SpringMVC學習3——配置全局的處理類

SpringMVC學習3——配置全局的處理類

全局異常處理

/**
 * 全局異常處理器
 * @author Steven
 *
 */
public class CustomerException implements HandlerExceptionResolver {
	@Override
	public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object hanlder,
			Exception e) {
		//記錄日誌
		e.printStackTrace();
		//錯誤消息 
		String msg = "很抱歉，系統發生異常了，請聯繫管理員";
		
		//響應用戶錯誤提示
		ModelAndView mav = new ModelAndView();
		//返回錯誤消息
		mav.addObject("msg", msg);
		//響應錯誤提示頁面
		mav.setViewName("msg");
		return mav;
	}
}

// 註冊
<bean class = "com.myproject.springmvc.CustomerException"/>

全局過濾器

// 定義全局過濾器
import org.springframework.web.filter.OncePerRequestFilter;
 
public class TestFilter extends OncePerRequestFilter {
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
			throws ServletException, IOException {
		//在DispatcherServlet之前執行
		system.out.println("############TestFilter1 doFilterInternal executed############");
		filterChain.doFilter(request, response);
		//在視圖頁面返回給客戶端之前執行，但是執行順序在Interceptor之後
		System.out.println("############TestFilter1 doFilter after############");
	}
}



<!-- 註冊自定義過濾器：testFilter1 -->	
<filter>
		<filter-name>testFilter</filter-name>
		<filter-class>cn.zifangsky.filter.TestFilter1</filter-class>
</filter>

攔截器

// 定義攔截器
public class BaseInterceptor implements HandlerInterceptor{
	/**
	 * 在DispatcherServlet之前執行
	 * */
	public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2) throws Exception {
		System.out.println("************BaseInterceptor preHandle executed**********");
		return true;
	}
 
	/**
	 * 在controller執行之後的DispatcherServlet之後執行
	 * */
	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
			throws Exception {
		System.out.println("************BaseInterceptor postHandle executed**********");
	}
	
	/**
	 * 在頁面渲染完成返回給客戶端之前執行
	 * */
	public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
			throws Exception {
		System.out.println("************BaseInterceptor afterCompletion executed**********");
//		Thread.sleep(10000);
	}
}

<!-- 註冊攔截器 -->
 	<mvc:interceptors>
		<!-- 對所有請求都攔截，公共攔截器可以有多個 -->
		<bean name="baseInterceptor" class="cn.zifangsky.interceptor.BaseInterceptor" />
		<mvc:interceptor>		
			<!-- 對/test.html進行攔截 -->
			<mvc:mapping path="/test.html"/>
		</mvc:interceptor>
	</mvc:interceptors>