架构探险——学到的知识
一.常用到的工具类
1.用于编码和解码的工具类
/** * 编码与解码操作工具类 * * @author solverpeng * @create 2016-06-23-21:54 */ public final class CodecUtil { private static final Logger LOGGER = LoggerFactory.getLogger(CodecUtil.class); /** * 将 URL 编码 */ public static String encodeURL(String source) { String target; try { target = URLEncoder.encode(source, "UTF-8"); } catch(UnsupportedEncodingException e) { LOGGER.error("encode url failure", e); throw new RuntimeException(e); } return target; } /** * 将URL解码 */ public static String decodeURL(String source) { String target; try { target = URLDecoder.decode(source, "UTF-8"); } catch(UnsupportedEncodingException e) { LOGGER.error("decode url failure", e); throw new RuntimeException(e); } return target; } }
2.POJO 和 JSON 之间的相互转换
/** * JSON工具类 * * @author solverpeng * @create 2016-06-24-11:54 */ public final class JsonUtil { private static final Logger LOGGER = LoggerFactory.getLogger(JsonUtil.class); private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper(); /** * 将 POJO 转换为 JSON */ public static <T> String toJson(T obj) { String json; try { json = OBJECT_MAPPER.writeValueAsString(obj); } catch(JsonProcessingException e) { LOGGER.error("convert POJO to JSON failure", e); throw new RuntimeException(e); } return json; } /** * 将 JSON 转换为 POJO */ public static <T> T fromJson(String json, Class<T> type) { T pojo; try { pojo = OBJECT_MAPPER.readValue(json, type); } catch(IOException e) { LOGGER.error("convert JSON to POJO failure", e); throw new RuntimeException(e); } return pojo; } }
3.反射工具类
/** * 反射工具类 * * @author solverpeng * @create 2016-06-23-18:06 */ public final class ReflectionUtil { private static final Logger LOGGER = LoggerFactory.getLogger(ReflectionUtil.class); /** * 创建实例 */ public static Object newInstance(Class<?> cls) { Object instance; try { instance = cls.newInstance(); } catch(Exception e) { LOGGER.error("new instance failure", e); throw new RuntimeException(e); } return instance; } /** * 调用方法 */ public static Object invokeMethod(Object obj, Method method, Object... args) { Object result; try { method.setAccessible(true); result = method.invoke(obj, args); } catch(Exception e) { LOGGER.error("invoke method failure", e); throw new RuntimeException(e); } return result; } /** * 设置属性 */ public static void setField(Object obj, Field field, Object value) { try { field.setAccessible(true); field.set(obj, value); } catch(IllegalAccessException e) { LOGGER.error("set field failure", e); throw new RuntimeException(e); } } }
二.其他的知识
1.注解开发
/** * Action方法注解 * * @author solverpeng * @create 2016-06-23-16:58 */ @Target(ElementType.METHOD) @Retention(RetentionPolicy.RUNTIME) public @interface Action { /** * 请求类型与路径 */ String value(); } /** * 控制器注解 * * @author solverpeng * @create 2016-06-23-16:57 */ @Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) public @interface Controller {} /** * 依赖注入注解 * * @author solverpeng * @create 2016-06-23-17:02 */ @Target(ElementType.FIELD) @Retention(RetentionPolicy.RUNTIME) public @interface Inject {} /** * 服务类注解 * * @author solverpeng * @create 2016-06-23-17:00 */ @Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) public @interface Service {}
2.异常和日志的处理
private static final Logger LOGGER = LoggerFactory.getLogger(CodecUtil.class); /** * 将 URL 编码 */ public static String encodeURL(String source) { String target; try { target = URLEncoder.encode(source, "UTF-8"); } catch(UnsupportedEncodingException e) { LOGGER.error("encode url failure", e); throw new RuntimeException(e); } return target; }
3.配置文件的定义
smart.framework.jdbc.driver=com.mysql.jdbc.Driver smart.framework.jdbc.url=jdbc:mysql://localhost:3306/demo smart.framework.jdbc.username=root smart.framework.jdbc.password=123456 smart.framework.app.base_package=com.nucsoft.chapter2 smart.framework.app.jsp_path=/WEB-INF/view/ #表示静态资源文件的基础路径 smart.framework.app.asset_path=/asset/
/** * 提供相关配置常量类 * * @author solverpeng * @create 2016-06-23-14:31 */ public interface ConfigConstant { String CONFIG_FILE = "smart.properties"; String JDBC_DRIVER = "smart.framework.jdbc.driver"; String JDBC_URL = "smart.framework.jdbc.url"; String JDBC_USERNAME = "smart.framework.jdbc.username"; String JDBC_PASSWORD = "smart.framework.jdbc.password"; String APP_BASE_PACKAGE = "smart.framework.app.base_package"; String APP_JSP_PATH = "smart.framework.app.jsp_path"; String APP_ASSET_PATH = "smart.framework.app.asset_path"; }
/** * 属性文件助手类 * * @author solverpeng * @create 2016-06-23-14:37 */ public final class ConfigHelper { private static final Properties CONFIGE_PROPS = PropsUtils.loadProps(ConfigConstant.CONFIG_FILE); /** * 获取 JDBC 驱动 */ public static String getJdbcDriver() { return PropsUtils.getString(CONFIGE_PROPS, ConfigConstant.JDBC_DRIVER); } /** * 获取 JDBC URL */ public static String getJdbcUrl() { return PropsUtils.getString(CONFIGE_PROPS, ConfigConstant.JDBC_URL); } /** * 获取 JDBC 用户名 */ public static String getJdbcUsername() { return PropsUtils.getString(CONFIGE_PROPS, ConfigConstant.JDBC_USERNAME); } /** * 获取 JDBC 密码 */ public static String getJdbcPassword() { return PropsUtils.getString(CONFIGE_PROPS, ConfigConstant.JDBC_PASSWORD); } /** * 获取应用基础包名 */ public static String getAppBasePackage() { return PropsUtils.getString(CONFIGE_PROPS, ConfigConstant.APP_BASE_PACKAGE); } /** * 获取应用 JSP 路径 */ public static String getAppJspPath() { return PropsUtils.getString(CONFIGE_PROPS, ConfigConstant.APP_JSP_PATH, "/WEB-INF/view/"); } /** * 获取应用静态资源路径 */ public static String getAppAssetPath() { return PropsUtils.getString(CONFIGE_PROPS, ConfigConstant.APP_ASSET_PATH, "/asset/"); } }
