向Glassfish服务器添加过滤器

问题描述：

我有一个在Glassfish 3.1.2.2下部署的Java应用程序，它使用jersey来提供剩余服务。前端写在angularjs。我的web.xml如下：向Glassfish服务器添加过滤器

<web-app> 
<servlet> 
    <servlet-name>qpark rest service</servlet-name> 
    <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class> 
    <init-param> 
     <param-name>com.sun.jersey.config.property.packages</param-name> 
     <param-value>com.restfulservice.restful;org.codehaus.jackson.jaxrs</param-value> 
    </init-param> 
    <load-on-startup>1</load-on-startup> 
</servlet> 

<servlet-mapping> 
    <servlet-name>qpark rest service</servlet-name> 
    <url-pattern>/restservice/*</url-pattern> 
</servlet-mapping>  
</web-app>

前端在另一服务器（Apache）的运行。当发送从所述前端的请求GlassFish是一个错误响应如下：

No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin  'http://localhost' is therefore not allowed access.

这是因为逻辑前端和后端是由不同的服务器提供服务。为了避免这种情况，我配置了一个filter，它在响应头中添加了Access-Control-Allow-Origin。该过滤器必须在web.xml如下注册：

<servlet> 
    <servlet-name>Gateway Servlet</servlet-name> 
    <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class> 
    <init-param> 
     <param-name>com.sun.jersey.spi.container.ContainerResponseFilters</param-name> 
     <param-value>com.filters.CrossOriginResourceSharingFilter</param-value> 
    </init-param> 
    <load-on-startup>1</load-on-startup> 
</servlet>

我的问题是，我想也映射这个第二过滤器每restservice。也就是说，我想补充这样的东西

<servlet-mapping> 
    <servlet-name>Gateway Servlet</servlet-name> 
    <url-pattern>/restservice/*</url-pattern> 
</servlet-mapping>

但这是不允许的。

的问题是如何添加/合/在web.xml

答

你需要的不是一个servlet，而是一个servlet过滤器。针对接口javax.servlet.Filter实施您的servlet过滤器。使用过滤器处理请求和/或响应，向请求/响应添加或删除信息，然后将其传递给链中的下一个过滤器（如果有）。

package com.example.sample; 

import javax.servlet.Filter; 
import javax.servlet.FilterChain; 
import javax.servlet.FilterConfig; 
import javax.servlet.ServletException; 
import javax.servlet.ServletRequest; 
import javax.servlet.ServletResponse; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 

public class Sample implements Filter{ 

    @Override 
    public void destroy() { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, 
      FilterChain chain) throws IOException, ServletException { 
     // Process the request/response here. Add or remove the information you need. 
     // Add or edit the headers you want to 
     chain.doFilter(servletRequest, servletResponse);    
    } 

    @Override 
    public void init(FilterConfig arg0) throws ServletException { 


    } 
}

使用的过滤器，你需要定义，并按如下图吧web.xml中：

<!-- List of filters --> 
<filter> 
    <filter-name>Authorization Filter</filter-name> 
    <filter-class>com.example.sample.Sample</filter-class> 
</filter> 
<filter-mapping> 
    <filter-name>Sample Filter</filter-name> 
    <url-pattern>/foobar/*</url-pattern> 
</filter-mapping>

太好了！这是工作。谢谢 – Luixv 2014-11-24 13:20:50

答

Filters注册这两个滤波器可独立加w.r.t. servlets

<filter> 
    <filter-name>ContainerResponseFilter</filter-name> 
    <filter-class>com.filters.CrossOriginResourceSharingFilter</filter-class> 
    <init-param> 
     <param-name>...</param-name> 
     <param-value>42</param-value> 
    </init-param> 
</filter> 
<filter-mapping> 
    <filter-name>ContainerResponseFilter</filter-name> 
    <servlet-name>*</servlet-name> 
</filter-mapping> 
<servlet> 
    ...

向Glassfish服务器添加过滤器

相关推荐