BladeCode/blog: hexo 个人博客 @ 6bd2d6317efbc790be4583c477aa97b5f71ad9ed

title: aop date: 2018-12-03 15:38:33 tags: [Spring Boot,AOP]

categories: [Java,Spring]

spring aop

通过自定义注解和aop实现参数校验

配置

mvc 配置文件添加

<aop:aspectj-autoproxy proxy-target-class="true"/>

开启自动切面代理

添加自定义注解 ```java /**
- @author : wangzhiyong
- @date : 2018/11/12 17:41
- description : 参数校验自定义注解 */ @Retention(RetentionPolicy.RUNTIME) @Target({ElementType.FIELD, ElementType.PARAMETER, ElementType.TYPE}) @Documented @Inherited public @interface ParamCheck {
/**
- 是否必填 *
- @return */ public boolean require() default true;
/**
- 参数类型
- {@link com.ys.tools.paramcheck.ParamType} *
- @return */ public ParamType type() default ParamType.STRING;
/**
- 长度 *
- @return */ public int size() default Integer.MAX_VALUE;
/**
- 最小值 *
- @return */ public double min() default Integer.MIN_VALUE;
/**
- 最大值 *
- @return */ public double max() default Integer.MAX_VALUE;
/**
- 格式化 *
- @return */ public String pattern() default "yyyy-MM-dd HH:mm:ss";
/**
- 是否是加密字段 *
- @return */ public boolean cipher() default false;

