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利用MultipartFile實現(xiàn)文件上傳功能

更新時間：2017年11月20日 15:48:33 作者：hbcui1984

這篇文章主要為大家詳細介紹了利用MultipartFile實現(xiàn)文件上傳功能，具有一定的參考價值，感興趣的小伙伴們可以參考一下

在java中上傳文件似乎總有點麻煩，沒.net那么簡單，記得最開始的時候用smartUpload實現(xiàn)文件上傳，最近在工作中使用spring的MultipartFile實現(xiàn)文件上傳，感覺挺簡單，在這里和大家分享一下。

一.主要有兩個java類,和一般的servlet放在一起即可.

1.FileUploadBean.java

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

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("上傳失?。何募?#65533;空");  
      }
      if(file.getSize()>10000000)    
      {
        throw new Exception("上傳失敗：文件大小不能超過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("上傳失?。荷蟼魑募荒転?#65533;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,大家應(yīng)該都很熟悉了

  <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,這里要配置映射,并可以設(shè)定最大可上傳文件的大小

<?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 用來標識method的變量名定義-->
  <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"/>
    <!-- 上傳失敗時跳轉(zhuǎn)頁面 -->
    <property name="formView" value="/user/err.jsp"/>
    <!-- 上傳成功時跳轉(zhuǎn)頁面 -->
     <property name="successView" value="/user/confirmation.jsp"/>
  </bean>
</beans>

三.設(shè)定jsp頁面

 <form id="form1" method="post" action="upload.do" enctype="multipart/form-data">        
  <tr>
    <td width="25%" align="right">上傳文件：</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="確認上傳"></td>
  </tr>
</form>

ok,現(xiàn)在就可以上傳文件了,挺簡單吧?這里我只列出了基本步驟,至于具體的操作(比如中文問題)可能就需要大家自己再完善完善了.

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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