標籤:http 目錄結構 schema 結構 檔案 html 項目 lang nbsp
1、目錄結構
2、各檔案內容
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()..."); }}
正常運行後運行後,Server控制台會出現輸出“doPost()...”字元
3、當未配置web.xml時,出現的錯誤提示
<?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>
解決方案:在web.xml中配置相關資訊,或在Servlet.java註解中新增內容:
@WebServlet(name = "Servlet",urlPatterns = "/Servlet")
4、配置web.xml檔案但未覆寫doGet()和doPost()方法,或未覆寫相對應的方法出現的錯誤提示
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()..."); }}
建立Web項目運行時出小錯誤及解決方案