I want to read Name property from configuration file
config.properties
Person{ Name= ABC PhoneNumber=123 } Address { Pin=500 } I tried
public Properties readConfiguration() { File configFile1 = new File("config.properties"); try { FileReader reader = new FileReader(configFile1); Properties props = new Properties(); props.load(reader); reader.close(); return props; } catch (FileNotFoundException ex) { // file does not exist } catch (IOException ex) { // I/O error } return null; } But this function is not able to read nested properties.
Please help me find the solution.
3 Answers
Answers 1
your file config.properties structure looks like json format and to my understanding you want to parse a json file, correct me if i am wrong. To read or write from a json objects u can use Gson like this
my json file
{ Person:{ "Name" = "ABC", "PhoneNumber" = 123 }, Address: { "Pin" = 500 } } My POJO classes includes
public class Person { private String Name; private int PhoneNumber; public Person() { } public String getName() { return Name; } public void setName(String name) { Name = name; } public int getPhoneNumber() { return PhoneNumber; } public void setPhoneNumber(int phoneNumber) { PhoneNumber = phoneNumber; } } public class Address{ private String Pin; public Address() { } public String getPin() { return Pin; } public void setPin(String pin) { Pin = pin; } } public class Config{ private Person person; private Address address; public Config() { } public Person getPerson() { return person; } public void setPerson(Person person) { this.person = person; } public Address getAddress() { return address; } public void setAddress(Address address) { this.address = address; } } read the file convert to string and then read json object using Gson.
Scanner scanner = new Scanner(new File("config.properties")); String fileStr=""; while (scanner.hasNextLine()){ fileStr+=scanner.nextLine(); } Gson gson = new Gson(); Config config =gson.fromJson(fileStr,Config.class); config.getPerson.getPhoneNumber(); Answers 2
It is not legal properties file. But it is legal HOCON conf.
An example of your conf file reading with hocon generated by tscfg.
import com.typesafe.config.Config; import com.typesafe.config.ConfigFactory; import org.junit.Assert; import java.io.File; public class SampleConf { public final SampleConf.Address Address; public final SampleConf.Person Person; public static class Address { public final int Pin; public Address(final com.typesafe.config.Config c) { this.Pin = c.hasPathOrNull("Pin") ? c.getInt("Pin") : 500; } } public static class Person { public final java.lang.String Name; public final int PhoneNumber; public Person(final com.typesafe.config.Config c) { this.Name = c.hasPathOrNull("Name") ? c.getString("Name") : "ABC"; this.PhoneNumber = c.hasPathOrNull("PhoneNumber") ? c.getInt("PhoneNumber") : 123; } } public SampleConf(final com.typesafe.config.Config c) { this.Address = new SampleConf.Address(c.getConfig("Address")); this.Person = new SampleConf.Person(c.getConfig("Person")); } public static void main(final String[] args) { final Config config = ConfigFactory.parseFile( new File(("problem.so.hocon.conf"))) // file path .resolve(); final SampleConf conf = new SampleConf(config); // do everything you like final SampleConf.Address address = conf.Address; final SampleConf.Person person = conf.Person; Assert.assertEquals(500, address.Pin); } } Answers 3
In order to directly answer your question, you are not doing a proper config.properties file.
normally, a property file would look like this as per your example:
//File Name=ABC Phonenumber=123456 pin=1234 In your code, you should be fine by just doing the following after ***props.load(reader)*** (Note I am not copying all your code.)
System.out.println(props.getProperty("Name")); // ABC System.out.println(props.getProperty("Phonenumber")); // 123456 System.out.println(props.getProperty("pin")); // 123 Here I am simply outputting the results but note you can do whatever you wish to do.
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