Java Servlet:HTTP状态404-请求的资源不可用
我是Java编程新手&由于Servlets和JSP带来的广泛挑战,我在使用它时遇到了困难。目前,由于以下错误,我无法访问Servlet页面:Java Servlet:HTTP状态404-请求的资源不可用,java,html,jsp,servlets,Java,Html,Jsp,Servlets,我是Java编程新手&由于Servlets和JSP带来的广泛挑战,我在使用它时遇到了困难。目前,由于以下错误,我无法访问Servlet页面: HTTP Status 404 - The requested resource is not available 对于许多人来说,这似乎是一个幼稚的问题,但是在尝试了从堆栈溢出到求助于其他研究材料的所有技巧和技巧后,我无法找出问题的确切原因 Servlet文件: package coreservlets; import java.io.IOExce
HTTP Status 404 - The requested resource is not available
对于许多人来说,这似乎是一个幼稚的问题,但是在尝试了从堆栈溢出到求助于其他研究材料的所有技巧和技巧后,我无法找出问题的确切原因
Servlet文件:
package coreservlets;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/GoodCodeServlet")
public class GoodCodeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String title = "Code Sample";
String docType = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " +
"Transitional//EN\">\n";
out.println(docType + "<html> \n" +
"<head> <title>" +title+ "</title></head>" +
"<body bgcolor=\"#eee\">" +
"<h1 align=\"center\">" +title+ "</h1>" +
// Text inside a <pre> tag is displayed in a fixed-width font,
//and it preserves both spaces and line breaks....
"<pre> \n" + getCode(request)+ "</pre>" +
"</body> </html>"
);
}
protected String getCode(HttpServletRequest request)
{
return (request.getParameter("code"));
}
HTML文件:
web.xml文件:
表单操作中缺少上下文路径 请参阅:
您已经在servlet中定义了注释。那么web.xml中就不需要映射了。。删除映射。在Servlet类中尝试映射..更改为在发布之前尝试了这些技巧,但不知怎么的,它没有起作用:有趣的是,同一个包中的其他Servlet程序在相同的web.xml文件中有条目,工作绝对正常。请在提交表单后发布url。。
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body bgcolor="#FDEFD6">
<center> <h1>Submit Code Samples</h1>
<form action="/coreservlets.GoodCodeServlet" >
Code: <br><br>
<textarea rows="12" cols="40" name="code"></textarea> <br><br>
<input type="submit" value="submit" />
</form>
</center>
</body>
</html>
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
<servlet>
<servlet-name>CodeSample</servlet-name>
<servlet-class>coreservlets.GoodCodeServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CodeSample</servlet-name>
<url-pattern>/coreservlets.GoodCodeServlet</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>ShowParameters</servlet-name>
<servlet-class>/coreservlets.ShowParameters</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ShowParameters</servlet-name>
<url-pattern>/coreservlets.ShowParameters</url-pattern>
</servlet-mapping>
</web-app>