href怎么请求到Servlet

Question

<TABLE cellSpacing=0 cellPadding=0 width=170 border=0 style="font-size:13px;">
        
        <TR height=22>
          <TD style="PADDING-LEFT: 30px" background=images/menu_bt.jpg><A 
            class=menuParent onclick=expand(1) 
            href="javascript:void(0);">基础设施资源</A></TD></TR>
        <TR height=4>
          <TD></TD></TR></TABLE>
      <TABLE id=child1 style="DISPLAY: none" cellSpacing=0 cellPadding=0 
      width=170 border=0 style="font-size:13px;">
        <TR height=20>
          <TD align=middle width=30><IMG height=9 
            src="images/menu_icon.gif" width=9></TD>
          <TD><A class=menuChild 
            href="./home.jsp?flag=2&str=IBM小型机" 
            target="midbody">IBM小型机</A></TD></TR>            //下面是一大堆子菜单 不贴了        </TABLE>主要是想在 子菜单 比如IBM小型机的菜单上加上一个点击传参数的作用 用来调用后台数据库 在页面上返回结果集 href该怎么写？
下面是servlet：
<servlet>
    <servlet-name>DeviceServlet</servlet-name>
    <servlet-class>com.git.servlet.DeviceServlet</servlet-class>
  </servlet>
  
  <servlet-mapping>
    <servlet-name>DeviceServlet</servlet-name>
    <url-pattern>/DeviceServlet</url-pattern>
  </servlet-mapping>

Answer 1

<a href="/DeviceServlet"></a>

Answer 2

<a href="./DeviceServlet"></a>
用 <a> 来访问Servlet，这属于 GET 操作，在servlet中将操作定义在doGet中。

Answer 3

例子：
java servlet部分代码
public class FinServlet extends HttpServlet {
    public void doGet(HttpServletRequest req, HttpServletResponse res)
        throws IOException,ServletException{
        doPost(req, res); 
     }
    public void doPost(HttpServletRequest req, HttpServletResponse res)
        throws IOException,ServletException{
        User user = new User();
        user.setUsername(req.getParameter("username"));
        UserDAO dao=new UserDAOImpl();
        int flag = 0;
        try{
            flag=dao.fin(user);
        }
        catch(Exception e){
            e.printStackTrace();
        }
    
    if(flag==1){
        HttpSession session=req.getSession();
        session.setAttribute("username", user.getUsername());
        session.setAttribute("name", user.getName());
        session.setAttribute("email", user.getEmail());
        session.setAttribute("sex", user.getSex());
        session.setAttribute("school", user.getSchool());
        session.setAttribute("tel", user.getTel());
        session.setAttribute("Date_Year", user.getDate_Year());
        session.setAttribute("birthday_m", user.getBirthday_m());
        session.setAttribute("birthday_d", user.getBirthday_d());
        res.sendRedirect("./fpi.jsp");
        
    }
    else {
        res.sendRedirect("./pi.jsp");
    }
}
}jsp调用代码
<a href="/fin?username=<%=(String)session.getAttribute("username")%>" method="post">Information</a>

Answer 4

但是这样写老是报错404  我怀疑是servlet和struts请求冲突了。。
Could not find action or result
There is no Action mapped for namespace / and action name DeviceServlet. - [unknown location]
at com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:177)
at org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:61)
at org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
at com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:47)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:458)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:619)