记录 Java 应用程序的所有网络交互
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Log all network interactions of Java application
提问by Hnatt
I have a monstrous Java app (a client of little-known application server GNUEnterprise) and its source, which I can compile back after making some changes to it. The app uses network heavily and I need to monitor each request and response. I could use a sniffer like Wireshark, but the application works with its server over SSL, so not knowing SSL-certificate's private key any sniffed traffic is pretty useless.
我有一个可怕的 Java 应用程序（鲜为人知的应用程序服务器 GNUEnterprise 的客户端）及其源代码，我可以在对其进行一些更改后重新编译。该应用程序大量使用网络，我需要监视每个请求和响应。我可以使用像 Wireshark 这样的嗅探器，但是该应用程序通过 SSL 与其服务器一起工作，因此不知道 SSL 证书的私钥，任何嗅探到的流量都非常无用。
What can I do to make every request and response to be logged from the application itself? I need to see all sent and received headers. I don't want to alter all code responsible for network interaction. What I want is to put a code like
我该怎么做才能从应用程序本身记录每个请求和响应？我需要查看所有发送和接收的标头。我不想更改所有负责网络交互的代码。我想要的是放一个代码
Network.setDefaultLogger(myCustomLoggerInstance);
somewhere near start of the app and then in the myCustomLoggerInstancedo all the logging I need.
在应用程序开始附近的某个地方，然后在myCustomLoggerInstance做我需要的所有日志记录。
Also, given all network operations are made with URLConnections, I can get response headers with con.getHeaderFields()and request headers with con.getRequestProperties(). But why cookies aren't there? How to dump sent and received cookies in the same way?
此外，鉴于所有网络操作都是使用URLConnections 进行的，我可以con.getHeaderFields()使用con.getRequestProperties(). 但是为什么没有cookies呢？如何以相同的方式转储发送和接收的 cookie？
EDIT: What I'm trying to reach is to mimic RPC-application's communication with it's server over SSL, say, using curl. For this I need to get detailed log of app's network traffic.
编辑：我想要达到的是通过 SSL 模拟 RPC 应用程序与其服务器的通信，例如，使用curl. 为此，我需要获取应用程序网络流量的详细日志。
采纳答案by GreyFairer
Can't you use a logging proxy server, e.g. http://www.charlesproxy.com/or http://fiddler2.com/? Charles Proxy can also decode AMF requests, Fiddler is the champion for SSL interception.
您不能使用日志代理服务器，例如http://www.charlesproxy.com/或http://fiddler2.com/吗？Charles Proxy 也可以解码 AMF 请求，Fiddler 是 SSL 拦截的冠军。
IIRC you can set system properties http.proxyHost and http.proxyPort to 127.0.0.1 and 8888, and java URLConnections will automatically connect via your logging proxy server, and you get a nice view of your HTTP Traffic.
IIRC 您可以将系统属性 http.proxyHost 和 http.proxyPort 设置为 127.0.0.1 和 8888，并且 java URLConnections 将通过您的日志代理服务器自动连接，您可以很好地查看 HTTP 流量。
Or, if the intention is to be able to replay the communication, use JMeter HTTP Proxy, this records in a format that is suitable for replay. It has also built-in support for handling cookies.
或者，如果目的是能够重放通信，请使用 JMeter HTTP 代理，以适合重放的格式记录。它还内置了处理 cookie 的支持。
If the application uses nice web services, SoapUI also has a monitoring proxy that intercepts web service calls for which you have imported the WSDL.
如果应用程序使用了不错的 Web 服务，SoapUI 也有一个监视代理来拦截您导入 WSDL 的 Web 服务调用。
回答by giampaolo
I just want to post a snippet of code that you can use at starting point. I do not have a"global" logger but with small changes to existing code you can reach your goal. I "log" on standard output, since your problem can be split into two pieces: getting the info from UrlConnection and store it for further reference.
