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第 48 章 Spring Integration

48.1. Basic Integration
48.2. Customized Configuration
48.3. Spring MVC Integration
48.4. Undertow Embedded Spring Container
48.5. Processing Spring Web REST annotations in RESTEasy
48.6. Spring Boot starter
48.7. Upgrading in WildFly

RESTEasy integrates with Springframework in various forms. In this chapter we introduce different methods to integrate Springframework with RESTEasy.

RESTEasy currently supports Spring version 5.2.0.RELEASE

For Maven users, you must use the resteasy-spring artifact. And here is the dependency you should use:

<dependency>
    <groupId>org.jboss.resteasy</groupId>
    <artifactId>resteasy-spring</artifactId>
    <version>4.7.0-SNAPSHOT</version>
</dependency>

RESTEasy comes with its own ContextLoaderListener that registers a RESTEasy specific BeanPostProcessor that processes JAX-RS annotations when a bean is created by a BeanFactory. And it will automatically scan for @Provider and JAX-RS resource annotations on your bean class and register them as JAX-RS resources.

Here is the content that you should add into your web.xml file:

<listener>
    <listener-class>org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap</listener-class>
</listener>

<listener>
    <listener-class>org.jboss.resteasy.plugins.spring.SpringContextLoaderListener</listener-class>
</listener>

Please note that the SpringContextLoaderListener must be declared after ResteasyBootstrap as it uses ServletContext attributes initialized by it.

And you can configure the Springframework to scan for the JAX-RS resources and beans in a Spring configuration file. The content of the file is shown as follow:

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd

		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <context:component-scan base-package="org.jboss.resteasy.examples.springbasic">
        <context:include-filter type="annotation" expression="javax.ws.rs.Path"/>
    </context:component-scan>
    <context:annotation-config/>

</beans>

Let's say the above file is named resteasy-spring-basic.xml, then in your web.xml the can be configured like this:

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:resteasy-spring-basic.xml</param-value>
</context-param>

In addition, you need to configure your RESTEasy servlet in web.xml. Here is the example:

<servlet>
    <servlet-name>Resteasy</servlet-name>
    <servlet-class>org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>Resteasy</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>

Instead of using HttpServletDispatcher for deployment, you can also use the FilterDispatcher in web.xml:

<filter>
    <filter-name>resteasy-filter</filter-name>
    <filter-class>
        org.jboss.resteasy.plugins.server.servlet.FilterDispatcher
    </filter-class>
</filter>

To see a complete example of the above basic usage, please check the Basic Example we provided.

If you do not want to use the SpringContextLoaderListener provided by RESTEasy, and want to create your bean factories, then you can manually register the RESTEasy BeanFactoryPostProcessor by creating an instance of the RESTEasy SpringBeanProcessor.

And you must configure the RestasyBootstrap into the scope to create the ResteasyDeployment so the relative classes can be fetched from ServletContext.

There is also a SpringBeanProcessorServletAware class that implements the ServletContextAware interface provided by Springframework. The SpringBeanProcessorServletAware can be used to fetch the Registry and ResteasyProviderFactory from the ServletContext.

To demonstrate the above process, we have also provide an example. Please check the Spring and Resteasy Customized Example we provided.

Our Spring integration supports both singletons and the "prototype" scope. RESTEasy handles injecting @Context references. Constructor injection is not supported though. Also, with the "prototype" scope, RESTEasy will inject any @*Param annotated fields or setters before the request is dispatched.

NOTE: You can only use auto-proxied beans with our base Spring integration. You will have undesirable affects if you are doing handcoded proxying with Spring, i.e., with ProxyFactoryBean. If you are using auto-proxied beans, you will be ok.

RESTEasy can also integrate with the Spring MVC framework. Generally speaking, JAX-RS can be combined with a Spring DispatcherServlet and used in the same web application.

An application combined in this way allows you to dispatch to either the Spring controller or the JAX-RS resource using the same base URL. In addition you can use the Spring ModelAndView objects as return arguments from @GET resource methods.

