tomcat部署war包

我们会把工程打成war包部署到tomcat中，然后由容器来对其进行解压，这个过程是怎么样的呢？ 接下来我拉把这个面纱揭开看一下，tomcat源代码如下：[b]1.[/b]URL war = new URL("jar:" + (new File(docBase)).toURI().toURL() + "!/");
// Expand the WAR into the new document base directory
        JarURLConnection juc = (JarURLConnection) war.openConnection();
        juc.setUseCaches(false);
        JarFile jarFile = null;
        InputStream input = null;
        try {
            jarFile = juc.getJarFile();
            Enumeration jarEntries = jarFile.entries();
            while (jarEntries.hasMoreElements()) {
                JarEntry jarEntry = (JarEntry) jarEntries.nextElement();
                String name = jarEntry.getName();
                int last = name.lastIndexOf('/');
                if (last >= 0) {
                    File parent = new File(docBase,
                                           name.substring(0, last));
                    parent.mkdirs();
                }
                if (name.endsWith("/")) {
                    continue;
                }
                input = jarFile.getInputStream(jarEntry);

                // Bugzilla 33636
                File expandedFile = expand(input, docBase, name);
                long lastModified = jarEntry.getTime();
                if ((lastModified != -1) && (lastModified != 0) && (expandedFile != null)) {
                    expandedFile.setLastModified(lastModified);
                }

                input.close();
                input = null;
            }
        } catch (IOException e) {
            // If something went wrong, delete expanded dir to keep things 
            // clean
            deleteDir(docBase);
            throw e;
        } finally {
            if (input != null) {
                try {
                    input.close();
                } catch (Throwable t) {
                    ;
                }
                input = null;
            }
            if (jarFile != null) {
                try {
                    jarFile.close();
                } catch (Throwable t) {
                    ;
                }
                jarFile = null;
            }
        }

[b]2.[/b]熟悉tomcat的兄弟都知道，容器在启动的时候其实执行的是两个过程，第一：初始化，第二：启动过程； 而就是在启动HOST的过程中，触发一个start事件，lifecycle.fireLifecycleEvent(START_EVENT, null);
执行到HostConfig类的lifecycleEvent方法中，然后执行start()方法，deployApps方法  —》deployWARs(appBase, appBase.list()); 然后执行到StandardHost的addChild方法  启动StandardContext类的start方法，init方法， fixDocBase()方法，在这个类里会调用ExpandWar.expand(host, war, contextPath);来进行war包的解压,就到此为止，