读取配置文件的若干种方法总结_loadconfigfile-优快云博客

本文链接：https://blog.youkuaiyun.com/vampirehgg/article/details/50737534

本文展示了一个使用Java实现的从.properties文件加载配置信息的方法，包括构造方法直接加载和自定义加载方法。

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import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class LoadConfigFile {
    private static String ipString;

    private static String portstring;

    private static String datanameString;

    /**
     * 直接在构造方法中读取
     */
    public LoadConfigFile() {
        String fileName = "db.properties";// 直接写文件名
        Properties properties = new Properties();
        try {
            InputStream in = this.getClass().getClassLoader().getResourceAsStream(fileName);
            properties.load(in);
            in.close();
            if (properties.containsKey("ipstr")) {
                ipString = properties.getProperty("ipstr");
                System.out.println(ipString);
            }
            if (properties.containsKey("portstr")) {
                portstring = properties.getProperty("portstr");
                System.out.println(portstring);
            }
            if (properties.containsKey("dataname")) {
                datanameString = properties.getProperty("dataname");
                System.out.println(datanameString);
            }
        }
        catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 自定义加载配置文件方法
     */
    public static void loadConfig() {
        String fileName = "/db.properties";// 文件名前面加上"/"
        Properties properties = new Properties();
        try {
            InputStream in = LoadConfigFile.class.getResourceAsStream(fileName);
            properties.load(in);
            in.close();
            if (properties.containsKey("ipstr")) {
                ipString = properties.getProperty("ipstr");
                System.out.println(ipString);
            }
            if (properties.containsKey("portstr")) {
                portstring = properties.getProperty("portstr");
                System.out.println(portstring);
            }
            if (properties.containsKey("dataname")) {
                datanameString = properties.getProperty("dataname");
                System.out.println(datanameString);
            }
        }
        catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        // loadConfig();
        new LoadConfigFile();
    }
}