Jax-rs (Java API for RESTful Web Services) Practice Tutorial IV--@Context inject httpservletrequest to keep the rest state! __java

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Jax-rs provides an annotation injection method to obtain the client's information

When the Jax-rs service is released based on the servlet , you can also inject servletconfig, ServletContext, HttpServletRequest, in the servlet through @context, HttpServletResponse

Then rest can be sessionid to hold the user's state

How to use:

Build a Web project and join the Jax-rs (jsr311) jar Package

Create a new class

@Path ("UserContext") public class UserContext {@Context uriinfo uriinfo; @Context httpheaders httpheaders; @Context secur Itycontext SC; @Context Request req; @Context Response resp; @Context httpservletresponse response; @Context HttpServletRequest request; @GET public string Hi (@QueryParam ("name") string yourName) {if (yourname!=null) request.getsession (). setattribute (" Name ", YourName); String username = (string) request.getsession (). getattribute ("name"); if (username!=null) {System.out.println (Request.getsession (). GetId () + ":" + username);} else{System.out.println (Request.getsession (). GetId () + "no user"); } }

<!--web.xml add--> <servlet> <display-name>jax-rs REST servlet</display-name> < Servlet-name>jax-rs REST servlet</servlet-name> <servlet-class> Com.sun.jersey.spi.container.servlet.servletcontainer</servlet-class> <load-on-startup>1</ load-on-startup> </servlet> <servlet-mapping> <servlet-name>jax-rs REST servlet</ Servlet-name> <url-pattern>/services/*</url-pattern> </servlet-mapping>

Deployment Department Run

Http://localhost:8080/rest/services/UserContext

Background will prompt:

A46756539d2e39cc2cffcb3fe1c99e70 No users

And then run

Http://localhost:8080/rest/services/UserContext?name=hello

Background will appear

A46756539d2e39cc2cffcb3fe1c99e70:hello