tomcat初始化类加载.docx

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tomcat初始化类加载.docx

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tomcat初始化类加载.docx

tomcat初始化类加载

Tomcat解析之初始化类加载器（截图）

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Tomcat解析之初始化类加载器（截图）

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∙gogole_09

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213

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杭州

发表时间：

2010-01-30 最后修改：

2010-02-01

<>猎头职位:

上海:

【上海】外资企业高新诚聘web开发工程师

∙Tomcat5.5.26源代码分析——启动过程

（二）

∙Tomcat源代码分析之ClassLoader

∙《HowTomcatWorks》翻译（7）之Tomcat类加载器续集

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Java综合

之前有写过关于tomcat中常用的一些类结构的文章。

解析Tomcat之HttpServlet（截图记录）

今天来关注一下，tomcat的类加载器相关的内容。

PS:

由于前一篇文章内容比较简单，有朋友冠以我标题党之嫌，对于此种说法，本人深感抱歉，可能标题确实有点大，但是这些常用的类，我更多的时候只关注其用法，而忽略了内部实现，所以也就把这些内容总结了一下，发了出来。

别无标题党之意，请各位eyer海涵。

OK，现在进入正题.Tomcat类加载器初始化.

开始之前，我们首先需要了解一下几个基本的知识点；

1.tomcat中类加载器的结构与关系。

这里，我引用tomcat文档的一个简图来说明一下，有兴趣深究的朋友，可以去翻看tomcat的文档，理解更多信息.

（tomcat5.5）

（由于参考的是tomcat6.0的源代码，这里纠正一下类加载器的图（如下），以免给别的朋友造成误解，同时也多谢asialee给出的提醒）

（tomcat6.0）

2.每种类加载器分别加载什么资源：

这些内容，可以在tomcat文档的 ClassLoaderHOW-TO找到.

这里我要说明的是，在tomcat中，这些内容是记录在哪里的。

既（程序怎么让tomcat知道，需要加载哪些类）

答案是-----

其通过一个配置文件来指定的：

（catalina.properties）,这个文件默认存放在

tomcat路径下的bin/bootstrap.jar中。

如图

打开文件，其内容如下：

Java代码

1.# Licensed to the Apache Software Foundation （ASF） under one or more

2.# contributor license agreements. See the NOTICE file distributed with

3.# this work for additional information regarding copyright ownership.

4.# The ASF licenses this file to You under the Apache License, Version 2.0

5.# （the "License"）; you may not use this file except in compliance with

6.# the License. You may obtain a copy of the License at

7.#

8.# /LICENSE-2.0

9.#

10.# Unless required by applicable law or agreed to in writing, software

11.# distributed under the License is distributed on an "AS IS" BASIS,

12.# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

13.# See the License for the specific language governing permissions and

14.# limitations under the License.

15.#

16.# List of comma-separated packages that start with or equal this string

17.# will cause a security exception to be thrown when

18.# passed to checkPackageAccess unless the

19.# corresponding RuntimePermission （"accessClassInPackage."+package） has

20.# been granted.

21.package.access=sun.,,,,,sun.beans.

22.#

23.# List of comma-separated packages that start with or equal this string

24.# will cause a security exception to be thrown when

25.# passed to checkPackageDefinition unless the

26.# corresponding RuntimePermission （"defineClassInPackage."+package） has

27.# been granted.

28.#

29.# by default, no packages are restricted for definition, and none of

30.# the class loaders supplied with the JDK call checkPackageDefinition.

31.#

32.package.definition=sun.,java.,,,,

33.#

34.#

35.# List of comma-separated paths defining the contents of the "common"

36.# classloader. Prefixes should be used to define what is the repository type.

37.# Path may be relative to the CATALINA_HOME or CATALINA_BASE path or absolute.

38.# If left as blank,the JVM system loader will be used as Catalina's "common"

39.# loader.

40.# Examples:

41.# "foo":

Add this folder as a class repository

42.# "foo/*.jar":

Add all the JARs of the specified folder as class

43.# repositories

44.# "foo/bar.jar":

Add bar.jar as a class repository

45.common.loader=${catalina.home}/lib,${catalina.home}/lib/*.jar

46.#

47.# List of comma-separated paths defining the contents of the "server"

48.# classloader. Prefixes should be used to define what is the repository type.

49.# Path may be relative to the CATALINA_HOME or CATALINA_BASE path or absolute.

50.# If left as blank, the "common" loader will be used as Catalina's "server"

51.# loader.

52.# Examples:

53.# "foo":

Add this folder as a class repository

54.# "foo/*.jar":

Add all the JARs of the specified folder as class

55.# repositories

56.# "foo/bar.jar":

Add bar.jar as a class repository

57.server.loader=

58.#

59.# List of comma-separated paths defining the contents of the "shared"

60.# classloader. Prefixes should be used to define what is the repository type.

61.# Path may be relative to the CATALINA_BASE path or absolute. If left as blank,

62.# the "common" loader will be used as Catalina's "shared" loader.

63.# Examples:

64.# "foo":

Add this folder as a class repository

65.# "foo/*.jar":

Add all the JARs of the specified folder as class

66.# repositories

67.# "foo/bar.jar":

Add bar.jar as a class repository

68.# Please note that for single jars, e.g. bar.jar, you need the URL form

69.# starting

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