如何从 POJO 的 meta-inf 文件夹中读取属性文件

Question

如何从普通 Java 类的 Web 应用程序中的 meta-inf 文件夹中读取属性文件。

Answer 1

您可以做的最简单的事情是：-

InputStream propertiesIs = this.getClass().getClassLoader().getResourceAsStream("META-INF/your.properties");
Properties prop = new Properties();
prop.load(propertiesIs);
System.out.println(prop.getProperty(YourPropertyHere));

或者

您也可以尝试使用FileInputStream加载您的属性：-

input = new FileInputStream("META-INF/your.properties");

Answer 2

阅读资源时，应注意正确关闭它们。

    InputStream streamOrNull = getClass().getClassLoader().getResourceAsStream(
            "META-INF/your.properties");
    if (streamOrNull == null) {
        // handle no such file
    }
    else {
        try (InputStream stream = streamOrNull) { // close stream eventually
            Properties properties = new Properties();
            properties.load(stream);
            // access properties
        }
    }

Answer 3

package net.bounceme.doge.json;

import java.io.IOException;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;

public class PropertiesReader {

    private static final long serialVersionUID = 1L;
    private static final Logger log = Logger.getLogger(PropertiesReader.class.getName());

    public Properties tryGetProps(String propertiesFileName) {
        log.fine(propertiesFileName);
        Properties properties = new Properties();
        try {
            properties = getProps(propertiesFileName);
        } catch (IOException ex) {
            Logger.getLogger(PropertiesReader.class.getName()).log(Level.SEVERE, null, ex);
        }
        log.info(properties.toString());
        return properties;
    }

    private Properties getProps(String propertiesFileName) throws IOException {
        log.fine(propertiesFileName);
        Properties properties = new Properties();
        properties.load(PropertiesReader.class.getResourceAsStream("/META-INF/" + propertiesFileName + ".properties"));
        log.fine(properties.toString());
        return properties;
    }
}

这个工作对我来说。