異常處理
jsp頁面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h3>異常處理</h3>
<a href="ExceptionController/testException">整個異常</a>
</body>
</html>
ExceptionController
@Controller
@RequestMapping("/ExceptionController")
public class ExceptionController {
@RequestMapping("/testException")
public String testException() throws CustomException {
try {
//模擬異常
int i = 10 / 0;
} catch (Exception e) {
e.printStackTrace();
//拋出自定義異常
throw new CustomException("系統維護中....");
}
return "exception";
}
}
自定義異常類
public class CustomException extends Exception {
private String message;
public CustomException(String message) {
this.message = message;
}
@Override
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
}
異常處理類
public class CustomExceptionResolver implements HandlerExceptionResolver {
/**
* 處理異常邏輯
*
* @param httpServletRequest
* @param httpServletResponse
* @param o
* @param e 當前拋出的異常對象
* @return
*/
@Override
public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {
CustomException exception = null;
if (e instanceof CustomException) {
exception = (CustomException) e;
} else {
exception = new CustomException("系統維護中...");
}
ModelAndView mv = new ModelAndView();
mv.addObject("errMessage", exception);
mv.setViewName("error");
System.out.println(exception);
return mv;
}
}
在配置文件中配置異常處理器
<!--配置異常處理器-->
<bean id="customExceptionResolver" class="com.sx.Exception.CustomExceptionResolver"></bean>
攔截器
jsp頁面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h3>攔截器</h3>
<a href="InterceptorController/testInterceptor">測試</a>
</body>
</html>
跳轉頁面success.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h3>訪問成功</h3>
<%System.out.println("success.jsp");%>
</body>
</html>
InterceptorController
@Controller
@RequestMapping("/InterceptorController")
public class InterceptorController {
@RequestMapping("/testInterceptor")
public String testInterceptor() {
System.out.println("test執行");
return "success";
}
}
兩個攔截器
攔截器1
public class CustomInterceptor implements HandlerInterceptor {
/**
* 預處理,controller方法執行前執行
*
* @param request
* @param response
* @param handler
* @return return true 表示放行,執行下一個攔截器,如果沒有就執行controller中的方法
* @throws Exception
*/
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("preHandle執行了");
return true;
}
/**
* 後處理方法,controller方法執行後,success.jsp執行前執行
*
* @param request
* @param response
* @param handler
* @param modelAndView
* @throws Exception
*/
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("postHandle執行了");
}
/**
* success.jsp執行後執行
*
* @param request
* @param response
* @param handler
* @param ex
* @throws Exception
*/
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("afterCompletion執行了");
}
}
攔截器2
public class CustomInterceptor2 implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("preHandle執行了2");
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("postHandle執行了2");
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("afterCompletion執行了2");
}
}
配置攔截器
<!--配置攔截器-->
<mvc:interceptors>
<mvc:interceptor>
<!--要攔截的具體方法-->
<mvc:mapping path="/InterceptorController/*"/>
<!--不攔截的方法-->
<!--<mvc:exclude-mapping path=""/>-->
<bean id="customInterceptor" class="com.sx.interceptor.CustomInterceptor"></bean>
</mvc:interceptor>
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean id="customInterceptor2" class="com.sx.interceptor.CustomInterceptor2"></bean>
</mvc:interceptor>
</mvc:interceptors>
點擊超鏈接後Controller、攔截器、jsp的執行順序
![在這裏插入圖片描述]()
