struts 类型转换器

类型转换

（来自尚学堂）

 

a)      默认转换

i.       日期处理

b)      写自己的转换器：

public class MyPointConverter extends DefaultTypeConverter{

 

         @Override

         public Object convertValue(Object value, Class toType) {

                   if(toType == Point.class) {

                            Point p = new Point();

                            String[] strs = (String[])value;

                            String[] xy = strs[0].split(",");

                            p.x = Integer.parseInt(xy[0]);

                            p.y = Integer.parseInt(xy[1]);

                            return p;

                   }

                   if(toType == String.class) {

                            return value.toString();

                   }

                   return super.convertValue(value, toType);

         }

 

}

public class MyPointConverter extends StrutsTypeConverter{

 

 

 

         @Override

         public Object convertFromString(Map context, String[] values, Class toClass) {

                  

                            Point p = new Point();

                            String[] strs = (String[])values;

                            String[] xy = strs[0].split(",");

                            p.x = Integer.parseInt(xy[0]);

                            p.y = Integer.parseInt(xy[1]);

                            return p;

                  

                  

         }

 

         @Override

         public String convertToString(Map context, Object o) {

                   // TODO Auto-generated method stub

                   return o.toString();

         }

 

}

 

c)      三种注册方式：

i.       局部：XXXAction-conversion.properties

1.      p（属性名称） =  converter

ii.      全局：xwork-conversion.properties

1.      com.xxx.XXX（类名）= converter

iii.     Annotation

d)      如果遇到非常麻烦的映射转换

i.       request.setAttribute();

ii.      session