Question

主：

public static void main(String args[]){

 PicParcer c = new PicParcer();
 strHtml = c.getHTML(strMainLink);
 links = c.poimeyArray(strHtml);
 space = c.spaceDel(links);

 /*
 for (String strHtml1 : strHtml) {
        System.out.println(strHtml);
    }*/

    for (String strHtml1 : links) {
        System.out.println(strHtml1);
    }

    for (String link : space) {
        System.out.println(link);
    }


 System.out.println(strHtml.size());
 System.out.println(links.size());
 }

getHTML方法;

public ArrayList<String> getHTML(String urlToRead) {                                    //получаем сайт
        ArrayList<String> html = new ArrayList<String>();
        URL url;
        HttpsURLConnection conn;
        BufferedReader reader;
        String line;                                                            /// очень нужная фигня!!!!!
        try {
            url = new URL(urlToRead);
            conn = (HttpsURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));

            while((line=reader.readLine()) != null) {
                html.add(line);
            }

         reader.close();
      } catch (Exception e) {
         e.printStackTrace();
      }
      return html;
   }

public static final String strJPG =“.jpg”;

public ArrayList<String> spaceDel(ArrayList<String> htmlArray){
    ArrayList<String> spaceDel = new ArrayList<String>();
    for(int i=0; i< htmlArray.size();i++){
        spaceDel.add(htmlArray.get(i).substring(htmlArray.get(i).indexOf("/"), htmlArray.get(i).indexOf(strJPG)));
    }

    return spaceDel;
}

在此示例中，我有StringIndexOutOfBoundsException异常，如果我将strJPG（字符串）更改为“。”或者使用try-catch程序是有效的。我做错了什么？

字符串示例：

<img src="/b/thumb/88785978/14267775060770s.jpg" width="220" height="123" alt="87" class="img preview ">
<img src="/b/thumb/88785978/14267776383080s.jpg" width="220" height="123" alt="94" class="img preview ">
<img src="/b/thumb/88785978/14267776539240s.jpg" width="208" height="220" alt="32" class="img preview ">
<img src="/b/thumb/88785978/14267788646090s.jpg" width="204" height="220" alt="130" class="img preview ">
<img src="/b/thumb/88785978/14267792210110s.jpg" width="220" height="146" alt="44" class="img preview ">
<img src="/b/thumb/88785978/14267793068690s.jpg" width="220" height="123" alt="711" class="img preview ">
<img src="/b/thumb/88785978/14267794678710s.jpg" width="220" height="220" alt="54" class="img preview ">
<img src="/b/thumb/88785978/14267795607190s.jpg" width="220" height="214" alt="95" class="img preview ">
<img src="/b/thumb/88785978/14267800381730s.jpg" width="220" height="192" alt="126" class="img preview ">
<img src="/b/thumb/88785978/14267806796140s.jpg" width="220" height="124" alt="4612" class="img preview ">
<img src="/b/thumb/88785978/14267832300390s.jpg" width="150" height="109" alt="2" class="img preview ">

Answer 1

我在一个简短的例子中试过你的代码

package de.pageto.mavenproject1;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class StringSplitter {

    public static void main(String[] args) {
        String[] data = {"<img src=\"/b/thumb/88785978/14267775060770s.jpg\" width=\"220\" height=\"123\" alt=\"87\" class=\"img preview \">",
            "<img src=\"/b/thumb/88785978/14267776383080s.jpg\" width=\"220\" height=\"123\" alt=\"94\" class=\"img preview \">",
            "<img src=\"/b/thumb/88785978/14267776539240s.jpg\" width=\"208\" height=\"220\" alt=\"32\" class=\"img preview \">",
            "<img src=\"/b/thumb/88785978/14267788646090s.jpg\" width=\"204\" height=\"220\" alt=\"130\" class=\"img preview \">",
            "<img src=\"/b/thumb/88785978/14267792210110s.jpg\" width=\"220\" height=\"146\" alt=\"44\" class=\"img preview \">",
            "<img src=\"/b/thumb/88785978/14267793068690s.jpg\" width=\"220\" height=\"123\" alt=\"711\" class=\"img preview \">",
            "<img src=\"/b/thumb/88785978/14267794678710s.jpg\" width=\"220\" height=\"220\" alt=\"54\" class=\"img preview \">",
            "<img src=\"/b/thumb/88785978/14267795607190s.jpg\" width=\"220\" height=\"214\" alt=\"95\" class=\"img preview \">",
            "<img src=\"/b/thumb/88785978/14267800381730s.jpg\" width=\"220\" height=\"192\" alt=\"126\" class=\"img preview \">",
            "<img src=\"/b/thumb/88785978/14267806796140s.jpg\" width=\"220\" height=\"124\" alt=\"4612\" class=\"img preview \">",
            "<img src=\"/b/thumb/88785978/14267832300390s.jpg\" width=\"150\" height=\"109\" alt=\"2\" class=\"img preview \">"
        };
        System.out.println("Result: " + spaceDel(Arrays.asList(data)));
    }

    public static ArrayList<String> spaceDel(List<String> htmlArray) {
        final String strJPG = ".jpg";
        ArrayList<String> spaceDel = new ArrayList<>();
        for (String str : htmlArray) {
            spaceDel.add(str.substring(str.indexOf("/"), str.indexOf(strJPG)));
        }
        return spaceDel;
    }
}

一切正常。在我看来，您尝试将<img>标记与HTML页面分开。这些标签可以具有其他图像格式.jpg（即png，gif或jpeg）。

您必须先检查数据。

为什么StringIndexOutOfBoundsException？

1 个答案: