表单到VO值对象的映射（转载）

  项目中，往往有从表单到值对象的映射。
以下是一个通用的类：

public class ObjectMapping
{
	/**
	 * 映射html表单为对应的ｖｏ对象，当前可以映射String,int,double,boolean,float
	 * @param 对应的ｖｏ对象
	 * @param request HttpServletRequest
	 * @return 映射后的对象
	 */
	public static Object mappingFieldsToObject(Class c, HttpServletRequest request)
	{
		// 得到所有的请求参数
		Enumeration enums = request.getParameterNames();
		Object o = null;
		try
		{
			o = c.newInstance();
		}
		catch (InstantiationException e1)
		{
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		catch (IllegalAccessException e1)
		{
			e1.printStackTrace();
		}
		// 从JavaBean中得到所有的方法
		Method[] methods = c.getDeclaredMethods();
		String tem1 = "";
		while (enums.hasMoreElements())
		{
			tem1 = (String) enums.nextElement();
			if (tem1 != null && !"".equals(tem1))
			{
				String methodName = "set" + tem1.substring(0, 1).toUpperCase();
				if (tem1.length() > 1)
				{
					methodName += tem1.substring(1);
				}
				for (int i = 0; i < methods.length; i++)
				{
					if (methodName.equals(methods[i].getName()))
					{
						Method method = methods[i];
						if (method.getParameterTypes()[0] == String.class)
						{
							String param = null2String(request
									.getParameter(tem1));
							try
							{
								method.invoke(o, new Object[]{param});
							}
							catch (Exception e)
							{
								e.printStackTrace();
								System.out.println("注入值时出错");
							}

						}
						else if (method.getParameterTypes()[0] == int.class)
						{
							String param = null2Zero(request.getParameter(tem1));
							Integer intParam = null;
							try
							{
								intParam = Integer.valueOf(param);
							}
							catch (NumberFormatException e1)
							{
								intParam = new Integer(0);
							}
							try
							{
								method.invoke(o, new Object[]
								{
									intParam
								});
							}
							catch (Exception e)
							{
								e.printStackTrace();
								System.out.println("注入值时出错");
							}

						}
						else if (method.getParameterTypes()[0] == float.class)
						{
							String param = null2Zero(request.getParameter(tem1));
							Float floatParam = null;
							try
							{
								floatParam = Float.valueOf(param);
							}
							catch (NumberFormatException e1)
							{
								floatParam = new Float(0.0F);
							}
							try
							{
								method.invoke(o, new Object[]
								{
									floatParam
								});
							}
							catch (Exception e)
							{
								e.printStackTrace();
								System.out.println("注入值时出错");
							}

						}
						else if (method.getParameterTypes()[0] == double.class)
						{
							String param = null2Zero(request.getParameter(tem1));
							Double doubleParam = null;
							try
							{
								doubleParam = Double.valueOf(param);
							}
							catch (NumberFormatException e1)
							{
								doubleParam = new Double(0);
							}
							try
							{
								method.invoke(o, new Object[]
								{
									doubleParam
								});
							}
							catch (Exception e)
							{
								e.printStackTrace();
								System.out.println("注入值时出错");
							}

						}
						else if (method.getParameterTypes()[0] == boolean.class)
						{
							String param = null2String(request
									.getParameter(tem1));
							if (!"true".equals(param))
							{
								param = "false";
							}
							Boolean booleanParam = Boolean.valueOf(param);
							try
							{
								method.invoke(o, new Object[]
								{
									booleanParam
								});
							}
							catch (Exception e)
							{
								e.printStackTrace();
								System.out.println("注入值时出错");
							}
						}
						break;
					}

				}
			}

		}
		return o;
	}

	private static String null2Zero(String str)
	{
		if (str == null || "".equals(str.trim()))
		{
			return "0";
		}
		return str.trim();
	}

	private static String null2String(String str)
	{
		if (str == null)
		{
			return "";
		}
		return str.trim();
	}

}