java - 无法读取java中的配置值(null返回的不是值)

Question

我一直在开发一个游戏(我的第一个游戏之一^^)，但在导入属性时遇到了问题。下面我发布了所有相关文件和我遇到的问题 - 如果有人知道我去了哪里以及我可以修复它，我将非常感激:)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~ 这是我的主类(目前仅用于测试)

package game;

public class Main {

    //Setup
    static Settings settings = null;

    public static void main(String args[]){
        System.out.println("Main Started");

        settings = new Settings();
        String test = settings.getProperty("test");
        String hello = settings.getProperty("hello");

        System.out.println("Test: " + test);
        System.out.println("Hello: " + hello);
    }

}

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~

这是调用时加载设置的设置类。

package game;

//Imports
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.IOException;
import java.util.Properties;

public class Settings {
    Properties config = new Properties();
    InputStream input = getClass().getClassLoader().getResourceAsStream("config.properties");

    public Settings(){
        System.out.println();

    }

    public String getProperty(String key){
        String value = config.getProperty(key);
        return value;
    }

    public int getValue(String key){
        int value = Integer.parseInt(config.getProperty(key));
        return value;
    }

    public void close(){
        try {
            input.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~

这是属性文件(.properties)

#Test Strings
test = "this is a test"
hello = "Hello, World."

#Resolution Settings
width = 800
height = 600
scale = 1

#Cars
speed = 1
cars = 1

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~

这是控制台，返回null

Main Started

Test: null
Hello: null

感谢您的阅读!我希望你能帮忙:)

Answer 1

在初始化 Settings 对象时，您应该为 config 和 input 正确加载资源，例如:

public class Settings { 

    Properties config = new Properties();
    InputStream input = null;

    public Settings(){
        input = getClass().getClassLoader().getResourceAsStream("config.properties");
        // or use input = new FileInputStream("config.properties");
        config.load(input)
    }

    .... // other of your functions
 }

而且我认为，属性的文件名应该成为一个参数，以增强Settings类的灵 active ，例如:

public Settings(String filename){
    input = getClass().getClassLoader().getResourceAsStream(filename);
    // or use input = new FileInputStream(filename)
    config.load(input)
}

并在主要部分:

public static void main(String args[]){
    System.out.println("Main Started");

    settings = new Settings("config.properties");
    String test = settings.getProperty("test");
    String hello = settings.getProperty("hello");

    // say you have another properties named config2.properties to read
    Settings another_settings = new Settings("config2.properties");
    String xxx = settings.getProperty("xxx");
    String yyy = settings.getProperty("yyy");
}