Springboot中@SuppressWarnings注解详细解析

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Springboot中@SuppressWarnings注解详细解析

2024-07-10 10:15| 来源: 网络整理| 查看: 265

目录前言1. 源码2. 抑制警告的值2. 代码示列

前言

@SuppressWarnings注解屏蔽一些错误警告，但不是代码错误，这个注解可以提高代码的安全性，防止为了解决这个错误警告而造成不可估量的后果

1. 源码

通过学习注解上的源码以及官方文档可以了解更加透彻

@Target({TYPE, FIELD, METHOD, PARAMETER, CONSTRUCTOR, LOCAL_VARIABLE}) @Retention(RetentionPolicy.SOURCE) public @interface SuppressWarnings { /** * The set of warnings that are to be suppressed by the compiler in the * annotated element. Duplicate names are permitted. The second and * successive occurrences of a name are ignored. The presence of * unrecognized warning names is not an error: Compilers must * ignore any warning names they do not recognize. They are, however, * free to emit a warning if an annotation contains an unrecognized * warning name. * *

The string {@code "unchecked"} is used to suppress * unchecked warnings. Compiler vendors should document the * additional warning names they support in conjunction with this * annotation type. They are encouraged to cooperate to ensure * that the same names work across multiple compilers. * @return the set of warnings to be suppressed */ String[] value(); }

通过@SuppressWarnings的源码可知，其注解目标为类、字段、函数、函数入参、构造函数和函数的局部变量

用于抑制编译器产生警告信息 2. 抑制警告的值值作用allto suppress all warnings （抑制所有警告）boxingto suppress warnings relative to boxing/unboxing operations （抑制装箱、拆箱操作时候的警告）castto suppress warnings relative to cast operations （抑制映射相关的警告）dep-annto suppress warnings relative to deprecated annotation （抑制启用注释的警告）deprecationto suppress warnings relative to deprecation （抑制过期方法警告）fallthroughto suppress warnings relative to missing breaks in switch statements （抑制确在switch中缺失breaks的警告）finallyto suppress warnings relative to finally block that don’t return （抑制finally模块没有返回的警告）hidingto suppress warnings relative to locals that hide variable（抑制相对于隐藏变量的局部变量的警告）incomplete-switchto suppress warnings relative to missing entries in a switch statement (enum case)（忽略没有完整的switch语句）nlsto suppress warnings relative to non-nls string literals（忽略非nls格式的字符）nullto suppress warnings relative to null analysis（忽略对null的操作）rawtypesto suppress warnings relative to un-specific types when using generics on class params（使用generics时忽略没有指定相应的类型）restrictionto suppress warnings relative to usage of discouraged or forbidden references（抑制禁止使用劝阻或禁止引用的警告）serialto suppress warnings relative to missing serialVersionUID field for a serializable class（忽略在serializable类中没有声明serialVersionUID变量）static-accessto suppress warnings relative to incorrect static access（抑制不正确的静态访问方式警告）synthetic-accessto suppress warnings relative to unoptimized access from inner classes（抑制子类没有按最优方法访问内部类的警告）uncheckedto suppress warnings relative to unchecked operations（抑制没有进行类型检查操作的警告）unqualified-field-accessto suppress warnings relative to field access unqualified（抑制没有权限访问的域的警告）unusedto suppress warnings relative to unused code（抑制没被使用过的代码的警告）

主要常用的值也就这几个

@SuppressWarnings("unchecked") 抑制单类型的警告@SuppressWarnings({"unchecked", "deprecated"}) 抑制多类型的警告@SuppressWarnings("all") 抑制所有类型的警告 deprecation 告诉编译器忽略过时的方法或类型检查 2. 代码示列 @SuppressWarnings("all") @RunWith(SpringRunner.class) @SpringBootTest public class UserTest { //定义StudentMapper @Autowired private UserMapper userDao; @Test public void testInsertStudent() { User user = new User(); user.setName("zs"); user.setEmail("zd.com"); user.setAge(20); int rows = userDao.insert(user); System.out.println("inserStudent rows:" + rows); } }

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Springboot中@SuppressWarnings注解详细解析

Springboot中@SuppressWarnings注解详细解析

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