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我目前正在使用 JSoup 从 HTML 表中抓取数据，然后将其存储到 ArrayList 中。然后我想将这些值存储在 SQL 数据库中。据我了解，这些必须先转换为字符串，然后才能插入数据库。我将如何将这些 ArrayLists 转换为字符串？

这是我当前的代码：

    Document doc = Jsoup.connect(URL).timeout(5000).get();

    for (Element table : doc.select("table:first-of-type")) 
    {
        for (Element row : table.select("tr:gt(0)")) { 
            Elements tds = row.select("td");

            List1.add(tds.get(0).text());
            List2.add(tds.get(1).text());
            List3.add(tds.get(2).text());
        }
    }
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3 回答 3

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To get all the values you need, you can iterate through the list very easily :

public static void main(String[] args) {
    List<String> List1 = new ArrayList<>();
    for (String singleString : List1){
        //Do whatever you want with each string stored in this list
    }
}
于 2013-10-24T15:49:54.490 回答
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Well i am not really sure if there is some special way to achieve what you are asking . You would need to iterate over the array . You could use the StringBuilder instead of String for a bit of optimization. I am not really sure how much of a boost you would gain in performance ..

Anyway this is how the code would look ..

StringBuilder sb = new StringBuilder();
for (Object o : list1){
  sb.append(o.toString()+delimiter); // delimiter could be , or \t or || 

 //You could manipulate the string here as required..
 //  enter code here`
}
return sb.toString();

You would then need to split the strings if required. ( if they need to go into seperate fields

于 2013-10-24T16:08:57.097 回答
0

Java 集合框架没有提供任何直接的实用方法来将 ArrayList 转换为 Java 中的 String。但是以依赖注入而闻名的 Spring 框架及其 IOC 容器也提供了 API 和通用实用程序，例如在 Java 中将 Collection 转换为 String 的方法。您可以使用 Spring Framework 的 StringUtils 类将 ArrayList 转换为 String。StringUtils 类提供了三种方法来转换任何集合

例如Java中的ArrayList转String，如下图：

public static String collectionToCommaDelimitedString(Collection coll)
public static String collectionToDelimitedString(Collection coll, String delim)
public static String collectionToDelimitedString(Collection coll, String delim, String  prefix, String suffix)

知道了....

于 2013-10-24T15:55:53.617 回答