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利用MultipartFile实现文件上传功能

转载 作者:qq735679552 更新时间:2022-09-28 22:32:09 25 4
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在java中上传文件似乎总有点麻烦,没.net那么简单,记得最开始的时候用smartUpload实现文件上传,最近在工作中使用spring的MultipartFile实现文件上传,感觉挺简单,在这里和大家分享一下.

一.主要有两个java类,和一般的servlet放在一起即可. 。

1.FileUploadBean.java 。

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package chb.demo.web;
 
import org.springframework.web.multipart.MultipartFile;
 
/**
  * @author chb
  *
  */
public class FileUploadBean {
 
   private MultipartFile file;
 
   public void setFile(MultipartFile file) {
     this .file = file;
   }
 
   public MultipartFile getFile() {
     return file;
   }
}

2.FileUploadController.java 。

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package chb.demo.web;
 
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.springframework.validation.BindException;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;
 
 
/**
  * @author chb
  *
  */
public class FileUploadController extends SimpleFormController {
    
   protected ModelAndView onSubmit(
     HttpServletRequest request,
     HttpServletResponse response,
     Object command,
     BindException errors){
    
     try
     {
       // cast the bean
       FileUploadBean bean = (FileUploadBean) command;
 
       // let's see if there's content there
       MultipartFile file = bean.getFile();
                
       if (file == null ) {
         throw new Exception( "上传失败:文件为�空" ); 
       }
       if (file.getSize()> 10000000 )   
       {
         throw new Exception( "上传失败:文件大小不能超过10M" );     
       }
       //得到文件�名
       String filename=file.getOriginalFilename();   
      
       if (file.getSize()> 0 ){       
         try {
           SaveFileFromInputStream(file.getInputStream(), "D:/" ,filename);
         } catch (IOException e) {
           System.out.println(e.getMessage());
           return null ;
         }
       }
       else {
         throw new Exception( "上传失败:上传文件不能为�空" );
       }
       // well, let's do nothing with the bean for now and return:
       try {
         return super .onSubmit(request, response, command, errors);
        
       } catch (Exception e) {
         System.out.println(e.getMessage());
         return null ;
       }
     }
     catch (Exception ex)
     {
       System.out.println(ex.getMessage());
       return null ;
     }
  
  
   /**保存文件
    * @param stream
    * @param path
    * @param filename
    * @throws IOException
    */
   public void SaveFileFromInputStream(InputStream stream,String path,String filename) throws IOException
   {  
     FileOutputStream fs= new FileOutputStream( path + "/" + filename);
     byte [] buffer = new byte [ 1024 * 1024 ];
     int bytesum = 0 ;
     int byteread = 0 ;
     while ((byteread=stream.read(buffer))!=- 1 )
     {
       bytesum+=byteread;
       fs.write(buffer, 0 ,byteread);
       fs.flush();
     }
     fs.close();
     stream.close();  
   }   
}

二.配置文件中如下配置

1.web.xml,利用spring mvc模式,大家应该都很熟悉了 。

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< servlet >
   < servlet-name >chb</ servlet-name >
   < servlet-class >org.springframework.web.servlet.DispatcherServlet</ servlet-class >
   < load-on-startup >1</ load-on-startup >
</ servlet >
 
< servlet-mapping >
   < servlet-name >chb</ servlet-name >
   < url-pattern >*.do</ url-pattern >
</ servlet-mapping >

2.chb-servlet.xml,这里要配置映射,并可以设定最大可上传文件的大小 。

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<? xml version = "1.0" encoding = "UTF-8" ?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
< beans >
   <!-- Multi-Action 用来标识method的变量名定义-->
   < bean id = "methodNameResolver" class = "org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver" >
     < property name = "paramName" >
       < value >action</ value >
     </ property >
     < property name = "defaultMethodName" >
       < value >index</ value >
     </ property >
   </ bean >
  
   < bean id = "multipartResolver" class = "org.springframework.web.multipart.commons.CommonsMultipartResolver" >
     <!-- one of the properties available; the maximum file size in bytes -->
     < property name = "maxUploadSize" value = "10000000" />
   </ bean >
  
 
   < bean id = "handlerMapping" class = "org.springframework.web.servlet.handler.SimpleUrlHandlerMapping" >
     < property name = "mappings" >
      < props >
       < prop key = "/upload.do" >fileUploadController</ prop >
      </ props >
     </ property >
   </ bean >
  
   < bean id = "fileUploadController" class = "chb.demo.web.FileUploadController" >
     < property name = "commandClass" value = "chb.demo.web.FileUploadBean" />
     <!-- 上传失败时跳转页面 -->
     < property name = "formView" value = "/user/err.jsp" />
     <!-- 上传成功时跳转页面 -->
      < property name = "successView" value = "/user/confirmation.jsp" />
   </ bean >
</ beans >

三.设定jsp页面 。

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< form id = "form1" method = "post" action = "upload.do" enctype = "multipart/form-data" >       
   < tr >
     < td width = "25%" align = "right" >上传文件:</ td >
     < td >< input id = "file" type = "file" NAME = "file" style = "width:300px;" ></ td >
   </ tr >
   < tr align = "center" valign = "middle" >
     < td height = "60" colspan = "2" >< input type = "submit" ID = "BtnOK" value = "确认上传" ></ td >
   </ tr >
</ form

ok,现在就可以上传文件了,挺简单吧?这里我只列出了基本步骤,至于具体的操作(比如中文问题)可能就需要大家自己再完善完善了. 。

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我.

原文链接:http://blog.csdn.net/hbcui1984/article/details/1498112 。

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