How to loop through multiple files to process each

Question

I have a functioning class serverCfgParser that works perfectly for a single file:

serverCfgParser.parseFile("src/main/resources/static/server_dev_devops_pc.cfg");

I need to change the logic so that multiple files ending with.cfg get processed. I want to pass in a variable instead of a hard coded path. Ill need to loop all files in a given directory and pass those onto serverCfgParser. I have looked at some examples but can get this to work.

File serverConfigs = new File("src/main/resources/static");
File[] files = serverConfigs.listFiles((d, name) -> name.endsWith(".cfg"));

for (File configFile : files) {
    System.out.println(configFile);
}

ServerCfgParser serverCfgParser = new ServerCfgParser();

for (File configFile : files) {
    Charset encoding = Charset.defaultCharset();
    List<String> lines = Files.readAllLines(Paths.get(configFile), encoding);
    serverCfgParser.parseFile(configFile);
}

I used the first for loop to prove to test that file paths were being populated correctly.

src\main\resources\static\server_dev_aws_app1.cfg
src\main\resources\static\server_dev_aws_app2.cfg
src\main\resources\static\server_dev_aws_app3.cfg
src\main\resources\static\server_dev_aws_app4.cfg
src\main\resources\static\server_dev_aws_app5.cfg
src\main\resources\static\server_dev_aws_app6.cfg
src\main\resources\static\server_dev_devops_app1.cfg
src\main\resources\static\server_dev_devops_app2.cfg
src\main\resources\static\server_dev_devops_app3.cfg
src\main\resources\static\server_dev_devops_app4.cfg
src\main\resources\static\server_dev_devops_app5.cfg
src\main\resources\static\server_dev_devops_app6.cfg
src\main\resources\static\server_dev_mansible_app5.cfg
src\main\resources\static\server_dev_mansible_app6.cfg
src\main\resources\static\server_test_mansible_app5.cfg
src\main\resources\static\server_test_mansible_app6.cfg

JAVA is complaining about Paths.get(configFile) :

The method get(URI) in the type Paths is not applicable for the arguments (File)

I get what its complaining about, but not sure how to feed in the right params. Every example I looked at is as above but for single files only, I have yet to find an example of looping through multiple files.

Help is greatly appreciated.

Answer 1

You could use the toPath method of the File class:

Charset encoding = Charset.defaultCharset();
for (File configFile : files) {
    List<String> lines = Files.readAllLines(configFile.toPath(), encoding);
    serverCfgParser.parseFile(configFile.toString());
}