本文共 4392 字，大约阅读时间需要 14 分钟。

最初的疑惑

不知道为什么上传文件大小超出后，触发了异常，但是没有正确跳转。

throw new JerryException("呵呵哒了", 1000);		int a = 1/0;

      	
      		
    
    		
    
    		
    
       	
      	
       
     	
   		
    		
    		
    		
    		
    		
    			
     				
      
       jerryException
       				
      
       limit
      			
     		
    	
   

幡然醒悟

看了别人的帖子

解决方案

添加拦截器判断文件大小，手动抛出异常MaxUploadSizeExceededException

spring-mvc.xml 配置

/ssm/src/main/resources/spring-mvc.xml 省略无关部分

...    
      	
      		
    
       		
    		
    		
       	
      	
       
     	
   		
    		
    		
    		
    		
    		
    			
     				
      
       error\jerryException
      				
      
       error\limit
      			
     		
    	
       
   	
     	     
      	     
    	     	     
      	         
       	         
       	         
     	         	
       
      	         
     	     
      	     	 
   

创建拦截器

/ssm/src/main/java/com/jerry/ssm/interceptor/FileUploadInterceptor.java

package com.jerry.ssm.interceptor;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.tomcat.util.http.fileupload.servlet.ServletFileUpload;import org.apache.tomcat.util.http.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);            }        }        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;    }}

添加控制层（测试异常）

/ssm/src/main/java/com/jerry/ssm/controller/ExceptionController.java

package com.jerry.ssm.controller;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import com.jerry.ssm.exception.JerryException;@Controller@Scope("prototype")@RequestMapping("/exception")public class ExceptionController{
   		/**	 * http://localhost/exception/list	 * @throws JerryException 	 */	@RequestMapping("/list")	public String list() throws JerryException {
   		return "error/exceptionList";	}		/**	 * http://localhost/jerryException	 * @throws JerryException 	 */	@RequestMapping("/jerry")	public String jerryException() throws JerryException {
   		throw new JerryException("呵呵哒了", 1000);	}		/**	 * http://localhost/byZero	 * @throws JerryException 	 */	@RequestMapping("/byZero")	public String byZeroException() throws JerryException {
   		int a = 1/0;		return "";	}}

添加视图（测试异常）

/ssm/src/main/webapp/WEB-INF/jsp/error/exceptionList.jsp

<%@ page language="java" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%>			
   				
   
			
    
				
     
异常测试列表
				
     
JerryException: 呵呵哒了
				
     
ArithmeticException: / by zero
			
    
		
   
	

/ssm/src/main/webapp/WEB-INF/jsp/error/error.jsp

<%@ page language="java" pageEncoding="UTF-8"%>	
   			
   
			
    
     
error
     
出错了啦:${exp}
    
		
   
	

/ssm/src/main/webapp/WEB-INF/jsp/error/jerryException.jsp

<%@ page language="java" pageEncoding="UTF-8"%>	 
    			
   
			
    
 
     
jerryException
 
     
${exp}
 
    
		
   
	

/ssm/src/main/webapp/WEB-INF/jsp/error/limit.jsp

<%@ page language="java" pageEncoding="UTF-8"%>	
   			
   
			
    
     
上传文件最大 2M
     
${
   exp.message}
    
		
   
	

Demo源码

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