JAX RS download image file example

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This is index.html JSP file and it is used display the output for the application.




<html>

<body>

<h1>JAX-RS @Download image Testing</h1>


<a href="./image/get">click here</a><br>

</body>

</html>












This is ImageService.java file having the service/business logic to call the DAO layer and get the information from database.





  
  








 

    
package com.cv.webservices.rest;



import java.io.File;



import javax.ws.rs.GET;

import javax.ws.rs.Path;

import javax.ws.rs.Produces;

import javax.ws.rs.core.Response;

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

/**

 * @author Chandra Vardhan

 *

 */

@Path("/image")

public class ImageService {



  private static final String FILE_NAME = "image.jpg";



  @GET

  @Path("/get")

  @Produces("image/png")

  public Response getFile() {

    String filePath = getFile(FILE_NAME);

    File file = new File(filePath);

    ResponseBuilder response = Response.ok((Object) file);

    response.header("Content-Disposition",

        "attachment; filename=image_from_server.jpg");

    return response.build();



  }



  private String getFile(String fileName) {

    // Get file from resources folder

    return getClass().getClassLoader().getResource(fileName).getPath();

  }

}

    












This is pom.xml file having the entries of dependency jars and information to build the application .


	
<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/xsd/maven-4.0.0.xsd">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.cv.webservices.common</groupId>
	<artifactId>JAXRSDownloadImageFileExample</artifactId>
	<packaging>war</packaging>
	<version>1.0</version>
	<name>JAXRSDownloadImageFileExample Maven Webapp</name>
	<url>http://maven.apache.org</url>

	<repositories>
		<repository>
			<id>JBoss repository</id>
			<url>https://repository.jboss.org/nexus/content/groups/public-jboss/</url>
		</repository>
	</repositories>

	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.8.2</version>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>org.jboss.resteasy</groupId>
			<artifactId>resteasy-jaxrs</artifactId>
			<version>2.2.1.GA</version>
		</dependency>

	</dependencies>

	<build>
		<finalName>JAXRSDownloadImageFileExample</finalName>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
				</configuration>
			</plugin>
		</plugins>
	</build>

</project>





This is web.xml deployment descriptor file and it describes how the web application should be deployed.


	

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
		 http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
	version="3.1">
	<display-name>Restful Web Application</display-name>

	<context-param>
		<param-name>resteasy.scan</param-name>
		<param-value>true</param-value>
	</context-param>

	<listener>
		<listener-class>
			org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
		</listener-class>
	</listener>
	<servlet>
		<servlet-name>resteasy-servlet</servlet-name>
		<servlet-class>
			org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
		</servlet-class>
	</servlet>


	<servlet-mapping>
		<servlet-name>resteasy-servlet</servlet-name>
		<url-pattern>/image/*</url-pattern>
	</servlet-mapping>

	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
	</welcome-file-list>
</web-app>





This is log4j.properties file having the entries for logging the information into the console/file. 



#By default enabling Console appender
# Root logger option
log4j.rootLogger=INFO, stdout

# Redirect log messages to console
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%-5p [%c]:%L -->> %m%n

# Redirect log messages to a log file
#log4j.appender.file=org.apache.log4j.RollingFileAppender
#log4j.appender.file.File=C:\servlet-application.log
#log4j.appender.file.MaxFileSize=5MB
#log4j.appender.file.MaxBackupIndex=10
#log4j.appender.file.layout=org.apache.log4j.PatternLayout
#log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n










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