Idea中tomcat启动源码调试进入到tomcat内部进行调试的方法
使用idea开发工具调试代码的时候，如果是java的web项目，使用的是tomcat作为web容器，打断点debug调试跟踪，当跟踪到org.apache.catalina包下的时候，则无法进入，这是因为idea运行的tomcat是通过插件的方式集成的，tomcat里面的lib包不再项目的依赖路径中，所以不能跟踪进去
首先在自己项目中被tomcat回调的接口实现类中，标记一个断点信息，通过idea启动web项目，当出现如图所示的断点信息的时候，因为断点位置标记的是tomcat回调的接口类，所以按照调用堆栈网上则是tomcat内部代码，但此时双击org.apache.catalina包下面的类名，是没有任何反应的，因为我们还没有将tomcat对应的依赖文件添加到classpath下面
添加依赖
<dependency> <groupid>org.apache.tomcat</groupid> <artifactid>tomcat-catalina</artifactid> <version>8.5.55</version> <scope>provided</scope> </dependency>
因为运行时使用的是tomcat的lib目录下面的jar文件，所以此处的scope使用provided方式
下面就可以进入到tomcat源码调试了
tomcat启动日志是怎么执行打出来的？
03-jun-2020 10:31:30.929 信息 [main] org.apache.catalina.startup.versionloggerlistener.log server.服务器版本: apache tomcat/8.5.55
03-jun-2020 10:31:30.938 信息 [main] org.apache.catalina.startup.versionloggerlistener.log 服务器构建: may 5 2020 22:10:54 utc
03-jun-2020 10:31:30.938 信息 [main] org.apache.catalina.startup.versionloggerlistener.log 服务器版本号(: 8.5.55.0
03-jun-2020 10:31:30.938 信息 [main] org.apache.catalina.startup.versionloggerlistener.log 操作系统名称: 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 架构: amd64
03-jun-2020 10:31:30.939 信息 [main] org.apache.catalina.startup.versionloggerlistener.log java 环境变量: 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虚拟机版本: 1.8.0_212-b10
03-jun-2020 10:31:30.939 信息 [main] org.apache.catalina.startup.versionloggerlistener.log jvm.供应商: 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
通过定位到 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()));
}
}
}
发现是通过键值对的方式获取的，再通过字符串全局搜索发现
但是匹配的是英文，那么中文是怎么打出来的呢？
最后通过调试发现找的是这个
类似上面的东西,调试的时候发现tocmat的东西启动还是相当多的
且看下面这个
idea tomcat启动后的数据
03-jun-2020 10:31:30.939 信息 [main] org.apache.catalina.startup.versionloggerlistener.log 命令行参数：-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 命令行参数：-djava.util.logging.manager=org.apache.juli.classloaderlogmanager
03-jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.versionloggerlistener.log 命令行参数：-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 命令行参数：-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 命令行参数：-dfile.encoding=utf-8
03-jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.versionloggerlistener.log 命令行参数：-dcom.sun.management.jmxremote=
03-jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.versionloggerlistener.log 命令行参数：-dcom.sun.management.jmxremote.port=1099
03-jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.versionloggerlistener.log 命令行参数：-dcom.sun.management.jmxremote.ssl=false
03-jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.versionloggerlistener.log 命令行参数：-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 命令行参数：-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 命令行参数：-djava.rmi.server.hostname=127.0.0.1
03-jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.versionloggerlistener.log 命令行参数：-djdk.tls.ephemeraldhkeysize=2048
03-jun-2020 10:31:30.940 信息 [main] org.apache.catalina.startup.versionloggerlistener.log 命令行参数：-djava.protocol.handler.pkgs=org.apache.catalina.webresources
03-jun-2020 10:31:30.941 信息 [main] org.apache.catalina.startup.versionloggerlistener.log 命令行参数：-dignore.endorsed.dirs=
03-jun-2020 10:31:30.941 信息 [main] org.apache.catalina.startup.versionloggerlistener.log 命令行参数：-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 命令行参数：-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 命令行参数：-djava.io.tmpdir=d:\tomcat8.5.55\apache-tomcat-8.5.55\temp
以上还只是基本的环境配置等启动
然后是准备链接到tomcat服务
03-jun-2020 10:31:30.941 信息 [main] org.apache.catalina.core.aprlifecyclelistener.lifecycleevent 使用apr版本[1.7.0]加载了基于apr的apache tomcat本机库[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 初始化协议处理器 ["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 正在启动服务[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 开始协议处理句柄["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启动主要是在catalina中
然后是
启动
/**
* await and shutdown.
*/
public void await() {
getserver().await();
}
其实tomcat启动本质上就是socket的服务器罢了
@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后面就开始执行了
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容器启动之后，下面就是springmvc模块的内容了
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