import org.apache.tapestry.IMarkupWriter;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.TapestryUtils;
import org.apache.tapestry.form.FormComponentContributorContext;
import org.apache.tapestry.form.IFormComponent;
import org.apache.tapestry.form.ValidationMessages;
import org.apache.tapestry.form.validator.BaseValidator;
import org.apache.tapestry.valid.ValidatorException;

public class MyValidater extends BaseValidator {
//用户得输入内容
 private String name;

 /**
  * @return the name
  */
 public String getName() {
  return name;
 }

 /**
  * @param name
  *            the name to set
  */
 public void setName(String name) {
  this.name = name;
 }

 public MyValidater() {

 }

 public MyValidater(String string) {
  super(string);
 }

//实现验证方法
 public void validate(IFormComponent field, ValidationMessages messages,
   Object object) throws ValidatorException {
  String str = object.toString();
  if (!str.equals(name))
   throw new ValidatorException(messages.formatValidationMessage(
     getMessage(), "invalid-format", new Object[] {
       field.getDisplayName(), null }));
 }
}

2.ok，修改hivemodule.xml 文件，添加以下代码

    <contribution configuration-id="tapestry.form.validator.Validators">
       <validator name="name" configurable="true" class="org.appfuse.webapp.tapestry.MyValidater"/>
   </contribution>

import java.util.Locale;

import org.apache.tapestry.form.IFormComponent;
import org.apache.tapestry.form.ValidationMessages;
import org.apache.tapestry.form.translator.AbstractTranslator;
import org.apache.tapestry.valid.ValidatorException;

public class FullToHalfTranslator extends AbstractTranslator{

//这个方法在页面文件render的时候执行。你可以在这里调用自己的方法，来实现需要的转换。在这里JapanEncodeUtil.toHalf方法是我自己定义的一个实现全角文字转化成半角文字的方法，具体代码没必要贴出来了。

 protected String formatObject(IFormComponent arg0, Locale arg1, Object arg2) {
     String str = JapanEncodeUtil.toHalf(arg2.toString());
     return str;
 }

//这个方法在页面文件submit的时候调用。

 protected Object parseText(IFormComponent field, ValidationMessages message, String text) throws ValidatorException {
     return JapanEncodeUtil.toHalf(text);
 }

}