文件从本地到服务器的功能，其实是为了解决目前浏览器不支持获取本地文件全路径。不得已而想到上传到服务器的固定目录，从而方便项目获取文件，进而使程序支持EXCEL批量导入数据。
java中文件上传到服务器的指定路径的代码：
在前台界面中输入：
<form method="post" enctype="multipart/form-data" action="../manage/excelImport.do">
请选文件:<input type="file" name="excelFile">
<input type="submit" value="导入" onclick="return impExcel()"/>
</form>
action中获取前台传来数据并保存
/**
* excel 导入文件
* @return
* @throws IOException
*/
@RequestMapping("/usermanager/excelImport.do")
public String excelImport(
String filePath,
MultipartFile excelFile,HttpServletRequest request) throws IOException{
log.info("<<<<<<action:{} Method:{} start>>>>>>","usermanager","excelImport" )
if (excelFile != null){
String filename=excelFile.getOriginalFilename()
String a=request.getRealPath("u/cms/www/201509")
SaveFileFromInputStream(excelFile.getInputStream(),request.getRealPath("u/cms/www/201509"),filename)//保存到服务器的路径
}
log.info("<<<<<<action:{} Method:{} end>>>>>>","usermanager","excelImport" )
return ""
}
/**
* 将MultipartFile转化为file并保存到服务器上的某地
*/
public void SaveFileFromInputStream(InputStream stream,String path,String savefile) throws IOException
{
FileOutputStream fs=new FileOutputStream( path + "/"+ savefile)
System.out.println("------------"+path + "/"+ savefile)
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()
}
在Java中可以用struts2实现多个文件同时上传代码，功能代码如下：
1、upload.jsp页面（选择上传文件）
<form action="upload.action" name="uploadForm" method="post" enctype="multipart/form-data">文件标题：<input type="text" name="title"/><br/>
选择文件-：<input type="file" name="upload"/><br/>
选择文件二：<input type="file" name="upload"/><br/>
选择文件三：<input type="file" name="upload"/><br/>
<input type="submit" value="upload"/>
</form>
2、action代码如下：
//对应的Action依次遍历所有文件域，然后生成对应的输入文件流，输出文件流在指定的服务器保存路径中添加对应的输出文件流保存文件。同时动态指定服务器上文件的保存路径。package com.inspur.action
import java.io.File
import java.io.FileInputStream
import java.io.FileOutputStream
import org.apache.struts2.ServletActionContext
import com.opensymphony.xwork2.ActionSupport
public class UploadAction extends ActionSupport {
private String title
private File[] upload
private String[] uploadFileName
private String[] uploadContentType
private String savePath
public String getTitle() {
return title
}
public void setTitle(String title) {
this.title = title
}
public File[] getUpload() {
return upload
}
public void setUpload(File[] upload) {
this.upload = upload
}
public String[] getUploadFileName() {
return uploadFileName
}
public void setUploadFileName(String[] uploadFileName) {
this.uploadFileName = uploadFileName
}
public String[] getUploadContentType() {
return uploadContentType
}
public void setUploadContentType(String[] uploadContentType) {
this.uploadContentType = uploadContentType
}
public String getSavePath() {
return ServletActionContext.getRequest().getRealPath(savePath)
}
public void setSavePath(String savePath) {
this.savePath = savePath
}
public String upload()throws Exception{
File[] files=this.getUpload()
for(int i=0i<files.lengthi++){
FileOutputStream fos=new FileOutputStream(this.getSavePath()+"\\"+this.getUploadFileName()[i])
byte[] buffer=new byte[1024]
FileInputStream fis=new FileInputStream(files[i])
int len=0
while((len=fis.read(buffer))>0){
fos.write(buffer,0,len)
}
}
return SUCCESS
}
}
3、success.jsp页面代码如下（上传成功界面显示所有上传的图片）
文件标题：<s:property value="title"/><br/>第一个图片：<img alt="first" src="<s:property value="'upload/'+uploadFileName[0]"/>"/><br/>
第二个图片：<img alt="second" src="<s:property value="'upload/'+uploadFileName[1]"/>"/><br/>
