Java如何获取方法参数的参数名称
package com.mikan;
import java.lang.annotation.*;
/**
* @author Mikan
* @date 2015-08-04 23:39
*/
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Param {
String value();
}
获取注解中的参数名的工具类：
package com.mikan;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
/**
* @author Mikan
* @date 2015-08-05 00:26
*/
public class ParameterNameUtils {
/**
* 获取指定方法的参数名
*
* @param method 要获取参数名的方法
* @return 按参数顺序排列的参数名列表
*/
public static String[] getMethodParameterNamesByAnnotation(Method method) {
Annotation[][] parameterAnnotations = method.getParameterAnnotations();
if (parameterAnnotations == null || parameterAnnotations.length == 0) {
return null;
}
String[] parameterNames = new String[parameterAnnotations.length];
int i = 0;
for (Annotation[] parameterAnnotation : parameterAnnotations) {
for (Annotation annotation : parameterAnnotation) {
if (annotation instanceof Param) {
Param param = (Param) annotation;
parameterNames[i++] = param.value();
}
}
}
return parameterNames;
}
}
测试类：
package com.mikan;
import java.lang.reflect.Method;
import java.util.Arrays;
/**
* @author Mikan
* @date 2015-08-04 23:40
*/
public class ParameterNameTest {
public void method1(@Param("parameter1") String param1, @Param("parameter2") String param2) {
System.out.println(param1 + param2);
}
public static void main(String[] args) throws Exception {
Class<ParameterNameTest> clazz = ParameterNameTest.class;
Method method = clazz.getDeclaredMethod("method1", String.class, String.class);
String[] parameterNames = ParameterNameUtils.getMethodParameterNamesByAnnotation(method);
System.out.println(Arrays.toString(parameterNames));
}
}
