向Glassfish服務器添加過濾器

Question

我有一個在Glassfish 3.1.2.2下部署的Java應用程序，它使用jersey來提供剩餘服務。前端寫在angularjs。我的web.xml如下：

<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> 

前端在另一服務器（Apache）的運行。當發送從所述前端的請求GlassFish是一個錯誤響應如下：

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

這是因爲邏輯前端和後端是由不同的服務器提供服務。爲了避免這種情況，我配置了一個filter，它在響應頭中添加了Access-Control-Allow-Origin。該過濾器必須在web.xml如下注冊：

<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> 

我的問題是，我想也映射這個第二過濾器每restservice。也就是說，我想補充這樣的東西

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

但這是不允許的。

的問題是如何添加/合/在web.xml

Answer 1

你需要的不是一個servlet，而是一個servlet過濾器。針對接口javax.servlet.Filter實施您的servlet過濾器。使用過濾器處理請求和/或響應，向請求/響應添加或刪除信息，然後將其傳遞給鏈中的下一個過濾器（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 { 


    } 
} 

使用的過濾器，你需要定義，並按如下圖吧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> 

Answer 2

Filters註冊這兩個濾波器可獨立加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> 
    ...