IntelliJ IDEA 14.03 运行servlet前怎样设置web.xml

没有配置好 IntelliJ IDEA 14.03 + Tomcat 的同学先看这篇文章:

IntelliJ IDEA 14.x 与 Tomcat 集成,创建并运行Java Web项目

首先按照上文所讲正确配置 IntelliJ IDEA 14.03 + Tomcat,配置好以后新建的项目结构如图所示:

Image5_thumb3

(没有运行过的class文件夹是空的,运行过后class文件夹里面才会有.class文件)

自动建立的web.xml文件如图:

Image8_thumb2

在<web-app>标签中插入<servlet>标签、<servlet-mapping>标签,如图:

Image11_thumb2 
代码:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
    <servlet>
        <servlet-name>Servlet</servlet-name>
        <servlet-class>Servlet.MyServlet</servlet-class> //<servlet-class>中的内容是固定的,必须是"Servlet所在包的名称.Servlet类的名称"
    </servlet>
    <servlet-mapping>
        <servlet-name>Servlet</servlet-name>
        <url-pattern>/Servlet/MyServlet</url-pattern>
    </servlet-mapping>
</web-app>

新建的四个标签中servlet-class标签的内容是固定的,不能随意修改

servlet-name标签中的内容自定,但两个servlet-name标签中的内容必须相同

url-pattern标签中的内容自定,如例子中url-pattern为 /Servlet/MyServlet ,tomcat端口(默认)为8080,

则启动项目后,在浏览器中输入http://localhost:8080/Servlet/MyServlet,即可访问到servlet所定义的页面

注:

1.

url-pattern可定义多个,可以使不同的url指向同一页面:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
    <servlet>
        <servlet-name>Servlet</servlet-name>
        <servlet-class>Servlet.MyServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>Servlet</servlet-name>
        <url-pattern>/Servlet/MyServlet</url-pattern>
        <url-pattern>/A</url-pattern>
    </servlet-mapping>
</web-app>

则在浏览器地址栏输入http://localhost:8080/A 可以跳转到相同的页面

2.

一个最简单的servlet类(未定义编码方式):

package Servlet;

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;
import java.io.PrintWriter;

/**
 * Created by Administrator on 2015/3/22.
 */
@WebServlet(name = "MyServlet")
public class MyServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        PrintWriter out=response.getWriter(); //准备输出
        out.println("<html>");
        out.println("<head><title>JAVA WEB</title></head>");
        out.println("<body>");
        out.println("<h1>Hello World</h1>");
        out.println("</body>");
        out.println("</html>");
        out.close();//关闭输出
    }
}
posted @ 2015-03-23 18:31  蒙面  阅读(15614)  评论(1编辑  收藏  举报