手动编写一个servlet部署在tomcat上

先编写一个简单的HelloWorld.java

package com.amarsoft.exercise;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;

public class HelloWorld extends HttpServlet{

public void service(ServletRequest req, ServletResponse resp)
        throws ServletException, IOException {
    PrintWriter out = resp.getWriter();
    out.println("<html>");
        out.println("<head>");
            out.println("<title>");
                out.println("Java Servlet");
            out.println("</title>");
        out.println("</head>");
            out.println("<body>");
                out.println("helloworld");
            out.println("</body>");
    out.println("</html>");
}
}