java 泛型

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);
                    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);
                    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);
                    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);
                    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);    
                    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);                    
                    Date value = (Date) m.invoke(model);
                    if(value != null){
                        System.out.println("attribute value:"+value.toLocaleString());
                    }
                }                
            }
    }