配置Struts2後如何使用servlet

有時候,我們在配置了Struts2後還會想用servlet,但是默認是用不了的,都被struts2攔截了，並在struts.xml中匹配是否有該action

那麼,如何使用呢？

1.新建一個filter，用於過濾servlet

import java.io.IOException; 
import java.util.ArrayList; 
import java.util.Arrays; 
 
import javax.servlet.Filter; 
import javax.servlet.FilterChain; 
import javax.servlet.FilterConfig; 
import javax.servlet.RequestDispatcher; 
import javax.servlet.ServletException; 
import javax.servlet.ServletRequest; 
import javax.servlet.ServletResponse; 
import javax.servlet.http.HttpServletRequest; 
 
public class ReDispatcherFilter implements Filter { 
    private ArrayList<String> includes = new ArrayList<String>(); 
 
    @Override 
    public void destroy() { 
 
    } 
 
    @Override 
    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); 
        if (this.includes.contains(target)) { 
            RequestDispatcher rdsp = request.getRequestDispatcher(target); 
            rdsp.forward(req,resp); 
        } else 
            chain.doFilter(req, resp); 
    } 
 
    @Override 
    public void init(FilterConfig config) throws ServletException { 
        this.includes.addAll(Arrays.asList(config.getInitParameter( 
                "includeServlets").split(","))); 
    } 
 
} 

2.在web.xml中做適當配置，在struts2的配置前加上下面的代碼:

<filter> 
  <filter-name>redisp</filter-name> 
  <filter-class>com.kcjxkj.filter.ReDispatcherFilter</filter-class> 
  <init-param> 
    <param-name>includeServlets</param-name> 
    <param-value>ValidateEmail</param-value> 
  </init-param> 
 </filter> 
 <filter-mapping> 
  <filter-name>redisp</filter-name> 
  <url-pattern>/*</url-pattern> 
 </filter-mapping> 

其中,<param-value></param-value>中為web.xml中配置的要過濾的servlet名,多個之間用","逗號隔開