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我试图重现this example使用过滤器
更换反应的身体我已代码:
public void doFilter(ServletRequest request,
ServletResponse response,
FilterChain chain)
throws java.io.IOException, ServletException {
HtmlResponseWrapper capturingResponseWrapper = new HtmlResponseWrapper(
(HttpServletResponse) response);
// Pass request back down the filter chain
chain.doFilter(request,response);
if (response.getContentType() != null
&& response.getContentType().contains("text/html")) {
String content = capturingResponseWrapper.getCaptureAsString();
// replace stuff here
String replacedContent = content.replaceAll(
"<h2[^>]*>(.*?)</h2>",
"<h3>$1 - HTML replaced</h3>");
System.out.println(replacedContent);
response.getWriter().write(replacedContent);
}
导航到HTML页面执行此代码我收到500错误:
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
难道我滥用了一些东西?如果我摆脱chain.doFilter(request,response);
我不收回任何例外,但我得到空白的答复正文。
传递给doFilter的原始响应()方法,你应该通过不写什么到OutputStream的使用ResponseWrapper。如果原始响应通过,控制返回到过滤器就太迟了。 http://stackoverflow.com/a/14736818/185565 – Whome