Java文件上传相关知识及得到后缀名

文件上传功能是最基本的所以需要真正的掌握

Java代码

=========文件上传功能================

@Property

private UploadedFile file;

@Inject

private ApplicationGlobals globals;

//获得绝对路径

String path = globalsgetServletContext()getRealPath(/images/person/head);

File copied = new File(path +/+ filegetFileName());

filewrite(copied); //写入项目

===========js=============

function fileBtn(){

var file=documentgetElementById(file)value;

//var houzui=kzName(file);

//获取文件后缀名并转成小写

var ext=filesubstring(filelastIndexOf())toLowerCase();

if( filevalue==){

alert(请选择上传的图片);

return false;

}else{

if(ext!=gif && ext!=jpg && ext!=jpeg && ext!=bmp) {

alert(此图片类型不支持:[ +ext+ ]);

return false;

}

}

return true;

}

//获取后缀名

function kzName(u)

{

var s = /[^]+$/exec(u);

return (s!=null)?s[]:null;

}

=============filetml================

<div id=fileDiv>

<t:form>

图片上传

<input t:type=upload t:id=file name=file size=/>

<input type=submit value=提 交 onclick=return fileBtn();/>

</t:form>

<! 用来提示信息 >

<div><span  id=errormsg><t:if t:test=errorCode>${errorMsg}</t:if></span></div>

</div>

===============filejava===相关代码=============

@Property

private UploadedFile file;

@Persist(PersistenceConstantsFLASH)

@Property

private String message;

@Inject

private Messages messages;

@Property

@Persist(value=flash)

private int errorCode;

Object onUploadException(FileUploadException ex)

{

message = Upload exception: + exgetMessage();

return this;

}

//用来在页面做提示信息

public String getErrorMsg(){

switch (errorCode) {

case :

return messagesget(fileNameMsg);

case :

return messagesget(fileSuccess);

default:

break;

}

return ;

}