With this example I will show you how to create an archive or zip from multiple files using Java language.

If you already have an idea on how to create a maven project in Eclipse will be great otherwise I will tell you here how to create a maven project in Eclipse. Prerequisites

The following things are required in order to run the application

Eclipse Kepler
JDK 1.8
Have maven 3 installed and configured

Now we will see the below steps how to create a maven based spring project in Eclipse

Step 1. Create a standalone maven project in Eclipse

Go to File -> New -> Other. On popup window under Maven select Maven Project. Then click on Next. Select the workspace location – either default or browse the location. Click on Next. Now in next window select the row as highlighted from the below list of archtypes and click on Next button.

maven-arctype-quickstart

Now enter the required fields (Group Id, Artifact Id) as shown below

Group Id : com.roytuts
Artifact Id : java

Step 2. Modify the pom.xml file as shown below.

<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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.roytuts</groupId>
    <artifactId>java</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>java</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <jdk.version>1.8</jdk.version>
        <junit.version>4.11</junit.version>
    </properties>

    <dependencies>
        <!-- junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>${junit.version}</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>${jdk.version}</source>
                    <target>${jdk.version}</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

Step 3. Create a method to create archieve or zip from multiple files

package com.roytuts.archieve;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class Archieve {

    @SuppressWarnings("resource")
    public static void createZipFromFiles(final String zipFileName, final List<File> files) {
        FileOutputStream fos = null;
        ZipOutputStream zos = null;
        try {
            byte[] buffer = new byte[1024];
            fos = new FileOutputStream(zipFileName);
            zos = new ZipOutputStream(fos);
            if (files != null) {
                for (File file : files) {
                    FileInputStream fs = new FileInputStream(file);
                    zos.putNextEntry(new ZipEntry(file.getName()));
                    int length;
                    while ((length = fs.read(buffer)) > 0) {
                        zos.write(buffer, 0, length);
                    }
                    zos.closeEntry();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (zos != null) {
                    zos.close();
                }
            } catch (Exception e) {
            }
            try {
                if (fos != null) {
                    fos.close();
                }
            } catch (Exception e) {
            }
        }
    }

}

Step 4. Create a junit test case

package com.roytuts.archieve;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import org.junit.Before;
import org.junit.Test;

public class ArchieveTest {

    private List<File> files;

    @Before
    public void setUp() throws Exception {
        files = new ArrayList<File>();
        File f1 = new File("D:/test.sql");
        File f2 = new File("D:/website.sql");
        File f3 = new File("D:/school.sql");
        files.add(f1);
        files.add(f2);
        files.add(f3);
    }

    @Test
    public void testCreateZipFromFiles() {
        Archieve.createZipFromFiles("D:/Archieve.zip", files);
    }

}

Step 5. Now run the junit test class, you will get the zip output in “D” drive.

Thanks for reading.

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