13518219792
使用MultipartFile怎么实现一个文件上传功能？很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
创新互联是一家以网络技术公司，为中小企业提供网站维护、网站制作、成都网站制作、网站备案、服务器租用、国际域名空间、软件开发、小程序定制开发等企业互联网相关业务，是一家有着丰富的互联网运营推广经验的科技公司，有着多年的网站建站经验，致力于帮助中小企业在互联网让打出自已的品牌和口碑，让企业在互联网上打开一个面向全国乃至全球的业务窗口：建站欢迎来电：028-86922220
一.主要有两个java类,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
chb org.springframework.web.servlet.DispatcherServlet 1 chb *.do
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
