java 从 BOOT-INF/classes 读取文件
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Read files from BOOT-INF/classes
提问by CPA
I have a Spring Boot application with a java resource folder:
我有一个带有 java 资源文件夹的 Spring Boot 应用程序：
src
|
main
|
resources
|
test
|
test1.json
test2.json
...
In the resource folder there are json files. I can read these files within my IDE (IntelliJ). But as a compiled JAR file, I get Nullpointerexceptions.
在资源文件夹中有 json 文件。我可以在我的 IDE (IntelliJ) 中读取这些文件。但是作为编译的 JAR 文件，我得到了Nullpointer例外。
Spring Boot copies the files to: BOOT-INF/classes/testIs it possible to read the resource files within a JAR file? I don't know the file names. So in first, I have to get all file names and the read each file.
Spring Boot 将文件复制到：BOOT-INF/classes/test是否可以读取 JAR 文件中的资源文件？我不知道文件名。所以首先，我必须获取所有文件名并读取每个文件。
Does anyone have an idea?
有没有人有想法？
UPDATE
更新
I have tried this:
我试过这个：
Resources[] resources = applicationContext.getResources("classpath*:**/test/*.json");
With that I'm getting all file paths. But that needs too much time. And even if I get the file names, how would I read the files?
有了这个，我得到了所有的文件路径。但这需要太多时间。即使我得到了文件名，我将如何读取文件？
采纳答案by artemisian
The below solution will read the files into a Map.
以下解决方案会将文件读入 Map。
Here you read your resources:
在这里您可以阅读您的资源：
Resource[] resources = applicationContext.getResources("classpath*:test/*.json");
for (Resource r: resources) {
processResource(r);
}
Here you process your resources:
在这里处理您的资源：
// you need to add a dependency (if you don't have it already) for com.fasterxml.Hymanson.core:Hymanson-databind
ObjectMapper mapper = new ObjectMapper();
private void processResource(Resource resource) {
try {
Map<String, Object> jsonMap = mapper.readValue(resource.getInputStream(), Map.class);
// do stuffs with your jsoMap
} catch(Exception e){
e.printStackTrace();
}
}
}
回答by abcdefgh
This actually works using a ResourcePatternResolver
这实际上可以使用 ResourcePatternResolver
ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
Resource[] resources = resolver.getResources("classpath*:test/*.json");
for(Resource r: resources) {
InputStream inputStream = r.getInputStream();
File somethingFile = File.createTempFile(r.getFilename(), ".cxl");
try {
FileUtils.copyInputStreamToFile(inputStream, somethingFile);
} finally {
IOUtils.closeQuietly(inputStream);
}
LicenseManager.setLicenseFile(somethingFile.getAbsolutePath());
log.info("File Path is " + somethingFile.getAbsolutePath());
}
