@WebFilter("/*") public class LoginFilter implements Filter { @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest req = (HttpServletRequest) request; HttpSession session = req.getSession(); Object user = session.getAttribute("userName"); System.out.println(user); if (user != null) { System.out.println("!!!"); chain.doFilter(request, response); } else { String[] urls = { "login.html", "t/login.html", "imgs/", "css/", "js/", "element-ui/", "user/login", "user/checkCode"}; String url = req.getRequestURL().toString(); for (String u : urls) { if (url.contains(u)) { System.out.println(url); chain.doFilter(request, response); //break; return; } } HttpServletResponse resp = (HttpServletResponse) response; resp.sendRedirect("/login.html?1");
时间: 2023-06-26 16:07:57 浏览: 45
这段代码是一个过滤器,用于拦截所有请求并检查用户是否已经登录。如果用户已经登录,就会继续处理请求;否则,会重定向到登录页面。过滤器的实现方式是实现 Filter 接口并在 doFilter 方法中编写拦截逻辑。在这个例子中,过滤器会检查 HttpSession 中是否存在 userName 属性,如果存在,就表示用户已经登录。如果不存在,就会检查请求的 URL 是否需要被放行(如静态资源或登录页面本身),如果需要被放行,就会调用 FilterChain 的 doFilter 方法将请求传递给下一个过滤器或 Servlet 处理;否则,就会重定向到登录页面。
相关问题
/** * 检查用户是否已经完成登录 */ @WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*") @Slf4j public class LoginCheckFilter implements Filter{ //路径匹配器,支持通配符 public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher(); @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) servletRequest; HttpServletResponse response = (HttpServletResponse) servletResponse;
这段代码是一个基于Servlet的过滤器,用于检查用户是否已经完成登录。具体实现方式是在过滤器中获取HttpServletRequest对象,通过该对象判断用户是否已经完成登录,如果未完成登录则重定向到登录页面。该过滤器使用@WebFilter注解标注,指定了过滤器名称和匹配的URL模式。在doFilter方法中,首先将ServletRequest对象转换为HttpServletRequest对象和ServletResponse对象转换为HttpServletResponse对象。然后通过HttpServletRequest对象获取用户登录状态,如果未完成登录则重定向到登录页面,否则继续执行请求。该过滤器使用了AntPathMatcher路径匹配器,支持通配符,可以对不同的URL进行过滤。
package com.xy.filter; import com.xy.http.HttpContent; import javax.servlet.*; import javax.servlet.annotation.WebFilter; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; /** * @author chengzhao */ //拦截请求 @WebFilter(urlPatterns = "/*") public class XssFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { HttpServletRequest request= (HttpServletRequest) servletRequest; //先进行转义在把请求返回 XssHttpServletRequestWrapper wrapper=new XssHttpServletRequestWrapper(request); filterChain.doFilter(wrapper,servletResponse); } @Override public void destroy() { } }如何在这个类中加入错误code和提示?
您可以在doFilter方法中进行错误处理。例如,您可以检查请求是否包含恶意代码,并根据情况设置错误代码和错误消息。如果检测到恶意代码,您可以使用HttpServletResponse对象设置错误代码和错误消息。下面是一个示例代码片段:
```
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest request= (HttpServletRequest) servletRequest;
//先进行转义在把请求返回
XssHttpServletRequestWrapper wrapper=new XssHttpServletRequestWrapper(request);
//检查请求是否包含恶意代码
if(isMaliciousRequest(wrapper)) {
HttpServletResponse response = (HttpServletResponse) servletResponse;
response.sendError(HttpServletResponse.SC_BAD_REQUEST, "请求包含恶意代码");
} else {
filterChain.doFilter(wrapper,servletResponse);
}
}
```
在这个示例中,如果检测到恶意代码,将设置代码为400(SC_BAD_REQUEST)的错误消息。您可以将错误代码和错误消息更改为适合您的应用程序的值。