问在JSP中使用上传文件，并在上传之前在type=file中执行一些检查...

EN

<input id='fileBrowse' type='file' style="width:187px;height:20px" class='fileBrowse' onchange="onBrowseFile( this );" />

    function onBrowseFile( fb ) {
    var myFSO = new ActiveXObject("Scripting.FileSystemObject");
    var thefile = myFSO.getFile(fb.value);
    if( (thefile.size / 1000000) > maxfilesize) {
        alert( "The size of the files you have tried to drag and drop exceed the maximum allowed. Please drag no more than "+maxfilesize+" MB at a time." );
        return;
    }
    if( fb.value.indexOf( ".exe" ) > -1 ||
            fb.value.indexOf( ".asp" ) > -1 ||
            fb.value.indexOf( ".aspx" ) > -1 ||
            fb.value.indexOf( ".cab" ) > -1 ||
            fb.value.indexOf( ".com" ) > -1 ||
            fb.value.indexOf( ".dll" ) > -1 ||
            fb.value.indexOf( ".java" ) > -1) {
        alert( "The import of one or more files type are not permitted" );
        return;
    }
    document.getElementById( "txtFilePath" ).value = fb.value;
}