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;
}
}
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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();
}
}
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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 >
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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 >
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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 >
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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服务器之家。
原文链接:http://blog.csdn.net/hbcui1984/article/details/1498112