JAVA端 创建FORMFILE实例

Question

// FormFile
        Class parentClass = Class.forName("org.apache.struts.upload.CommonsMultipartRequestHandler");
        Class childClass = parentClass.getDeclaredClasses()[0];
        Constructor c = childClass.getConstructors()[0];
        c.setAccessible(true);
        DiskFileItemFactory factory = new DiskFileItemFactory();
        factory.setSizeThreshold(1000 * 1000 * 10);
        factory.setRepository(new File("E:\\aa.txt"));
        FileItem fileitem = factory.createItem("uploadfile", "application/txt", false, "E:\\aa.txt");
        try{
            FileInputStream fis = new FileInputStream(new File("E:\\aa.txt"));
            InputStreamReader inStream = new InputStreamReader(fis);
            OutputStream outStream = fileitem.getOutputStream();
            char[] charBuff = new char[1024];
            byte[] byteBuff = new byte[1024];
            while(inStream.read(charBuff) != -1){
                for(int i = 0; i < 1024; i++){
                    byteBuff[i] = (byte)charBuff[i];
                }
                outStream.write(byteBuff);
            }            outStream.flush();
            inStream.close();
        }catch(Exception e){
            e.printStackTrace();
        }
        FormFile file = (FormFile)c.newInstance(new Object[]{fileitem});        c.setAccessible(false);