spring mvc3中异常处理
在spring mvc3中，处理异常可以这样做，
首先定义一个自定义的异常类：
1 public class GenericException extends RuntimeException{
private String customMsg;
//getter and setter methods
public GenericException(String customMsg) {
this.customMsg = customMsg;
}
}
2 web.xml
<web-app ...>
<error-page>
<error-code>404</error-code>
<location>/WEB-INF/pages/404.jsp</location>
</error-page>
<error-page>
<exception-type>java.lang.Exception</exception-type>
<location>/WEB-INF/pages/404.jsp</location>
</error-page>
</web-app>
3 控制器
CustomerController.java
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;
import com.mkyong.common.exception.GenericException;
public class CustomerController extends AbstractController{
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request,
HttpServletResponse response) throws Exception {
throw new GenericException("Oppss...System error, please visit it later");
}
}
4 <beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<bean
/>
<!-- Register the bean -->
<bean />
<bean >
<property name="prefix">
<value>/WEB-INF/pages/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
</beans>
5 要注意的是，这里用了SimpleMappingExceptionResolver，
当抛出com.mkyong.common.exception.GenericException时，会先于web.xml抛出异常，这时就去到
/WEB-INF/pages/GenericExceptionPage.jsp这个页面处理你的自定义异常了
