遍历java对象中的属性

客官°小女子只卖身不卖艺 2022-03-29 18:52 374阅读 0赞

public static void Reflect(Object obj) throws NoSuchMethodException, IllegalAccessException, IllegalArgumentException, InvocationTargetException{
            Field[] field = obj.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 fname = field[j].getName();    //获取属性名称
                    
                    System.out.println("attribute fname:"+fname);     
                    fname = fname.substring(0,1).toUpperCase()+fname.substring(1); //将属性的首字符大写，方便构造get，set方法
                    String ftype = field[j].getGenericType().toString();    //获取属性的类型
                    if(ftype.equals("class java.lang.String")){   //如果ftype是类类型，则前面包含"class "，后面跟类名
                        Method m = obj.getClass().getMethod("get"+fname);
                        String value = (String) m.invoke(obj);    //利用反射原理，调用getter方法获取属性值
                        if(value != null){
    						//对属性值的操作逻辑（如改变编码）	
                            System.out.println("attribute value:"+value);
                        }
                    }
                    if(ftype.equals("class java.lang.Integer")){     
                        Method m = obj.getClass().getMethod("get"+fname);
                        Integer value = (Integer) m.invoke(obj);
                        if(value != null){
                            System.out.println("attribute value:"+value);
                        }
                    }
                    if(ftype.equals("class java.lang.Short")){     
                        Method m = obj.getClass().getMethod("get"+fname);
                        Short value = (Short) m.invoke(obj);
                        if(value != null){
                            System.out.println("attribute value:"+value);                    }
                    }       
                    if(ftype.equals("class java.lang.Double")){     
                        Method m = obj.getClass().getMethod("get"+fname);
                        Double value = (Double) m.invoke(obj);
                        if(value != null){                    
                            System.out.println("attribute value:"+value);  
                        }
                    }                  
                    if(ftype.equals("class java.lang.Boolean")){
                        Method m = obj.getClass().getMethod("get"+fname);    
                        Boolean value = (Boolean) m.invoke(obj);
                        if(value != null){                      
                            System.out.println("attribute value:"+value);
                        }
                    }
                    if(ftype.equals("class java.util.Date")){
                        Method m = obj.getClass().getMethod("get"+fname);                    
                        Date value = (Date) m.invoke(obj);
                        if(value != null){
                            System.out.println("attribute value:"+value.toLocaleString());
                        }
                    }                
                }
        }