
@Override
public byte checkSpam(MimeMessage message) {
analyze(message);
switch(this.nbOccMotSpam){
case 0:
this.confidenceLevel = 1;
break;
case 1:
this.confidenceLevel = CANT_SAY;
break;
case 2:
this.confidenceLevel= 50;
break;
case 3:
this.confidenceLevel = 70;
break;
case 4 :
this.confidenceLevel = 80;
break;
} return (getConfidenceLevel());
}
public void analyze(MimeMessage message){
try {
List<String> listeChaines = new ArrayList<String>();
BufferedReader bis = new BufferedReader(new InputStreamReader(new FileInputStream(new File("SpamWords.txt"))));
while(bis.ready()){
String ligne = bis.readLine();
listeChaines.add(ligne);
}
String[] tabMots = EmailSplicer.getMessageContent(message);
for (int i =0;i<tabMots.length;i++){
/*System.out.print("*************************************");
System.out.print(tabMots[0]);
System.out.print("**************************************");*/
for (int j =0; j<listeChaines.size();j++){
this.chaineSpam = Pattern.compile(listeChaines.get(j));
this.chaineCourriel = this.chaineSpam.matcher(tabMots[i]);
if (this.chaineCourriel.matches())
this.nbOccMotSpam++;
}
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (MessagingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public byte getConfidenceLevel() {
// TODO Auto-generated method stub
return this.confidenceLevel;
}
@Override
public boolean enabled() {
// TODO Auto-generated method stub
return true;
}
}
这是我正在使用的EmailSplicer实用程序类：
import java.io.IOException;
import java.util.ArrayList;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.internet.MimeMessage;
/**
* Utility class to return all the content of a MimeMessage
* @author Maxime Caumartin <maxime.caumartin.1@ens.etsmtl.ca>
*/
public class EmailSplicer {
/**
* Contains the types of email parts that can be analyzed by this class.
* @author Maxime Caumartin <maxime.caumartin.1@ens.etsmtl.ca>
*/
private enum ContentTypes
{
Plain("text/plain"), HTML("text/html"), Multipart("multipart"), Unknown(
"?");
private String type;
ContentTypes(String type)
{
this.type = type;
}
public static ContentTypes getType(String type)
{
if (type.contains(Plain.type))
return Plain;
if (type.contains(HTML.type))
return HTML;
if (type.contains(Multipart.type))
return Multipart;
return Unknown;
}
}
/**
* Recursive method that passes through all the parts of the Mutlipart message and returns an ArrayList<String> of the content of these parts.
* @param multiPartMsg The Multipart that needs to be dissected.
* @return The ArrayList<String> containing all the content of the Mutlipart message.
* @throws MessagingException Exception thrown if the analyzer cannot read the message.
* @throws IOException Exception thrown if the encoding type isn't valid.
*/
private static ArrayList<String> getMutlipartContent(Multipart multiPartMsg)
throws MessagingException, IOException
{
ArrayList<String> returnTable = new ArrayList<String>(
multiPartMsg.getCount());
for (int i = 0; i < multiPartMsg.getCount(); i++)
{
switch (ContentTypes.getType(multiPartMsg.getBodyPart(i)
.getContentType()))
{
case Plain:
returnTable.add((String) multiPartMsg.getBodyPart(i)
.getContent());
break;
case HTML:
String s = org.clapper.util.html.HTMLUtil.textFromHTML((String) multiPartMsg.getBodyPart(i)
.getContent()).trim();
if (s.length() != 0)
returnTable.add(s);
break;
case Multipart:
returnTable
.addAll(getMutlipartContent((Multipart) multiPartMsg
.getBodyPart(i).getContent()));
break;
default:
}
}
return returnTable;
}
/**
* Returns all the content of the MimeMessage passed as a parameter. The whole content will be parsed.
* @param message The MimeMessage containing textual information.
* @return The array of string containing all the strings from the content of the message.
* @throws MessagingException Exception thrown if the analyzer cannot read the message.
* @throws IOException Exception thrown if the encoding type isn't valid.
*/
public static String[] getMessageContent(MimeMessage message)
throws MessagingException, IOException
{
String contentType = message.getContentType();
switch (ContentTypes.getType(contentType))
{
case Plain:
return new String[] { (String) message.getContent() };
case Multipart:
return getMutlipartContent(
(Multipart) message.getContent()).toArray(new String[0]);
case HTML:
String s = org.clapper.util.html.HTMLUtil.textFromHTML((String) message
.getContent()).trim();
if (s.length() != 0)
return new String[] {s};
default:
return new String[0];
}
}
}
现在，当我执行整个应用程序的main方法时，这是我得到的异常：
java.io.UnsupportedEncodingException: iso-0621-9
at sun.nio.cs.StreamDecoder.forInputStreamReader(Unknown Source)
at java.io.InputStreamReader.<init>(Unknown Source)
at com.sun.mail.handlers.text_plain.getContent(text_plain.java:82)
at javax.activation.DataSourceDataContentHandler.getContent(Unknown Source)
at javax.activation.DataHandler.getContent(Unknown Source)
at javax.mail.internet.MimeBodyPart.getContent(MimeBodyPart.java:629)
at ca.etsmtl.logti.log619.lab05.utilities.EmailSplicer.getMutlipartContent(EmailSplicer.java:69)
at ca.etsmtl.logti.log619.lab05.utilities.EmailSplicer.getMessageContent(EmailSplicer.java:101)
at ca.etsmtl.logti.log619.lab05.filter.MotsClesFilter.analyze(MotsClesFilter.java:66)
at ca.etsmtl.logti.log619.lab05.filter.MotsClesFilter.checkSpam(MotsClesFilter.java:34)
at ca.etsmtl.logti.log619.lab05.Application.main(Application.java:107)
有人可以告诉我如何解决它吗？
答案 0 :(得分：2)
This document列出了Java支持的编码。
iso-0621-9不在列表中。
答案 1 :(得分：2)
ISO-0621-9不是编码，如果它不是supported by Java的编码。我猜这甚至可能是垃圾邮件的一个很好的指标：没有有效的编码=＆gt;垃圾邮件。
ISO 621 的一点点Google搜索显示ISO-621是“锰矿石的国际标准 - 金属铁含量的测定（金属铁含量不超过2％） - 磺基水杨酸光度法“
我认为这与计算机关系不大，编码更少;）