反射如何判断对象类型并实现强中类型转换

Posted 2022-06-14 neaos

public static List<Object> readCsvIntoVO(String readPath, Class<?> clazz) 
        List<Object> result = new ArrayList<>();
        Field[] fields = clazz.getDeclaredFields();


        try 
            // 以#分割
            CsvReader csvReader = new CsvReader(readPath,‘,‘, Charset.forName("UTF-8"));
            csvReader.readHeaders(); // 跳过表头   如果需要表头的话，不要写这句。
            String[] head = csvReader.getHeaders(); //获取表头
            while (csvReader.readRecord())
            
                Object record = clazz.newInstance();
                Map<String, String> map = new HashMap<String, String>();
                for (String s : head) 
                    String name = s.trim();
                    if (name.charAt(0) == ‘\uFEFF‘) 
                        name = name.substring(1);
                    
                    map.put(name,csvReader.get(s));
                    System.out.println(s + ":" + csvReader.get(s));
//                    String name = s.trim();
//                    for (Field field : fields) 
//                        field.setAccessible(true);
//
//                        if (name.equals(field.getName())) 
//                            Method method = clazz.getMethod("set" + name.substring(0, 1).toUpperCase() + name.substring(1), field.getType());
//                            method.invoke(record, StringUtils.get(field.getType(),csvReader.get(s)));
//                            break;
//                        
//                    


//                    Field f = record.getClass().getDeclaredField(s);
//                    f.setAccessible(true);
//                    f.set(record, csvReader.get(s));
                
                BeanUtils.populate(record, map);
                result.add(record);
            
            csvReader.close();
         catch (FileNotFoundException e) 
            throw new RuntimeException("文件未找到");
         catch (IOException e) 
            throw new RuntimeException(e.getMessage());
         catch (IllegalAccessException | InstantiationException | InvocationTargetException e) 
            e.printStackTrace();
        
        return result;