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建议同学新建一个空的JavaWeb项目，发布到Tomcat9后试一下，看是否可以启动成功；如果可以启动成功，说明Tomcat服务器没有问题，是当前发布的项目配置文件存在问题，此时同学可以把项目结构和配置文件帖一下；如果不可以启动成功，建议重新下载Tomcat后再试下~
祝学习愉快！
WindBelll
2019-01-01 17:45:15
<?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>LibraryManageSystem</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>
<servlet-name>init</servlet-name>
<servlet-class>com.cl.servlet.InitServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>init</servlet-name>
<url-pattern>/InitServlet</url-pattern>
</servlet-mapping>
<filter>
<filter-name>encoding</filter-name>
<filter-class>com.cl.filter.EncodingFilter</filter-class>
<init-param>
<param-name>charset</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
//初始化的servlet代码如下
package com.cl.servlet;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import com.cl.domain.User;
/**
* Servlet implementation class InitServlet
*/
public class InitServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void init(ServletConfig config) throws ServletException {
// TODO Auto-generated method stub
List<User> list=new ArrayList<User>();
this.getServletContext().setAttribute("userMsg", list);
}
}
//sesssionFilter,不知到是不是这个的原因
package com.cl.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebFilter(urlPatterns= {"server.jsp","addBook.jsp","catgory.jsp","showBooks.jsp","top.jsp"})
public class LoginFilter implements Filter {
@Override
public void destroy() {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
System.out.println("<----LoginFilte----->");
HttpServletRequest hrequest=(HttpServletRequest)request;
HttpServletResponse hresponse=(HttpServletResponse)response;
String username=(String)hrequest.getSession().getAttribute("user");
//String uri=hrequest.getRequestURI();
//System.out.println(uri);
if(username==null||username=="") {
hresponse.sendRedirect(hrequest.getContextPath()+"/index.jsp?flag=1");
}else {
chain.doFilter(request, response);
return;
}
}
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// TODO Auto-generated method stub
}
}相似问题
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