利用MultipartFile实现文件上传功能

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;  }}

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();     }    }

  <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>

<?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>

 <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>