Servlet—HelloWorld

怼烎@ 2022-07-14 02:58 119阅读 0赞

package Excise;
    
    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;
    
    //继承类HttpServlet
    public class HelloWorld extends HttpServlet {
    	// 处理客户端的Get请求
    	public void doGet(HttpServletRequest request, HttpServletResponse response)
    			throws ServletException, IOException {
    		// 设置HTTP响应头的Content-Type字段值
    		response.setContentType("text/html");
    		// 获得用于输出消息的PrintWriter对象
    		PrintWriter out = response.getWriter();
    		out.println("<b>Hello World!</b>"); // 向客户端发送消息
    	}
    }

运行结果：

![Center][]

相应的web.xml

<?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">
      <display-name></display-name>
      <servlet>
        <description>This is the description of my J2EE component</description>
        <display-name>This is the display name of my J2EE component</display-name>
        <servlet-name>HelloWorld</servlet-name>
        <servlet-class>Excise.HelloWorld</servlet-class>
      </servlet>
    
      <servlet-mapping>
        <servlet-name>HelloWorld</servlet-name>
        
        <url-pattern>/servlet/HelloWorld</url-pattern>
      </servlet-mapping>	
      
      <welcome-file-list>
       
        <welcome-file>index.jsp</welcome-file>
      </welcome-file-list>
    </web-app>

[Center]: /images/20220714/8671f2f8e47742808f5941f2c2cfb3a5.png

Servlet—HelloWorld

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