為了實現用戶登錄攔截你是否寫過如下代碼呢?
1. 基于Filter
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import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpSession;public class AuthenticationFilter implements Filter { private FilterConfig filterConfig; private String onErrorUrl; public void init(FilterConfig filterConfig) throws ServletException { // 從 filterConfig 中的得到錯誤頁 this.filterConfig = filterConfig; this.onErrorUrl = filterConfig.getInitParameter("onError"); if(this.onErrorUrl == null || "".equals(this.onErrorUrl)) this.onErrorUrl = "onError"; } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest httpRequest = (HttpServletRequest)request; session = httpRequest.getSession(); if(null == session.getAttribute("_LOGIN_USER_") && !"/login".equals(httpRequest.getServletPath())) { httpRequest.getRequestDispatcher("/"+this.onErrorUrl).forward(request, response); }else{ chain.doFilter(request, response); } } public void destroy() { }} |
2. 基于Struts
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import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionInvocation;import com.opensymphony.xwork2.interceptor.AbstractInterceptor;@SuppressWarnings("serial")public class LoginInterceptor extends AbstractInterceptor { @Override public String intercept(ActionInvocation invocation) throws Exception { String currentUser="currentUser"; HttpServletRequest request=ServletActionContext.getRequest(); HttpServletResponse response=ServletActionContext.getResponse(); HttpSession session=request.getSession(); if(request.getRequestURI().endsWith("login.action")){ return invocation.invoke(); } else { if(session.getAttribute(currentUser)!=null){ return invocation.invoke(); }else{ response.sendRedirect(request.getContextPath()+"/login.jsp"); } } return null; }} |
3. 基于SpringMVC
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import javax.servlet.RequestDispatcher;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import cn.edu.hdc.util.Constants;/** * @ClassName: LoginInterceptor * @Description: 登錄攔截器 * @author loweir [email protected] * @date 2016年4月27日 上午8:06:11 */public class LoginInterceptor implements HandlerInterceptor { /** * 在目標方法前被調用，返回 true 繼續 */ @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object obj) throws Exception { try { String url = request.getRequestURI(); // 如果不是登錄操作 判斷 session if (!url.endsWith("login")) { if (request.getSession().getAttribute(Constants.CURRENT_USER) == null) { response.sendRedirect(request.getContextPath() + "/login.jsp"); return false; } } } return true; } catch (Exception e) { e.printStackTrace(); return false; } } @Override public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3) throws Exception { } @Override public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3) throws Exception { }} |
如何使用自定義注解完成自定義攔截呢？
登錄注解
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import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;/** * Created by loweir on 2017/5/14 17:19 * <p> * author: 張瑀楠 * email: [email protected] * 負責登錄攔截 */@Retention(RetentionPolicy.RUNTIME)@Target({ElementType.TYPE,ElementType.METHOD})public @interface WebLoginRequired { String value() default ""; // 未登錄時需要跳轉的路徑} |
SpringMVC 攔截器設置
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import com.ainsoft.globalshoperp.component.constant.WebLogin;import org.apache.commons.lang3.StringUtils;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.springframework.web.method.HandlerMethod;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Created by loweir on 2017/5/14 17:14 * <p> * author: 張瑀楠 * email: [email protected] */public class LoginInterceptor implements HandlerInterceptor { private static Log logger = LogFactory.getLog(LoginInterceptor.class); public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object handler) throws Exception { if (logger.isDebugEnabled()) { logger.debug("攔截器啟動"); } /* * 判斷是否為 HandlerMethod.class * 如果不是說明當前請求并不是 SpringMVC 管理， * 如果不是再自行根據業務做響應操作，這里直接返回 true */ if (HandlerMethod.class.isInstance(handler)) { HandlerMethod handlerMethod = (HandlerMethod) handler; // 判斷該 handler 是否有WebLoginRequired注解 WebLoginRequired webLoginRequired = handlerMethod.getMethod().getDeclaredAnnotation(WebLoginRequired.class); // 如果該 handler 沒有WebLoginRequired注解，判斷所屬Controller 是否包含注解 if (null == webLoginRequired) { webLoginRequired = handlerMethod.getBeanType().getAnnotation(WebLoginRequired.class); } // 如果需要 WebLoginRequired 判斷 session if (null != webLoginRequired) { if (httpServletRequest.getSession().getAttribute(WebLogin.CURRENTUSER) == null) { String executeURL = webLoginRequired.value(); if (StringUtils.isBlank(executeURL)) { executeURL = WebLogin.LOGIN; } httpServletResponse.sendRedirect(httpServletRequest.getContextPath() + executeURL); return false; } } } return true; } public void postHandle(javax.servlet.http.HttpServletRequest httpServletRequest, javax.servlet.http.HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception { if (logger.isDebugEnabled()) { logger.debug("postHandler"); } } public void afterCompletion(javax.servlet.http.HttpServletRequest httpServletRequest, javax.servlet.http.HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception { if (logger.isDebugEnabled()) { logger.debug("afterCompletion"); } }} |
最終 controller 寫法
1. 不需要登錄權限的
類和方法都不需要注解
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@Controller@RequestMapping("auth")public class AuthController { @RequestMapping("login") public String login() { return "login"; }} |
2. 整個 controller 內都需要登錄權限
在類上添加注解即可
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@Controller@WebLoginRequired@RequestMapping("order")public class OrderController { @RequestMapping("index") public String index() { return "index"; }} |
3. controller 某個方法需要登錄權限
只在需要登錄權限的方法上添加注解
在注解上可以指定需要重定向的鏈接
如果不指定則默認到 login
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@Controller@RequestMapping("order")public class OrderController { @RequestMapping("index") public String index() { return "index"; } // 需要登錄 @WebLoginRequired @RequestMapping("add") public String index() { return "index"; } // 需要登錄,如果未登錄跳到 error @WebLoginRequired("error") @RequestMapping("delete") public String index() { return "index"; }} |
以上就是SpringMVC 如何使用注解完成登錄攔截的詳細內容，更多關于SpringMVC 使用注解完成登錄攔截的資料請關注服務器之家其它相關文章！
原文鏈接：https://www.cnblogs.com/zyndev/p/7613006.html
