标签:功能 resp req ServletContext import 服务器 servlet javax
-
域对象:共享数据
- setAttribute(String name,Object value)
- getAttribute(String name)
- removeAttribute(String name)
-
ServletContext对象范围:所有用户所有请求的数据
package com.ailyt.servletContext;
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;
import java.io.IOException;
@WebServlet("/scs3")
public class ServletContextStudy03 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
/**
* ServletContext功能:
* 域对象:共享数据
* 获取文件真实(服务器)路径
*/
//通过request对象获取
ServletContext context1 = req.getSession().getServletContext();
//获取数据
Object msg = context1.getAttribute("msg");
System.out.println(msg);
}
}
package com.ailyt.servletContext;
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;
import java.io.IOException;
@WebServlet("/scs3")
public class ServletContextStudy04 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
/**
* ServletContext功能:
* 域对象:共享数据
* 获取文件真实(服务器)路径
*/
//通过request对象获取
ServletContext context1 = req.getSession().getServletContext();
//设置数据
context1.setAttribute("msg","hahhaha");
}
}
- 获取文件的真实(服务器)路径
- 方法:String getRealPath(String path);
package com.ailyt.servletContext;
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;
import java.io.File;
import java.io.IOException;
@WebServlet("/scs5")
public class ServletContextStudy05 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
/**
* ServletContext功能:
* 域对象:共享数据
* 获取文件真实(服务器)路径
*/
//通过request对象获取
ServletContext context1 = req.getSession().getServletContext();
//获取文件的服务器路径
String realPath = context1.getRealPath("/b.txt");
File file = new File(realPath);
}
}
标签:功能,resp,req,ServletContext,import,服务器,servlet,javax 来源: https://www.cnblogs.com/ailhy/p/16574991.html
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