Loading a properties file from Java package

Question

I need to read a properties files that s buried in my package structure in com al common email templates   I ve tried everything and I can t figure it out   In the end  my code will be running in a servlet container  but I don t want to depend on the container for anything  I write JUnit test cases and it needs to work in both

User · Answer

The following two cases relate to loading a properties file from an example class named TestLoadProperties.

Case 1: Loading the properties file using ClassLoader

InputStream inputStream = TestLoadProperties.class.getClassLoader()
                          .getResourceAsStream("A.config");
properties.load(inputStream);

In this case the properties file must be in the root/src directory for successful loading.

Case 2: Loading the properties file without using ClassLoader

InputStream inputStream = getClass().getResourceAsStream("A.config");
properties.load(inputStream);

In this case the properties file must be in the same directory as the TestLoadProperties.class file for successful loading.

Note: TestLoadProperties.java and TestLoadProperties.class are two different files. The former, .java file, is usually found in a project's src/ directory, while the latter, .class file, is usually found in its bin/ directory.

User · Answer

I managed to solve this issue with this call  Properties props   PropertiesUtil loadProperties  whatever properties      Extra  you have to put your whatever properties file in  src main resources

User · Answer

To add to Joachim Sauer s answer  if you ever need to do this in a static context  you can do something like the following   static     Properties prop   new Properties      InputStream in   CurrentClassName class getResourceAsStream  foo properties      prop load in     in close        Exception handling elided  as before

User · Answer

To add to Joachim Sauer s answer  if you ever need to do this in a static context  you can do something like the following   static     Properties prop   new Properties      InputStream in   CurrentClassName class getResourceAsStream  foo properties      prop load in     in close        Exception handling elided  as before

User · Answer

public class Test      static       loadProperties         static Properties prop     private static void loadProperties         prop   new Properties        InputStream in   Test class              getResourceAsStream  test properties        try           prop load in           in close          catch  IOException e            e printStackTrace

User · Answer

Nobody mentions the similar but even simpler solution than above with no need to deal with the package of the class  Assuming myfile properties is in the classpath           Properties properties   new Properties            InputStream in   ClassLoader getSystemResourceAsStream  myfile properties            properties load in           in close      Enjoy

User · Answer

Assuming your using the Properties class  via its load method  and I guess you are using the ClassLoader getResourceAsStream to get the input stream     How are you passing in the name  it seems it should be in this form   com al common email templates foo properties

User · Answer

When loading the Properties from a Class in the package com al common email templates you can use  Properties prop   new Properties    InputStream in   getClass   getResourceAsStream  foo properties    prop load in   in close       Add all the necessary exception handling    If your class is not in that package  you need to aquire the InputStream slightly differently   InputStream in     getClass   getResourceAsStream   com al common email templates foo properties      Relative paths  those without a leading      in getResource   getResourceAsStream   mean that the resource will be searched relative to the directory which represents the package the class is in   Using java lang String class getResource  foo txt   would search for the  inexistent  file  java lang String foo txt on the classpath   Using an absolute path  one that starts with      means that the current package is ignored

User · Answer

Nobody mentions the similar but even simpler solution than above with no need to deal with the package of the class  Assuming myfile properties is in the classpath           Properties properties   new Properties            InputStream in   ClassLoader getSystemResourceAsStream  myfile properties            properties load in           in close      Enjoy

User · Answer

Assuming your using the Properties class  via its load method  and I guess you are using the ClassLoader getResourceAsStream to get the input stream     How are you passing in the name  it seems it should be in this form   com al common email templates foo properties

User · Answer

Assuming your using the Properties class  via its load method  and I guess you are using the ClassLoader getResourceAsStream to get the input stream     How are you passing in the name  it seems it should be in this form   com al common email templates foo properties

User · Answer

public class Test      static       loadProperties         static Properties prop     private static void loadProperties         prop   new Properties        InputStream in   Test class              getResourceAsStream  test properties        try           prop load in           in close          catch  IOException e            e printStackTrace

User · Answer

When loading the Properties from a Class in the package com al common email templates you can use  Properties prop   new Properties    InputStream in   getClass   getResourceAsStream  foo properties    prop load in   in close       Add all the necessary exception handling    If your class is not in that package  you need to aquire the InputStream slightly differently   InputStream in     getClass   getResourceAsStream   com al common email templates foo properties      Relative paths  those without a leading      in getResource   getResourceAsStream   mean that the resource will be searched relative to the directory which represents the package the class is in   Using java lang String class getResource  foo txt   would search for the  inexistent  file  java lang String foo txt on the classpath   Using an absolute path  one that starts with      means that the current package is ignored

