springboot工具类

迈不过友情╰ 2021-10-14 00:34 338阅读 0赞

**ClassPathResource 在类路径下读取资源**

public final String getPath()  
public boolean exists()  
public InputStream getInputStream()

**WebUtils 获取web资源工具类**

public static String getRealPath(ServletContext servletContext, String path)  
public static Object getSessionAttribute(HttpServletRequest request, String name)  
public static File getTempDir(ServletContext servletContext)

**ServletRequestUtils 提供获取请求参数 并自动类型转换的功能**

public static Integer getIntParameter(ServletRequest request, String name)  
public static int\[\] getIntParameters(ServletRequest request, String name)  
public static Long getLongParameter(ServletRequest request, String name)

**StringUtils 提供对字符串操作的工具类**  
public static String\[\] split(String toSplit, String delimiter)  
public static String collectionToCommaDelimitedString(Collection<?> coll)  
public static boolean hasLength(String str)

**SerializationUtils 提供序列化与反序列化**  
public static byte\[\] serialize(Object object)  
public static Object deserialize(byte\[\] bytes)

**FactoryBean 通过实现该接口可以将我们自定义的Bean注入到Spring的容器当中去**  
public interface FactoryBean \{  
T getObject() throws Exception;  
Class<?> getObjectType();  
boolean isSingleton();  
\}

**ApplicationContextAware 实现这个接口可以将 ApplicationContext 注入进来**  
public interface ApplicationContextAware extends Aware \{  
void setApplicationContext(ApplicationContext applicationContext) throws BeansException;  
\}

**InitializingBean 实现该接口可以做一些初始化动作，afterPropertiesSet方法会在容器初始化后被自动调用**  
public interface InitializingBean \{  
void afterPropertiesSet() throws Exception;  
\}

**DisposableBean 实现该接口可以再Spring容器销毁时调用，可以在这个方法中做一些比如清理资源的动作**  
public interface DisposableBean \{  
void destroy() throws Exception;  
\}

**BeanNameAware 实现该接口，Spring容器在启动后会把当前Bean的名字注入进来**  
public interface BeanNameAware extends Aware \{  
void setBeanName(String name);  
\}

**ResourceLoaderAware 实现该接口可以注入ResourceLoader对象，通过它可以很方便的加载一些系统资源**  
public interface ResourceLoaderAware extends Aware \{  
void setResourceLoader(ResourceLoader resourceLoader);  
\}