今天在理解工廠模式時出現了一個錯誤:
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.qyy.factory.UserAction.main(UserAction.java:11)
Caused by: java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Properties.java:418)
at java.util.Properties.load0(Properties.java:337)
at java.util.Properties.load(Properties.java:325)
at com.qyy.factory.getBean.<clinit>(getBean.java:16)
... 1 more
原因:讀取配置文件內容時,其中的配置文件的全限定名寫錯,這類名字或路徑最好複製全限定名,儘量不要手寫,不要過分相信不會出錯,哈哈
//讀取配置文件內容
private static Properties pro = new Properties();
static{
//小括號的名字書寫錯誤
InputStream is = getBean.class.getResourceAsStream("/com/qyy/beas.properties");
try {
pro.load(is);
} catch (IOException e) {
e.printStackTrace();
}
}