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  • Jersey MVC

    Jersey是JAX-RS（JavaAPI for RESTful Service）标准的一个实现，用于开发RESTful Web Application。可以参考JAX-RS的介绍（http://www.cnblogs.com/pixy/p/4838268.html），其中的用法适用于JAX-RS标准的所有实现版本。

    本文只介绍Jersey MVC的使用。

    Jersey定义了一个Viewable的类，当资源方法返回的是Viewable对象时，就代表我们想要把结果转换成视图（MVC模式）。也就是说资源方法可以当成Controller，根据请求生成Model，再分发到View去做呈现。如果想选择一个轻量级的MVC框架，有不想用Servlet当作Controller，Jersey也是一个好的选择。

    传统的MVC模式

    Jersery用作MVC的模式

    使用Jersey MVC

    1.添加依赖

    Jersey目前提供了JSP和FreeMarker两种模板引擎。Maven中配置如下依赖

    <dependency>
    <groupId>org.glassfish.jersey.ext</groupId>
    <artifactId>jersey-mvc</artifactId>
    <version>2.5</version>
</dependency>
<dependency>
    <groupId>org.glassfish.jersey.ext</groupId>
    <artifactId>jersey-mvc-jsp</artifactId>
    <version>2.5</version>
</dependency>

    2.配置Web.xml

    <web-app 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"
        version="3.0">
    <display-name>Jersey MVC Sample</display-name>
 
    <!-- Jersey -->
　　  <servlet>
　　　　<servlet-name>Jersey Web Application</servlet-name>
　　　　<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
　　　　<init-param>
　　　　　　<param-name>javax.ws.rs.Application</param-name>
　　　　　　<param-value>com.pwrd.mobileqa.assist.config.MyApplication</param-value>
　　　　</init-param>
　　　　<load-on-startup>1</load-on-startup>
　　  </servlet>
　　  <servlet-mapping>
　　 　　  <servlet-name>Jersey Web Application</servlet-name>
　　　　　 <url-pattern>/api/*</url-pattern>
　　  </servlet-mapping>
</web-app>

    有文章说需要以filter的方式配置Jersery才能集成MVC，不过我按servlet的方式配置也没有遇到问题。 

    3.自定义Application类，添加有关MVC的设置

    JspMvcFeatrue用来描述要使用Jersey MVC特性，并且使用的是JSP模板引擎。JspMvcFeatrue.TEMPLATES_BASE_PATH配置了JSP的root路径，构建Viewable视图时会该路径中查找template。

    package tw.com.codedata.jersey;
 
import org.glassfish.jersey.server.ResourceConfig;
import org.glassfish.jersey.server.mvc.jsp.JspMvcFeature;
 
public class MyApplication extends ResourceConfig{
    public MyApplication(){
        packages("tw.com.codedata.jersey.controller");
        register(JspMvcFeature.class);
        property(JspMvcFeature.TEMPLATES_BASE_PATH, "/WEB-INF/jsp");
    }
}

    4.然后就是实现资源方法（返回Viewable对象）和实现JSP页

    @Path("/hello")
public class HelloController {
    @GET
    public Viewable sayHello(@QueryParam("name") @DefaultValue("World") String name) {
        HashMap model = new HashMap();
        model.put("name", name);               
        return new Viewable("/hello", model);
    }

    　　//使用Template注解的方式
    　　@GET
　　@Template(name    ="/index.jsp")
　　@Produces("text/html")
　　public String[] list() {
      String[] macs= new String[]{"aaaa","bbbb"} ;
   }
}
    <%@page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
　　<head>   
　　</head>
　　<body>
　　　　Hello, <c:out value="${it.name}" /> 
　　</body>
</html>

