Question

此抓取程序超出范围异常怎么解决？

线程中的异常＆＃34; main＆＃34; java.lang.IndexOutOfBoundsException：索引： 11，大小：11 at java.util.ArrayList.rangeCheck（ArrayList.java:653）在java.util.ArrayList.get（ArrayList.java:429）at Glowship_inv_battery.main（Glowship_inv_battery.java:68）

代码：

import java.util.ArrayList;

import com.webscrap4j.WebScrap;
import com.webscrap4j.WebScrapException;

import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Row;

public class letsbuybattery_inverterbattery 
{
    @SuppressWarnings("resource")
    public static void main(String[] args) throws IOException {

        ArrayList<String> al = new ArrayList<String>();
        ArrayList<String> bl = new ArrayList<String>();
        ArrayList<String> cl = new ArrayList<String>();
        WebScrap ws = new WebScrap();

        ws.setUrl("http://letsbuybattery.com/inverters/");
        try
        {               
            ws.startWebScrap();

            al = ws.getSingleHTMLScriptData("<h5>", "</h5>");
            //mrp
            bl = ws.getSingleHTMLScriptData("<div class='clearfix'> ", "</div>");
            //selling price
            cl = ws.getSingleHTMLScriptData("<div class='item-price pull-left'>", "</div>");                

            HSSFWorkbook workBook = new HSSFWorkbook();
             FileOutputStream fos = new FileOutputStream("/Users/parthpatil/Documents/Abm Technologies/Crawl/letbuybattery_battery.xls"); 
             {

            // Create the Sheet
            HSSFSheet Sheet = workBook.createSheet("products");

            // Create the first row corresponding to the header
            Row header = Sheet.createRow(0);
            header.createCell(0).setCellValue("Product Name");
            header.createCell(1).setCellValue("Product Price");
            header.createCell(2).setCellValue("Product MRP");

            // Ensure that all the List have the same size otherwise throw an exception
            //  if (al.size() != bl.size() || al.size() != cl.size())
            //    throw new IllegalStateException("Some data is missing");

            // Iterate over all the list an create the rows of data
            for(int i = 0; i < al.size(); i++){
                // Create the current starting from 1 to al.size()
                HSSFRow row = Sheet.createRow((short) i + 1);
                // Cell of the Product Name
                row.createCell(0).setCellValue(al.get(i));
                // Cell of the Product Price
                row.createCell(1).setCellValue(cl.get(i));
                // Cell of the Product MRP
                row.createCell(2).setCellValue(bl.get(i));

            }
            // Write the result into the file
            workBook.write(fos);

            for (String adata : al)
            {    
                System.out.println("the product are:- " + adata);    
            }

            for (String bdata : bl)
            {
                System.out.println("the MRp are:- " + bdata);    
            }

            for (String cdata : cl)
            {    
                System.out.println("the selling price is:- " + cdata);    
            }               
        }
             }catch (WebScrapException e) {

            e.printStackTrace(System.out);
        }
        }
    }

Answer 1

以下是代码的爆炸式增长：

 for(int i = 0; i < al.size(); i++){
                // Create the current starting from 1 to al.size()
                HSSFRow row = Sheet.createRow((short) i + 1);
                // Cell of the Product Name
                row.createCell(0).setCellValue(al.get(i));
                // Cell of the Product Price
                row.createCell(1).setCellValue(cl.get(i));
                // Cell of the Product MRP
                row.createCell(2).setCellValue(bl.get(i));
            }

您使用 al 的大小进行循环，但不检查 bl 或 cl 的大小......

Answer 2

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 11, Size: 11 
at java.util.ArrayList.rangeCheck(ArrayList.java:653) 
at java.util.ArrayList.get(ArrayList.java:429) 
at Glowship_inv_battery.main(Glowship_inv_battery.java:68)

让我们把它翻译成简单的英语：

There was an Exception thrown because of accessing notexisting index which is 11 
    on an object which has size 11, so has indexes from 0 to 10.
It has occured on line 653 of ArrayList.java, in method rangeCheck,
    which was invoked from:
line 429 of ArrayList.java, in method get
    which was invoked from
line 68 of Glowship_inv_battery.java in method main

可能的解决方案。在Glowship_inv_battery.java文件的第68行放置一个断点并进行调试。您的调试器肯定有可能在运行时查找所有值。

Answer 3

a1，b1，c1你必须确保b1，c1和至少相同大小或大于a1.size（）。调整你的逻辑acc.means迭代语句应该在三个中的最小值之间arraylists.use使用类似下面的内容来查找给出arraylists之间的最小大小并使用该值来启动你的循环。你得到的错误是在下面的代码中生成你将indexout的绑定，因为显然b1和c1小于a1和你的i index将尝试获取b1.get（2），c2.get（2），它显然没有任何值

public static void main(String[] args) {
    // TODO Auto-generated method stub


    ArrayList<String> a1=new ArrayList<>();
    ArrayList<String> b1=new ArrayList<>();
    ArrayList<String> c1=new ArrayList<>();
    a1.add("a1");
    a1.add("a2");
    a1.add("a3");

    b1.add("b1");
    b1.add("b2");

    c1.add("c1");
    c1.add("c2");

    for(int j=0;j<a1.size();j++)
    {
        System.out.println("finding thestuuf from arralist to use in your excel cells"+">>>"+a1.get(j)+">>>"+b1.get(j)+">>>"+c1.get(j));
    }

}

public class TestArrayList {

<T> void save(T o) {
    @DatabaseTable
    class wrap extends T {
        @DatabaseField(generatedId = true)
        public Long id;
    }

    try {
        Dao<T, Long> d = (Dao<T, Long>) getClassDao(o.getClass());
        TableUtils.createTableIfNotExists(connectionSource, o.getClass());
        d.createOrUpdate(o);
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

}

线程＆＃34; main＆＃34;中的例外情况java.lang.IndexOutOfBoundsException：索引：11，大小：11

3 个答案: