1. 访问 WebContent 目录下的 JSP 文件
在 WebContent 目录下的文件可以直接在浏览器中访问。新建一个 test.jsp 文件
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<% int value = 100; %>
<h1>value is <%= value %></h1>
</body>
</html>
访问结果：
2. 访问 Servlet 需要配置 web.xml
新建一个类并继承 HttpServlet 或直接新建一个 Servlet
package indi.tracine.servlet.test; import java.io.IOException;
import java.io.PrintWriter; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; public class TestServlet extends HttpServlet {
private static final long serialVersionUID = 1L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html; charset=UTF-8");
PrintWriter out = response.getWriter();
out.print("This is TestServlet");
} protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//doGet(req, resp);
}
}
在 web.xml 中配置该 Servlet 的 <servlet> 节点和 </servlet-mapping> 节点
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<display-name>jee-proj</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>TestServlet</servlet-name>
<servlet-class>indi.tracine.servlet.test.TestServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>TestServlet</servlet-name>
<url-pattern>/test</url-pattern>
</servlet-mapping>
</web-app>
访问结果：
3. 访问 WEB-INF 目录下的 JSP 文件
WEB-INF是一个安全目录，客户端请求是无法访问该目录了下的文件，需要配置 web.xm l或利用 Servlet 跳转到该 jsp 文件
方法 1). 在 web.xm l中配置 WEB-INF 目录下的 jsp（output.jsp） 文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<display-name>jee-proj</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>output</servlet-name>
<jsp-file>/WEB-INF/output.jsp</jsp-file>
</servlet>
<servlet-mapping>
<servlet-name>output</servlet-name>
<url-pattern>/output</url-pattern>
</servlet-mapping>
</web-app>
方法 2). 访问某个 Servlet，在 Servlet 内部转发到 jsp（output.jsp）文件（不是重定向）
package indi.tracine.servlet.test; import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; public class OutputServlet extends HttpServlet {
private static final long serialVersionUID = 1L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.getRequestDispatcher("/WEB-INF/output.jsp").forward(request,response);
} protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//doGet(req, resp);
}
}