使用idea開發工具調試代碼的時候，如果是java的web項目，使用的是tomcat作為web容器，打斷點debug調試跟蹤，當跟蹤到org.apache.catalina包下的時候，則無法進入，這是因為idea運行的tomcat是通過插件的方式集成的，tomcat里面的lib包不再項目的依賴路徑中，所以不能跟蹤進去

首先在自己項目中被tomcat回調的接口實現類中，標記一個斷點信息，通過idea啟動web項目，當出現如圖所示的斷點信息的時候，因為斷點位置標記的是tomcat回調的接口類，所以按照調用堆棧網上則是tomcat內部代碼，但此時雙擊org.apache.catalina包下面的類名，是沒有任何反應的，因為我們還沒有將tomcat對應的依賴文件添加到classpath下面

添加依賴

<dependency>
 <groupId>org.apache.tomcat</groupId>
 <artifactId>tomcat-catalina</artifactId>
 <version>8.5.55</version>
 <scope>provided</scope>
</dependency>

因為運行時使用的是tomcat的lib目錄下面的jar文件，所以此處的scope使用provided方式

下面就可以進入到tomcat源碼調試了

tomcat啟動日志是怎么執行打出來的？

03-Jun-2020 10:31:30.929 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Server.服務器版本: Apache Tomcat/8.5.55
03-Jun-2020 10:31:30.938 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 服務器構建:    May 5 2020 22:10:54 UTC
03-Jun-2020 10:31:30.938 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 服務器版本號(:   8.5.55.0
03-Jun-2020 10:31:30.938 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 操作系統名稱:   Windows 10
03-Jun-2020 10:31:30.938 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log OS.版本:      10.0
03-Jun-2020 10:31:30.938 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 架構:       amd64
03-Jun-2020 10:31:30.939 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Java 環境變量:   C:\Program Files\Java\jdk1.8.0_212\jre
03-Jun-2020 10:31:30.939 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Java虛擬機版本:  1.8.0_212-b10
03-Jun-2020 10:31:30.939 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log JVM.供應商:    Oracle Corporation
03-Jun-2020 10:31:30.939 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_BASE:   C:\Users\Administrator\.IntelliJIdea2018.3\system\tomcat\Unnamed_spring-shiro-training
03-Jun-2020 10:31:30.939 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_HOME:   D:\tomcat8.5.55\apache-tomcat-8.5.55

通過定位到 VersionLoggerListener 日志可以查看到

private void log() {
 log.info(sm.getString("versionLoggerListener.serverInfo.server.version",
  ServerInfo.getServerInfo()));
 log.info(sm.getString("versionLoggerListener.serverInfo.server.built",
  ServerInfo.getServerBuilt()));
 log.info(sm.getString("versionLoggerListener.serverInfo.server.number",
  ServerInfo.getServerNumber()));
 log.info(sm.getString("versionLoggerListener.os.name",
  System.getProperty("os.name")));
 log.info(sm.getString("versionLoggerListener.os.version",
  System.getProperty("os.version")));
 log.info(sm.getString("versionLoggerListener.os.arch",
  System.getProperty("os.arch")));
 log.info(sm.getString("versionLoggerListener.java.home",
  System.getProperty("java.home")));
 log.info(sm.getString("versionLoggerListener.vm.version",
  System.getProperty("java.runtime.version")));
 log.info(sm.getString("versionLoggerListener.vm.vendor",
  System.getProperty("java.vm.vendor")));
 log.info(sm.getString("versionLoggerListener.catalina.base",
  System.getProperty("catalina.base")));
 log.info(sm.getString("versionLoggerListener.catalina.home",
  System.getProperty("catalina.home")));


 if (logArgs) {
 List<String> args = ManagementFactory.getRuntimeMXBean().getInputArguments();
 for (String arg : args) {
  log.info(sm.getString("versionLoggerListener.arg", arg));
 }
 }


 if (logEnv) {
 SortedMap<String, String> sortedMap = new TreeMap<>(System.getenv());
 for (Map.Entry<String, String> e : sortedMap.entrySet()) {
  log.info(sm.getString("versionLoggerListener.env", e.getKey(), e.getValue()));
 }
 }


 if (logProps) {
 SortedMap<String, String> sortedMap = new TreeMap<>();
 for (Map.Entry<Object, Object> e : System.getProperties().entrySet()) {
  sortedMap.put(String.valueOf(e.getKey()), String.valueOf(e.getValue()));
 }
 for (Map.Entry<String, String> e : sortedMap.entrySet()) {
  log.info(sm.getString("versionLoggerListener.prop", e.getKey(), e.getValue()));
 }
 }
}

