spring mvc使用@InitBinder标签对表单数据绑定的方法

import org.springframework.beans.propertyeditors.PropertiesEditor;  
public class DoubleEditor extends PropertiesEditor {  
  @Override  
  public void setAsText(String text) throws IllegalArgumentException {  
    if (text == null || text.equals("")) {  
      text = "0";  
    }  
    setValue(Double.parseDouble(text));  
  }  
  
  @Override  
  public String getAsText() {  
    return getValue().toString();  
  }  
}  

import org.springframework.beans.propertyeditors.PropertiesEditor; 
public class IntegerEditor extends PropertiesEditor {  
  @Override  
  public void setAsText(String text) throws IllegalArgumentException {  
    if (text == null || text.equals("")) {  
      text = "0";  
    }  
    setValue(Integer.parseInt(text));  
  }  
  
  @Override  
  public String getAsText() {  
    return getValue().toString();  
  }  
}  

import org.springframework.beans.propertyeditors.PropertiesEditor;  
public class FloatEditor extends PropertiesEditor {  
  @Override  
  public void setAsText(String text) throws IllegalArgumentException {  
    if (text == null || text.equals("")) {  
      text = "0";  
    }  
    setValue(Float.parseFloat(text));  
  }  
  
  @Override  
  public String getAsText() {  
    return getValue().toString();  
  }  
}  

import org.springframework.beans.propertyeditors.PropertiesEditor; 
public class LongEditor extends PropertiesEditor {  
  @Override  
  public void setAsText(String text) throws IllegalArgumentException {  
    if (text == null || text.equals("")) {  
      text = "0";  
    }  
    setValue(Long.parseLong(text));  
  }  
  
  @Override  
  public String getAsText() {  
    return getValue().toString();  
  }  
} 

@InitBinder  
  protected void initBinder(WebDataBinder binder) {  
    binder.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"), true));  
/    binder.registerCustomEditor(int.class, new CustomNumberEditor(int.class, true));  
    binder.registerCustomEditor(int.class, new IntegerEditor());  
/    binder.registerCustomEditor(long.class, new CustomNumberEditor(long.class, true)); 
    binder.registerCustomEditor(long.class, new LongEditor());  
    binder.registerCustomEditor(double.class, new DoubleEditor());  
    binder.registerCustomEditor(float.class, new FloatEditor());  
  }