我有以下的servlet代码我的班是不是一个servlet错误
public void doPost(HttpServletRequest request, HttpServletResponse response){
Backup bup = new Backup();
bup.doBackup();
response.setContentType("text/html");
PrintWriter out;
try {
out = response.getWriter();
out.println("You backed up your data - well hopefully");
out.flush();
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
而下面的堆栈跟踪
javax.servlet.ServletException:类 view.BackupServlet不是一个Servlet org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) org.apache.coyote.http11.Http11Processor.process( Http11Proc essor.java:849) org.apache.coyote.http11.Http11Protocol $ Http11ConnectionHandler.process(Http11Protocol.java:583) org.apache.tomcat.util.net.JIoEndpoint $ Worker.run(JIoEndpoint.java:454) java.lang.Thread.run(Thread.java:619)
根源
java.lang.ClassCastException: view.BackupServlet不能转换到 javax.servlet.Servlet org.apache。 catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) org.apache.coyote .http11.Http11Processor.process(Http11Processor.java:849) org.apache.coyote.http11.Http11Protocol $ Http11ConnectionHandler.process(Http11Protocol.java:583) org.apache.tomcat.util.net.JIoEndpoint $ Worker.run (JIoEndpoint.java:454) java.lang.Thread.run(Thread.java:619)
和web.xml中是
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-<br>app_2_4.xsd">
<display-name>Backup</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>
<servlet>
<description>BackupServlet</description>
<display-name>BackupServlet</display-name>
<servlet-name>BackupServlet</servlet-name><br>
<servlet-class>view.BackupServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>BackupServlet</servlet-name>
<url-pattern>/BackupServlet</url-pattern>
</servlet-mapping>
</web-app>`