Struts2 knowledge accumulation

1. s: fielderror: output the specified error message instead of all error messages.

In the struts2 framework, for example, if an error message occurs during data type conversion and data validation, we will use the addFieldError method in the ActionSupport class to add the error message content. Use the <s: fielderror/> label on the JSP page to output error messages.

However, in actual development, <s: fielderror/> outputs all error messages. If you want to selectively output the specified error message. We can use the following code to solve the problem:
Method 1:

<S: fielderror> <s: param> field1 </s: param> <! -- Display the error message of the specified field1 field --> <s: param> field2 </s: param> <! -- Display the error message of the specified field2 field --> <s: fielderror/>

Method 2:

<S: fielderror fieldName = "field1"/> <! -- Display the error message of the specified field1 field --> <s: fielderror fieldName = "field2"/> <! -- Display the error message of the specified field2 field -->