如何让struts2和servlet的共存
2016-02-17 09:01
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如何让struts2和servlet的共存
(2013-08-29 14:07:49)转载▼
标签:servlet与struts2共存同时配置struts2与serservlet访问不到 | 分类: Struts2 |
先让我们看下web.xml中struts2和servlet的配置:
<!-- struts2拦截页面请求的配置 -->
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- servlet的配置 -->
<servlet>
<servlet-name>ImageServlet</servlet-name>
<servlet-class>com.servlets.ImageServlet
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ImageServlet</servlet-name>
<url-pattern>/myImageServlet/*</url-pattern>
</servlet-mapping>
当我们在页面在请求应用时,struts2将会截获所有请求,对于servlet请求将不能够正常响应的(报错信息为:HTTP Status 404 - There is no Action mapped for namespace / and action name myImageServlet.),
这是因为struts2把servlet当成action了,因为servlet和action都是没有后缀的.
二、解决方案
解决方法目前有四种:
方法1:
统一在servlet后面加上.servlet结尾(包括web.xml配置文件中和页面上使用servlet的地方)
方法2(比较通用奥):
在struts.xml中的<struts>的节点下面添加struts2处理的请求后缀 常量:
<!--
该属性指定需要Struts 2处理的请求后缀,该属性的默认值是action,即所有匹配*.action的请求都由Struts 2处理。如果用户需要指定多个请求后缀,则多个后缀之间以英文逗号(,)隔开。
-->
<constant name="struts.action.extension" value="action" />
方法3:
在web.xml中修改struts2拦截页面请求的配置:
原:
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
现:
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/user/*</url-pattern>
</filter-mapping>
servlet的请求路径不必改变
方法4:
自定义filter对servlet进行过滤:
##############################################
# 该类是定义了一个过滤器(随便你放在摸个包下面),当既用到struts2有用到servlet时,
# 必须用该过滤器对所有的servlet做一次过滤,否则servlet将无法正常运行。
# 同时在web.xml中,在定义struts的核心控制器的过滤器前面添加该过滤器,添加代码如下:
* <filter>
* <filter-name>redisp</filter-name>
* <filter-class>filters.ReDispatcherFilter(该过滤器的类名)</filter-class>
* <init-param>
* <param-name>includeServlets</param-name>
* <param-value>所配置的servlet,注意是那url-pattern</param-value>
* </init-param>
* </filter>
* <filter-mapping>
* <filter-name>redisp</filter-name>
* <url-pattern>/*</url-pattern>
* </filter-mapping>
*该类也可以直接继承StrutsPrepareAndExecuteFilter的
###########################################################
public class ReDispatcherFilter implements Filter {
public void destroy() {
// TODO Auto-generated method stub
}
public void doFilter(ServletRequest req, ServletResponse resp,
FilterChain chain) throws IOException, ServletException
{
HttpServletRequest request = (HttpServletRequest)req;
String target = request.getRequestURI();
target = target.lastIndexOf("?")>0
?target.substring(target.lastIndexOf("/")+1,target.lastIndexOf("?")-target.lastIndexOf("/"))
:target.substring(target.lastIndexOf("/")+1);
System.out.println(target);
if(this.includes.contains(target))
{
RequestDispatcher rdsp = request.getRequestDispatcher(target);
System.out.println("go..............."+rdsp);
rdsp.forward(req, resp);
}
else
chain.doFilter(req, resp);
}
private ArrayList<String> includes = new ArrayList<String>();
public void init(FilterConfig config) throws ServletException {
this.includes.addAll( Arrays.asList(config.getInitParameter("includeServlets").split(",")));
}
}
怕大家还是配置错误,给一个web.xml的配置实例。
<filter>
<filter-name>redisp</filter-name>
<filter-class>
com.xheditor.servlet.ReDispatcherFilter</filter-class>
<init-param>
<param-name>includeServlets</param-name>
<param-value>UploadFileServlet</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>redisp</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- struts2拦截页面请求的配置 -->
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- servlet的配置 -->
<servlet>
<servlet-name>ImageServlet</servlet-name>
<servlet-class>com.servlets.ImageServlet
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ImageServlet</servlet-name>
<url-pattern>/myImageServlet/*</url-pattern>
</servlet-mapping>
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