RESTEasy常用部署方式和配置

这里的文章参考RESTEasy官方文档，只是对相应的部分进行了汉化，英语不错的同学可以直接参考官方文档。以下配置代码都是在web.xml中。

>>最小配置模式：

<web-app>
    <display-name>Archetype Created Web Application</display-name>

    <servlet>
        <servlet-name>Resteasy</servlet-name>
        <servlet-class>
            org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
        </servlet-class>
        <init-param>
            <param-name>javax.ws.rs.Application</param-name>
            <param-value>org.jboss.resteasy.examples.service.LibraryApplication</param-value>
        </init-param>
    </servlet>

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

</web-app>

以上代码中的

        <init-param>
            <param-name>javax.ws.rs.Application</param-name>
            <param-value>com.restfully.shop.services.ShoppingApplication</param-value>
        </init-param>

可以删除，然后在web.xml中添加<context-param>。如：

   <context-param>
      <param-name>javax.ws.rs.Application</param-name>
      <param-value>org.jboss.resteasy.examples.service.LibraryApplication</param-value>
   </context-param>

>>修改url-pattern。这里对应的url-pattern是/*，如果需要改成/aaa/bbb/*，则需要相应的改变配置：

   <context-param>
      <param-name>javax.ws.rs.Application</param-name>
      <param-value>org.jboss.resteasy.examples.service.LibraryApplication</param-value>
   </context-param>

   <context-param>
      <param-name>resteasy.servlet.mapping.prefix</param-name>
      <param-value>/aaa/bbb</param-value>
   </context-param>
   
    <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>/aaa/bbb/*</url-pattern>
    </servlet-mapping>

>>通过Listener启动RESTEasy。这种情况通常用于想在系统启动时立即使用RESTEasy的功能。常见的情况是在另一个Listener中要使用RESTEasy。

<context-param>
      <param-name>javax.ws.rs.Application</param-name>
      <param-value>org.jboss.resteasy.examples.service.LibraryApplication</param-value>
   </context-param>

   <context-param>
      <param-name>resteasy.servlet.mapping.prefix</param-name>
      <param-value>/aaa/bbb</param-value>
   </context-param>
   
   <listener>
      <listener-class>
         org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
      </listener-class>
   </listener>
   
    <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>/aaa/bbb/*</url-pattern>
    </servlet-mapping>

>>使用Filter配置RESTEasy。通常使用servlet配置时，在相同的路径下不能再有静态资源文件。因为那样的请求会被当作一个service路径来处理。同时如果指定路径下没有相应的service对应，RESTEasy还能委派一个基础的service来处理。

    <filter>
        <filter-name>Resteasy</filter-name>
        <filter-class>
            org.jboss.resteasy.plugins.server.servlet.FilterDispatcher
        </filter-class>
        <init-param>
            <param-name>javax.ws.rs.Application</param-name>
            <param-value>com.restfully.shop.services.ShoppingApplication</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>Resteasy</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

>>在Jboss7中配置。由于RESTEasy 已经完全集成在Jboss7中，所以只需要保证项目中有一个web.xml文件即可，空文件都行。同样上面的一些<context-param>可以在此web.xml中使用。但注意的是，因为这里没有使用JAX-RS Servlet来映射URL地址，所以需要额外使用@ApplicationPath来配置。

import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;

@ApplicationPath("/root-path")
public class MyApplication extends Application {
}

这里如果你没有指定一些classes 或者 singletons，系统会自动扫描所有包含resource 和provider JAX-RS 注解的类。

一个完整的Application实现通常是这样的：

import javax.ws.rs.core.Application;
import java.util.HashSet;
import java.util.Set;

public class ShoppingApplication extends Application {
   private Set<Object> singletons = new HashSet<Object>();
   private Set<Class<?>> empty = new HashSet<Class<?>>();

   public ShoppingApplication() {
      singletons.add(new CustomerResource());
   }

   @Override
   public Set<Class<?>> getClasses() {
      return empty;
   }

   @Override
   public Set<Object> getSingletons() {
      return singletons;
   }
}

>>常用注册resources的模式：

<!-- 1. 使用手动指定Application的模式。
   <context-param>
      <param-name>javax.ws.rs.Application</param-name>
      <param-value>org.jboss.resteasy.examples.service.LibraryApplication</param-value>
   </context-param> 
-->
  <!-- 2. 使用自动Scan的模式 
 <context-param>
     <param-name>resteasy.scan</param-name>
     <param-value>true</param-value>
  </context-param>
  -->
  <!-- 3. 使用手动注册resources的模式 -->
  <context-param>
     <param-name>resteasy.resources</param-name>
     <param-value>org.jboss.resteasy.examples.service.MyFormService,org.jboss.resteasy.examples.service.Library</param-value>
  </context-param>

>>常用的<context-param>配置参数和说明：

Option Name Default Value Description

resteasy.servlet.mapping.prefix	no default	If the url-pattern for the Resteasy servlet-mapping is not /*
resteasy.scan	false	Automatically scan WEB-INF/lib jars and WEB-INF/classes directory for both @Provider and JAX-RS resource classes (@Path, @GET, @POST etc..) and register them
resteasy.scan.providers	false	Scan for @Provider classes and register them
resteasy.scan.resources	false	Scan for JAX-RS resource classes
resteasy.providers	no default	A comma delimited list of fully qualified @Provider class names you want to register
resteasy.use.builtin.providers	true	Whether or not to register default, built-in @Provider classes. (Only available in 1.0-beta-5 and later)
resteasy.resources	no default	A comma delimited list of fully qualified JAX-RS resource class names you want to register
resteasy.jndi.resources	no default	A comma delimited list of JNDI names which reference objects you want to register as JAX-RS resources
javax.ws.rs.Application	no default	Fully qualified name of Application class to bootstrap in a spec portable way
resteasy.media.type.mappings	no default	Replaces the need for an Accept header by mapping file name extensions (like .xml or .txt) to a media type. Used when the client is unable to use a Accept header to choose a representation (i.e. a browser). See JAX-RS Content Negotiation chapter for more details.
resteasy.language.mappings	no default	Replaces the need for an Accept-Language header by mapping file name extensions (like .en or .fr) to a language. Used when the client is unable to use a Accept-Language header to choose a language (i.e. a browser). See JAX-RS Content Negotiation chapter for more details
resteasy.document.expand.entity.references	true	Expand external entities in org.w3c.dom.Document files

RESTEasy常用部署方式和配置

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