使用idea開發(fā)工具調(diào)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(diào)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(diào)的接口實現(xiàn)類中，標記一個斷點信息，通過idea啟動web項目，當出現(xiàn)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(diào)的接口類，所以按照調(diào)用堆棧網(wǎng)上則是tomcat內(nèi)部代碼，但此時雙擊org.apache.catalina包下面的類名，是沒有任何反應(yīng)的，因為我們還沒有將tomcat對應(yīng)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(diào)試了

tomcat啟動日志是怎么執(zhí)行打出來的？

03-Jun-2020 10:31:30.929 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Server.服務(wù)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(wù)器構(gòu)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(wù)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(tǒng)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(gòu): amd64
03-Jun-2020 10:31:30.939 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Java 環(huán)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(yīng)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(fā)現(xiàn)是通過鍵值對的方式獲取的，再通過字符串全局搜索發(fā)現(xiàn)

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(diào)試發(fā)現(xiàn)找的是這個

類似上面的東西,調(diào)試的時候發(fā)現(xiàn)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(shù)據(jù)

03-Jun-2020 10:31:30.939 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數(shù)：-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(shù)：-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(shù)：-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(shù)：-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(shù)：-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(shù)：-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(shù)：-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(shù)：-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(shù)：-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(shù)：-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(shù)：-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(shù)：-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(shù)：-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(shù)：-Dignore.endorsed.dirs=
03-Jun-2020 10:31:30.941 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log 命令行參數(shù)：-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(shù)：-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(shù)：-Djava.io.tmpdir=D:\tomcat8.5.55\apache-tomcat-8.5.55\temp

以上還只是基本的環(huán)境配置等啟動
然后是準備鏈接到tomcat服務(wù)

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(xié)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(wù)[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(xié)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(zhì)上就是socket的服務(wù)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(zhí)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(nèi)容了

到此這篇關(guān)于Idea中tomcat啟動源碼調(diào)試進入到tomcat內(nèi)部進行調(diào)試的方法的文章就介紹到這了,更多相關(guān)Idea中tocmat啟動源碼調(diào)試內(nèi)容請搜索本站以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持本站！

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