从头写java文件的方式，编译成CLASS文件，加强对SERVLET容器的理解。
稍后试试JAR和WAR包。
文件内容（跟以前用IDE的一样）：
HelloServlet.java:
package cc.openhome;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class HelloServlet
*/
@WebServlet(urlPatterns = {"/hello.view"})
public class HelloServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public HelloServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String name = request.getParameter("name");
out.println("<html>");
out.println("<head>");
out.println("<title>Hello</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1> Hello!" + name + "! </h1>");
out.println("</body>");
out.println("</html>");
out.close();
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
web.xml(这个文件可有可无的，在用servlet3.0注解的情况下，当里，用了注解，也可以定义另一个URL):
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<servlet>
<servlet-name>firstServlet</servlet-name>
<servlet-class>cc.openhome.HelloServlet</servlet-class>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>firstServlet</servlet-name>
<url-pattern>/first.do</url-pattern>
</servlet-mapping>
</web-app>
注意目录的摆放：
。HelloServlet.java文件位于C:\apache-tomcat-8.0.30\webapps\First\WEB-INF\classes目录下。 。编译命令为： 。C:\apache-tomcat-8.0.30\webapps\First\WEB-INF\classes>javac -cp .;C:\apache-tomcat-8.0.30\lib\servlet-api.jar -d . HelloServlet.java 。生成的HelloServlet.class文件位于：C:\apache-tomcat-8.0.30\webapps\First\WEB-INF\classes\cc\openhome目录下。 。web.xml当然位于C:\apache-tomcat-8.0.30\webapps\First\WEB-INF目录下。
于是用
http://127.0.0.1:8080/First/first.do?name=hello
http://127.0.0.1:8080/First/hello.view?name=hello
都会指定到同一个servlet.
时间： 2024-09-18 21:46:53