找不到媒体类型= application / json的MessageBodyWriter

问题描述

我在使用JSON作为JAX-RS服务时遇到问题。

I am facing issues while consuming JAX-RS services as JSON.

下面我添加了我的代码。

Below I have added my code.

这是我的服务类：

//Sets the path to base URL + /hello
@Path("/hello")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public class Hello {

    @GET
    @Produces("application/json")
    public Student getStudent() {

        Student s = new Student();
        s.first_name = "Test First Name !!!";
        s.last_name = "Test Last Name!!!";

        return s;
    }

学生类哪个我想从服务中获得：

Student class which I am trying to get from service:

@XmlRootElement
public class Student implements Serializable {

    public String first_name;
    public String last_name;

    public String getFirst_name() {
        return first_name;
    }

    public void setFirst_name(String first_name) {
        this.first_name = first_name;
    }

    public String getLast_name() {
        return last_name;
    }

    public void setLast_name(String last_name) {
        this.last_name = last_name;
    }

    public Student()
    {
        first_name = "Fahad";
        last_name = "Mullaji";
    }
}

服务端的Web XML。

Web XML on service side.

<?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"
    id="WebApp_ID" version="3.0">
    <display-name>com.vogella.jersey.first</display-name>
    <servlet>
        <servlet-name>Jersey REST Service</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
        <!-- Register resources and providers under com.vogella.jersey.first package. -->
        <init-param>
            <param-name>jersey.config.server.provider.packages</param-name>
            <param-value>com.vogella.jersey.first</param-value>
        </init-param>
        <init-param>
            <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
            <param-value>true</param-value>
        </init-param>

        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Jersey REST Service</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>
</web-app>

我不知道如何解决这个问题。
我正在使用SOAP UI来测试JSON响应，但我想它应该没关系。

I don't know how to fix this issue.I am using SOAP UI for testing JSON response but I guess that it should not matter.

我读过很多地方我需要添加下面的代码。但我不知道在哪里。我没有使用Maven进行构建。

Many places I read that I need to add the code below. But I don't know where. I am not using Maven for building.

<dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-moxy</artifactId>
</dependency>

服务器正在寻找解析学生的功能对象为JSON，但它无法找到它的函数或jar文件。
我添加了Genson，Moxy，RESTEasy和Jackson的jar，但我认为这是问题所在。
我想我在某个地方缺少映射。

Server is looking for function to parse Student object to JSON but it is not able to find function or jar file for it.I have added jar of Genson, Moxy, RESTEasy and Jackson but I think that's the problem.I think I am missing mapping somewhere.

推荐答案

好吧，我无法使上述Web项目正常工作。但我继续研究JAX-RS，我遇到了Stormpath的教程。我想无论谁想要学习REST，JSON和Jersey如何协同工作都应该注意这一点。

Well, I could not make the above web project working. But I kept on doing research on JAX-RS and I came across Stormpath's tutorial. I think whoever is trying to learn how REST, JSON and Jersey work together should watch this.

请参阅下面的链接，了解他们在GitHub上的演示和示例REST项目。

Please see links below for their presentation and sample REST project on GitHub .

现在我可以比较上面的项目，看看我做错了什么。

Now I can compare above project and see what all things I did wrong.

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