當此注解打在類上，不需要傳參，該類下所有查詢接口開啟數據隔離；打在方法上默認開啟數據隔離，傳參為false則該方法關閉驗證

/** * 數據權限驗證注解 * @author xiaohua * @date 2021/6/23 */@Documented@Target({METHOD, ANNOTATION_TYPE, TYPE})@Retention(RUNTIME)public @interface DataPermission { /** * 是否要進行數據權限隔離 */ boolean isPermi() default true;}2. 具體實現

@Component@Intercepts({@Signature(type = StatementHandler.class, method = 'prepare', args = {Connection.class, Integer.class})})public class DataPermissionInterceptor implements Interceptor { private static final Logger logger = LoggerFactory.getLogger(DataPermissionInterceptor.class); @Autowired private TokenService tokenService; //掃描的包路徑（根據自己的項目路徑來），這里是取的配置里的包路徑 @Value('${permission.package-path}') private String packagePath; private final static String DEPT_ID = 'dept_id'; private final static String USER_ID = 'create_user'; private static List<String> classNames; @Override public Object intercept(Invocation invocation) throws Throwable {try { LoginInfo user = tokenService.getLoginInfo(); if (user == null){return invocation.proceed(); } List<Long> deptIds = (List<Long>) Convert.toList(user.getDataScope()); if (deptIds == null){deptIds = new ArrayList<>(); } //反射掃包會比較慢，這里做了個懶加載 if (classNames == null) {synchronized (LazyInit.class){ if (classNames == null){//掃描指定包路徑下所有包含指定注解的類Set<Class<?>> classSet = ClassUtil.scanPackageByAnnotation(packagePath, DataPermission.class);if (classSet == null && classSet.size() == 0){ classNames = new ArrayList<>();} else { //取得類全名 classNames = classSet.stream().map(Class::getName).collect(Collectors.toList());} }} } // 拿到mybatis的一些對象 StatementHandler statementHandler = PluginUtils.realTarget(invocation.getTarget()); MetaObject metaObject = SystemMetaObject.forObject(statementHandler); MappedStatement mappedStatement = (MappedStatement) metaObject.getValue('delegate.mappedStatement'); // mappedStatement.getId()為執行的mapper方法的全路徑名,newId為執行的mapper方法的類全名 String newId = mappedStatement.getId().substring(0, mappedStatement.getId().lastIndexOf('.')); // 如果不是指定的方法，直接結束攔截 if (!classNames.contains(newId)) {return invocation.proceed(); } String newName = mappedStatement.getId().substring(mappedStatement.getId().lastIndexOf('.') + 1, mappedStatement.getId().length()); //是否開啟數據權限 boolean isPermi = true; Class<?> clazz = Class.forName(newId); //遍歷方法 for (Method method : clazz.getDeclaredMethods()) {//方法是否含有DataPermission注解，如果含有注解則將數據結果過濾if (method.isAnnotationPresent(DataPermission.class) && newName.equals(method.getName())) { DataPermission dataPermission = method.getAnnotation(DataPermission.class); if (dataPermission != null) {//不驗證if (!dataPermission.isPermi()) { isPermi = false;} else { //開啟驗證 isPermi = true;} }} } if (isPermi){// 獲取到原始sql語句String sql = statementHandler.getBoundSql().getSql();// 解析并返回新的SQL語句，只處理查詢sqlif (mappedStatement.getSqlCommandType().toString().equals('SELECT')) { // String newSql = getNewSql(sql,deptIds,user.getUserId()); sql = getSql(sql,deptIds,user.getUserId());}// 修改sqlmetaObject.setValue('delegate.boundSql.sql', sql); } return invocation.proceed();} catch (Exception e){ logger.error('數據權限隔離異常：', e); return invocation.proceed();} } /** * 解析SQL語句，并返回新的SQL語句 * 注意，該方法使用了JSqlParser來操作SQL，該依賴包Mybatis-plus已經集成了。如果要單獨使用，請先自行導入依賴 * * @param sql 原SQL * @return 新SQL */ private String getSql(String sql,List<Long> deptIds,Long userId) {try { String condition = ''; String permissionSql = '('; if (deptIds.size() > 0){for (Long deptId : deptIds) { if ('('.equals(permissionSql)){permissionSql = permissionSql + deptId; } else {permissionSql = permissionSql + ',' + deptId; }}permissionSql = permissionSql + ')';// 修改原語句condition = DEPT_ID +' in ' + permissionSql; } else {condition = USER_ID +' = ' + userId; } if (StringUtils.isBlank(condition)){return sql; } Select select = (Select)CCJSqlParserUtil.parse(sql); PlainSelect plainSelect = (PlainSelect)select.getSelectBody(); //取得原SQL的where條件 final Expression expression = plainSelect.getWhere(); //增加新的where條件 final Expression envCondition = CCJSqlParserUtil.parseCondExpression(condition); if (expression == null) {plainSelect.setWhere(envCondition); } else {AndExpression andExpression = new AndExpression(expression, envCondition);plainSelect.setWhere(andExpression); } return plainSelect.toString();} catch (JSQLParserException e) { logger.error('解析原SQL并構建新SQL錯誤：' + e); return sql;} }

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