📄 csdn_struts原理与应用（三）.htm
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else {
user = getUser(database, username);
if ((user != null) && !user.getPassword().equals(password))
user = null;
if (user == null)
errors.add(ActionErrors.GLOBAL_ERROR,
new ActionError("error.password.mismatch"));
}
// Report any errors we have discovered back to the original form
if (!errors.isEmpty()) {
saveErrors(request, errors);
return (mapping.getInputForward());
}
// Save our logged-in user in the session
HttpSession session = request.getSession();
session.setAttribute(Constants.USER_KEY, user);
if (log.isDebugEnabled()) {
log.debug("LogonAction: User '" + user.getUsername() +
"' logged on in session " + session.getId());
}
// Remove the obsolete form bean
if (mapping.getAttribute() != null) {
if ("request".equals(mapping.getScope()))
request.removeAttribute(mapping.getAttribute());
else
session.removeAttribute(mapping.getAttribute());
}
// Forward control to the specified success URI
return (mapping.findForward("success"));
}
/**
* Look up the user, throwing an exception to simulate business logic
* rule exceptions.
*
* @param database Database in which to look up the user
* @param username Username specified on the logon form
*
* @exception ModuleException if a business logic rule is violated
*/
public User getUser(UserDatabase database, String username)
throws ModuleException {
// Force an ArithmeticException which can be handled explicitly
if ("arithmetic".equals(username)) {
throw new ArithmeticException();
}
// Force an application-specific exception which can be handled
if ("expired".equals(username)) {
throw new ExpiredPasswordException(username);
}
// Look up and return the specified user
return ((User) database.findUser(username));
}
}
</TEXTAREA> </P><A
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<TR></TD></TR></TBODY></TABLE><BR><!--文章评论开始//-->
<TABLE cellSpacing=0 cellPadding=0 width=770 align=center bgColor=#006699
border=0>
<TBODY>
<TR bgColor=#006699>
<TD id=white align=middle bgColor=#006699><FONT
color=#ffffff>对该文的评论</FONT></TD>
<TD align=middle><!--文章人气开始//-->
<SCRIPT src="CSDN_Struts原理与应用（三）.files/readnum.htm"></SCRIPT>
<!--文章人气开始//--></TD></TR></TBODY></TABLE>
<TABLE cellSpacing=1 cellPadding=2 width=770 align=center bgColor=#666666
border=0>
<TBODY>
<TR>
<TD bgColor=#cccccc colSpan=3><SPAN style="COLOR: #990000"><IMG height=16
hspace=1 src="CSDN_Struts原理与应用（三）.files/ico_pencil.gif" width=16>
</SPAN> Mai_520<I>(2003-12-17 17:36:01)</I> </TD></TR>
<TR>
<TD width=532 bgColor=#ffffff
colSpan=3><BR>action只是把大量的业务逻辑进行整合的地方，并不进行具体的业务逻辑操作<BR></TD></TR></TBODY></TABLE>
<TABLE cellSpacing=1 cellPadding=2 width=770 align=center bgColor=#666666
border=0>
<TBODY>
<TR>
<TD bgColor=#cccccc colSpan=3><SPAN style="COLOR: #990000"><IMG height=16
hspace=1 src="CSDN_Struts原理与应用（三）.files/ico_pencil.gif" width=16>
</SPAN> icecloud<I>(2003-12-16 13:06:18)</I>
</TD></TR>
<TR>
<TD width=532 bgColor=#ffffff colSpan=3><BR>to
guanshengyong<BR>这是一个设计问题，action只处理request并调用facade层，不应该包含具体逻辑。<BR>比如处理登陆，不能在这里访问数据库，并判断是否存在某用户，而应该是把这段封装在一个facade的validateUser方法中。
<BR><BR>大概就是这样<BR></TD></TR></TBODY></TABLE>
<TABLE cellSpacing=1 cellPadding=2 width=770 align=center bgColor=#666666
border=0>
<TBODY>
<TR>
<TD bgColor=#cccccc colSpan=3><SPAN style="COLOR: #990000"><IMG height=16
hspace=1 src="CSDN_Struts原理与应用（三）.files/ico_pencil.gif" width=16>
</SPAN> guanshengyong<I>(2003-12-15 22:51:55)</I>
</TD></TR>
<TR>
<TD width=532 bgColor=#ffffff
colSpan=3><BR>不把大量的业务逻辑写在了action中,应该写在什么地方?不太懂<BR></TD></TR></TBODY></TABLE>
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