J2EE 第2次课笔记--Servlet

领测软件测试网 这次课讲了一些servlet一些基础的知识!

1.在本地访问servlet(以tomcat服务器为例):

http://locatlhost:8080/servlet/你的servlet的名字

这样你就可以直接访问这个servlet了!



2.使用jcreator进行servlet的程序编写时,需要导入tomcat下,common/lib/servlet.jar

才能调用servlet包


3.测试程序,还是从最简单的Hello,World!来进行练习吧!

代码:

import javax.servlet.*;
import java.io.*;
public class HelloServlet extends GenericServlet
{
//需要重载初象类service
public void service(ServletRequest request,ServletResponse response) throws IOExcetpion
{
PrintWriter out = response.getWriter();
out.println("Hello,this is our world!");
}
}



4.HttpServlet继承了GenericServlet,HttpServletRequest/HttpServletResponse继承ServletRequest/ServletResponse

方法getHeader是得到表头信息

request.getHeader(“connection“) 得到连接信息

request.getHeader(“User-Agent“) 得到用户信息

例子:

import javax.servlet.*;
import java.io.*;
import javax.servlet.http.*; //必须导入这个包,才能使用HttpServlet

public class HelloServlet extends HttpServlet
{
//需要重载初象类service
public void service(HttpServletRequest request,HttpServletResponse response) throws IOExcetpion
{
PrintWriter out = response.getWriter();
String s = request.getHeader("Connection");
String user = request.getHeader("User-Agent");
out.println("you connect to server is"+s);
out.close();
}
}


5.response.setContentType("text/html;charset=gb2312")

文章来源于领测软件测试网 https://www.ltesting.net/