struts1的转换器

//MyActionServlet的代码

package com.actions;

import java.util.Date;

import javax.servlet.ServletException;

import org.apache.commons.beanutils.ConvertUtils;
import org.apache.struts.action.ActionServlet;

import com.convert.DateConvert;

public class MyActionServlet extends ActionServlet {

@Override
public void init() throws ServletException {
//这是注册这个转换器，因为ConvertUtils里面有很多转换器

super.init();
//这句话必须放在Init的后面，因为读actionServlet的源代码会发现，如果你设置了convertNUll = true,那么首先会把所有的转换器全部删掉，
//然后再注册这些默认的转换器，如果线面代码放在init的前面，那么也会把这个转换器删掉，那么还是会出错。因为formBean的java.util.Date还是不能转换。
ConvertUtils.register(new DateConvert(), Date.class);
}
}

//action的代码

/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package com.actions;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;
import com.forms.UserForm;

public class UserAction extends DispatchAction {

public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
UserForm userForm = (UserForm) form;

return new ActionForward("/user.jsp");
}
}

//convert的代码

package com.convert;

import java.sql.Date;
import java.text.ParseException;
import java.text.SimpleDateFormat;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.Converter;

//这个类是将页面传过来的字符窜转换成某个类型
public class DateConvert implements Converter {

//其实我经过测试，struts1是不能进行双向转换器的

public Object convert(Class clazz, Object arg1) {
//如果桌面的日期的书写形式是yyyy/MM/dd，那么我们这里的格式化形式就是这种类型，如果是其他的形式就是其他的形式
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");

// if(clazz == String.class)
// {

   String des = (String)arg1;
   java.util.Date date = null;
   try {
    //这是将String类型转换成Date类型
    date = simpleDateFormat.parse(des);
   } catch (ParseException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
    return date;
// }
// else if(clazz == Date.class)
// {
//   Date des = (Date)arg1;
//   java.lang.String date = null;
//   try {
//    //这是将日期转换成string类型
//    date = simpleDateFormat.format(des);
//   } catch (Exception e) {
//    // TODO Auto-generated catch block
//    e.printStackTrace();
//   }
//    return date;
// }
// else
//   return null;
}

}

//form的代码

/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package com.forms;

import java.util.Date;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;

public class UserForm extends ActionForm {

private Date date;
private String name;
private int id;
public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public ActionErrors validate(ActionMapping mapping,
HttpServletRequest request) {
return null;
}

public void reset(ActionMapping mapping, HttpServletRequest request) {
// TODO Auto-generated method stub
}

public Date getDate() {
return date;
}

public void setDate(Date date) {
this.date = date;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}
}

//web.xml的代码

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.5" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>com.actions.MyActionServlet</servlet-class>
    <init-param>
    
      <param-name>convertNull</param-name>
      <param-value>1</param-value>
    </init-param>
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
    <init-param>
      <param-name>debug</param-name>
      <param-value>3</param-value>
    </init-param>
    <init-param>
      <param-name>detail</param-name>
      <param-value>3</param-value>
    </init-param>
    <load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

//struts-config的代码

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd">

<struts-config>
<data-sources />
<form-beans >
<form-bean name="userFo

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