servlet hello world

Tomcat安装在D:\Tomcat55

 

1:在D:\Tomcat55\webapps\ROOT\WEB-INF目录下创建classes目录

 

2:编写servlet类(放在上面的classes目录下)
    import java.io.*;
    import javax.servlet.*;
    import javax.servlet.http.*;
   
    public class HelloWorld extends HttpServlet {
   
        public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws IOException, ServletException
        {
            response.setContentType("text/html");
            PrintWriter out = response.getWriter();
            out.println("");
            out.println("");
            out.println("");
            out.println("");
            out.println("");
            out.println("

Hello World!

");
            out.println(" ");
            out.println("");
        }
    }

 

3:把servlet库添加到环境变量
    set CLASSPATH=D:\Tomcat55\common\lib\servlet-api.jar;%CLASSPATH%

 

4:编译servlet类
    javac HelloWorld.java

 

5:修改web.xml文件，增加以下内容
       
            HelloWorld
            HelloWorld
       
   
       
            HelloWorld
            /HelloWorld
       

 

6:重启tomcat

 

7:浏览器输入就能看到输出