J2EE反射机制取多类型Class（续）

 

改进Tools.java工具类

import java.lang.reflect.Field; import java.lang.reflect.Method; import javax.servlet.http.HttpServletRequest; import org.apache.commons.beanutils.ConvertUtils; public class Tools {     public static Object initBean(Class cls,HttpServletRequest request)     {         Object o = null;         try {             o = cls.newInstance();             Field[] fields = cls.getDeclaredFields();                          for (Field field : fields) {                 String fieldName = field.getName();                 Method method = cls.getDeclaredMethod("set"+fieldName.substring(0,1).toUpperCase()+fieldName.substring(1), new Class[]{field.getType()});                 String value = request.getParameter(fieldName);                 if(value==null) continue;                 method.invoke(o, new Object[]{ConvertUtils.convert(value, field.getType())});             }         } catch (Exception e) {             // TODO: handle exception             System.out.println(e);         }         return o;     }          public static void main(String[] args) throws Exception {         Class cls = Class.forName("com.accp.bean.UserinfoBean");         Object o = cls.newInstance();         Field[] fields = cls.getDeclaredFields();                  for (Field field : fields) {             String fieldName = field.getName();             Method method = cls.getDeclaredMethod("set"+fieldName.substring(0,1).toUpperCase()+fieldName.substring(1), new Class[]{field.getType()});             String value = "1";             method.invoke(o, new Object[]{ConvertUtils.convert(value, field.getType())});         }     } }

 

里面有两行代码我们进行了改进，使其可以动态调用非纯String类型的类

一：Method method = cls.getDeclaredMethod("set"+fieldName.substring(0,1).toUpperCase()+fieldName.substring(1), new Class[]{field.getType()});  我们原来的代码在最后是 new Class[]{String.Class}

二：在反射调用的时候用了method.invoke(o, new Object[]{ConvertUtils.convert(value, field.getType())}); 我们原来的代码在最后是 new Object[]{value}

最重要的是我们要导入  数据类型强制转换器的那个包  具体做法：

    顺次打开：Borland/JBuilder2006/thirdparty/jakarta-struts-1.1-lib

    把里面的十个压缩包复制，放在我们工程下（自己建立一个lib文件夹放里面）

   然后：右键工程-bulid Path-Configure bulid Path-点击进去后在里面的Libraries点击Add JARS 选择刚才放进来的包 OK 刷新