這次課講了一些servlet一些基礎的知識!
1.在本地訪問servlet(以tomcat服務器為例):
http://locatlhost:8080/servlet/你的servlet的名字
這樣你就可以直接訪問這個servlet了!
2.使用jcreator進行servlet的程序編寫時,需要導入tomcat下,common/lib/servlet.jar
才能調用servlet包
3.測試程序,還是從最簡單的Hello,World!來進行練習吧!
代碼:
import javax.servlet.*;
import java.io.*;
public class HelloServlet extends GenericServlet
{
//需要重載初象類service
public void service(ServletRequest request,ServletResponse response) throws IOExcetpion
{
PrintWriter out = response.getWriter();
out.println("Hello,this is our world!");
}
}
4.HttpServlet繼承了GenericServlet,HttpServletRequest/HttpServletResponse繼承ServletRequest/ServletResponse
方法getHeader是得到表頭信息
request.getHeader(「connection「) 得到連接信息
request.getHeader(「User-Agent「) 得到用戶信息
例子:
import javax.servlet.*;
import java.io.*;
import javax.servlet.http.*; //必須導入這個包,才能使用HttpServlet
public class HelloServlet extends HttpServlet
{
//需要重載初象類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")
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