The setup requires you to use the Spring DispatcherServlet in your web.xml file, as well as importing the springmvc-resteasy.xml file into your base Spring beans xml file. Here's an example web.xml file:

<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <display-name>resteasy-spring-mvc</display-name>

    <servlet>
        <servlet-name>resteasy-spring-mvc</servlet-name>
        <servlet-class>org.jboss.resteasy.springmvc.ResteasySpringDispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:resteasy-spring-mvc-servlet.xml</param-value>
        </init-param>
    </servlet>

    <servlet-mapping>
        <servlet-name>resteasy-spring-mvc</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>

</web-app>

Then within the resteasy-spring-mvc-servlet.xml, it should import the springmvc-resteasy.xml file:

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
    http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.5.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
">

    <!-- Import basic SpringMVC RESTEasy integration -->
    <import resource="classpath:springmvc-resteasy.xml"/>
....

And then you need to tell Spring the package to scan for your JAX-RS resource classes:

<context:component-scan base-package="org.jboss.resteasy.examples.springmvc"/>
<context:annotation-config/>

Above is the basic configuration for Spring MVC framework. To see a complete example, please check the Spring MVC Integration Example we provided.

In addition, A javax.ws.rs.core.Application subclass can be combined with a Spring DispatcherServlet and used in the same web application.

A servlet definition is required for both the Spring DispatcherServlet and the javax.ws.rs.core.Application subclass in the web.xml, as well as RESTEasy Configuration Switch, resteasy.scan.resources. Here is an example of the minimum configuration information needed in the web.xml.

<web-app>
    <servlet>
        <servlet-name>mySpring</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>mySpring</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>

    <servlet>
        <servlet-name>myAppSubclass</servlet-name>
        <servlet-class>org.my.app.EntryApplicationSubclass</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>myAppSubclass</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>

    <!-- required RESTEasy Configuration Switch directs auto scanning
         of the archive for JAX-RS resource files
    -->
    <context-param>
        <param-name>resteasy.scan.resources</param-name>
        <param-value>true</param-value>
    </context-param>
</web-app>

Note that RESTEasy parameters like resteasy.scan.resources may be set in a variety of ways. See 第 3.4 节 “配置” for more information about application configuration.

If your web application contains JAX-RS provider classes the RESTEasy Configuration Switch, resteasy.scan.providers, will also be needed. And if the url-pattern for the JAX-RS Application subclass is other than /* you will need to declare the RESTEasy Configuration Switch, resteasy.servlet.mapping.prefix. This switch can be declare either as a context-param or as a servlet init-param. It's value must be the text that preceeds the /*. Here is an example of such a web.xml:

<web-app>
    <servlet>
        <servlet-name>spring</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>spring</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>

    <servlet>
        <servlet-name>myAppSubclass</servlet-name>
        <servlet-class>org.my.app.EntryApplicationSubclass</servlet-class>

        <init-param>
            <param-name>resteasy.servlet.mapping.prefix</param-name>
            <param-value>/resources</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>myAppSubclass</servlet-name>
        <url-pattern>/resources/*</url-pattern>
    </servlet-mapping>

    <context-param>
        <param-name>resteasy.scan.resources</param-name>
        <param-value>true</param-value>
    </context-param>
    <context-param>
        <param-name>resteasy.scan.providers</param-name>
        <param-value>true</param-value>
    </context-param>
</web-app>

Above are the usages of RESTEasy Spring MVC integration usages.

We provide a undertow-based embedded spring container module, called "resteasy-undertow-spring". To use it, you need to add the following additional dependencies into your project:

<dependency>
  <groupId>org.jboss.resteasy</groupId>
  <artifactId>resteasy-undertow</artifactId>
  <scope>test</scope>
</dependency>
<dependency>
  <groupId>org.jboss.resteasy</groupId>
  <artifactId>resteasy-undertow-spring</artifactId>
  <scope>test</scope>
</dependency>

In the "resteasy-undertow-spring" module, we have a embedded server class called "UndertowJaxrsSpringServer". In its "undertowDeployment(...)" method, it will accept the spring context configuration file:

public DeploymentInfo undertowDeployment(String contextConfigLocation, String mapping)

