get方法沒問題，post方法報405錯誤
HTTP Status [405] – [Method Not Allowed]
Type?Status Report
Message?HTTP method POST is not supported by this URL
Description?The method received in the request-line is known by the origin server but not supported by the target resource.
Apache Tomcat/9.0.0.M21
代碼：index.jsp:
<%@?page?language="java"?contentType="text/html;?charset=UTF-8"?pageEncoding="UTF-8"%> <%?? String?path?=?request.getContextPath();?? String?basePath?=?request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";?? %>? <!DOCTYPE?html> <html> <head> <base?href="<%=basePath%>">? <meta?http-equiv="Content-Type"?content="text/html;?charset=UTF-8"> <!--?<link?rel="stylesheet"?type="text/css"?href="">?--> <title>Insert?title?here</title> </head> <body> <h1>第一個servlet小例子</h1> <hr> <a?href="servlet/HelloServlet">Get方法請求HelloServlet</a> ???<form?action="servlet/HelloServlet"?method="post"> ???<input?type="submit"?value="用post方式提交HelloServlet"?/> ???</form> </body> </html>
HelloServlet.java:
package?servlet;
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?HelloServlet?extends?HttpServlet?{
@Override
protected?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException?{
//?TODO?Auto-generated?method?stub
System.out.println("處理Get請求……");
PrintWriter?out?=?response.getWriter();
response.setContentType("text/html;charset=utf-8");
out.println("<b>Hello?Servlet</b>");
}
@Override
protected?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException?{
System.out.println("處理Post請求……");
PrintWriter?out?=?response.getWriter();
response.setContentType("text/html;charset=utf-8");
out.println("<b>Hello?Servlet</b>");
}
}web.xml:
<?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"> <!--?歡迎頁面?--> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>HelloServlet</servlet-name> <servlet-class>servlet.HelloServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>HelloServlet</servlet-name> <url-pattern>/servlet/HelloServlet</url-pattern> </servlet-mapping> </web-app>
2019-03-20
換個瀏覽器吧，大概是緩存問題
2017-09-14
去掉super.doPost(req, resp);
2017-06-07
問題解決了。
代碼沒有錯，引起錯誤的是我的項目里Java Build Path 出了點問題（之前不曉得哪里出了錯，按照度娘上找的方法，手殘在點了build path，在Libraries那里加了不屬于它的文件，導致項目出錯。）。這個問題解決了就OK了。
Markers報錯：Archive for required library: 'WebContent/WEB-INF/web.xml' in project 'ServletDemo' cannot be read or is not a valid ZIP file ServletDemo Build path Build Path Problem
2017-06-06