Spring3中的mvc:interceptors标签配置拦截器

最新推荐文章于 2024-03-12 18:00:32 发布

Richard_J

最新推荐文章于 2024-03-12 18:00:32 发布

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本文介绍如何在 Spring MVC 中配置全局及特定 URL 的拦截器，通过 XML 文件进行设置，实现对请求的预处理逻辑，如权限验证等。

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这个是在webmvc-config.xml文件中配置的

mvc:interceptors

这个标签用于注册一个自定义拦截器或者是WebRequestInterceptors.

可以通过定义URL来进行路径请求拦截，可以做到较为细粒度的拦截控制。

例如在配置文件加入

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:mvc="http://www.springframework.org/schema/mvc"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="

http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

http://www.springframework.org/schema/mvc

http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

<mvc:interceptors>

</mvc:interceptors>

<mvc:interceptors>

<mvc:interceptor>

<mvc:mapping path="/secure/*"/>

</mvc:interceptor>

<mvc:interceptor>

<mvc:mapping path="/admin/*.do"/>

</mvc:interceptor>

</mvc:interceptors>

</beans>

定义的拦截器只需要实现

@Override

public boolean preHandle(HttpServletRequest req,HttpServletResponse res, Object handler)

package org.unism.qms.interceptor;
import java.io.PrintWriter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Repository;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
@Repository 
public class LoginIntercepter extends HandlerInterceptorAdapter{
 @SuppressWarnings({"rawtypes", "unchecked" })
 @Override  
    public boolean preHandle(HttpServletRequest request,  
            HttpServletResponse response, Object handler) throws Exception {  
  
        request.setCharacterEncoding("UTF-8");  
        response.setCharacterEncoding("UTF-8");  
        response.setContentType("text/html;charset=UTF-8");  
  
        String uri = request.getRequestURI();  
       //设置不拦截的对象
        String[] noFilters = new String[] { "tologin", "common", "js",  
                "images", "css", "/qualityFollowing/login", "/user/loadDepartment", 
                "/user/loadName", "/imageCheck"};  
        boolean beFilter = true; 
        for (String s : noFilters) {  
            if (uri.indexOf(s) != -1) {  
                beFilter = false;  
                break;  
            }  
        }
        if (beFilter == true) {  
             Object obj = request.getSession().getAttribute("user");  
             // 未登录  
             if (null == obj) {  
                 PrintWriter out = response.getWriter();  
                 StringBuilder builder = new StringBuilder();  
                 builder.append("<script type=\"text/javascript\" charset=\"UTF-8\">");  
                 builder.append("alert(\"本系统需要您登录后才能使用\");");  
                 builder.append("window.top.location.href=\"");  
                 builder.append(request.getContextPath());  
                    builder.append("/user/tologin\";</script>");  
                    out.print(builder.toString());  
                    out.close();  
                    return false;  
                }   
        }   
        return super.preHandle(request, response, handler);     
 }
}