源代码路径：https://git.oschina.net/kxtry/servletwaycreate
以下是基于servlet3.0API而创建的。
0.pom.xml的准备
javax.servlet
javax.servlet-api
3.0.1
1.ServletContainerInitializer的方式。
在resources/META-INF/services/javax.servlet.ServletContainerInitializer文件中增加以下内容。
HandlerInitializer，如果是有包名，则需要添加上包名如hello.HandlerInitializer
public class ServletManualReg extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.getWriter().print("ServletManualReg.hello");
}
}
import javax.servlet.ServletContainerInitializer;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;
import javax.servlet.annotation.HandlesTypes;
import java.util.Set;
@HandlesTypes({HandlerInitializer.class})
public class HandlerInitializer implements ServletContainerInitializer {
public void onStartup(Set> c, ServletContext servletContext)
throws ServletException {
System.out.println("onStartup");
ServletRegistration registration = servletContext.addServlet("ServletManualReg", "hello.ServletManualReg");
registration.addMapping("/manual_reg");
System.out.println("leaving onStartup");
}
}
2.使用ServletContextListener注册
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class DynRegServlet extends HttpServlet {
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.getWriter().print("DynRegServlet.hello");
}
}
import javax.servlet.*;
import javax.servlet.annotation.WebListener;
@WebListener
public class DynRegListener implements ServletContextListener {
public void contextDestroyed(ServletContextEvent arg0) {
}
public void contextInitialized(ServletContextEvent sce) {
ServletContext servletContext = sce.getServletContext() ;
Servlet dynRegServlet = null ;
try {
dynRegServlet = servletContext.createServlet(DynRegServlet.class) ;
} catch (ServletException e) {
e.printStackTrace();
}
ServletRegistration.Dynamic dynamic = servletContext.addServlet("DynRegServlet", dynRegServlet) ;
dynamic.addMapping("/dynamic_reg") ;
}
}
3.使用WebServlet注解注册
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* 使用＠WebServlet实现了，自动注册。
*/
@WebServlet(name = "ServletNotationReg", urlPatterns = "/notation_reg")
public class ServletNotationReg extends HttpServlet {
public ServletNotationReg(){
int i = 0;
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.getWriter().print("ServletNotationReg.hello");
}
}
