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Question

attachment是什么？？你这样的方式是请求一个Servlet

Answer 1

这是javamail自带例子里的，这段代码是查看附件用的，他有一个taglib.tld文件，attachment是从<javamail:listattachments
 id="attachment"
 messageinfo="msginfo">产生的。taglib.tld文件是这样写的
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE taglib
        PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN"
        "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">
<taglib>
  <tlibversion>1.0</tlibversion>
  <jspversion>1.1</jspversion>
  <shortname>javamail</shortname>
  <uri>http://java.sun.com/products/javamail/demo/webapp</uri>
  <tag>
    <name>listattachments</name>
    <tagclass>demo.ListAttachmentsTag</tagclass>
    <teiclass>demo.ListAttachmentsTEI</teiclass>
    <bodycontent>JSP</bodycontent>
    <info>
        A listattachments tag
    </info>
    <attribute>
      <name>id</name>
      <required>true</required>
      <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
      <name>messageinfo</name>
      <required>true</required>
      <rtexprvalue>true</rtexprvalue>
    </attribute>
  </tag>
  <tag>
    <name>listmessages</name>
    <tagclass>demo.ListMessagesTag</tagclass>
    <teiclass>demo.ListMessagesTEI</teiclass>
    <bodycontent>JSP</bodycontent>
    <info>
        A listmessages tag
    </info>
    <attribute>
      <name>id</name>
      <required>true</required>
      <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
      <name>folder</name>
      <required>false</required>
      <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
      <name>session</name>
      <required>false</required>
      <rtexprvalue>true</rtexprvalue>
    </attribute>
  </tag>
  <tag>
    <name>message</name>
    <tagclass>demo.MessageTag</tagclass>
    <teiclass>demo.MessageTEI</teiclass>
    <bodycontent>empty</bodycontent>
    <info>
        A message tag
    </info>
    <attribute>
      <name>id</name>
      <required>true</required>
      <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
      <name>folder</name>
      <required>false</required>
      <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
      <name>session</name>
      <required>false</required>
      <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
      <name>num</name>
      <required>true</required>
      <rtexprvalue>true</rtexprvalue>
    </attribute>
  </tag>
  <tag>
    <name>sendmail</name>
    <tagclass>demo.SendTag</tagclass>
    <bodycontent>JSP</bodycontent>
    <info>
        An sendmail tag
    </info>
    <attribute>
      <name>host</name>
      <required>false</required>
      <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
      <name>recipients</name>
      <required>true</required>
      <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
      <name>sender</name>
      <required>true</required>
      <rtexprvalue>true</rtexprvalue>
    </attribute>
    <attribute>
      <name>subject</name>
      <required>false</required>
      <rtexprvalue>true</rtexprvalue>
    </attribute>
  </tag>
</taglib>