ActionForm作为类型转换

<li>测试ActionForm类型转换器</li><br>
   <form action="typeconvert.do" method="post">
     intValue:<input type="text" name="intValue"><br>
     doubleValue:<input type="text" name="doubleValue"><br>
     booleanValue:<input type="text" name="booleanValue"><br>
     java.sql.Date:<input type="text" name="sqlDate"><br>
     java.util.Date:<input type="text" name="utilDate"><br>
     <input type="submit" value="提交">
   </form>

ActionForm：

package com.bjsxt.struts;

import org.apache.struts.action.ActionForm;

/**
* struts中的类型转换测试
* @author Administrator
*
*/
public class TypeConvertActionForm extends ActionForm {

private int intValue;

private double doubleValue;

private boolean booleanValue;

private java.sql.Date sqlDate;

private java.util.Date utilDate;

public int getIntValue() {
return intValue;
}

public void setIntValue(int intValue) {
this.intValue = intValue;
}

public double getDoubleValue() {
return doubleValue;
}

public void setDoubleValue(double doubleValue) {
this.doubleValue = doubleValue;
}

public boolean isBooleanValue() {
return booleanValue;
}

public void setBooleanValue(boolean booleanValue) {
this.booleanValue = booleanValue;
}

public java.sql.Date getSqlDate() {
return sqlDate;
}

public void setSqlDate(java.sql.Date sqlDate) {
this.sqlDate = sqlDate;
}

public java.util.Date getUtilDate() {
return utilDate;
}

public void setUtilDate(java.util.Date utilDate) {
this.utilDate = utilDate;
}
}

Action：

package com.bjsxt.struts;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

/**
* struts中的类型转换测试
* @author Administrator
*
*/
public class TypeConvertTestAction extends Action {

@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response)
   throws Exception {
  return mapping.findForward("success");
}

}

配置信息：

jsp页面：

<body>
intValue:${typeconvertForm.intValue }<br>
doubleValue:${typeconvertForm.doubleValue }<br>
booleanValue:${typeconvertForm.booleanValue }<br>
java.sql.dateValue:${typeconvertForm.sqlDate }<br>
java.util.utilValue:${typeconvertForm.utilDate }<br>
</body>

ActionForm在收集java.util.Date的时候不能转换，所以如果要转换到java.util.Date那么就要实现一个转换器，该转换器实现Convert类，实现convert方法，然后将转换器注册

package com.bjsxt.struts;

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

import org.apache.commons.beanutils.Converter;

/**
* java.util.Date类型转换器
* @author Administrator
*
*/
public class UtilDateConverter implements Converter {

public Object convert(Class type, Object value) {
  System.out.println("UtilDateConverter.value=" + value);
  if (value == null) {
   return value;
  }
  if (value instanceof Date) {
   return value;
  }
  Date d = null;

//将字符串转换为Date
  if (value instanceof String) {
   SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
   try {
    d = sdf.parse((String)value);
   } catch (ParseException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
  return d;
}

}

注册为插件：

package com.bjsxt.struts;

import java.util.Date;

import javax.servlet.ServletException;

import org.apache.commons.beanutils.ConvertUtils;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.action.PlugIn;
import org.apache.struts.config.ModuleConfig;

public class UtilDateConverterInitWithPlugin implements PlugIn {

public void destroy() {
}

public void init(ActionServlet servlet, ModuleConfig config)
   throws ServletException {
  System.out.println("UtilDateConverterInitWithPlugin.init()");
  ConvertUtils.register(new UtilDateConverter(), Date.class);
}
}

在struts-config.xml中配置：

<plug-in className="com.bjsxt.struts.UtilDateConverterInitWithPlugin"/>

ActionForm是一个数据传输对象(DTO)，vo是值对象(VO=DTO)

posted on 2011-02-13 22:25 魔战阅读(481) 评论(0) 收藏举报