用ServletContext对象读取javaweb项目的资源文件

素颜马尾好姑娘i 2022-03-21 09:56 198阅读 0赞

### 文章目录 ###

*   *   *   *  一、项目结构
             *  二、dbinfo.properties
             *  三、ServletDb.java
             *  四、部署项目，访问浏览器
             *  五、运行结果

#### 一、项目结构 ####

![在这里插入图片描述][20190201000245702.]

#### 二、dbinfo.properties ####

#数据库
    url=jdbc:mysql://localhost:3306
    #用户名
    username=username1
    #密码
    password=passworde1

#### 三、ServletDb.java ####

package net.test.servlet;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.Properties;
    
    @WebServlet(name = "ServletDb",urlPatterns = "/db")
    public class ServletDb extends HttpServlet {
        @Override
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
        }
        @Override
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            //用ServletContext对象获取资源流
            InputStream resourceAsStream = this.getServletContext().getResourceAsStream("/dbinfo.properties");
            //创建属性对象，将资源流放入属性对象
            Properties properties = new Properties();
            properties.load(resourceAsStream);
            //获取属性值
            String url = properties.getProperty("url");
            String username = properties.getProperty("username");
            String password = properties.getProperty("password");
            //输出到控制台
            System.out.println("url="+url);
            System.out.println("username="+username);
            System.out.println("password="+password);
        }
    }

#### 四、部署项目，访问浏览器 ####

![在这里插入图片描述][20190201000420835.]

#### 五、运行结果 ####

![在这里插入图片描述][20190201000559311.]

[20190201000245702.]: /images/20220321/db7de90382e74f1da9d547e74e68f0a7.png
[20190201000420835.]: /images/20220321/72c36712ddb54cab9be274767c2ab010.png
[20190201000559311.]: /images/20220321/7197db609d5f40dba098cb1aed51a788.png