Java反射实现List对象属性/值转换map

客官°小女子只卖身不卖艺 2023-10-02 15:55 14阅读 0赞

List<User> list = UserMapper.list();
                for (Object obj : list) {
                    Map<String, Object> map = new HashMap<>();
                    Method[] methods = obj.getClass().getMethods();
                    for (Method method : methods) {
                        if (method.getName().startsWith("get")) {
                            String name = method.getName().substring(3);
                            name = name.substring(0, 1).toLowerCase() +                                         name.substring(1);
                            String type = method.getReturnType().getName();
                            Object value = null;
                            // 时间类型格式化
                            if (method.invoke(obj) != null && type.equals("java.util.Date")) {
                                SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
                                Date date = new Date(method.invoke(obj).toString());
                                value = format.format(date);
                            } else {
                                value = method.invoke(obj);
                            }
                            map.put(name, value);
                        }
                    }
    
    
                    Map<String, Object> returnMap = new HashMap<>();
                    // key值转换(请忽略)
                    for (Map.Entry<String, Object> entry1 : mappingMap.entrySet()) {
                        boolean containsKey = map.containsKey(entry1.getKey());
                        if (containsKey) {
                            Object mapVal = map.get(entry1.getKey());
                            returnMap.put(entry1.getValue().toString(), mapVal);
                        } else {
                            returnMap.put(entry1.getKey(), "");
                        }
                    }
    
    
    
                    // bean通过反射获取属性/属性值
                    Field fields[]=class对象.getClass().getDeclaredFields();
                    String[] name=new String[fields.length];
                    Object[] value=new Object[fields.length];
                    try {
                        Field.setAccessible(fields, true);
                        for (int i = 0; i < name.length; i++) {
                        name[i] = fields[i].getName();
                        value[i] = fields[i].get(class对象);
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }