Layered progressive Struts1 (vi) Custom converters

The type conversions provided by struts are limited, and if we forcibly use the type conversions that are not available, an error occurs, taking the date type as an example:

Org.apache.catalina.core.StandardWrapperValve invoke  
severity: Servlet.service () for Servlet action threw exception  
      
Java.lang.IllegalArgumentException:Cannot invoke 

com.tgb.struts1.TypeCovertActionForm.setUtilDate- Argument type mismatch

Here we set up the Java.util.Date converter.

Servlet version Converter

Data converter, the code is as follows:

Package com.tgb.struts1;  
      
Import Java.text.SimpleDateFormat;  
Import java.util.Date;  
      
Import org.apache.commons.beanutils.ConversionException;  
      
Import Com.sun.org.apache.commons.beanutils.Converter;  
      
public class Utildateconverter implements Org.apache.commons.beanutils.Converter {public  
      
    Object convert (class Type, Object value {  
      
      
        if (value instanceof Date) {return  
            (value);  
        }  
        Date Date=null;  
    if (value instanceof string) {  
        try {  
            date=new simpledateformat ("Yyy-mm-dd"). Parse ((String) value);  
        catch (Exception e) {  
            e.printstacktrace ();  
        }  
        }  
    Return date  
    }  
}

Servlet

In order to register the above converter in Convertutils:

Package 

Com.tgb.struts1;  
      
Import javax.servlet.ServletException;  
Import Javax.servlet.http.HttpServlet;  
      
Import Org.apache.commons.beanutils.ConvertUtils;  
      
public class Utilservlet extends HttpServlet {public  
          
    void init () throws Servletexception  
    {  
            Convertutils.register (New Utildateconverter (), java.util.Date.class);  
    }  

Configuration file

Add the configuration in Web.xml because the converter is loaded at Tomcat startup, so here you set the Load-on-startup to a value greater than 0:

<servlet>  
        <servlet-name>UtilServlet</servlet-name>  
        <servlet-class> com.tgb.struts1.utilservlet</servlet-class>  
        <load-on-startup>10</load-on-startup>  
  </servlet>

Test

Jsp

 
Results