發現是通過鍵值對的方式獲取的，再通過字符串全局搜索發現

但是匹配的是英文，那么中文是怎么打出來的呢？

最后通過調試發現找的是這個

類似上面的東西,調試的時候發現tocmat的東西啟動還是相當多的
且看下面這個

idea tomcat啟動后的數據

03-Jun-2020 10:31:30.939 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數：-Djava.util.logging.config.file=C:\Users\Administrator\.IntelliJIdea2018.3\system\tomcat\Unnamed_spring-shiro-training\conf\logging.properties
03-Jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數：-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
03-Jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數：-agentlib:jdwp=transport=dt_socket,address=127.0.0.1:52290,suspend=y,server=n
03-Jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數：-javaagent:C:\Users\Administrator\.IntelliJIdea2018.3\system\captureAgent\debugger-agent.jar
03-Jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數：-Dfile.encoding=UTF-8
03-Jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數：-Dcom.sun.management.jmxremote=
03-Jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數：-Dcom.sun.management.jmxremote.port=1099
03-Jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數：-Dcom.sun.management.jmxremote.ssl=false
03-Jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數：-Dcom.sun.management.jmxremote.password.file=C:\Users\Administrator\.IntelliJIdea2018.3\system\tomcat\Unnamed_spring-shiro-training\jmxremote.password
03-Jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數：-Dcom.sun.management.jmxremote.access.file=C:\Users\Administrator\.IntelliJIdea2018.3\system\tomcat\Unnamed_spring-shiro-training\jmxremote.access
03-Jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數：-Djava.rmi.server.hostname=127.0.0.1
03-Jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數：-Djdk.tls.ephemeralDHKeySize=2048
03-Jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數：-Djava.protocol.handler.pkgs=org.apache.catalina.webresources
03-Jun-2020 10:31:30.941 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數：-Dignore.endorsed.dirs=
03-Jun-2020 10:31:30.941 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數：-Dcatalina.base=C:\Users\Administrator\.IntelliJIdea2018.3\system\tomcat\Unnamed_spring-shiro-training
03-Jun-2020 10:31:30.941 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數：-Dcatalina.home=D:\tomcat8.5.55\apache-tomcat-8.5.55
03-Jun-2020 10:31:30.941 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數：-Djava.io.tmpdir=D:\tomcat8.5.55\apache-tomcat-8.5.55\temp

以上還只是基本的環境配置等啟動
然后是準備鏈接到tomcat服務

03-Jun-2020 10:31:30.941 信息 [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent 使用APR版本[1.7.0]加載了基于APR的Apache Tomcat本機庫[1.2.24]。
03-Jun-2020 10:31:30.941 信息 [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR功能：IPv6[true]、sendfile[true]、accept filters[false]、random[true]。
03-Jun-2020 10:31:30.941 信息 [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent APR/OpenSSL配置：useAprConnector[false]，useOpenSSL[true]
03-Jun-2020 10:31:30.944 信息 [main] org.apache.catalina.core.AprLifecycleListener.initializeSSL OpenSSL成功初始化 [OpenSSL 1.1.1g  21 Apr 2020]
03-Jun-2020 10:31:31.032 信息 [main] org.apache.coyote.AbstractProtocol.init 初始化協議處理器 ["http-nio-8080"]
03-Jun-2020 10:31:31.046 信息 [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
03-Jun-2020 10:31:31.055 信息 [main] org.apache.catalina.startup.Catalina.load Initialization processed in 175489 ms
03-Jun-2020 10:31:31.080 信息 [main] org.apache.catalina.core.StandardService.startInternal 正在啟動服務[Catalina]
03-Jun-2020 10:31:31.080 信息 [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.5.55
03-Jun-2020 10:31:31.089 信息 [main] org.apache.coyote.AbstractProtocol.start 開始協議處理句柄["http-nio-8080"]
03-Jun-2020 10:31:31.102 信息 [main] org.apache.catalina.startup.Catalina.start Server startup in 47 ms

tomat啟動主要是在Catalina中

然后是

啟動

/**
* Await and shutdown.
*/
public void await() {

 getServer().await();


