spring中,文件上传对文件大小的处理(四)_自定义捕捉MaxUploadSizeExceededException拦截器...
一个相对完美的解决方案就是使用sprngMVC拦截器。(转载自其博文)
1.更改你的MultipartListenerResolver的maxUploadSize属性(spring的xml中的配置,具体见上一篇文章),使其尽量大,避免上传文件时异常被springMVC框架抛出
2.在springmvc-servlet.xml文件中加入拦截器配置,如下:
<mvc:interceptors> <mvc:interceptor> <mvc:mapping path="/**" /> <bean class="com.youth.controller.fileupload.FileUploadInterceptor"> <!-- 1M --> <property name="maxSize" value="1048576" /> </bean> </mvc:interceptor></mvc:interceptors>
注意这里的maxSize才是允许上传的最大文件大小。 FileUploadInterceptor.java代码如下:
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.servlet.ServletRequestContext;
import org.springframework.web.multipart.MaxUploadSizeExceededException;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
public class FileUploadInterceptor implements HandlerInterceptor {
private long maxSize;
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
if(request!=null && ServletFileUpload.isMultipartContent(request)) {
ServletRequestContext ctx = new ServletRequestContext(request);
long requestSize = ctx.contentLength();
if (requestSize > maxSize) {
throw new MaxUploadSizeExceededException(maxSize); //在这里捕捉异常,可以在这里定义异常的处理
}
}
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
}
public void setMaxSize(long maxSize) {
this.maxSize = maxSize;
}
}