03.ServletContext的getRealPath

 

 

临时路径==========>>>>  找文件要从类的classes路径去找

 

 

 

==========》web项目打成war包丢进tomcat的webapps文件夹内，启动tomcat后会自动解压包。

 

 

 

 

 

package com.ivan.web;

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

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/RealPath")
public class RealPath extends HttpServlet{
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // TODO Auto-generated method stub
        
        //解决乱码问题
        resp.setContentType("text/html");
        resp.setCharacterEncoding("utf-8");
        
        ServletContext context = this.getServletContext();
        String path = context.getRealPath("WEB-INF/classes/com/ivan/web/info.properties");
        Properties pro = new Properties();
        pro.load(new FileInputStream(path));
        String username = pro.getProperty("username");
        System.out.println(path);
        System.out.println("----------");
        System.out.println(username);
        
        //响应客户端
        resp.getWriter().write(path);
        resp.getWriter().write("----");
        resp.getWriter().write(username);
    }
}