Struts 2 “#” symbol: get the data in the collection and select it

• Java

Syntax:

list. {?#conditional expression>value}

For example, if a collection contains multiple student objects, obtaining all students older than 10 in this collection is a selection operation.

Example

public class OgnlAction extends ActionSupport{  //定义List类型books变量
  private List<Book>books;
  public List<Book>getBooks(){
    return books;
  }
  public String execute(){  //初始化books对象
    books = new LinkedList<Book>();  //应用add()方法为List类型books变量赋值
    books.add(new Book("978-0735619678","编程宝典",50.99));
    books.add(new Book("978-0596007867","典型模块大全",35.96));
    books.add(new Book("978-0201633610","开发实战宝典",50.19));
    books.add(new Book("978-0596527341","范例大全",25.19));
    books.add(new Book("978-0735605350","技术开发大全",50.19));
    return SUCCESS;
  }
}
<body>
  <h3>用于过滤集合</h3>
  <p>书的价格超过50美元的是</p>
  <ul>
    <s:iterator value="books.{?#this.price>50}">
      <li><s:property value="title"/>-$<s:property value="price"/></li>
    </s:iterator>
  </ul>
  <p>"范例大全"的价格是:<s:property value="books.{?#this.title=='范例大全'}.{price}
    [0]"/></p>
</body>}
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