利用MultipartFile实现文件上传
利用MultipartFile实现文件上传
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
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();
}
}
利用MultipartFile实现文件上传
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
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();
}
}
