springmvc的异常处理有局部异常和全局异常。
一、局部异常（只针对当前的Controller）
?实现步骤：创建自定义异常类：
package com.song.ssm.util;
public class MyException extends RuntimeException {
public MyException() {
}
public MyException(String message) {
super(message);
}
public MyException(String message, Throwable cause) {
super(message, cause);
}
public MyException(Throwable cause) {
super(cause);
}
public MyException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
super(message, cause, enableSuppression, writableStackTrace);
}
}
控制器中添加异常处理方法：
@ExceptionHandler(MyException.class)
public String execptionHandle(HttpServletRequest request,MyException myException){
request.setAttribute("mess",myException.getMessage());
return "error";
}二、全局异常（针对整个项目）
1：xml实现方式：在springmvc的配置文件中添加如下代码：
<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
<property name="exceptionMappings">
<props>
<prop key="com.song.ssm.util.MyException">error</prop>
<prop key="java.lang.NullPointerException">error1</prop>
<prop key="java.lang.ArrayIndexOutOfBoundsException">error2</prop>
</props>
</property>
</bean>2：annotation方式：创建全局异常处理类：
@ControllerAdvice
public class ExceptionController {
@ExceptionHandler(NullPointerException.class)
public String nullHandlerException(Model model){
model.addAttribute("mess","空指针异常！");
return "error1";
}
@ExceptionHandler(ArrayIndexOutOfBoundsException.class)
public String arrayHandlerException(Model model){
model.addAttribute("mess","下标越界异常！");
return "error2";
}
}分别在error1和error2页面中显示对应的异常消息即可！
