The error treatment and abnormal treatment of the Commons Beanutils Core framework in the Java library

The error treatment and abnormal treatment of the Commons Beanutils Core framework in the Java library Commons Beanutils Core is a tool widely used in the Java class library. It provides a simple way to access and modify the attributes of the Java object.This framework helps simplify the work of developers and improves the readability and maintenance of code.However, when using this framework, we also need to consider the problems of error treatment and abnormal processing to ensure the correctness and stability of the code.This article will introduce error treatment and abnormal processing in the Commons Beanutils Core framework, and provide some Java code examples. 1. Error treatment 1. Error treatment that does not exist in value: When using Commons Beanutils Core, we may try to access the attributes of an object, but the attribute does not exist.In order to avoid triggering NullPointerexception, we can use the method to determine whether a certain attribute is readable.The following is an example: if (PropertyUtils.isReadable(object, "propertyName")) { } else { // The process of processing the attribute does not exist } 2. Error treatment that does not match the attribute type: When we try to set a value into the attribute, if the type of the attribute is not matched with the type of the value, the RuntimeException exception will be thrown.To avoid this, we can use the method of obtaining attributes with the method of `Propertyutils.GetPropertyType ()` `` `) and check.The following is an example: if (PropertyUtils.getPropertyType(object, "propertyName").isAssignableFrom(value.getClass())) { // Set the value of the attribute PropertyUtils.setProperty(object, "propertyName", value); } else { // Treatment of non -matching attribute type } 3. Error treatment of attribute access permissions: When using Commons Beanutils Core, we may encounter the problem of access permissions of attributes.To avoid this, we can use the method to obtain the attribute with the method of `FieldUtils.getField (), and then use the method to check whether the access can be accessed.The following is an example: Field field = FieldUtils.getField(object.getClass(), "propertyName", true); if (field != null && FieldUtils.isAccessible(field)) { // Access attributes } else { // Treatment of access permissions } Second, abnormal treatment 1. Can't find the abnormal treatment of the attribute: When we try to access a non -existent attribute, the Commons Beanutils Core will throw out the abnormality of `noSuchmedhodexception`.To deal with this exception, we can use the `Try-Catch` statement before accessing the attribute to capture and handle the abnormalities, or use the method of the attribute to use the method of` methodutils.invokeExactMethTmthod (). If the method does not exist, the call fails.The following is an example: try { Object value = PropertyUtils.getProperty(object, "propertyName"); // Treat the attribute value } catch (NoSuchMethodException e) { // The process of processing the attribute does not exist } // or try { Object value = MethodUtils.invokeExactMethod(object, "getPropertyName", null); // Treat the attribute value } catch (NoSuchMethodException e) { // The process of processing the attribute does not exist } 2. Differential treatment of type conversion failure: When we try to set a value into the attribute, if the type conversion fails, the Commons Beanutils Core will throw out the exception.To deal with this exception, we can use the `Try-Catch` statement before setting the attribute to capture and handle the abnormalities, or use the` ConvertUTILS.CONVERT () method to make the type conversion.The following is an example: try { PropertyUtils.setProperty(object, "propertyName", value); // Process attribute settings successfully } catch (ConversionException e) { // Processing type conversion failure situation } // or try { Object convertedValue = ConvertUtils.convert(value, targetType); PropertyUtils.setProperty(object, "propertyName", convertedValue); // Process attribute settings successfully } catch (ConversionException e) { // Processing type conversion failure situation } 3. Other abnormal treatment: When using Commons Beanutils Core, other types of abnormalities may also be encountered, such as `` iLlegalaccessException`, `InvoryTargetexception`, etc.To deal with these abnormalities, we can use the `Try-Catch` statement to capture and handle the exception when using these methods to ensure the correct execution of the code. The above is some examples of error treatment and abnormal treatment of the Commons Beanutils Core framework in the Java library.By correcting errors and abnormalities, we can ensure the reliability and stability of the code.Although Commons Beanutils Core provides many convenient methods, we still need to pay attention to the problems of error treatment and abnormal processing when using it to ensure the correct operation of the code.