两种在web项目中获取读取文件的路径的方法_webopenlocalfile打开文档的路径-优快云博客

本文介绍了一种在Java Web应用中读取配置文件的方法。通过使用servlet上下文的getRealPath方法和getResourceAsStream方法，可以有效地从Web项目的WEB-INF目录中加载db.properties文件，并从中读取属性设置。

package day11.lwb.b_resource;

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

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ResourceDemo extends HttpServlet {
/**
*读取web应用下的资源文件
*例如 properties
*路径：web项目下： /day11/WebRoot/WEB-INF/db.properties
*
*特别注意：web项目中最好不要用相对路径”.”，它表示的路径只在tomcat服务器的bin目录下
*下面演示了两种在web项目中获取读取文件的路径的方法
*/

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

    response.setContentType("text/html;charset=utf-8");

    Properties prop = null;
    try {

// prop = getResource1();
prop = getResource2();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

    String user = prop.getProperty("user");
    String password = prop.getProperty("password");
    System.out.println("user = "+user);
    System.out.println("password = "+password);
}
**//方法1：getRealPath方法**
private Properties getResource1() throws Exception {
    String path = this.getServletContext().getRealPath("/WEB-INF/db.properties");
    System.out.println(path);
    File file = new File(path);
    FileInputStream in = new FileInputStream(file);
    Properties prop = new Properties();
    prop.load(in);
    return prop;
}
**//方法2：getResourceAsStream方法**
private Properties getResource2() throws Exception {
    InputStream in = this.getServletContext().getResourceAsStream("/WEB-INF/db.properties");
    Properties prop = new Properties();
    prop.load(in);
    return prop;
}

}