Struts2表达式封装Action获取不到表单数据的一次记录

Posted 2021-03-06 程小猿学编程

在学习Struts框架时，想复习一下所学知识，发现通过表达式封装表单数据到action，在action中无法获得数据，记录一下。

以下是各部分配置：

请求路径：

1 <package name="struts2" namespace="/" extends="json-default">
2         <action name="action1" class="top.ionestu.action.ModeDrivenDemoAction"></action>
3  </package>

页面配置：

1 <form action="${pageContext.request.contextPath}/action1.action" method="post">
2         bookName:<input type="text" name="book.bookName"><br>
3         price:<input type="text" name="book.price"><br>
4         bookSN:<input type="text" name="book.bookSN"><br>
5         <input type="submit" value="提交">
6 </form>

Action类：

public class ModeDrivenDemoAction extends ActionSupport {

    private Book book;

    public Book getBook() {
        return book;
    }

    public void setBook(Book book) {
        this.book = book;
    }

    public String action1() throws Exception {
        System.out.println(book);
        return NONE;
    }
}

在页面提交请求后，后台得到的数据是null，查了半天原来发现实体类忘记添加get set方法了，添加上之后

 1 public class Book {
 2     private String bookName;
 3     private String price;
 4     private String bookSN;
 5 
 6     public String getBookName() {
 7         return bookName;
 8     }
 9 
10     public void setBookName(String bookName) {
11         this.bookName = bookName;
12     }
13 
14     public String getPrice() {
15         return price;
16     }
17 
18     public void setPrice(String price) {
19         this.price = price;
20     }
21 
22     public String getBookSN() {
23         return bookSN;
24     }
25 
26     public void setBookSN(String bookSN) {
27         this.bookSN = bookSN;
28     }
29 
30     @Override
31     public String toString() {
32         return "Book{" +
33                 "bookName=‘" + bookName + ‘‘‘ +
34                 ", price=‘" + price + ‘‘‘ +
35                 ", bookSN=‘" + bookSN + ‘‘‘ +
36                 ‘}‘;
37     }
38 }

数据获取正常了。