退出功能
什么叫做登录了？session中有user对象。
实现步骤：
- 访问servlet，将session销毁
- 跳转到登录页面
登录成功
退出成功
代码实现：
<span id="span_username"></span>
<a href="myfavorite.html" class="collection">我的收藏</a>
<a href="javascript:location.href='exitServlet';">退出</a>
</div>
package cn.itcast.travel.web.servlet;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
@WebServlet("/exitServlet")
public class ExitServlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.销毁session
request.getSession().invalidate();
//2.跳转登录页面
response.sendRedirect(request.getContextPath()+"/login.html");
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}
BaseServlet抽取
优化Servlet
减少Servlet的数量，现在是一个功能一张Servlet，将其优化为一个模块一个Servlet，相当于在数据库中一张表对应一个Servlet，在Servlet中提供不同的方法，完成用户的请求
·
谁调用我？我代表谁
package cn.itcast.travel.web.servlet;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
@WebServlet("/user/*") ///user/add/user/find
public class UserServlet extends BaseServlet {
public void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("userServlet的add方法");
}
public void find(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("userServlet的find方法");
}
}
package cn.itcast.travel.web.servlet;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
@WebServlet("/category/*")
public class CategoryServlet extends BaseServlet {
public void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("CategoryServlet的add方法");
}
public void find(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("CategoryServlet的find方法");
}
}
package cn.itcast.travel.web.servlet;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
@WebServlet("/baseServlet")
public class BaseServlet extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
/*System.out.println("baseServletd servlice的方法被执行了......");*/
//完成方法分发
//1.获取请求路径
String uri = req.getRequestURI(); // /user/add
System.out.println("请求uri："+uri); // /user/add
//2.获取方法名称
String methodName = uri.substring(uri.lastIndexOf('/') + 1);
System.out.println("方法名称："+methodName);
//3.获取方法对象Method
//谁调用我？我代表谁
System.out.println(this);//UserServlet的对象 cn.itcast.travel.web.servlet.UserServlet@5e344e00
try {
//获取方法
Method method = this.getClass().getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
//4.执行方法
//暴力反射
method.invoke(this,req,resp);
} catch (NoSuchMethodException e) {
throw new RuntimeException(e);
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
}
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标签：BaseServlet,抽取,request,println,IOException,退出,import,servlet,javax From： https://www.cnblogs.com/x3449/p/17168131.html