No.8
Java线程池的创建
Java
2023-11-28
public static void main(String[] args) {
    //创建一个工作队列
    BlockingQueue weekQueue = new LinkedBlockingQueue<>(3);
    //创建一个线程创建工程
    ThreadFactory threadFactory = new ThreadFactoryBuilder().setNameFormat("demo-pool-%d").build();

    //创建一个核心线程5 最大线程10 空闲线程等待1分钟的线程池
    ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(3, 5, 1,
            TimeUnit.MINUTES, weekQueue, threadFactory, new ThreadPoolExecutor.AbortPolicy());


    for (int i = 0; i < 10; i++) {
        DemoTask demoTask = new DemoTask(i);
        try{
            threadPoolExecutor.execute(demoTask);
        }catch (Exception exception){
            exception.printStackTrace();
            threadPoolExecutor.shutdown();
        }
    }
    
}
JavaJava线程池的创建
No.7
在Java中创建一个日志打印对象
Java
2023-11-28
private static final Logger logger = LoggerFactory.getLogger(LoggerDemo.class);
Java在Java中创建一个日志打印对象
No.6
springboot项目配置日志级别
xml
2023-11-17
logging:
  level:
    com.examlple.test: debug
xmlspringboot项目配置日志级别
No.5
一个接口统一返回对象
Java
2023-11-17
@Data
public class BaseResponse{

    public static final int SUCCESS_CODE = 0;
    public static final int SYS_ERROR_CODE = 999;

    /**
     * 请求处理状态
     */
    private Integer errorCode;
    /**
     * 提示信息
     */
    private String message;
    /**
     * 错误异常信息
     */
    private String errorMessage;
    /**
     * 返回数据
     */
    private T data;


    public static  BaseResponse response(Integer code, String message, String errorMessage, R data){
        BaseResponse response = new BaseResponse<>();
        response.setErrorCode(code);
        response.setMessage(message);
        response.setErrorMessage(errorMessage);
        response.setData(data);
        return response;
    }

    public static  BaseResponse success(R data){
        return BaseResponse.response(BaseResponse.SUCCESS_CODE, "success", null, data);
    }

    public static  BaseResponse success(){
        return success(null);
    }

    public static  BaseResponse fail(String errorMessage){
        return BaseResponse.response(BaseResponse.SYS_ERROR_CODE, null, errorMessage, null);
    }

    public static  BaseResponse fail(String message, String errorMessage){
        return BaseResponse.response(BaseResponse.SYS_ERROR_CODE, message, errorMessage, null);
    }

    public static  BaseResponse fail(Integer errorCode, String errorMessage){
        return BaseResponse.response(errorCode, null, errorMessage, null);
    }
    public static  BaseResponse fail(){
        return fail(null);
    }
}
Java一个接口统一返回对象
No.4
SpringBean操作类
Java
2023-11-17
@Component
public class SpringContextUtils implements ApplicationContextAware {

    private static ApplicationContext applicationContext ;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextUtils.applicationContext = applicationContext;
    }

    public static  T getBean(String beanName, Class clazz){
        return applicationContext.getBean(beanName, clazz);
    }

    public static  T getBean(Class clazz){
        return applicationContext.getBean(clazz);
    }
}
JavaSpringBean操作类
No.3
Spring获取请求Request
Java
2023-11-13
public static HttpServletRequest request(){
    RequestAttributes attributes = RequestContextHolder.getRequestAttributes();
    if (Objects.isNull(attributes)) {
        throw new RuntimeException("RequestAttributes is empty!");
    }
    ServletRequestAttributes requestAttributes = (ServletRequestAttributes) attributes;
    return requestAttributes.getRequest();
}
JavaSpring获取请求Request
No.2
一个Jackson的json工具类
Java
2023-11-13
public class JsonUtils {
    public static final ObjectMapper OBJECT_MAPPER;

    static {
        OBJECT_MAPPER = new ObjectMapper();
        OBJECT_MAPPER.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
        OBJECT_MAPPER.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
        OBJECT_MAPPER.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
        OBJECT_MAPPER.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        OBJECT_MAPPER.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
        OBJECT_MAPPER.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        OBJECT_MAPPER.findAndRegisterModules();
    }

    public static String toJsonString(Object object){
        try {
            return OBJECT_MAPPER.writeValueAsString(object);
        } catch (JsonProcessingException e) {
            throw new RuntimeException(e);
        }
    }

    public static  T parse(String jsonString, Class clazz){
        try {
            return OBJECT_MAPPER.readValue(jsonString, clazz);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static  List parseArray(String countInfo, Class clazz) {
        try {
            JavaType javaType = OBJECT_MAPPER.getTypeFactory().constructParametricType(List.class, clazz);
            return OBJECT_MAPPER.readValue(countInfo, javaType);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static  List parseArrayNull(String countInfo, Class clazz) {
        try {
            if (StringUtils.isBlank(countInfo)){
                return Lists.newArrayList();
            }
            JavaType javaType = OBJECT_MAPPER.getTypeFactory().constructParametricType(List.class, clazz);
            return OBJECT_MAPPER.readValue(countInfo, javaType);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
Java一个Jackson的json工具类
No.1
Spring跨域统一处理代码
Java
2023-11-13
@Configuration
public class CorsConfig {

    @Bean
    public CorsFilter corsFilter(){
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.setAllowCredentials(false);
        corsConfiguration.addAllowedHeader("*");
        corsConfiguration.addAllowedOrigin("*");
        corsConfiguration.addAllowedMethod("GET");
        corsConfiguration.addAllowedMethod("POST");
        corsConfiguration.addAllowedMethod("PUT");
        corsConfiguration.addAllowedMethod("DELETE");
        corsConfiguration.addAllowedMethod("OPTIONS");
        source.registerCorsConfiguration("/**", corsConfiguration);
        return new CorsFilter(source);
    }
}
JavaSpring跨域统一处理代码
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