我正在尝试实现一个简单的Grizzly Web服务器,该服务器在收到HTTP请求后将:


处理指定的过滤器
将请求回送给发件人


我正在从soapUI提交请求,并且看到了意外的行为:

RunServer.java:

public class RunServer{
    public static final String HOST = "localhost";
    public static final int PORT = 5151;

    public static void main(String[] args) {
        final HttpServer server = HttpServer.createSimpleServer();

        NetworkListener listener = new NetworkListener("echoCalls", "localhost", 5151);

        FilterChainBuilder filterChainBuilder = FilterChainBuilder.stateless();

        filterChainBuilder.add(new TransportFilter());

        filterChainBuilder.add(new StringFilter(Charset.forName("UTF-8")));
        //filterChainBuilder.add(new StringFilter(Charset.forName("ISO-8859-1")));
        //filterChainBuilder.add(new StringFilter(Charset.forName("ASCII")));

        filterChainBuilder.add(new MyEchoFilter());

        listener.setFilterChain(filterChainBuilder.build());

        server.addListener(listener);

        server.getServerConfiguration().addHttpHandler(new MyEchoHandler(), "/echo");

        try{
            server.start();
            System.out.println("Press any key to stop the server...");
            System.in.read();
        }catch(IOException ioe){
            System.err.println(ioe.toString());
        }finally{
            server.stop();
        }

    }

}


MyEchoFilter.java:

public class MyEchoFilter extends BaseFilter{

    public NextAction handleRead(FilterChainContext ctx)throws IOException{

        System.err.println(">>>MyEchoFilter.handleRead()...");

        //|why not working? no response, eventual time out. soapui just hangs up after return NextAction...

        final Object peerAddress = ctx.getAddress();
        final Object message = ctx.getMessage();
        ctx.write(peerAddress, message, null);

        return ctx.getStopAction();
    }

    public NextAction handleWrite(FilterChainContext ctx) throws IOException{
        System.err.println(">>>MyEchoFilter.handleWrite()...");

        return ctx.getStopAction();
    }

    public NextAction handleConnect(FilterChainContext ctx) throws IOException{
        System.err.println(">>>MyEchoFilter.handleConnect()...");

        return ctx.getStopAction();
    }

    public NextAction handleAccept(FilterChainContext ctx) throws IOException{
        System.err.println(">>>MyEchoFilter.handleAccept()...");

        return ctx.getStopAction();
    }

    public NextAction handleClose(FilterChainContext ctx) throws IOException{
        System.err.println(">>>MyEchoFilter.handleClose()...");

        return ctx.getStopAction();
    }

}


MyEchoHandler:

public class MyEchoHandler extends HttpHandler{

    public void service(Request req, Response res) throws Exception{

        System.err.println(">>>handler service method...");

        BufferedReader requestStream = new BufferedReader(new InputStreamReader(req.getInputStream()));

        String reqStrLn;
        StringBuffer callContent = new StringBuffer();
        while((reqStrLn = requestStream.readLine()) != null) callContent.append(reqStrLn);

        res.setContentLength(callContent.length());
        res.getWriter().write(callContent.toString());
    }
}


使用上面的代码,按原样,在启动soapUI请求时将触发handleAccept()方法。奇怪的是,除非我在RunServer中注释掉UTF-8字符串过滤器,否则handleRead()方法不会触发:

//filterChainBuilder.add(new StringFilter(Charset.forName("UTF-8")));


我无法弄清楚,如果有人能解释,我将不胜感激。

但是,更重要的是,MyEchoHandler中的service()方法也不会触发。

仅当我注释掉在RunServer中将FilterChain设置为NetworkListener的行时才会触发:

//listener.setFilterChain(filterChainBuilder.build());


当我确实避免使用FilterChain时,实际上确实得到了对soapUI的响应,但我确实需要FilterChain。

似乎我在这里遗漏了一部分要点,我应该避免使用处理程序,而是使用过滤器,但是我在使用过滤器时无法获得对soapUI的响应。

谁能帮助我找出我的方式的错误?

先感谢您!

最佳答案

当我也遇到这个问题时,确实花了我很多时间来弄清楚。

filterChainBuilder.add(new StringFilter(Charset.forName("UTF-8")));


StringFilter将字符串解码/编码为字节,因此使用特殊的长度前缀。如果传入消息无法解码,则会跳过该消息。因此,看起来方法'handleRead'不会触发。

关于java - 灰熊2.2.19 FilterChain与HttpHandler,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/20963970/

10-09 07:00