java命令行绝对路径 java绝对路径怎么写

一般服务器内部跳转是相对路径，其他的都是绝对路径比较好，这样报错比较少
而关于绝对路径，一般就在相对路径前加上绝对地址，讲不清了，上码
建一个EncodingFilter过滤器

package com.dodoke.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.http.HttpServletRequest;

/**
 * Servlet Filter implementation class EncodingFilter
 */
public class EncodingFilter implements Filter {

    /**
     * Default constructor. 
     */
    public EncodingFilter() {
        // 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 req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		// place your code here
		//这部分是网上copy的，也不用记，记不住的
		HttpServletRequest request = (HttpServletRequest) req;
		String basePath = request.getScheme() + "://" + request.getServerName() + (request.getServerPort() == 80 ? "" : ":" + request.getServerPort()) + request.getContextPath();
		request.setAttribute("basePath", basePath);
		System.out.println(basePath);
		// pass the request along the filter chain
		chain.doFilter(req, res);
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}

然后在xml里配置一下

<filter>
    <filter-name>EncodingFilter</filter-name>
    <filter-class>com.dodoke.filter.EncodingFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>EncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>