Java - basic - read the resource file

1, src / main / java files compiled under question

Maven configuration is required, otherwise the configuration files in src / main / java will not be compiled.

<resources>
    <resource>
        <directory>src/main/java</directory>
        <includes>
            <include>**/*.txt</include>
        </includes>
    </resource>
</resources>

2, read the file: getResource

//相对路径
//file.txt 在当前代码类的相对路径下去找
//如：D:/work/blog-test/target/classes/com/vim/test/file.txt
String path = this.getClass().getResource("file.txt").getPath();


//绝对路径
//file.txt 在当前 classpath 下已绝对路径去找
//如：D:/work/blog-test/target/classes/txt/file.txt
String path = this.getClass().getResource("/txt/file.txt").getPath();

3, read the file: spring of ClassPathResource

//此处全部是相对于 classpath 路径的
ClassPathResource resource = new ClassPathResource("templates/file-resource2.txt");

4, read the properties file: Classpath based

public void test001() throws Exception{
    InputStream in = this.getClass().getResourceAsStream("/test.properties");

    Properties properties = new Properties();
    properties.load(in);
    System.out.println(properties.getProperty("user"));
}

5, reads the properties file: Use ResourceBundle

public void test001() throws Exception{
    ResourceBundle resource = ResourceBundle.getBundle("test");
    System.out.println(resource.getString("user"));
}

public void test001() throws Exception{
    InputStream in = this.getClass().getResourceAsStream("/test.properties");

    ResourceBundle resource = new PropertyResourceBundle(in);
    System.out.println(resource.getString("user"));
}