在 Java 中将 InputStream 转换为 FileItem
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时间：2020-10-31 01:26:20 来源:igfitidea点击:
Transform InputStream to FileItem in Java
提问by MrGreen
How can I do to transform from InputStream to FileItem in Java?
如何在 Java 中从 InputStream 转换为 FileItem？
Thanks.
谢谢。
回答by pXel
Here is a working example. Note that you must change the InputStream from the example with your InputStream, and also you might want to change the location of your work/tmp dir().
这是一个工作示例。请注意，您必须使用 InputStream 更改示例中的 InputStream，并且您可能还想更改 work/tmp dir() 的位置。
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItem;
public class TestFile {
public static void main(String args[]) throws IOException {
// This is a sample inputStream, use your own.
InputStream inputStream = new FileInputStream("c:\Kit\Apache\geronimo-tomcat6-javaee5-2.1.6\README.txt");
int availableBytes = inputStream.available();
// Write the inputStream to a FileItem
File outFile = new File("c:\tmp\newfile.xml"); // This is your tmp file, the code stores the file here in order to avoid storing it in memory
FileItem fileItem = new DiskFileItem("fileUpload", "plain/text", false, "sometext.txt", availableBytes, outFile); // You link FileItem to the tmp outFile
OutputStream outputStream = fileItem.getOutputStream(); // Last step is to get FileItem's output stream, and write your inputStream in it. This is the way to write to your FileItem.
int read = 0;
byte[] bytes = new byte[1024];
while ((read = inputStream.read(bytes)) != -1) {
outputStream.write(bytes, 0, read);
}
// Don't forget to release all the resources when you're done with them, or you may encounter memory/resource leaks.
inputStream.close();
outputStream.flush(); // This actually causes the bytes to be written.
outputStream.close();
// NOTE: You may also want to delete your outFile if you are done with it and dont want to take space on disk.
}
}
