下载文件中的字符串怪异符号
我有一个字符串数组，其中包含可下载文件的内容。我将其转换为流以进行下载，但是下载文件中有一些随机值。我不知道这是否是由于编码，如果是的，我该如何更改？
var downloadButton = new DownloadLink(btn, "test.csv", () -> {
try {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);
for (int i = 0; i < downloadContent.size(); i++) {
objectOutputStream.writeUTF(downloadContent.get(i));
}
objectOutputStream.flush();
objectOutputStream.close();
byte[] byteArray = byteArrayOutputStream.toByteArray();
ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(byteArray);
ObjectInputStream objectInputStream = new ObjectInputStream(byteArrayInputStream);
objectInputStream.close();
return new ByteArrayInputStream(byteArray);
这是下载链接类。
public class DownloadLink extends Anchor {
public DownloadLink(Button button, String fileName, InputStreamFactory fileProvider) {
super(new StreamResource(fileName, fileProvider), "");
getElement().setAttribute("download", fileName);
add(button);
getStyle().set("display", "contents");
}
}
I've got a String array that contains the content for a downloadable file. I am converting it to a Stream for the download but there are some random values in the downloadfile. I don't know if it is due to the encoding and if yes, how can I change it?
var downloadButton = new DownloadLink(btn, "test.csv", () -> {
try {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);
for (int i = 0; i < downloadContent.size(); i++) {
objectOutputStream.writeUTF(downloadContent.get(i));
}
objectOutputStream.flush();
objectOutputStream.close();
byte[] byteArray = byteArrayOutputStream.toByteArray();
ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(byteArray);
ObjectInputStream objectInputStream = new ObjectInputStream(byteArrayInputStream);
objectInputStream.close();
return new ByteArrayInputStream(byteArray);
This is the DownloadLink class.
public class DownloadLink extends Anchor {
public DownloadLink(Button button, String fileName, InputStreamFactory fileProvider) {
super(new StreamResource(fileName, fileProvider), "");
getElement().setAttribute("download", fileName);
add(button);
getStyle().set("display", "contents");
}
}
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ObjectOutputStream是Java序列化系统的一部分。除了数据本身外，它还还包括有关原始Java类型等的元数据。它仅用于撰写数据，以后将使用ObjectInputStream回复。要创建一个供其他人下载的文件，您可以使用包装原始输出流的
printWriter。另一方面，您正在使用输出流来创建byte []，这意味着一种更直接但效率略低的方法是从所有数组元素中创建一个串联的字符串然后使用getBytes（standardcharsets.utf_8）直接获得字节数组。ObjectOutputStreamis part of the Java serialization system. In addition to the data itself, it also includes metadata about the original Java types and such. It's only intended for writing data that will later be read back usingObjectInputStream.To create a file for others to download, you could instead use a
PrintWriterthat wraps the original output stream. On the other hand, you're using the output stream to create abyte[]which means that a more straightforward, but slightly less efficient, way would be to create a concatenated string from all the array elements and then usegetBytes(StandardCharsets.UTF_8)on it to directly get a byte array.