fully working Sprite-Resource downloader

SpriteResourceDownloader.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4" />

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<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>de.yochyo.sprite-resource-downloader</groupId>
+    <artifactId>SpriteResourceDownloader</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <kotlin.version>1.3.40</kotlin.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.jsoup</groupId>
+            <artifactId>jsoup</artifactId>
+            <version>1.12.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-stdlib</artifactId>
+            <version>${kotlin.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-test</artifactId>
+            <version>${kotlin.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.jetbrains.kotlin</groupId>
+                <artifactId>kotlin-maven-plugin</artifactId>
+                <version>${kotlin.version}</version>
+                <executions>
+                    <execution>
+                        <id>compile</id>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>test-compile</id>
+                        <phase>test-compile</phase>
+                        <goals>
+                            <goal>test-compile</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+
+</project>

src/main/java/de/yochyo/spriteresourcedownloader/Main.kt

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+package de.yochyo.spriteresourcedownloader
+
+import org.jsoup.Jsoup
+import org.jsoup.nodes.Document
+import java.io.File
+import java.lang.Exception
+import java.net.URL
+
+lateinit var host: String
+fun main(args: Array<String>) {
+    if (args.isNotEmpty()) {
+        val builder = StringBuilder()
+        for (a in args)
+            builder.append(a)
+        val url = builder.toString().filter { it != '"' && it != '\'' }
+        host = "https://${URL(url).host}"
+        val doc = Jsoup.connect(url).get()
+        val sheetsNumber = getSheetsNumber(doc)
+        val links = getLinksToSprite(doc)
+        if(sheetsNumber != links.size) println("error in program, not all sprites are downloaded")
+        var downloaded = 1
+        val threadAmount = 5
+        for(i in 0 until threadAmount){
+            Thread{
+                for(index in i until sheetsNumber step threadAmount){
+                    try {
+                        val doc = Jsoup.connect(host + links[index]).get()
+                        val bytes = downloadImageByUrl(doc)
+                        val name = getImageNameByUrl(doc)
+                        if(bytes != null && name != null){
+                            saveFile("${index+1} - $name", bytes)
+                            println("Downloaded $downloaded/$sheetsNumber")
+                        }else println("Error downloading $index")
+                    }catch (e: Exception){
+                        e.printStackTrace()
+                    }
+                    downloaded++
+                }
+            }.start()
+        }
+
+    }
+}
+
+fun getSheetsNumber(doc: Document): Int {
+    var sheetsNumber = -1
+    for (sheetRow in doc.getElementsByClass("altrow0")) {
+        for (e in sheetRow.allElements)
+            if (e.text() == "Sheets") {
+                sheetsNumber = sheetRow.allElements.last().text().toInt()
+            }
+    }
+    return sheetsNumber
+}
+
+fun getLinksToSprite(doc: Document): ArrayList<String> {
+    val links = ArrayList<String>(getSheetsNumber(doc))
+    val spriteContainers = doc.getElementsByClass("updatesheeticons")
+    for (item in spriteContainers) {
+        for (i in item.getElementsByAttribute("style"))
+            links += i.attr("href")
+    }
+    return links
+}
+
+fun getImageUrl(doc: Document): String? {
+    try {
+        for (e in doc.allElements) {
+            if (e.text() == "Download this Sheet"){
+                val s = host + e.allElements.last().attr("href") //todo ist das hier jetzt der richtige link?
+                return s
+            }
+        }
+    }catch (e: Exception){}
+    return null
+}
+
+fun downloadImageByUrl(doc: Document): ByteArray? {
+    try {
+        val url = getImageUrl(doc)
+        if (url != null) {
+            try {
+                val con = URL(url).openConnection()
+                val stream = con.getInputStream()
+                val bytes = stream.readBytes()
+                stream.close()
+                return bytes
+            }catch (e: Exception){}
+        }
+    }catch (e: Exception){}
+    return null
+}
+
+fun getImageNameByUrl(doc: Document): String? {
+    try {
+        var name = ""
+        for (meta in doc.getElementsByTag("meta")) {
+            if (meta.attr("name") == "description")
+                name = meta.attr("content")
+        }
+        if (name == "") return null
+
+        val index = name.indexOf(" - The #1 source for video game sprites on the internet!")
+        return if (index != -1) name.substring(0, index)
+        else name
+    }catch (e: Exception){
+        return null
+    }
+}
+
+fun saveFile(name: String, bytes: ByteArray){
+    val file = File(nameToFilename(name))
+    file.createNewFile()
+    file.writeBytes(bytes)
+}
+
+fun removeParameters(url: String): String{
+    var url = url
+    val questionMarkIndex = url.lastIndexOf("?")
+    if(questionMarkIndex != -1)
+        url = url.substring(0, questionMarkIndex)
+    return url
+}
+fun getAbsoluteUrl(parent: String, child: String): String = parent + child
+
+private fun nameToFilename(name: String): String {
+    val s = name.filter { it != '/' && it != '\\' && it != '|' && it != ':' && it != '*' && it != '?' && it != '"' && it != '[' && it != ']' }
+    var last = s.length
+    if (last > 123) last = 123
+    return s.substring(0, last) + ".png"
+}

src/main/resources/META-INF/MANIFEST.MF

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+Manifest-Version: 1.0
+Main-Class: de.yochyo.spriteresourcedownloader.MainKt
+

target/classes/META-INF/MANIFEST.MF

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+Manifest-Version: 1.0
+Main-Class: de.yochyo.spriteresourcedownloader.MainKt
+