今日有两个微信web项目合并了，但是还有些链接指向废弃的项目，另外不想在服务器上运行两份相同web项目(1、影响性能、2、维护升级容易出错)，因此决定写一个简单链接跳转的项目，spring的filter过滤器可以实现，但想想spring干这个有点大材小用，想到java的servlet可以支持通配符，因此用servlet写了一个简单的跳转程序，总共花了不到一小时的时间。废话少说上代码：
1 /** 2 * Servlet implementation class Default 3 */ 4 @WebServlet("/*") 5 public class Default extends HttpServlet { 6 private static final long serialVersionUID = 1L; 7 8 /** 9 * @see HttpServlet#HttpServlet() 10 */ 11 public Default() { 12 super(); 13 // TODO Auto-generated constructor stub 14 } 15 16 /** 17 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse 18 * response) 19 */ 20 protected void doGet(HttpServletRequest request, 21 HttpServletResponse response) throws ServletException, IOException { 22 String thisURI = request.getRequestURL().toString(); 23 String queryString = request.getQueryString(); 24 String host = "112.125.121.163"; 25 //String host = "localhost"; 26 String oldURI = "http://" + host + ":8080/travel-core"; 27 if (thisURI.indexOf(oldURI) >= 0) { 28 String newURI = thisURI.replaceAll(oldURI, "http://" + host 29 + ":8080/travel-weixin"); 30 if (queryString != null && queryString.length() > 0) 31 newURI += "?" + queryString; 32 response.sendRedirect(newURI); 33 } 34 } 35 36 /** 37 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse 38 * response) 39 */ 40 protected void doPost(HttpServletRequest request, 41 HttpServletResponse response) throws ServletException, IOException { 42 this.doGet(request, response); 43 } 44 45 }
注意代码第四行是关键@WebServlet("/*")，这里使用了通配符，所有的请求都会送到doGet和doPost方法里，另外要注意 request.getRequestURL()方法不能获取到queryString因此一定要request.getQueryString()获取参数，拼到新地址的后面。