JAX-RS files

• FilesService.java
• Id.java
• pom.xml

FilesService.java

package com.training.rs;

import java.io.File;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import javax.ws.rs.ApplicationPath;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Application;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.ResponseBuilder;

import com.google.common.base.Function;
import com.google.common.collect.Collections2;

@ApplicationPath("/")
@Path("/")
public class FilesService extends Application {

    private static int lastId = 0;
    private Map<String, File> files = new HashMap<String, File>();

    @GET
    @Path("/ids")
    @Produces(MediaType.APPLICATION_XML)
    public Collection<Id> getFileIds() {
        return transformToIdObject();
    }

    @GET
    @Path("/file/{id}")
    public File getFile(@PathParam("id") String id) {
        return files.get(id);
    }

    @GET
    @Path("/file/response/{id}")
    public Response getResponseWithFile(@PathParam("id") String id) {
        File file = files.get(id);
        ResponseBuilder responseBuilder = Response.ok((Object) file);
        responseBuilder.header("Content-Disposition", "attachment; filename="
                + file.getName());

        return responseBuilder.build();
    }

    @PUT
    @Path("/file")
    public String putFile(File file) {
        String generatedId = String.valueOf(lastId++);
        files.put(generatedId, file);
        return generatedId;
    }

    @DELETE
    @Path("/file/{id}")
    public void deleteFile(@PathParam("id") String id) {
        files.remove(id);
    }

    private Collection<Id> transformToIdObject() {
        return Collections2.transform(files.keySet(),
                new Function<String, Id>() {

                    public Id apply(String id) {
                        return new Id(id);
                    }
                });
    }
}

Id.java

package com.training.rs;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class Id {

    private String id;

    public Id() {
    }

    public Id(String id) {
        this.id = id;
    }

    public String getId() {
        return id;
    }

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

}

pom.xml

<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.training</groupId>
    <artifactId>jax_rs_files</artifactId>
    <packaging>war</packaging>
    <version>1.0</version>

    <dependencies>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-web-api</artifactId>
            <version>6.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>18.0</version>
        </dependency>
    </dependencies>

</project>