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通过该对象可以在一个请求中传递数据,作用范围:在一次请求中有效,即服务器跳转有效。
package com.mage.hsr;
/*
* request域对象
* */
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Test03 extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setAttribute("uname","qwe");
//使用域对象前必须先使用set设置内容
Object uname2 = req.getAttribute("uname");
//通过键名,得到值
System.out.println(uname2);
req.getRequestDispatcher("hsr04").forward(req,resp);
//请求转发,将req对象,转发给其他页面(Test04)
req.removeAttribute("uname");
//移除uname域对象
System.out.println(uname2);
}
}
public class Test04 extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("hello"+req.getAttribute("uname"));
//输出Test03请求转发过来的域对象内容
}
}