}

其實tomcat啟動本質上就是socket的服務器罷了

@Override
public void await() {
 // Negative values - don't wait on port - tomcat is embedded or we just don't like ports
 if (port == -2) {
 // undocumented yet - for embedding apps that are around, alive.
 return;
 }
 if (port==-1) {
 try {
  awaitThread = Thread.currentThread();
  while(!stopAwait) {
  try {
   Thread.sleep( 10000 );
  } catch( InterruptedException ex ) {
   // continue and check the flag
  }
  }
 } finally {
  awaitThread = null;
 }
 return;
 }


 // Set up a server socket to wait on
 try {
 awaitSocket = new ServerSocket(port, 1,
  InetAddress.getByName(address));
 } catch (IOException e) {
 log.error("StandardServer.await: create[" + address
    + ":" + port
    + "]: ", e);
 return;
 }


 try {
 awaitThread = Thread.currentThread();


 // Loop waiting for a connection and a valid command
 while (!stopAwait) {
  ServerSocket serverSocket = awaitSocket;
  if (serverSocket == null) {
  break;
  }


  // Wait for the next connection
  Socket socket = null;
  StringBuilder command = new StringBuilder();
  try {
  InputStream stream;
  long acceptStartTime = System.currentTimeMillis();
  try {
   socket = serverSocket.accept(); //一旦accecpt后面就開始執行了
   socket.setSoTimeout(10 * 1000); // Ten seconds
   stream = socket.getInputStream();
  } catch (SocketTimeoutException ste) {
   // This should never happen but bug 56684 suggests that
   // it does.
   log.warn(sm.getString("standardServer.accept.timeout",
    Long.valueOf(System.currentTimeMillis() - acceptStartTime)), ste);
   continue;
  } catch (AccessControlException ace) {
   log.warn(sm.getString("standardServer.accept.security"), ace);
   continue;
  } catch (IOException e) {
   if (stopAwait) {
   // Wait was aborted with socket.close()
   break;
   }
   log.error(sm.getString("standardServer.accept.error"), e);
   break;
  }


  // Read a set of characters from the socket
  int expected = 1024; // Cut off to avoid DoS attack
  while (expected < shutdown.length()) {
   if (random == null)
   random = new Random();
   expected += (random.nextInt() % 1024);
  }
  while (expected > 0) {
   int ch = -1;
   try {
   ch = stream.read();
   } catch (IOException e) {
   log.warn(sm.getString("standardServer.accept.readError"), e);
   ch = -1;
   }
   // Control character or EOF (-1) terminates loop
   if (ch < 32 || ch == 127) {
   break;
   }
   command.append((char) ch);
   expected--;
  }
  } finally {
  // Close the socket now that we are done with it
  try {
   if (socket != null) {
   socket.close();
   }
  } catch (IOException e) {
   // Ignore
  }
  }


  // Match against our command string
  boolean match = command.toString().equals(shutdown);
  if (match) {
  log.info(sm.getString("standardServer.shutdownViaPort"));
  break;
  } else
  log.warn(sm.getString("standardServer.invalidShutdownCommand", command.toString()));
 }
 } finally {
 ServerSocket serverSocket = awaitSocket;
 awaitThread = null;
 awaitSocket = null;


 // Close the server socket and return
 if (serverSocket != null) {
  try {
  serverSocket.close();
  } catch (IOException e) {
  // Ignore
  }
 }
 }
}

tomcat容器啟動之后，下面就是Springmvc模塊的內容了

到此這篇關于Idea中tomcat啟動源碼調試進入到tomcat內部進行調試的方法的文章就介紹到這了,更多相關Idea中tocmat啟動源碼調試內容請搜索腳本之家以前的文章或繼續瀏覽下面的相關文章希望大家以后多多支持腳本之家！