java中两个不同类型的类转换

今天药忘吃喽~ 2022-11-15 11:45 307阅读 0赞

## java中两个不同类型的类转换 ##

最近在做项目改造时,需要两个类型转换， 使用BeanUtils.copyProperties()转换时，发现属性的类型不一样是无法转换的，就自己实现了  
maven依赖

<dependency>
          <groupId>commons-beanutils</groupId>
          <artifactId>commons-beanutils</artifactId>
          <version>1.9.4</version>
        </dependency>

User1.class

@Data
    public class User1 { 
      private String id;
      private String name;
      private BigDecimal money;
    }

**User2类及转换的方法**

@Data
    public class User2 { 
    
      private Long id;
      private String name;
      private Long money;
    
    
      public static void main(String[] args) { 
    
        testCopyProperties();
        testSet();
      }
    
      private static void testCopyProperties() { 
        User1 user1 = new User1();
        user1.setId("1");
        user1.setName("张三");
        user1.setMoney(new BigDecimal("555"));
        long start = System.currentTimeMillis();
        User2 user2 = new User2();
        copyProperties(user1, user2);
        long end = System.currentTimeMillis();
        System.out.println("copyProperties的需要的时间：" + (end - start));
        System.out.println(user2);
    
      }
    
    
      private static void testSet() { 
        User1 user1 = new User1();
        user1.setId("1");
        user1.setName("张三");
        user1.setMoney(new BigDecimal("555"));
        long start = System.currentTimeMillis();
        User2 user2 = new User2();
        user2.setId(Long.parseLong(user1.getId()));
        user2.setName(user1.getName());
        user2.setMoney(user1.getMoney().longValue());
        long end = System.currentTimeMillis();
        System.out.println("Set的需要的时间：" + (end - start));
        System.out.println(user2);
      }
    
      /** * 类型转换 * @param source * @param target */
      public static void copyProperties(Object source, Object target) { 
        Map<String, String> sourceMap = new HashMap<>();
        BeanMap beanMap = new BeanMap(source);
        for (Object key : beanMap.keySet()) { 
          if ("class".equals(key)) { 
            continue;
          }
          if (null != beanMap.get(key)) { 
            sourceMap.put(key.toString(), beanMap.get(key).toString());
          }
        }
        BeanMap targetMap = new BeanMap(target);
        targetMap.putAll(sourceMap);
      }
    
    }

**结果截图**不过性能有点下降，偷懒是付出代价的，哈哈哈  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMTk4MDA0_size_16_color_FFFFFF_t_70]

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