    参考资料

    　　http://www.codedata.tw/java/java-restful-3-jersey-mvc/

    　　https://jersey.java.net/documentation/latest/user-guide.html#mvc

    下面附上官方文档中的详细讲解

    ----------------------------

    Chapter 20. MVC Templates

    Table of Contents

    20.1. Viewable
    20.2. @Template
    20.2.1. Annotating Resource methods
    20.2.2. Annotating Resource classes
    20.3. Absolute vs. Relative template reference
    20.3.1. Relative template reference
    20.3.2. Absolute template reference
    20.4. Handling errors with MVC
    20.4.1. MVC & Bean Validation
    20.5. Registration and Configuration
    20.6. Supported templating engines
    20.6.1. Mustache
    20.6.2. Freemarker
    20.6.3. JSP
    20.7. Writing Custom Templating Engines
    20.8. Other Examples

    Jersey provides an extension to support the Model-View-Controller (MVC) design pattern. In the context of Jersey components, the Controller from the MVC pattern corresponds to a resource class or method, the View to a template bound to the resource class or method, and the model to a Java object (or a Java bean) returned from a resource method (Controller).

    Note

    Some of the passages/examples from this chapter have been taken from MVCJ blog article written by Paul Sandoz.

    In Jersey 2, the base MVC API consists of two classes (org.glassfish.jersey.server.mvc package) that can be used to bind model to view (template), namely Viewable and@Template. These classes determine which approach (explicit/implicit) you would be taking when working with Jersey MVC templating support.

    20.1. Viewable

    In this approach a resource method explicitly returns a reference to a view template and the data model to be used. For this purpose the Viewable class has been introduced in Jersey 1 and is also present (under a different package) in Jersey 2. A simple example of usage can be seen in Example 20.1, “Using Viewable in a resource class”.

    Example 20.1. Using Viewable in a resource class

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    package com.example;
     
    @Path("foo")
    public class Foo {
     
        @GET
        public Viewable get() {
            return new Viewable("index.foo", "FOO");
        }
    }

    In this example, the Foo JAX-RS resource class is the controller and the Viewable instance encapsulates the provided data model (FOO string) and a named reference to the associated view template (index.foo).

    Tip

    All HTTP methods may return Viewable instances. Thus a POST method may return a template reference to a template that produces a view as a result of processing an HTML Form.

    20.2. @Template

    20.2.1. Annotating Resource methods

    There is no need to use Viewable every time you want to bind a model to a template. To make the resource method more readable (and to avoid verbose wrapping of a template reference and model into Viewable) you can simply annotate a resource method with @Template annotation. An updated example, using @Template, from previous section is shown in Example 20.2, “Using @Template on a resource method” example.

    Example 20.2. Using @Template on a resource method

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    package com.example;
     
    @Path("foo")
    public class Foo {
     
        @GET
        @Template("index.foo")
        public String get() {
            return "FOO";
        }
    }

    In this example, the Foo JAX-RS resource class is still the controller as in previous section but the MVC model is now represented by the return value of annotated resource method.

    The processing of such a method is then essentially the same as if the return type of the method was an instance of the Viewable class. If a method is annotated with@Template and is also returning a Viewable instance then the values from the Viewable instance take precedence over those defined in the annotation. Producible media types are for both cases, Viewable and @Template, determined by the method or class level @Produces annotation.

    20.2.2. Annotating Resource classes

    A resource class can have templates implicitly associated with it via @Template annotation. For example, take a look at the resource class listing in Example 20.3, “Using@Template on a resource class”.

    Example 20.3. Using @Template on a resource class

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    @Path("foo")
    @Template
    public class Foo {
     
        public String getFoo() {
            return "FOO";
        }
    }

    The example relies on Jersey MVC conventions a lot and requires more explanation as such. First of all, you may have noticed that there is no resource method defined in this JAX-RS resource. Also, there is no template reference defined. In this case, since the @Template annotation placed on the resource class does not contain any information, the default relative template reference index will be used (for more on this topic see Section 20.3, “Absolute vs. Relative template reference”). As for the missing resource methods, a default @GET method will be automatically generated by Jersey for the Foo resource (which is the MVC Controller now). The implementation of the generated resource method performs the equivalent of the following explicit resource method:

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    @GET
    public Viewable get() {
        return new Viewable("index", this);
    }

    You can see that the resource class serves in this case also as the model. Producible media types are determined based on the @Produces annotation declared on the resource class, if any.

    Note

    In case of "resource class"-based implicit MVC view templates, the controller is also the model. In such case the template reference index is special, it is the template reference associated with the controller instance itself.

    In the following example, the MVC controller represented by a JAX-RS @GET sub-resource method, is also generated in the resource class annotated with @Template:

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    @GET
    @Path("{implicit-view-path-parameter}")
    public Viewable get(@PathParameter("{implicit-view-path-parameter}") String template) {
        return new Viewable(template, this);
    }

    This allows Jersey to support also implicit sub-resource templates. For example, a JAX-RS resource at path foo/bar will try to use relative template reference bar that resolves to an absolute template reference /com/foo/Foo/bar.

    In other words, a HTTP GET request to a /foo/bar would be handled by this auto-generated method in the Foo resource and would delegate the request to a registered template processor supports processing of the absolute template reference /com/foo/Foo/bar, where the model is still an instance of the same JAX-RS resource class Foo.

    20.3. Absolute vs. Relative template reference

    As discussed in the previous section, both @Template and Viewable provide means to define a reference to a template. We will now discuss how these values are interpreted and how the concrete template is found.

    20.3.1. Relative template reference

    Relative reference is any path that does not start with a leading '/' (slash) character (i.e. index.foo). This kind of references is resolved into absolute ones by pre-pending a given value with a fully qualified name of the last matched resource.

    Consider the Example 20.3, “Using @Template on a resource class” from the previous section, the template name reference index is a relative value that Jersey will resolve to its absolute template reference using a fully qualified class name of Foo (more on resolving relative template name to the absolute one can be found in the JavaDoc ofViewable class), which, in our case, is:

    "/com/foo/Foo/index"

    Jersey will then search all the registered template processors (see Section 20.7, “Writing Custom Templating Engines”) to find a template processor that can resolve the absolute template reference further to a "processable" template reference. If a template processor is found then the "processable" template is processed using the supplied data model.

    Note

    If none or empty template reference is provided (either in Viewable or via @Template) then the index reference is assumed and all further processing is done for this value.

    20.3.2. Absolute template reference

    Let's change the resource GET method in our Foo resource a little:

    Example 20.4. Using absolute path to template in Viewable

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    @GET
    public Viewable get() {
        return new Viewable("/index", "FOO");
    }


    In this case, since the template reference begins with "/", Jersey will consider the reference to be absolute already and will not attempt to absolutize it again. The reference will be used "as is" when resolving it to a "processable" template reference as described earlier.

    Absolute template references start with leading '/' (i.e. /com/example/index.foo) character and are not further resolved (with respect to the resolving resource class) which means that the template is looked for at the provided path directly.

    Note, however, that template processors for custom templating engines may modify (and the supported ones do) absolute template reference by pre-pending 'base template path' (if defined) and appending template suffix (i.e. foo) if the suffix is not provided in the reference.

    For example assume that we want to use Mustache templates for our views and we have defined 'base template path' as pages. For the absolute template reference/com/example/Foo/index the template processor will transform the reference into the following path: /pages/com/example/Foo/index.mustache.

    20.4. Handling errors with MVC

    In addition to @Template a @ErrorTemplate annotation has been introduced in Jersey 2.3. The purpose of this annotation is to bind the model to an error view in case an exception has been raised during processing of a request. This is true for any exception thrown after the resource matching phase (i.e. this not only applies to JAX-RS resources but providers and even Jersey runtime as well). The model in this case is the thrown exception itself.

    Example 20.5, “Using @ErrorTemplate on a resource method” shows how to use @ErrorTemplate on a resource method. If all goes well with the method processing, then the /short-link template is used to as page sent to the user. Otherwise if an exception is raised then the /error-form template is shown to the user.

    Example 20.5. Using @ErrorTemplate on a resource method

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    @POST
    @Produces({"text/html”})
    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    @Template(name = "/short-link")
    @ErrorTemplate(name = "/error-form")
    public ShortenedLink createLink(@FormParam("link") final String link) {
        // ...
    }

    Note that @ErrorTemplate can be used on a resource class or a resource method to merely handle error states. There is no need to use @Template or Viewable with it.

    The annotation is handled by custom ExceptionMapper<E extends Throwable> which creates an instance of Viewable that is further processed by Jersey. This exception mapper is registered automatically with a MvcFeature.

    20.4.1. MVC & Bean Validation

    @ErrorTemplate can be used in also with Bean Validation to display specific error pages in case the validation of input/output values fails for some reason. Everything works as described above except the model is not the thrown exception but rather a list of ValidationErrors. This list can be iterated in the template and all the validation errors can be shown to the user in a desirable way.

    Example 20.6. Using @ErrorTemplate with Bean Validation

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    @POST
    @Produces({"text/html”})
    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    @Template(name = "/short-link”) @ErrorTemplate(name = "/error-form")
    @Valid
    public ShortenedLink createLink(@NotEmpty @FormParam("link") final String link) {
        // ...
    }

    Example 20.7. Iterating through ValidationError in JSP

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    <c:forEach items="${model}" var="error">
        ${error.message} "<strong>${error.invalidValue}</strong>"<br/>
    </c:forEach>

    Support for Bean Validation in Jersey MVC Templates is provided by a jersey-mvc-bean-validation extension module. The JAX-RS Feature provided by this module (MvcBeanValidationFeature) has to be registered in order to use this functionality (see Section 20.5, “Registration and Configuration”).

    Maven users can find this module at coordinates

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    <dependency>
        <groupId>org.glassfish.jersey.ext</groupId>
        <artifactId>jersey-mvc-bean-validation</artifactId>
        <version>2.22</version>
    </dependency>

    and for non-Maven users the list of dependencies is available at jersey-mvc-bean-validation.

    20.5. Registration and Configuration

    To use the capabilities of Jersey MVC templating support in your JAX-RS/Jersey application you need to register specific JAX-RS Features provided by the MVC modules. Forjersey-mvc module it is MvcFeature for others it could be, for example, FreemarkerMvcFeature (jersey-mvc-freemarker).

    Example 20.8. Registering MvcFeature

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    new ResourceConfig()
        .register(org.glassfish.jersey.server.mvc.MvcFeature.class)
        // Further configuration of ResourceConfig.
        .register( ... );

    Example 20.9. Registering FreemarkerMvcFeature

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    new ResourceConfig()
        .register(org.glassfish.jersey.server.mvc.freemarker.FreemarkerMvcFeature.class)
        // Further configuration of ResourceConfig.
        .register( ... );

    Note

    Modules that uses capabilities of the base Jersey MVC module register MvcFeature automatically, so you don't need to register this feature explicitly in your code.

    Almost all of the MVC modules are further configurable and either contain a *Properties (e.g. FreemarkerMvcProperties) class describing all the available properties which could be set in a JAX-RS Application / ResourceConfig. Alternatively, the properties are listed directly in the module *Feature class.

    Example 20.10. Setting MvcFeature.TEMPLATE_BASE_PATH value in ResourceConfig

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    new ResourceConfig()
        .property(MvcFeature.TEMPLATE_BASE_PATH, "templates")
        .register(MvcFeature.class)
        // Further configuration of ResourceConfig.
        .register( ... );

    Example 20.11. Setting FreemarkerMvcProperties.TEMPLATE_BASE_PATH value in web.xml

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    <servlet>
        <servlet-name>org.glassfish.jersey.examples.freemarker.MyApplication</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>javax.ws.rs.Application</param-name>
            <param-value>org.glassfish.jersey.examples.freemarker.MyApplication</param-value>
        </init-param>
        <init-param>
            <param-name>jersey.config.server.mvc.templateBasePath.freemarker</param-name>
            <param-value>freemarker</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    20.6. Supported templating engines

    Jersey provides extension modules that enable support for several templating engines. This section lists all the supported engines and their modules as well as discusses any module-specific details.

    20.6.1. Mustache

    An integration module for Mustache-based templating engine.

    Mustache template processor resolves absolute template references to processable template references represented as Mustache templates as follows:

    Procedure 20.1. Resolving Mustache template reference

    1. if the absolute template reference does not end in .mustache append this suffix to the reference; and

    2. if ServletContext.getResource, Class.getResource or File.existsreturns a non-null value for the reference then return the reference as the processable template reference otherwise return null (to indicate the absolute reference has not been resolved by the Mustache template processor).

    Thus the absolute template reference /com/foo/Foo/index would be resolved as /com/foo/Foo/index.mustache, provided there exists a /com/foo/Foo/index.mustacheMustache template in the application.

    Available configuration properties:

    • MustacheMvcFeature.TEMPLATE_BASE_PATH - jersey.config.server.mvc.templateBasePath.mustache

      The base path where Mustache templates are located.

    • MustacheMvcFeature.CACHE_TEMPLATES - jersey.config.server.mvc.caching.mustache

      Enables caching of Mustache templates to avoid multiple compilation.

    • MustacheMvcFeature.TEMPLATE_OBJECT_FACTORY - jersey.config.server.mvc.factory.mustache

      Property used to pass user-configured MustacheFactory.

    • MustacheMvcFeature.ENCODING - jersey.config.server.mvc.encoding.mustache

      Property used to configure a default encoding that will be used if none is specified in @Produces annotation. If property is not defined the UTF-8 encoding will be used as a default value.

    Maven users can find this module at coordinates

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    <dependency>
        <groupId>org.glassfish.jersey.ext</groupId>
        <artifactId>jersey-mvc-mustache</artifactId>
        <version>2.22</version>
    </dependency>

    and for non-Maven users the list of dependencies is available at jersey-mvc-mustache.

    20.6.2. Freemarker

    An integration module for Freemarker-based templating engine.

    Freemarker template processor resolves absolute template references to processable template references represented as Freemarker templates as follows:

    Procedure 20.2. Resolving Freemarker template reference

    1. if the absolute template reference does not end in .ftl append this suffix to the reference; and

    2. if ServletContext.getResource, Class.getResource or File.existsreturns a non-null value for the reference then return the reference as the processable template reference otherwise return null (to indicate the absolute reference has not been resolved by the Freemarker template processor).

    Thus the absolute template reference /com/foo/Foo/index would be resolved to /com/foo/Foo/index.ftl, provided there exists a /com/foo/Foo/index.ftl Freemarker template in the application.

    Jersey will assign the model instance to an attribute named model. So it is possible to reference the foo key from the provided Map (MVC Model) resource from the Freemarker template as follows:

    <h1>${model.foo}</h1>

    Available configuration properties:

    • FreemarkerMvcFeature.TEMPLATE_BASE_PATH - jersey.config.server.mvc.templateBasePath.freemarker

      The base path where Freemarker templates are located.

    • FreemarkerMvcFeature.CACHE_TEMPLATES - jersey.config.server.mvc.caching.freemarker

      Enables caching of Freemarker templates to avoid multiple compilation.

    • FreemarkerMvcFeature.TEMPLATE_OBJECT_FACTORY - jersey.config.server.mvc.factory.freemarker

      Property used to pass user-configured FreemarkerFactory.

    • FreemarkerMvcFeature.ENCODING - jersey.config.server.mvc.encoding.freemarker

      Property used to configure a default encoding that will be used if none is specified in @Produces annotation. If property is not defined the UTF-8 encoding will be used as a default value.

    Maven users can find this module at coordinates

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    <dependency>
        <groupId>org.glassfish.jersey.ext</groupId>
        <artifactId>jersey-mvc-freemarker</artifactId>
        <version>2.22</version>
    </dependency>

    and for non-Maven users the list of dependencies is available at jersey-mvc-freemarker.

    20.6.3. JSP

    An integration module for JSP-based templating engine.

    Limitations of Jersey JSP MVC Templates

    Jersey web applications that want to use JSP templating support should be registered as Servlet filters rather than Servlets in the application's web.xml. Theweb.xml-less deployment style introduced in Servlet 3.0 is not supported at the moment for web applications that require use of Jersey MVC templating support.

    JSP template processor resolves absolute template references to processable template references represented as JSP pages as follows:

    Procedure 20.3. Resolving JSP template reference

    1. if the absolute template reference does not end in .jsp append this suffix to the reference; and

    2. if ServletContext.getResource returns a non-null value for the reference then return the reference as the processable template reference otherwise return null(to indicate the absolute reference has not been resolved by the JSP template processor).

    Thus the absolute template reference /com/foo/Foo/index would be resolved to /com/foo/Foo/index.jsp, provided there exists a /com/foo/Foo/index.jsp JSP page in the web application.

    Jersey will assign the model instance to the attribute named model or it. So it is possible to reference the foo property on the Foo resource from the JSP template as follows:

    <h1>${model.foo}</h1>

    or

    <h1>${it.foo}</h1>

    To include another JSP page in the currently processed one a custom include tag can be used. Mandatory parameter page represents a relative template name which would be absolutized using the same resolving resource class as the parent JSP page template.

    Example 20.12. Including JSP page into JSP page

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    <%@page contentType="text/html"%>
    <%@page pageEncoding="UTF-8"%>
     
    <%@taglib prefix="rbt" uri="urn:org:glassfish:jersey:servlet:mvc" %>
     
    <html>
        <body>
     
        <rbt:include page="include.jsp"/>
     
        </body>
    </html>

    Available configuration properties:

    • JspMvcFeature.TEMPLATE_BASE_PATH - jersey.config.server.mvc.templateBasePath.jsp

      The base path where JSP templates are located.

    Maven users can find this module at coordinates

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    <dependency>
        <groupId>org.glassfish.jersey.ext</groupId>
        <artifactId>jersey-mvc-jsp</artifactId>
        <version>2.22</version>
    </dependency>

    and for non-Maven users the list of dependencies is available at jersey-mvc-jsp.

    20.7. Writing Custom Templating Engines

    To add support for other (custom) templating engines into Jersey MVC Templating facility, you need to implement the TemplateProcessor and register this class into your application.

    Tip

    When writing template processors it is recommend that you use an appropriate unique suffix for the processable template references, in which case it is then possible to easily support mixing of multiple templating engines in a single application without conflicts.

    Example 20.13. Custom TemplateProcessor

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    @Provider
    class MyTemplateProcessor implements TemplateProcessor<String> {
     
        @Override
        public String resolve(String path, final MediaType mediaType) {
            final String extension = ".testp";
     
            if (!path.endsWith(extension)) {
                path = path + extension;
            }
     
            final URL u = this.getClass().getResource(path);
            return u == null ? null : path;
        }
     
        @Override
        public void writeTo(String templateReference,
                            Viewable viewable,
                            MediaType mediaType,
                            OutputStream out) throws IOException {
            final PrintStream ps = new PrintStream(out);
            ps.print("path=");
            ps.print(templateReference);
            ps.println();
            ps.print("model=");
            ps.print(viewable.getModel().toString());
            ps.println();
        }
     
    }

    Example 20.14. Registering custom TemplateProcessor

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    new ResourceConfig()
        .register(MyTemplateProcessor.class)
        // Further configuration of ResourceConfig.
        .register( ... );

    Note

    In a typical set-up projects using the Jersey MVC templating support would depend on the base module that provides the API and SPI and a single templating engine module for the templating engine of your choice. These modules need to be mentioned explicitly in your pom.xml file.

    If you want to use just templating API infrastructure provided by Jersey for the MVC templating support in order to implement your custom support for a templating engine other than the ones provided by Jersey, you will need to add the base jersey-mvc module into the list of your dependencies:

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    <dependency>
        <groupId>org.glassfish.jersey.ext</groupId>
        <artifactId>jersey-mvc</artifactId>
        <version>2.22</version>
    </dependency>

    20.8. Other Examples

    To see an example of MVC (JSP) templating support in Jersey refer to the MVC (Bookstore) Example.
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  • 原文地址：https://www.cnblogs.com/pixy/p/4844636.html
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