在Swing中选择并通过http post发送上传文件，并使用php脚本保存

但是，通过swing使用http post和URL as，它不会在服务器上接收文件。我可以得到帮助吗，php脚本是：

<?php
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fieldName"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
    $check = getimagesize($_FILES["fieldName"]["tmp_name"]);
    if($check !== false) {
        echo "File is an image - " . $check["mime"] . ".";
        $uploadOk = 1;
    } else {
        echo "File is not an image.";
        $uploadOk = 0;
    }
}
// Check if file already exists
if (file_exists($target_file)) {
    echo "Sorry, file already exists.";
    $uploadOk = 0;
}
// Check file size
if ($_FILES["fieldName"]["size"] > 500000) {
    echo "Sorry, your file is too large.";
    $uploadOk = 0;
}
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
    echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
    $uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
    echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
    if (move_uploaded_file($_FILES["fieldName"]["tmp_name"], $target_file)) {
        echo "The file ". basename( $_FILES["fieldName"]["name"]). " has been uploaded.";
    } else {
        echo "Sorry, there was an error uploading your file.";
    }
}
?>

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不使用Swing能否成功上传文件？如果是这样，那么PHP就无关紧要了。如果没有，请卸下回转标记。1。首先检查类似的问题，如：。2.能否将目标目录指定为绝对路径，例如/uploads/而不是相对路径uploads/？3.此外，您还可以简化代码：删除所有检查并使用一些固定值调用move_uploaded_file函数。我想使用swing应用程序选择要上载的文件，并使用php将其更新到服务器