問題描述:
啓動項目,丟失index.jsp導航欄組件。
原因查找:
運行到 index.jsp中的導航部件時候,沒經過servlet獲取數據。
解決方案:
所以我們可以使用過濾器,直接跳到servlet獲取數據來顯示。
package com.bs.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;
/**
* Servlet Filter implementation class IndexFilter
*/
@WebFilter(description = "過濾首頁", urlPatterns = { "/index.jsp" })
public class IndexFilter implements Filter {
/**
* Default constructor.
*/
public IndexFilter() {
// TODO Auto-generated constructor stub
}
/**
* @see Filter#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
}
/**
* @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
*/
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
// place your code here
/*
* 過濾器是一個接口,接口不能被實例化,因爲接口中的方法沒有方法體(只有方法的名字)
*/
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse resp = (HttpServletResponse) response;
req.getRequestDispatcher("IndexServlet").forward(req,resp);
// pass the request along the filter chain
chain.doFilter(req, resp);
}
/**
* @see Filter#init(FilterConfig)
*/
public void init(FilterConfig fConfig) throws ServletException {
// TODO Auto-generated method stub
}
}