Jersey 配合 Jackson 输出 json

小咪咪 2022-07-18 05:14 139阅读 0赞

**1. 依赖**

<dependency>
        <groupId>com.sun.jersey</groupId>
        <artifactId>jersey-server</artifactId>
        <version>1.8</version>
    </dependency>
    
    <dependency>
        <groupId>com.sun.jersey</groupId>
        <artifactId>jersey-json</artifactId>
        <version>1.8</version>
    </dependency>

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

**2.修改 web.xml**

<init-param>
        <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
        <param-value>true</param-value>
    </init-param>

完整的例子

<web-app ...>
    
      <servlet>
        <servlet-name>jersey-serlvet</servlet-name>
        <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>com.sun.jersey.config.property.packages</param-name>
            <param-value>com.mkyong.rest</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-serlvet</servlet-name>
        <url-pattern>/rest/*</url-pattern>
      </servlet-mapping>
    
    </web-app>

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

**3.需要转换的java object**

public class Track { 
        String title;
        String singer;
    
        public String getTitle() {
            return title;
        }
    
        public void setTitle(String title) {
            this.title = title;
        }
    
        public String getSinger() {
            return singer;
        }
    
        public void setSinger(String singer) {
            this.singer = singer;
        }
    
        @Override
        public String toString() {
            return "Track [title=" + title + ", singer=" + singer + "]";
        }
    }

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

**4.使用注解 @Produces(MediaType.APPLICATION\_JSON)**

import javax.ws.rs.Consumes;
    import javax.ws.rs.GET;
    import javax.ws.rs.POST;
    import javax.ws.rs.Path;
    import javax.ws.rs.Produces;
    import javax.ws.rs.core.MediaType;
    import javax.ws.rs.core.Response;
    
    import com.mkyong.Track;
    
    @Path("/json/metallica")
    public class JSONService { 
    
        @GET
        @Path("/get")
        @Produces(MediaType.APPLICATION_JSON)
        public Track getTrackInJSON() {
    
            Track track = new Track();
            track.setTitle("Enter Sandman");
            track.setSinger("Metallica");
    
            return track;
    
        }
    
        @POST
        @Path("/post")
        @Consumes(MediaType.APPLICATION_JSON)
        public Response createTrackInJSON(Track track) {
    
            String result = "Track saved : " + track;
            return Response.status(201).entity(result).build();
        }
    
    }

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

1.  测试

访问/json/metallica/get 这个URL的时候，应该得到如下的结果

![这里写图片描述][20160906153742157]

{
        "singer":"Metallica",
        "title":"Enter Sandman"
    }

**[这里有完整的代码包例子][Link 1]**

[20160906153742157]: /images/20220717/81d9ef06552e42399f30d612a33faf56.png
[Link 1]: http://www.mkyong.com/wp-content/uploads/2011/07/JSON-Support-Jersey-Example.zip