servlet和springmvc用户鉴权_springmvc 鉴权

servlet

创建filter文件：

package com.filter;
 
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.HttpServletResponse;
import javax.servlet.http.HttpSession;
 
/**
 * Servlet Filter implementation class login
 */
 
public class login_filter implements Filter {
 
    /**
     * Default constructor. 
     */
    public login_filter() {
        // TODO Auto-generated constructor stub
    }
 
	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}
 
	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	String passUrl = "";
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
			
	HttpServletRequest httpRequest=(HttpServletRequest)request;
        HttpServletResponse httpResponse=(HttpServletResponse)response;
        String[] strArray = passUrl.split(";");
        for (String str : strArray) {
            if (str.equals(""))
                continue;
            if (httpRequest.getRequestURL().indexOf(str) >= 0) {
                chain.doFilter(request, response);
                return;
            }
        }
        HttpSession session=httpRequest.getSession();
        if(session.getAttribute("username")!=null){
            chain.doFilter(request, response);
        }
        else{
            httpResponse.sendRedirect(httpRequest.getContextPath()+"/login.jsp");
        }
	}
 
	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
		passUrl = fConfig.getInitParameter("passUrl");
	}
 
}

配置xml文件

<filter>
  	<filter-name>login_filter</filter-name>
  	<display-name>login_filter</display-name>
  	<description></description>
  	<filter-class>com.filter.login_filter</filter-class>
  	<init-param>
        <param-name>passUrl</param-name>
        <param-value>login.jsp;register.jsp;login;register;</param-value>  //无需filter的文件
    </init-param>
  </filter>
  <filter-mapping>
  	<filter-name>login_filter</filter-name>
  	<url-pattern>/*</url-pattern>
  </filter-mapping>

重启之后，除了login和register文件，其他都需要登录才能访问

springmvc

创建class文件

package com.springmvc.fastdfs;
 
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpServletResponse;  
import javax.servlet.http.HttpSession;   
import org.springframework.web.servlet.ModelAndView;  
 
public class SecurityInterceptor implements HandlerInterceptor{
	 
	  
     
    public boolean preHandle(HttpServletRequest req, HttpServletResponse res, Object handler) throws Exception {  
        HttpSession session = req.getSession(true);         
        Object obj = session.getAttribute("username");         
        if (obj == null || "".equals(obj.toString())) {  
            res.sendRedirect("login");  
        }  
        return true;  
    }  
  
    
    public void postHandle(HttpServletRequest req, HttpServletResponse res, Object arg2, ModelAndView arg3) throws Exception {  
    }  
  
     
    public void afterCompletion(HttpServletRequest req, HttpServletResponse res, Object arg2, Exception arg3) throws Exception {  
    }  
 
}

修改springmvc.xml文件

<mvc:annotation-driven /> 
        <mvc:interceptors>  
        <mvc:interceptor>  
            <!-- 需拦截的地址 -->                          
            <mvc:mapping path="/**" />                       
            <!-- 需排除拦截的地址 -->  
            <mvc:exclude-mapping path="/login"/>
            <mvc:exclude-mapping path="/logindo"/>  
            <mvc:exclude-mapping path="/register"/>
            <mvc:exclude-mapping path="/registerdo"/>
             
             
            <bean class="com.springmvc.fastdfs.SecurityInterceptor" />  
        </mvc:interceptor>  
    	</mvc:interceptors>  

重启之后可以进行拦截