關(guān)于這個(gè)問(wèn)題，跟undefined差不多常見(jiàn)。原因就是數(shù)據(jù)源為空字符（而非空）。

500 Servlet Exception

java.lang.StringIndexOutOfBoundsException: String index out of range: 1
	at java.lang.String.substring(String.java:1935)
	at yixun.wap.filter.ReplaceTextStream.replaceContent(ReplaceTextFilter.java:32)
	at yixun.wap.filter.ReplaceTextFilter.doFilter(ReplaceTextFilter.java:81)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:73)
	at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:167)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:226)
	at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:263)
	at com.caucho.server.port.TcpConnection.run(TcpConnection.java:477)
	at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:591)
	at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:513)
	at java.lang.Thread.run(Thread.java:619)