java.io.FileNotFoundException:(只读文件系统)Mac [英] java.io.FileNotFoundException: (Read-only file system) Mac
问题描述
我有一个SpringBoot应用程序,尝试在其中测试条形码的生成,但出现此错误 java.io.FileNotFoundException :(只读文件系统)Mac
.
I have a SpringBoot app in which I am trying to test generation of barcodes but I am getting this error java.io.FileNotFoundException: (Read-only file system) Mac
.
以下是完成此任务的代码:
Here's the code to accomplish this task:
pom.xml
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>net.sf.barcode4j</groupId>
<artifactId>barcode4j</artifactId>
<version>2.1</version>
</dependency>
测试类
public class FooTest extends TestCase {
@Test
public void testP() {
try {
Code128Bean bean = new Code128Bean();
final int dpi = 160;
//Configure the barcode generator
bean.setModuleWidth(UnitConv.in2mm(2.8f / dpi));
bean.doQuietZone(false);
//Open output file
File outputFile = new File("/" + "test" + ".JPG");
FileOutputStream out = new FileOutputStream(outputFile);
BitmapCanvasProvider canvas = new BitmapCanvasProvider(
out, "image/x-png", dpi, BufferedImage.TYPE_BYTE_BINARY, false, 0);
//Generate the barcode
bean.generateBarcode(canvas, "test");
//Signal end of generation
canvas.finish();
System.out.println("Bar Code is generated successfully…");
}
catch (IOException ex) {
ex.printStackTrace();
}
}
}
错误
java.io.FileNotFoundException: /test.JPG (Read-only file system)
at java.io.FileOutputStream.open0(Native Method)
at java.io.FileOutputStream.open(FileOutputStream.java:270)
at java.io.FileOutputStream.<init>(FileOutputStream.java:213)
at java.io.FileOutputStream.<init>(FileOutputStream.java:162)
关于如何在计算机(MacBook)上实现此功能的任何想法?Linux的配置会有所不同吗?
Any ideas on how I could make this work on my machine (MacBook)? Would the configuration be different for Linux?
推荐答案
问题是这样的:
File outputFile = new File("/" + "test" + ".JPG");
请注意,"/"是根目录.
Note that "/" is the root directory.
Mac OS上的根目录显然位于只读文件系统中.这意味着您无法对其进行写操作.
The root directory on Mac OS is apparently in a read-only file system. That means you cannot write to it.
在Linux/UNIX系统上,根文件系统通常不是只读的,但是您的应用程序仍然无权写入根目录.
On Linux / UNIX systems, the root filesystem is typically not read-only, but your application won't have permission to write to the root directory anyway.
关于如何进行这项工作的任何想法.
Any ideas on how I could make this work.
不要尝试将文件写入根目录"/".找到更合适的地方;例如当前的工作目录,用户的主目录,临时目录等.
Don't try to write files into the root directory "/". Find somewhere more appropriate; e.g. the current working directory, the user's home directory, a temporary directory, etcetera.
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