Question

我编写了一个存在业务逻辑的servlet。我将从调用我的RESTful Web服务方法的调用程序中获取一个令牌。有了这个令牌，我需要使用serlvet中编写的业务逻辑进行验证。我还映射了一个Filter，它在命中servlet之前设置了一些头值。

现在我想从RESTful Web服务方法中获取过滤器和servlet。能够以下面的方式获取ServletContext。

@Context private ServletContext servletContext;

但是如何获取HttpServletRequest，HttpServletResponse对象。因为，我需要在HttpServletRequest中设置令牌。

请提出解决方案。

提前致谢。

修改

我需要将令牌设置为Authorization Header。下面是代码。的的web.xml

<filter>
    <filter-name>HeaderFilter</filter-name>
    <filter-class>com.controller.HeaderFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>HeaderFilter</filter-name>
    <url-pattern>/dummy</url-pattern>
    <dispatcher>FORWARD</dispatcher>
    <dispatcher>INCLUDE</dispatcher>
    <dispatcher>REQUEST</dispatcher>
  </filter-mapping>

休息网络服务类

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
@Path("/service")
public class Service {
@Path("/val/{token}")   
@GET
@Produces("application/xml")

public String setToken(@Context HttpServletRequest request, @Context HttpServletResponse response, @PathParam("token") String token) throws ServletException, IOException {
    String value=token;
    if(request==null){
        System.out.println("Request null");
    }
    System.out.println("Token: " + value);
    if(request!=null){
        request.setAttribute("param", value);
        request.getRequestDispatcher("/dummy").include(request, response);
    }
    return "<token>"+ "<value>"+value+" token value"+"</value>" + "</token>";
}
}

过滤类

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest httpRequest=(HttpServletRequest)request;
    System.out.println("********Filter**********");
    HttpServletResponse httpResponse=(HttpServletResponse)response;
    if(request.getAttribute("param")!=null){
        String token=request.getAttribute("param").toString();

        System.out.println("Filter httpRequest: " + token);

        Wrapper requestWrapper = new Wrapper(httpRequest);
        requestWrapper.addHeader("Authorization", token);

        chain.doFilter(requestWrapper, response);

    }
}

Servlet类

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    ServletContext ctx=getServletContext();  
    System.out.println("Inside Dummy Servlet");

    System.out.println(request.getAttribute("param").toString());

    System.out.println("Request Header: "+response.getHeader("Authorization").toString());
}

现在可以通过在web.xml中添加以下代码来过滤。

 <filter-mapping>
<filter-name>HeaderFilter</filter-name>
<url-pattern>/dummy</url-pattern>
<dispatcher>FORWARD</dispatcher>
<dispatcher>INCLUDE</dispatcher>
<dispatcher>REQUEST</dispatcher>

但是在Author for Author中设置的值在servlet中调用时为null。我需要在HeaderFilter中的授权标题中设置令牌。我坚持这样做。

Answer 1

您使用的是jax-rs，需要使用@Context注释创建一个控制器：

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.core.Context;


@Path("helloword")
public class SampleControler {

    @GET
    public String doGetAsHtml(@Context HttpServletRequest req, @Context HttpServletResponse response) {
        req.setAttribute("my attr", "my object");
        .....
        return ...;
    }
}

这应该有效。

如何从RESTful Web服务方法调用servlet？

1 个答案: