Java 如何从JSP页面获取数据到servlet
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How to get data from JSP page to servlet
提问by Prasanna
I'm new to Servlet functionality. I'm trying to get some data in JSP Form and trying to print it in console using Servlet. But i'm not able to do that.
我是 Servlet 功能的新手。我试图在 JSP 表单中获取一些数据并尝试使用 Servlet 在控制台中打印它。但我不能那样做。
web.xml
网页.xml
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<servlet>
<servlet-name>controlServlet</servlet-name>
<servlet-class>com.selenium8x8.servlet.ControlServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>controlServlet</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
Startup.jsp
启动文件
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="Startup" method="post">
<input type="text" name="name"/><br>
<input type="text" name="group"/>
<input type="text" name="pass"/>
<input type="submit" value="submit">
</form>
</body>
</html>
ControlServlet.java
ControlServlet.java
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ControlServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String name = request.getParameter("name");
String group = request.getParameter("group");
String pass = request.getParameter("pass");
System.out.println("Name :"+ name);
System.out.println("group :"+ group);
System.out.println("pass :"+ pass);
}
}
After execution, it throws me the following error,
执行后，它向我抛出以下错误，
HTTP Status 405 - HTTP method GET is not supported by this URL
type Status report
message HTTP method GET is not supported by this URL
description The specified HTTP method is not allowed for the requested resource.
采纳答案by user2821894
@Prassana:Please modify your web.xml as below and it should work. I tested your code and its working for me. This will work for both GET and POST.
@Prassana：请修改您的 web.xml 如下，它应该可以工作。我测试了你的代码，它对我有用。这将适用于 GET 和 POST。
<servlet>
<servlet-name>ControlServlet</servlet-name>
<servlet-class>com.selenium8x8.servlet.ControlServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ControlServlet</servlet-name>
<url-pattern>/Startup</url-pattern>
</servlet-mapping>
</web-app>
回答by Dark Knight
Need to change action in form tag with following
需要通过以下方式更改表单标签中的操作
<form action="/Startup" method="post">
回答by Hussain Akhtar Wahid 'Ghouri'
replace
this : <form action="Startup"
替换这个： <form action="Startup"
by this : <form action="/Startup"
这样 ： <form action="/Startup"
回答by Suresh Atta
Change mapping
更改映射
<form action="/Startup" method="post">
Step2 : add ovverideannotation
Step2：添加ovveride注解
@Override
public void doPost(HttpServletReques...
It is unable to detect your post method and trying to hit getmethod I guess.
get我猜它无法检测到您的 post 方法并尝试点击方法。
And try to check with get method also once,
并尝试使用 get 方法检查一次，
@Override
public void doGet(HttpServletReques...
