1、目录结构
2、各文件内容
index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %><html> ?<head> ???<title>$Title$</title> ?</head> ?<body> ???<form action="/Servlet" method="post"> ?????<input type="submit" value="提交"> ???</form> ?</body></html>
web.xml
<?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>web.servlet.Servlet</servlet-class> ???</servlet> ???<servlet-mapping> ???????<servlet-name>Servlet</servlet-name> ???????<url-pattern>/Servlet</url-pattern> ???</servlet-mapping></web-app>
Servlet.java
package web.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;@WebServlet(name = "Servlet")public class Servlet extends HttpServlet { ???protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ???????System.out.println("doPost()..."); ???} ???protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ???????System.out.println("doGet()..."); ???}}正常运行后运行后，Server控制台会出现输出“doPost()...”字符
3、当未配置web.xml时，出现的错误提示
<?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"></web-app>
解决方法：在web.xml中配置相关信息，或在Servlet.java注解中添加内容：
@WebServlet(name = "Servlet",urlPatterns = "/Servlet")
4、配置web.xml文件但未覆写doGet()和doPost()方法，或未覆写相对应的方法出现的错误提示
package web.servlet;@WebServlet(name = "Servlet")public class Servlet extends HttpServlet { ???}package web.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;@WebServlet(name = "Servlet")public class Servlet extends HttpServlet { ???protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ???????System.out.println("doGet()..."); ???}}创建Web项目运行时出小错误及解决方法
原文地址：http://www.cnblogs.com/gdwkong/p/7442697.html