Spring interceptor

• 如何使用
  • 定义一个连接器类，实现HandlerInterceptor接口
  • 重写3个方法
    • preHandle 访问方法前，决定是否放行
    • postHandle 方法执行后返回视图；可修改视图展示内容
    • afterCompletion 视图交给浏览器渲染后
  • 配置spring-mvc 配置文件 ```java

public class PrivilegeInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { /判断有没有登录，没有登录则跳转到登录页面，登录了则放行/ HttpSession session = request.getSession(); if(session.getAttribute(“User”)==null){ response.sendRedirect(request.getContextPath()+”/login.jsp”); return false; } //放行，访问目标资源 return true; }

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
}

```

• 其它知识
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