我目前有一个按钮可以重置我的点击计数器程序。我想要做的是，如果您将/counter/reset 键入您的 URL，它就会以相同的方式发挥作用。下面是我的 web.xml 和我的 Java 程序:
<servlet>
<servlet-name>Counter</servlet-name>
<servlet-class>Counter</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Counter</servlet-name>
<url-pattern>/counter/show</url-pattern>
<url-pattern>/counter/display</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
</web-app>
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Counter extends HttpServlet{
int counter = 0;
public void doGet(HttpServletRequest request, HttpServletResponse
response)throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
if(Boolean.valueOf(request.getParameter("reset"))) {
counter = 0;
response.sendRedirect(getServletContext().getContextPath() +
request.getServletPath());
} else {
counter++;
pw.println("<html><head/><body>");
pw.println("<span>Hit Counter:" + counter + "</span>");
pw.println("<a href=\"" +
getServletContext().getContextPath() +
request.getServletPath() +
"?reset=true" + "\">Reset</a>");
pw.println("</body></html>");
}
}
}
请您参考如下方法:
将您的 Counter.java 和 web.xml 替换为
计数器.java
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
公共(public)类计数器扩展 HttpServlet {
int counter = 0;
@Override
public void doGet(HttpServletRequest request, HttpServletResponse
response)throws ServletException, IOException
{
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
if(request.getServletPath().equals("/counter/reset"))
{
counter = 0;
response.sendRedirect(getServletContext().getContextPath()+"/counter/show");
} else
{
counter++;
pw.println("<html><head/><body>");
pw.println("<span>Hit Counter:" + counter + "</span>");
pw.println("<a href=\"" +
getServletContext().getContextPath() +
"/counter/reset" +
"\">Reset</a>");
pw.println("</body></html>");
}
}
web.xml--
<web-app>
<servlet>
<servlet-name>Counter</servlet-name>
<servlet-class>Counter</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Counter</servlet-name>
<url-pattern>/counter/show</url-pattern>
<url-pattern>/counter/display</url-pattern>
<url-pattern>/counter/reset</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
我认为，这就是您的查询的解决方案。
