第一種方法

    `import java.io.FileInputStream;

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

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;

public class Emaldome4 extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

       ServletContext context = this.getServletContext();   
       InputStream is = context.getResourceAsStream("/res/config.properties");
       Properties props = new Properties();
       props.load(is);
       System.out.println(props.getProperty("email"));

}
 

}`

訪問：
http://localhost:8080/day04/Emaldome4

結果：

第二種方法：

類加載器只能加載IDE工具下src目錄下的資源文件，其它目錄無法加載
此時/表示:/WEB-INF/classes/目錄

           //通過類加載器加載src/config.properteis資源文件
           //取得當前對象的字節碼對象
            Class clazz =   this.getClass();
            //取得當前對象的類加載器
            ClassLoader cl =  clazz.getClassLoader();

            //
            InputStream is =  cl.getResourceAsStream("/cn/config/config.properties");

            Properties props = new Properties();
            props.load(is);
            System.out.println(props.getProperty("email"));
 

ServletContex獲取文件內容路徑學習筆記