java學習1.2-創建Servlet及JSP

1.eclipse創建java動態工程

2.創建Servlet

ServletDemo及其url配置：

package com.zyf.servlet;
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;
// 訪問：http://localhost:8080/servlet-learn/servletdemo
//@WebServlet(description = "servlet學習1", urlPatterns = { "/servletdemo" }) // url匹配放在web.xml中
public class ServletDemo extends HttpServlet {
	private static final long serialVersionUID = 1L;       
    public ServletDemo() {
        super();
    }
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.getWriter().append("Served at: ").append(request.getContextPath());
		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out.println("...I am ServletDemo");
	}
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doGet(request, response);
	}
}

url配置在web.xml中：

<servlet>
	<!-- servlet名 -->
	<servlet-name>ServletDemo</servlet-name>
	<!-- 所在的包和類 -->
	<servlet-class>com.zyf.servlet.ServletDemo</servlet-class>
</servlet>
<servlet-mapping>
	<servlet-name>ServletDemo</servlet-name>
	<!-- 訪問的url -->
	<url-pattern>/servletdemo</url-pattern>
</servlet-mapping>

ServletDemo2，其url用註解配置：

// 訪問：http://localhost:8080/servlet-learn/servletdemo2
@WebServlet(description = "servlet學習2", urlPatterns = { "/servletdemo2" })
public class ServletDemo2 extends HttpServlet {
	private static final long serialVersionUID = 1L;
	public ServletDemo2() {
		super();
	}
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		PrintWriter out = response.getWriter();
		out.println(" I am ServlerDemo2");
	}
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}
}

3.測試servlet

啓動tomcat，訪問http://localhost:8080/servlet-learn/servletdemo

訪問 http://localhost:8080/servlet-learn/servletdemo2

4.JSP簡介

JSP：全稱JavaServerPages。JSP部署於網絡服務器上，可以響應客戶端發送的請求，並根據請求內容動態地生成HTML、XML或其他格式文檔的Web網頁，然後返回給請求者。

JSP編譯器可以把JSP文件編譯成Servlet，jsp本質上就是servlet。

5.創建jsp

創建：\WebContent\jsp1.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
    out.println("Hello World jsp!");
%>
</body>
</html>