From 8f843642dc02cc428b7f466836ca67e5bda20527 Mon Sep 17 00:00:00 2001
From: qibaoguang <qibaoguang@gmail.com>
Date: Fri, 17 Apr 2015 00:29:13 +0800
Subject: [PATCH] Update 74.5. Deploying a WAR in an Old (Servlet 2.5)
 Container.md

---
 ...ing a WAR in an Old (Servlet 2.5) Container.md | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/IX. ‘How-to’ guides/74.5. Deploying a WAR in an Old (Servlet 2.5) Container.md b/IX. ‘How-to’ guides/74.5. Deploying a WAR in an Old (Servlet 2.5) Container.md
index e69de29..d190bdb 100644
--- a/IX. ‘How-to’ guides/74.5. Deploying a WAR in an Old (Servlet 2.5) Container.md	
+++ b/IX. ‘How-to’ guides/74.5. Deploying a WAR in an Old (Servlet 2.5) Container.md	
@@ -0,0 +1,46 @@
+### 74.5. 部署WAR到老的(Servlet2.5)容器
+
+Spring Boot使用 Servlet 3.0 APIs初始化ServletContext（注册Servlets等），所以你不能在一个Servlet 2.5的容器中原封不动的使用同样的应用。使用一些特定的工具也是可以在一个老的容器中运行Spring Boot应用的。如果添加了`org.springframework.boot:spring-boot-legacy`依赖，你只需要创建一个web.xml，声明一个用于创建应用上下文的上下文监听器，过滤器和servlets。上下文监听器是专用于Spring Boot的，其他的都是一个Servlet 2.5的Spring应用所具有的。示例：
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
+
+    <context-param>
+        <param-name>contextConfigLocation</param-name>
+        <param-value>demo.Application</param-value>
+    </context-param>
+
+    <listener>
+        <listener-class>org.springframework.boot.legacy.context.web.SpringBootContextLoaderListener</listener-class>
+    </listener>
+
+    <filter>
+        <filter-name>metricFilter</filter-name>
+        <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
+    </filter>
+
+    <filter-mapping>
+        <filter-name>metricFilter</filter-name>
+        <url-pattern>/*</url-pattern>
+    </filter-mapping>
+
+    <servlet>
+        <servlet-name>appServlet</servlet-name>
+        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
+        <init-param>
+            <param-name>contextAttribute</param-name>
+            <param-value>org.springframework.web.context.WebApplicationContext.ROOT</param-value>
+        </init-param>
+        <load-on-startup>1</load-on-startup>
+    </servlet>
+
+    <servlet-mapping>
+        <servlet-name>appServlet</servlet-name>
+        <url-pattern>/</url-pattern>
+    </servlet-mapping>
+
+</web-app>
+```
+在该示例中，我们使用一个单一的应用上下文（通过上下文监听器创建的），然后使用一个init参数将它附加到DispatcherServlet。这在一个Spring Boot应用中是很正常的（你通常只有一个应用上下文）。