java 如何將代碼中的常量寫成properties配置文件

在有些時候，在代碼中定義常量，不便於更改。所以這裏寫一點個人竅門。

原本是這樣的：

String nodeUrl ="123";
String pkiId = "456";
String senderId = "789";
String serviceId = "124";
String zdyhGmsfhm = "125";
String zdyhXm = "126";
String zdyhDwbm = "127";
String zdyhDwmc = "128";
String zdyhJh = "129";
String xtmc = "130";
String zdyhIp = "131";
String zdyhMac = "132";

改成

		String nodeUrl =PropertyReader.getProperty("nodeUrl");
 		String pkiId =PropertyReader.getProperty("pkiId"); 
		String senderId = PropertyReader.getProperty("senderId");
		String serviceId = PropertyReader.getProperty("serviceId711");
		String zdyhGmsfhm = PropertyReader.getProperty("zdyhGmsfhm"); 
		String zdyhXm = PropertyReader.getProperty("zdyhXm");
		String zdyhDwbm =PropertyReader.getProperty("zdyhDwbm");
		String zdyhDwmc =PropertyReader.getProperty("zdyhDwmc");
		String zdyhJh = PropertyReader.getProperty("zdyhJh");
		String xtmc = PropertyReader.getProperty("xtmc");
		String zdyhIp = PropertyReader.getProperty("zdyhIp");
		String zdyhMac = PropertyReader.getProperty("zdyhMac");

propertie文件：

nodeUrl =123
pkiId =456
senderId =789
serviceId707=124
zdyhGmsfhm =125
zdyhXm =126
zdyhDwbm =127
zdyhDwmc =128
zdyhJh =129
xtmc =130
zdyhIp =131
zdyhMac =132

這裏有一點要注意，創建properties文件時不能選錯了文件格式，還有，properties中不需要雙引號把=號後面的括起來。

讀取配置文件的代碼是這樣的：

public static PropertyReader pc = new PropertyReader();
	public Properties properties = null;

	private PropertyReader() {
		this.loadConfig();
	}

	public static PropertyReader getInstance() {
		if (pc == null)
			pc = new PropertyReader();
		return pc;
	}

	public static String getProperty(String name) {

		return pc.properties.getProperty(name);
	}

	public void loadConfig() {
		try {
			properties = new Properties();
			//System.out.println(getClass().getResourceAsStream("/src/system.properties"));//這個地方是properties的路勁，相對路徑就好
			properties.load(new InputStreamReader(PropertyReader.class.getClassLoader().getResourceAsStream("resources/system.properties"),"GBK"));
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

如有錯漏，請大佬評論留言，以便及時更改。