java中遍历实体类属性和类型

转载自：http://hi.baidu.com/zccbestluck/blog/item/2f943f10bd57d0936538dba1.html

这个方法使用到了java.lang.reflect包的Field类，Method类。

    此方法遍历实体类所有属性，对于常用的java包装类类型和java.util.Date，输出其属性值，如果有其它类型，则需自己扩展。

public static void testReflect(Object model) throws NoSuchMethodException, IllegalAccessException, IllegalArgumentException, InvocationTargetException{

        Field[] field = model.getClass().getDeclaredFields();        //获取实体类的所有属性，返回Field数组  

            for(int j=0 ; j<field.length ; j++){     //遍历所有属性

                String name = field[j].getName();    //获取属性的名字

                 System.out.println("attribute name:"+name);                

                String type = field[j].getGenericType().toString();    //获取属性的类型

                if(type.equals("class java.lang.String")){   //如果type是类类型，则前面包含"class "，后面跟类名

                    Method m = model.getClass().getMethod("get" + name.substring(0,1).toUpperCase() + name.substring(1) );

                    String value = (String) m.invoke(model);    //调用getter方法获取属性值

                    if(value != null){

                        System.out.println("attribute value:"+value);

                    }

                }

                if(type.equals("class java.lang.Integer")){     

                    Method m = model.getClass().getMethod("get" + name.substring(0,1).toUpperCase() + name.substring(1) );

                    Integer value = (Integer) m.invoke(model);

                    if(value != null){

                        System.out.println("attribute value:"+value);

                    }

                }

                if(type.equals("class java.lang.Short")){     

                    Method m = model.getClass().getMethod("get" + name.substring(0,1).toUpperCase() + name.substring(1) );

                    Short value = (Short) m.invoke(model);

                    if(value != null){

                        System.out.println("attribute value:"+value);                    }

                }       

                if(type.equals("class java.lang.Double")){     

                    Method m = model.getClass().getMethod("get" + name.substring(0,1).toUpperCase() + name.substring(1) );

                    Double value = (Double) m.invoke(model);

                    if(value != null){                    

                        System.out.println("attribute value:"+value);  

                    }

                }                  

                if(type.equals("class java.lang.Boolean")){

                    Method m = model.getClass().getMethod("get" + name.substring(0,1).toUpperCase() + name.substring(1) );    

                    Boolean value = (Boolean) m.invoke(model);

                    if(value != null){                      

                        System.out.println("attribute value:"+value);

                    }

                }

                if(type.equals("class java.util.Date")){

                    Method m = model.getClass().getMethod("get" + name.substring(0,1).toUpperCase() + name.substring(1) );                    

                    Date value = (Date) m.invoke(model);

                    if(value != null){

                        System.out.println("attribute value:"+value.toLocaleString());

                    }

                }                

            }

    }