我只想发布您可以在起点使用的代码片段。我没有“全局”记录器，但是对现有代码进行一些小的更改就可以实现您的目标。我在标准输出上“登录”，因为您的问题可以分为两部分：从 UrlConnection 获取信息并将其存储以供进一步参考。
This code logs the request:
此代码记录请求：
public class URLConnectionReader {
public static void main(String[] args) throws Exception {
URL oracle = new URL("http://www.google.com/");
URLConnection yc = oracle.openConnection();
String headerName = null;
for (int i = 1; (headerName = yc.getHeaderFieldKey(i)) != null; i++) {
if (headerName.equals("Set-Cookie")) {
String cookie = yc.getHeaderField(i);
System.out.println("Cookie :: " + cookie);
} else {
System.out.println("Header: "+ yc.getHeaderField(i));
}
}
BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream()));
String inputLine;
while ((inputLine = in.readLine()) != null)
System.out.println(inputLine);
in.close();
}
}
}
saving all this data to one or more files is not hard. If you believe that I'm on right way for you problem, I would be glad to edit the answer with other details as needed.
将所有这些数据保存到一个或多个文件并不难。如果您认为我对您的问题是正确的，我很乐意根据需要使用其他详细信息编辑答案。
回答by GreyFairer
I dug a little further, and apparently, HttpURLConnection comes with java.util.logging enabled by default.
我进一步挖掘了一点，显然 HttpURLConnection 默认启用了 java.util.logging。
See related questions: Java: Display request of an HttpURLConnection before sendingand How to enable wire logging for a java HttpURLConnection traffic?
请参阅相关问题： Java：在发送之前显示 HttpURLConnection 的请求以及如何为 java HttpURLConnection 流量启用线路日志记录？
Java.util.logging was Sun's (failed) attempt at standardizing logging providers in Java 1.4. You can bridge it to SLF4J via the jul-to-slf4j module if you want to avoid tweaking system properties.
Java.util.logging 是 Sun 在 Java 1.4 中标准化日志记录提供程序的（失败）尝试。如果您想避免调整系统属性，您可以通过 jul-to-slf4j 模块将其桥接到 SLF4J。
But I would still prefer Fiddler or JMeter proxy though :-)
但我仍然更喜欢 Fiddler 或 JMeter 代理:-)
回答by Ehsan Khodarahmi
If you want to log network traffic & you have URLConnection objects then the problem is already solved!
If you want to log at stream level, you need to write a little wrapper on top of your I/O streams & log all data before transfer them to lower network layers, otherwise you can use connection objects directly to get required info & log them.
For managing cookies, you should use java.net.HttpCookiewhich is introduced in java 6. Only thing you have to do is to create an instance of CookieManager & set it as default cookie manager:
如果你想记录网络流量并且你有 URLConnection 对象，那么问题已经解决了！
如果要在流级别进行日志记录，则需要在 I/O 流之上编写一个小包装器并记录所有数据，然后再将它们传输到较低的网络层，否则您可以直接使用连接对象来获取所需信息并记录它们.
要管理 cookie，您应该使用java.net.HttpCookiejava 6 中引入的 which。您唯一要做的就是创建一个 CookieManager 实例并将其设置为默认 cookie 管理器：
CookieManager cookieManager = new CookieManager();
CookieHandler.setDefault(cookieManager);
& you can use it for managing connection cookies!
& 您可以使用它来管理连接 cookie！
回答by Julius Musseau
A quick way to log all SSL traffic is to startup java with:
记录所有 SSL 流量的一种快速方法是使用以下命令启动 java：
-Djavax.net.debug=all
Or set it as a system property:
或将其设置为系统属性：
System.setProperty("javax.net.debug","all");
Brace yourself. Standard out gets NOISY if you do this!
振作起来。如果你这样做，标准输出会变得嘈杂！
(*Note: only logs SSL traffic and SSL debug info (handshakes, etc). Regular sockets are not logged.)
（*注意：仅记录 SSL 流量和 SSL 调试信息（握手等）。不记录常规套接字。）
