javaweb中遇到的问题

1.通过超链接调用Servlet：
mainPage.jsp:<a href="QueryAllServlet"> 员工管理 </a>
Web.xml配置：
<servlet>
<servlet-name>mainPage</servlet-name>
<servlet-
class>com.tydic.servlet.QueryAllServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>mainPage</servlet-name>
<url-pattern>/QueryAllServlet</url-pattern>
</servlet-mapping>
2. 怎样在servlet中判断前台的jsp页面中哪个按钮被按下?
<form action="yourservletname" method=post>;
<input type=submit name=submitbutton value=button1>;
<input type=submit name=submitbutton value=button2>;
<input type=submit name=submitbutton value=button3>;
</form>;
servlet为
...........doPost(........)
{
String value=(String)request.getParameter("submitbutton"; if(value="button1"
{................}
else if(value="button2"
{................}
else
{.................}
3. 实现将多个按钮发送到不同的网页中
<Script Language="JavaScript">
function mod() {
document.form1.action = "1.jsp";
document.form1.submit();
}
function del() {
document.form1.action = "2.jsp";
document.form1.submit();
}
</Script>
<form name="form1"action="">
<INPUT Type="Button"Name="Modify"Value="修改" onClick="mod()">
<INPUT Type="Button"Name="Delete"Value="删除" onClick="del()">
</form>
4. 实现将多个按钮调用不同的servlet
Web.xml中：
<servlet>
<servlet-name>s3</servlet-name>
<servlet-class>S3</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>s3</servlet-name>
<url-pattern>/S3</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>s1</servlet-name>
<servlet-class>S1</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>s1</servlet-name>
<url-pattern>/S1</url-pattern>
</servlet-mapping>
Jsp：
<Script Language="JavaScript">
function del() {
document.form1.action = "S3";
document.form1.submit();
}
function mod() {
document.form1.action = "S1";
document.form1.submit();
}
</Script>
<form name="form1"action="">
<INPUT Type="Button"Name="Delete"Value="删除" onClick="del()">
<INPUT Type="Button"Name="Modify"Value="修改" onClick="mod()">
</form>。