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我無法弄清楚如何引用txt文件中的特定行文本。我需要一個具體的URL列表中的特定圖像,我試圖通過連接URL前綴和來自txt文件中的數字列表的搜索數字來生成URL。我無法弄清楚如何引用txt文件並從行號中獲取字符串。具有多個URL的Java特定圖像下載器
package getimages;
public class ExtractAllImages {
public static int url_to_get = 1;
public static String urlupc;
public static String urlpre = "http://urlineedimagefrom/searchfolder/";
public static String url2 = "" + urlpre + urlupc + "";
public static void main(String args[]) throws Exception {
while(url_to_get > 2622){
String line = Files.readAllLines(Paths.get("file_on_my_desktop.txt")).get(url_to_get);
urlupc = line;
url2 = "" + urlpre + urlupc + "";
String webUrl = url2;
URL url = new URL(webUrl);
URLConnection connection = url.openConnection();
InputStream is = connection.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
HTMLEditorKit htmlKit = new HTMLEditorKit();
HTMLDocument htmlDoc = (HTMLDocument) htmlKit.createDefaultDocument();
HTMLEditorKit.Parser parser = new ParserDelegator();
HTMLEditorKit.ParserCallback callback = htmlDoc.getReader(0);
parser.parse(br, callback, true);
for (HTMLDocument.Iterator iterator = htmlDoc.getIterator(HTML.Tag.IMG); iterator.isValid(); iterator.next()) {
AttributeSet attributes = iterator.getAttributes();
String imgSrc = (String) attributes.getAttribute(HTML.Attribute.SRC);
if (imgSrc != null && (imgSrc.endsWith(".jpg") || (imgSrc.endsWith(".png")) || (imgSrc.endsWith(".jpeg")) || (imgSrc.endsWith(".bmp")) || (imgSrc.endsWith(".ico")))) {
try {
downloadImage(webUrl, imgSrc);
} catch (IOException ex) {
System.out.println(ex.getMessage());
}
}
}
}
}
public static String right(String value, int length) {
return value.substring(value.length() - length);}
private static void downloadImage(String url, String imgSrc) throws IOException {
BufferedImage image = null;
try {
if (!(imgSrc.startsWith("http"))) {
url = url + imgSrc;
} else {
url = imgSrc;
}
String webUrl = url2;
String imagename = right(webUrl , 12);
imgSrc = imgSrc.substring(imgSrc.lastIndexOf("/") + 1);
String imageFormat = null;
imageFormat = imgSrc.substring(imgSrc.lastIndexOf(".") + 1);
String imgPath = null;
imgPath = "C:/Users/Noah/Desktop/photos/" + urlupc + ".jpg";
URL imageUrl = new URL(url);
image = ImageIO.read(imageUrl);
if (image != null) {
File file = new File(imgPath);
ImageIO.write(image, imageFormat, file);
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
我的錯誤是在設置串線,我的txt文件有2622行,我不能引用我的桌面上的文件和IM不知道如何設置文件路徑到我的桌面?對不起,我不擅長java。
感謝您的任何幫助。