增加springmvc 全局异常处理、拦截器示例代码

spring/springmvc-base/src/main/java/com/heibaiying/controller/HelloController.java

@@ -1,8 +1,10 @@
 package com.heibaiying.controller;
 
+import com.heibaiying.exception.NoAuthException;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
 
+
 /**
  * @author : heibaiying
  * @description : hello spring
@@ -16,4 +18,10 @@ public class HelloController {
     private String hello() {
         return "hello";
     }
+
+
+    @RequestMapping("auth")
+    private void auth() {
+        throw new NoAuthException("没有对应的访问权限！");
+    }
 }

spring/springmvc-base/src/main/java/com/heibaiying/exception/NoAuthException.java

@@ -0,0 +1,25 @@
+package com.heibaiying.exception;
+
+/**
+ * @author : heibaiying
+ * @description : 自定义无权限异常
+ */
+public class NoAuthException extends RuntimeException {
+
+    public NoAuthException() {
+        super();
+    }
+
+    public NoAuthException(String message) {
+        super(message);
+    }
+
+    public NoAuthException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public NoAuthException(Throwable cause) {
+        super(cause);
+    }
+
+}

spring/springmvc-base/src/main/java/com/heibaiying/exception/NoAuthExceptionResolver.java

@@ -0,0 +1,26 @@
+package com.heibaiying.exception;
+
+import org.springframework.web.servlet.HandlerExceptionResolver;
+import org.springframework.web.servlet.ModelAndView;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * @author : heibaiying
+ * @description : 无权限异常处理机制
+ */
+public class NoAuthExceptionResolver implements HandlerExceptionResolver {
+
+    public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
+        if (ex instanceof NoAuthException && !isAjax(request)) {
+            return new ModelAndView("NoAuthPage");
+        }
+        return new ModelAndView();
+    }
+
+    // 判断是否是Ajax请求
+    private boolean isAjax(HttpServletRequest request) {
+        return "XMLHttpRequest".equalsIgnoreCase(request.getHeader("X-Requested-With"));
+    }
+}

spring/springmvc-base/src/main/java/com/heibaiying/interceptors/MyFirstInterceptor.java

@@ -0,0 +1,27 @@
+package com.heibaiying.interceptors;
+
+import org.springframework.web.servlet.HandlerInterceptor;
+import org.springframework.web.servlet.ModelAndView;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * @author : heibaiying
+ * @description : spring5 中 preHandle，postHandle，afterCompletion 在接口中被声明为默认方法
+ */
+public class MyFirstInterceptor implements HandlerInterceptor {
+
+    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
+        System.out.println("进入第一个拦截器preHandle");
+        return true;
+    }
+
+    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
+        System.out.println("进入第一个拦截器postHandle");
+    }
+
+    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
+        System.out.println("进入第一个拦截器afterCompletion");
+    }
+}

spring/springmvc-base/src/main/java/com/heibaiying/interceptors/MySecondInterceptor.java

@@ -0,0 +1,27 @@
+package com.heibaiying.interceptors;
+
+import org.springframework.web.servlet.HandlerInterceptor;
+import org.springframework.web.servlet.ModelAndView;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * @author : heibaiying
+ * @description : spring5 中 preHandle，postHandle，afterCompletion 在接口中被声明为默认方法
+ */
+public class MySecondInterceptor implements HandlerInterceptor {
+
+    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
+        System.out.println("进入第二个拦截器preHandle");
+        return true;
+    }
+
+    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
+        System.out.println("进入第二个拦截器postHandle");
+    }
+
+    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
+        System.out.println("进入第二个拦截器afterCompletion");
+    }
+}