}

- 添加指定类型
```java
public enum ParamType {
    /**
     * 基本参数类型
     */
    BYTE,SHORT,INT,LONG,FLOAT,DOUBLE,BOOLEAN,CHAR,
    /**
     * 拓展参数类型
     */
    STRING,DATE
}

添加处理逻辑 ```java @Aspect @Component public class ParamCheckAspect {

private static final Logger logger = Logger.getLogger(ParamCheckAspect.class);

@Pointcut("@args(com.dragon.chaofeng.annotation.ParamCheck, ..) && execution(* com.dragon.chaofeng.web...(..))") // @Pointcut("execution(* com.dragon.chaofeng.web...(..))") // @Pointcut("@args(org.springframework.web.bind.annotation.RequestBody, ..)") // @Pointcut("@within(com.dragon.chaofeng.annotation.ParamCheck)") // @Pointcut("execution (* com.dragon.chaofeng.service...(..))") // @Pointcut("@annotation(org.springframework.web.bind.annotation.RequestMapping)") public void paramPointcut() { }

@Before("paramPointcut()") public void before(JoinPoint joinPoint) {
```
Object[] args = joinPoint.getArgs();
if (args == null || args.length == 0) {
    return;
}
// 方法的参数
Class<?>[] parameterTypes = ((MethodSignature) joinPoint.getSignature()).getMethod().getParameterTypes();
for (int i = 0; i < parameterTypes.length; i++) {
    Class<?> parameterType = parameterTypes[i];
    // 若参数未注解ParamCheck, 忽略验证
    if (parameterType.getAnnotation(ParamCheck.class) == null) {
        continue;
    }
    // 传入的参数
    Object arg = args[i];
    if (arg == null) {
        throw new AtdsException("parameter should not be null or empty");
    }
    //获取所有变量
    List<Field> fieldList = new ArrayList<>();
    Class<?> argClass = arg.getClass();
    // 去重临时变量
    Set<String> temp = new HashSet<>();
    //当父类为null的时候说明到达了最上层的父类(Object类).
    while (argClass != null && !argClass.getName().toLowerCase().equals("java.lang.object")) {
        for (Field field : argClass.getDeclaredFields()) {
            if (!temp.contains(field.getName())) {
                fieldList.add(field);
                temp.add(field.getName());
            }
        }
        //得到父类,然后赋给自己
        argClass = argClass.getSuperclass();
    }
    // 获取注解
    for (Field field : fieldList) {
        // 获取注解
        ParamCheck annotationsByType = field.getAnnotation(ParamCheck.class);
        // 只检查@ParamCheck注解字段
        if (annotationsByType == null) {
            continue;
        }
        // 设置字段可访问并取值
        field.setAccessible(true);
        Object argValue = null;
        try {
            argValue = field.get(arg);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
            logger.error("ParamCheckAspect: " + e.getMessage());
        }
        // 字段类型
        Class type = field.getType();
        // 字段为null或空string
        if (argValue == null || (String.class.equals(type) && "".equals(argValue))) {
            // 若注解声明非空, 抛出异常, 否则忽略本字段
            if (annotationsByType.require()) {
                throw new AtdsException("parameter " + field.getName() + " should not be null or empty");
            } else {
                continue;
            }
        }
        // 字段类型非数字 且非String, 忽略本字段, 不深入检查
        if (!isNumberType(type) && !String.class.equals(type)) {
            continue;
        }
        try {
            // 字段类型为 String 或 数字, 走各自验证
            if (String.class.equals(type)) {
                checkString(String.valueOf(argValue), annotationsByType);
            } else {
                checkNumber(argValue, annotationsByType);
            }
        } catch (AtdsException e) {
            throw new AtdsException(String.format(e.getMessage(), field.getName()));
        }
    }
}
```
}

/**
- 是否数字类型 *
- @param type
- @return */ private boolean isNumberType(Class type) { return isNumberType(type.getSimpleName()); }
/**
- 是否数字类型 *
- @param typeName
- @return */ private boolean isNumberType(String typeName) { if ("integer".equalsIgnoreCase(typeName) || ParamType.INT.name().equalsIgnoreCase(typeName)) { return true; } else if ("long".equalsIgnoreCase(typeName) || ParamType.LONG.name().equalsIgnoreCase(typeName)) { return true; } else if ("double".equalsIgnoreCase(typeName) || ParamType.DOUBLE.name().equalsIgnoreCase(typeName)) { return true; } else if ("float".equalsIgnoreCase(typeName) || ParamType.FLOAT.name().equalsIgnoreCase(typeName)) { return true; } else if ("byte".equalsIgnoreCase(typeName) || ParamType.BYTE.name().equalsIgnoreCase(typeName)) { return true; } else if ("short".equalsIgnoreCase(typeName) || ParamType.SHORT.name().equalsIgnoreCase(typeName)) { return true; } else if ("character".equalsIgnoreCase(typeName) || ParamType.CHAR.name().equalsIgnoreCase(typeName)) { return true; } return false; }
/**
- 检查String类型的参数
- 包括 size/根据 type 检查 min/max/pattern *
- @param value
- @param paramCheck */ private void checkString(String value, ParamCheck paramCheck) throws AtdsException { // 检查长度 if (paramCheck.size() < value.length()) { throw new AtdsException("parameter %s is too long. (" + value.length() + " of " + paramCheck.size() + ")"); } // 日期时 if (ParamType.DATE.equals(paramCheck.type())) { DateTimeFormatter formatter = DateTimeFormatter.ofPattern(paramCheck.pattern()); try { formatter.parse(value); } catch (Exception e) { throw new AtdsException("parameter %s needs correct pattern. (" + paramCheck.pattern() + ")"); } } else if (ParamType.BOOLEAN.equals(paramCheck.type())) { if (!"true".equals(value) && !"false".equals(value)) { throw new AtdsException("parameter %s is not a " + paramCheck.type()); } } else if (isNumberType(paramCheck.type().name())) { checkNumber(value, paramCheck); }
}

/**
- 检查数字类型(BYTE/SHORT/INT/LONG/FLOAT/DOUBLE)以及字符类型的参数
- 包括 min/max *
- @param value
- @param paramCheck */ private void checkNumber(Object value, ParamCheck paramCheck) { BigDecimal numberValue; try { String stringValue = value.toString(); if (ParamType.CHAR.equals(paramCheck.type())) { if (stringValue.length() != 1) { throw new NumberFormatException(); } numberValue = new BigDecimal(stringValue.toCharArray()[0]); } else { numberValue = new BigDecimal(stringValue); } } catch (NumberFormatException e) { throw new AtdsException("parameter %s is not a " + paramCheck.type()); } // 检查最大值 BigDecimal min = new BigDecimal(paramCheck.min()); if (numberValue.compareTo(min) < 0) { throw new AtdsException("parameter %s is out of range. (min: " + paramCheck.min() + ")"); } // 检查最小值 BigDecimal max = new BigDecimal(paramCheck.max()); if (numberValue.compareTo(max) > 0) { throw new AtdsException("parameter %s is out of range. (max: " + paramCheck.max() + ")"); } }

} ```

aop.md 9.6 KB Geschiedenis Ruwe

categories: [Java,Spring]

spring aop

配置

aop.md 9.6 KB

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