servlet作用域
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1.作用域(servlet四个作用域中的两个):
request作用域--请求域:
作用范围:只在一次请求中有效;
语句:request.setAttribute(arg0, arg1);
例子:
package com.yy.torday;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.omg.CORBA.Request;
public class Sertext extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
request.setAttribute("username", username);
request.setAttribute("password", password);
request.getRequestDispatcher("/chenggong.jsp").forward(request, response);
return;
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
session作用域--会话域:
作用范围:在默认的session有效期30分钟内有效;
语句:
首先需要获得session代码;
HttpSession session = request.getSession();
session.setAttribute(arg0, arg1);
例子:
package com.yy.torday;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.omg.CORBA.Request;
public class Sertext extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
HttpSession session = request.getSession();
session.setAttribute("session_username", session.getId());
session.setAttribute("session_password", password);
request.getRequestDispatcher("/chenggong.jsp").forward(request, response);
return;
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
request作用域--请求域:
作用范围:只在一次请求中有效;
语句:request.setAttribute(arg0, arg1);
例子:
package com.yy.torday;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.omg.CORBA.Request;
public class Sertext extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
request.setAttribute("username", username);
request.setAttribute("password", password);
request.getRequestDispatcher("/chenggong.jsp").forward(request, response);
return;
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
session作用域--会话域:
作用范围:在默认的session有效期30分钟内有效;
语句:
首先需要获得session代码;
HttpSession session = request.getSession();
session.setAttribute(arg0, arg1);
例子:
package com.yy.torday;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.omg.CORBA.Request;
public class Sertext extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
HttpSession session = request.getSession();
session.setAttribute("session_username", session.getId());
session.setAttribute("session_password", password);
request.getRequestDispatcher("/chenggong.jsp").forward(request, response);
return;
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
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