We can provide a minimal spring config like the following:

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation="
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.5.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        ">
    <context:component-scan base-package="org.jboss.resteasy.springmvc.test"/>
    <context:annotation-config/>
    <import resource="classpath:springmvc-resteasy.xml"/>
</beans>

In above configuration, the "springmvc-resteasy.xml" in the classpath is provided by the "resteasy-spring" module by default. Let's name the above configuration file with "spring-servlet.xml", and the following code will include it and setup the UndertowJaxrsSpringServer and start it:

UndertowJaxrsSpringServer server = new UndertowJaxrsSpringServer();
server.start();

DeploymentInfo deployment = server.undertowDeployment("classpath:spring-servlet.xml", null);
deployment.setDeploymentName(BasicSpringTest.class.getName());
deployment.setContextPath("/");
deployment.setClassLoader(BasicSpringTest.class.getClassLoader());

server.deploy(deployment);

Above is the code example to setup and start UndertowJaxrsSpringServer. To see a complete example, please check the Demo Of Undertow Embedded Spring Container as usage example.

RESTEasy also provides the ability to process Spring Web REST annotations (i.e. Spring classes annotated with @RestController) and handle related REST requests without delegating to Spring MVC. This functionality is currently experimental.

In order for RESTEasy to be able to process Spring @RestController, you first need to include the following dependency.

<dependency>
    <groupId>org.jboss.resteasy</groupId>
    <artifactId>resteasy-spring-web</artifactId>
    <version>4.7.0-SNAPSHOT</version>
</dependency>

Currently RESTEasy does not auto-scan for @RestController annotated classes, so you need to add all @RestController annotated classes to your web.xml file as shown in the following example.

<web-app>
   <display-name>RESTEasy application using Spring REST annotations</display-name>

    <context-param>
        <param-name>resteasy.scanned.resource.classes.with.builder</param-name>
        <param-value>org.jboss.resteasy.spi.metadata.SpringResourceBuilder:org.example.Controller1,org.example.Controller2</param-value>
    </context-param>

   ...
</web-app>

In the example above, Controller1 and Controller2 are registered and are expected to be annotated with @RestController.

The list of the currently supported annotations can be found below:


Furthermore, the use of org.springframework.http.ResponseEntity as a return value is supported as is the use of javax.servlet.http.HttpServletRequest and javax.servlet.http.HttpServletResponse as method parameters.

To see an example of the usage, please check the RESTEasy support of Spring REST annotations sample project we provided.

The RESTEasy project has its support for Spring Boot integration. It was originally developed by PayPal team and has been donated to RESTEasy community. The project is currently maintained here: RESTEasy Spring Boot Starter Project.

Here is the usage in brief:

Firstly, add dependency to your Spring Boot application:

<dependency>
   <groupId>org.jboss.resteasy</groupId>
   <artifactId>resteasy-spring-boot-starter</artifactId>
   <version>${latest_version_of_restesy_spring_boot}</version>
   <scope>runtime</scope>
</dependency>

And then you can use Spring annotation @Component to register your JAX-RS Application class:

package com.sample.app;

import org.springframework.stereotype.Component;
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;

@Component
@ApplicationPath("/sample-app/")
public class JaxrsApplication extends Application {
}

Finally, to register JAX-RS resources and providers, just define them as Spring beans, and they will be automatically registered. Notice that JAX-RS resources can be singleton or request scoped, while JAX-RS providers must be singletons.

To see complete examples, please check the sample-app in the project codebase.

Note. As noted in第 3.1.2 节 “升级 WildFly 中的 RESTEasy”, the RESTEasy distribution comes with a zip file called resteasy-jboss-modules-<version>.zip, which can be unzipped into the modules/system/layers/base/ directory of WildFly to upgrade to a new version of RESTEasy. Because of the way resteasy-spring is used in WildFly, after unzipping the zip file, it is also necessary to remove the old resteasy-spring jar from modules/system/layers/base/org/jboss/resteasy/resteasy-spring/main/bundled/resteasy-spring-jar.