在Java中將InputStream轉換爲FileItem

Question

如何在Java中將InputStream轉換爲FileItem？

謝謝。

Answer 1

這是一個工作示例。請注意，您必須使用InputStream更改示例中的InputStream，並且您可能還想更改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. 
    } 
}