Camel Jetty组件写入Outputstream

Question

我在Camel中有一个长时间运行的进程，它是由HTTP请求触发的。我想将状态更新写入Outputstream，但在客户端没有得到响应。

我尝试使用以下内容：

骆驼路线：

<from uri="jetty:http://localhost:12345/myservice"/>
<process ref="test" />

处理器测试：

public void process(Exchange arg0) throws Exception {
    System.out.println("TestProcessor");
    HttpServletResponse response = (HttpServletResponse) arg0.getIn().getHeader(Exchange.HTTP_SERVLET_RESPONSE);
    OutputStreamWriter wr = new OutputStreamWriter(response.getOutputStream());
    BufferedWriter w = new BufferedWriter(wr);
    for(int x = 0; x < 10; x++){
        w.write("Zeile: " + x + "n");
        w.newLine();
    }
//      arg0.getIn().setBody("This might also be a response");
}

呼叫代码：

final HttpURLConnection conn = (HttpURLConnection) url.openConnection();           
            conn.setDoOutput( true );
            conn.setInstanceFollowRedirects( false );
            conn.setRequestMethod( "GET" );
            conn.setRequestProperty( "Content-Type", "application/x-www-form-urlencoded"); 
            conn.setRequestProperty( "charset", "utf-8");
            conn.setRequestProperty( "Content-Length", Integer.toString( postDataLength ));
            conn.setUseCaches( false );
            new Thread(new Runnable(){
                @Override
                public void run() {
                    try {
                        if(!urlParameters.isEmpty()){
                            try( DataOutputStream wr = new DataOutputStream( conn.getOutputStream())) {
                               wr.write( postData );
                               wr.close();
                            }
                        }
                        InputStream s = conn.getInputStream();
                        System.out.println("got InputStream");
                        InputStreamReader is = new InputStreamReader(s);
                        BufferedReader br = new BufferedReader(is);
                        String line;
                        while((line = br.readLine()) != null){
                            System.out.println("ReadLine: " + line);
                        }
                        conn.disconnect();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }).start();

但只有当我在处理器中设置主体（注释行）时，我才会得到响应。有什么方法可以保持骆驼的联系并继续写信给它吗？

Answer 1

您应该使用out消息发送带有HTTP组件的答案：

arg0.getOut().setBody("This might also be a response");

HTTP组件使用HttpBinding将HttpServletRequest转换为Exchange，相反，从Exchange填充HttpServletResponse。您可以在这里看到默认实现，也可以提供自己的实现。