User · Answer

Assuming your using the Properties class  via its load method  and I guess you are using the ClassLoader getResourceAsStream to get the input stream     How are you passing in the name  it seems it should be in this form   com al common email templates foo properties

User · Answer

When loading the Properties from a Class in the package com al common email templates you can use  Properties prop   new Properties    InputStream in   getClass   getResourceAsStream  foo properties    prop load in   in close       Add all the necessary exception handling    If your class is not in that package  you need to aquire the InputStream slightly differently   InputStream in     getClass   getResourceAsStream   com al common email templates foo properties      Relative paths  those without a leading      in getResource   getResourceAsStream   mean that the resource will be searched relative to the directory which represents the package the class is in   Using java lang String class getResource  foo txt   would search for the  inexistent  file  java lang String foo txt on the classpath   Using an absolute path  one that starts with      means that the current package is ignored

User · Answer

I managed to solve this issue with this call  Properties props   PropertiesUtil loadProperties  whatever properties      Extra  you have to put your whatever properties file in  src main resources

User · Answer

use the below code please            Properties p   new Properties         StringBuffer path   new StringBuffer  com al common email templates         path append  foo properties        InputStream fs   getClass   getClassLoader                                        getResourceAsStream path toString      if fs    null        System err println  Unable to load the properties file        else     try         p load fs           catch  IOException e            e printStackTrace

User · Answer

use the below code please            Properties p   new Properties         StringBuffer path   new StringBuffer  com al common email templates         path append  foo properties        InputStream fs   getClass   getClassLoader                                        getResourceAsStream path toString      if fs    null        System err println  Unable to load the properties file        else     try         p load fs           catch  IOException e            e printStackTrace

User · Answer

public class ReadPropertyDemo       public static void main String   args            Properties properties   new Properties             try               properties load new FileInputStream                       com technicalkeeda demo application properties                 System out println  Domain  -     properties getProperty  domain                 System out println  Website Age  -                         properties getProperty  website age                 System out println  Founder  -     properties getProperty  founder                     Display all the values in the form of key value             for  String key   properties stringPropertyNames                      String value   properties getProperty key                   System out println  Key -     key    Value -     value                            catch  IOException e                System out println  Exception Occurred    e getMessage

User · Answer

When loading the Properties from a Class in the package com al common email templates you can use  Properties prop   new Properties    InputStream in   getClass   getResourceAsStream  foo properties    prop load in   in close       Add all the necessary exception handling    If your class is not in that package  you need to aquire the InputStream slightly differently   InputStream in     getClass   getResourceAsStream   com al common email templates foo properties      Relative paths  those without a leading      in getResource   getResourceAsStream   mean that the resource will be searched relative to the directory which represents the package the class is in   Using java lang String class getResource  foo txt   would search for the  inexistent  file  java lang String foo txt on the classpath   Using an absolute path  one that starts with      means that the current package is ignored

User · Answer

The following two cases relate to loading a properties file from an example class named TestLoadProperties.

Case 1: Loading the properties file using ClassLoader

InputStream inputStream = TestLoadProperties.class.getClassLoader()
                          .getResourceAsStream("A.config");
properties.load(inputStream);

In this case the properties file must be in the root/src directory for successful loading.

Case 2: Loading the properties file without using ClassLoader

InputStream inputStream = getClass().getResourceAsStream("A.config");
properties.load(inputStream);

In this case the properties file must be in the same directory as the TestLoadProperties.class file for successful loading.

Note: TestLoadProperties.java and TestLoadProperties.class are two different files. The former, .java file, is usually found in a project's src/ directory, while the latter, .class file, is usually found in its bin/ directory.

User · Answer

public class ReadPropertyDemo       public static void main String   args            Properties properties   new Properties             try               properties load new FileInputStream                       com technicalkeeda demo application properties                 System out println  Domain  -     properties getProperty  domain                 System out println  Website Age  -                         properties getProperty  website age                 System out println  Founder  -     properties getProperty  founder                     Display all the values in the form of key value             for  String key   properties stringPropertyNames                      String value   properties getProperty key                   System out println  Key -     key    Value -     value                            catch  IOException e                System out println  Exception Occurred    e getMessage

[java] Loading a properties file from Java package

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