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()
}
Java中读取txt文件可以使用file类先创建一个对象，然后使用I/O操作，进行读取或者写入操作，示例如下：\x0d\x0aimportjava.io.BufferedReader\x0d\x0aimportjava.io.File\x0d\x0aimportjava.io.FileInputStream\x0d\x0aimportjava.io.FileNotFoundException\x0d\x0aimportjava.io.FileOutputStream\x0d\x0aimportjava.io.IOException\x0d\x0aimportjava.io.InputStreamReader\x0d\x0aimportjava.io.PrintWriter\x0d\x0a\x0d\x0apublicclassdemo2{\x0d\x0aprivatestaticStringpath="f:/demo1.txt"\x0d\x0aprivatestaticFilefile\x0d\x0astatic{\x0d\x0afile=newFile(path)\x0d\x0aif(!file.exists()){\x0d\x0atry{\x0d\x0afile.createNewFile()\x0d\x0a}catch(IOExceptione){\x0d\x0ae.printStackTrace()\x0d\x0a}\x0d\x0a}\x0d\x0a}\x0d\x0a\x0d\x0apublicstaticvoidmain(String[]args)throwsIOException{\x0d\x0aStudentstu=newStudent(1,"张三",90)\x0d\x0awriteDataToFile(file,stu)\x0d\x0areadDataFromFile(file)\x0d\x0a}\x0d\x0a\x0d\x0aprivatestaticvoidreadDataFromFile(Filefile)throwsIOException{\x0d\x0aBufferedReaderreader=newBufferedReader(newInputStreamReader(newFileInputStream(file)))\x0d\x0aStringstr=""\x0d\x0awhile((str=reader.readLine())!=null){\x0d\x0aString[]stuInfo=str.split(",")\x0d\x0aSystem.out.println("学号："+stuInfo[0]+"姓名："+stuInfo[1]+"score："+stuInfo[2])\x0d\x0a}\x0d\x0a}\x0d\x0a\x0d\x0aprivatestaticvoidwriteDataToFile(Filefile,Studentstu)throwsFileNotFoundException{\x0d\x0aPrintWriterout=newPrintWriter(newFileOutputStream(file,true))\x0d\x0aout.println(stu.toString())\x0d\x0aout.close()\x0d\x0a}\x0d\x0a}
