我是Java的新手,尤其是使用sevlet的新手。我正在制作一个非常简单的servlet,但每当我提交表单时,servlet都没有被调用,我收到了一个错误。有人能帮帮我吗?
这是我的servlet代码:
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class sampleServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException {
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<body>");
out.println("<h1>Hello Servlet Get</h1>");
out.println("</body>");
out.println("</html>");
}
}
<form action="/sampleServlet/" method="GET">
<input type="submit" value="Submit form "/>
</form>
我得到的错误是:“请求的资源不可用。”
我的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"
id="WebApp_ID" version="3.1">
<display-name>Projekt</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
答案 0 :(得分:0)
您需要在web.xml中注册servlet或使用注释。使用注释的示例如下所示:
@WebServlet("/processForm")
public class MyServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException {
response.getWriter().println("Hello");
}
}
要了解如何在web.xml中注册,请检查: Creating and Configuring Servlets
要查看更多注释使用示例: WebServlet annotation examples
答案 1 :(得分:0)
您需要在web.xml中定义您的servlet,类似于:
<servlet>
<servlet-name>sampleServlet</servlet-name>
<servlet-class>package.sampleServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>sampleServlet</servlet-name>
<url-pattern>/sampleServlet</url-pattern>
</servlet-mapping>