Question

我不知道为什么但outStream = new FileOutputStream(file)和inStream = new FileInputStream(new File(file1.getName()))会抛出异常。我不知道该怎么做。

以下是一些代码：

        File tempf = new File(cmds[1]); //cmds is a String with filename cmds[1] and  pathname cmds[2] where to move the file
        File tempw = new File(cmds[2]);
        if(!tempf.isAbsolute() || !tempw.isAbsolute()){//here i make paths absolute
            tempf = new File(tempf.getAbsolutePath());
            tempw = new File(tempw.getAbsolutePath());
        }
        String from = cmds[1];
        String where = cmds[2];
        File file1 = tempf;
        File file2 = new File (tempw.toString() + "/" + new File(cmds[1]).getName());
        InputStream inStream = null;
        OutputStream outStream = null;
        try {
            inStream = new FileInputStream(new File(file1.getName())); //throws an exception
            outStream = new FileOutputStream(file2); //throws an exception too
            byte[] buffer = new byte[16384];
            int length;
            while ((length = inStream.read(buffer)) > 0) {
                outStream.write(buffer, 0, length);
            }

            if (inStream != null)
                inStream.close();
            if (outStream != null)
                outStream.close();
            file1.delete();

        } catch (IOException e) {
            System.err.println("permission denied");
        }
    } else {
        System.err.println("incorrect syntax");
    }
    continue;
}

看起来一切都应该正常，但事实并非如此。我正在

java.io.FileNotFoundException: C:\Users\Maxim\IdeaProjects\Testing\OneDrive\1234.txt

但是我认为这是错误的道路。真实路径为C:\Users\Maxim\OneDrive

UPD！我们发现问题是getAbsolutePath()返回项目所在的路径，但它不是我需要的路径。我需要C:\Users\Maxim\OneDrive但它返回C:\Users\Maxim\IdeaProjects\Testing\OneDrive但是！ .../Testng没有OneDrive！

Answer 1

如果访问文件时出现问题，FileInputStream和FileOutputStream的构造函数会抛出错误，就好像它不存在一样。要阻止它抛出FileNotFoundException，请确保在实例化FileInput / OutputStream对象之前创建该文件。

try{
    FileInputStream fis = new FileInputStream(file);
}catch(FileNotFoundException e){
    e.printStackTrace();
}

查看文档here。

文件路径不正确

1 个答案: