jersey 2.x 可选实体过滤

Question

我是泽西岛的新手，我尝试使用 SelectableEntityFilteringFeature

我使用以下类/文件创建了一个小型服务：

一个名为 EmployeeResource.java 的资源文件

@
Path("employee")@ Produces("application/json")
public class EmployeeResource {

    @
    GET
    public Employee getEmployee() {
        System.out.println("-->Entered into getEmployee()");
        Employee employee = new Employee();
        employee.setId(123);
        employee.setName("raj");
        System.out.println(employee);
        System.out.println("<--Exited from getEmployee()");
        return employee;
    }

}

一个名为 Employee.java 的域

 @
 XmlRootElement
 public class Employee {

     private String name;

     private Integer id;

     public String getName() {
         return name;
     }

     public void setName(String name) {
         this.name = name;
     }

     public Integer getId() {
         return id;
     }

     public void setId(Integer id) {
         this.id = id;
     }

     @
     Override
     public String toString() {
         return "Employee [name=" + name + ", id=" + id + "]";
     }

 }

一个 web.xml 文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee" 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>Archetype Created Web Application</display-name>
    <servlet>
        <servlet-name>jersey-serlvet</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>jersey.config.server.provider.packages</param-name>
            <param-value>com.filter.jersey</param-value>
        </init-param>
        <init-param>
            <param-name>jersey.config.server.provider.classnames</param-name>
            <param-value>
                        org.glassfish.jersey.filter.LoggingFilter,
                        org.glassfish.jersey.message.filtering.SelectableEntityFilteringFeature,
                        org.glassfish.jersey.jackson.JacksonFeature
                    </param-value>
        </init-param>
        <init-param>
            <param-name>jersey.config.entityFiltering.selectable.query</param-name>
            <param-value>select</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>jersey-serlvet</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>
</web-app>

一个 pom.xml 文件

<project
    xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.howtodoinjava</groupId>
    <artifactId>SelectableFiltering</artifactId>
    <version>1.0</version>
    <packaging>war</packaging>
    <repositories>
        <repository>
            <id>maven2-repository.java.net</id>
            <name>Java.net Repository for Maven</name>
            <url>http://download.java.net/maven/2/</url>
            <layout>default</layout>
        </repository>
    </repositories>
    <properties>
        <jersey2.version>2.19</jersey2.version>
        <jaxrs.version>2.0.1</jaxrs.version>
    </properties>
    <dependencies>
        <!-- JAX-RS -->
        <dependency>
            <groupId>javax.ws.rs</groupId>
            <artifactId>javax.ws.rs-api</artifactId>
            <version>${jaxrs.version}</version>
        </dependency>
        <!-- Jersey 2.19 -->
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-servlet</artifactId>
            <version>${jersey2.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.core</groupId>
            <artifactId>jersey-server</artifactId>
            <version>${jersey2.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.core</groupId>
            <artifactId>jersey-client</artifactId>
            <version>${jersey2.version}</version>
        </dependency>
    </dependencies>
    <build>
        <finalName>JerseyDemos</finalName>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

测试用例如下

http://localhost:8080/SelectableFiltering/employee?select=id,name

预期响应 { “身份证”：“123” “名称”：“拉吉” }

http://localhost:8080/SelectableFiltering/employee?select=id

预期响应 { “身份证”：“123” }

它应该只返回 id 但它会返回所有内容。我无法通过搜索互联网找到解决方案，但也许这里的任何人都可以告诉我我做错了什么。

当我访问上述资源时也得到 500 作为响应，即

http://localhost:8080/SelectableFiltering/employee?select=id http://localhost:8080/SelectableFiltering/employee?select=id,name

下面的堆栈跟踪 2016 年 7 月 27 日晚上 8:48:21 org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor aroundWriteTo 严重：找不到媒体类型 = 应用程序/json、类型 = com.filter.jersey.Employee 类、genericType = com.filter.jersey.Employee 类的 MessageBodyWriter。 2016 年 7 月 27 日 8:48:21 PM org.glassfish.jersey.filter.LoggingFilter 日志 INFO: 1 * 服务器响应线程 http-nio-8080-exec-12 上的响应 1

这里可以告诉我我做错了什么。

Answer 1

如果您想同时发送 JSON 和 HTTP 状态，您可以使用 Response 作为您的返回类型。

    @GET
    public Response getEmployee() {
        System.out.println("-->Entered into getEmployee()");
        Employee employee = new Employee();
        employee.setId(123);
        employee.setName("Raju");
        System.out.println(employee);
        System.out.println("<--Exited from getEmployee()");

        return Response.ok(employee.toString(), MediaType.APPLICATION_JSON).build();

    }

别忘了添加

import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;