简书链接:多参反射的调用封装
文章字数：111,阅读全文大约需要1分钟
做一个ReflectUtil.callMethod(method,arg)的万能调用需要解决基本类型问题，如果直接传递intvalue,会被变成了包装类型。所以这里进行了下样板代码处理。
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|
import java.lang.reflect.Method;
public class MainTest {
public static void call(int a){
System.out.println("call(int):"+a);
}
public static void call(Integer a){
System.out.println("call(integer):"+a);
}
public static void call(long a){
System.out.println("call(long):"+a);
}
public static void call(Long a){
System.out.println("call(Long):"+a);
}
public static Class<?>[] getParameterTypes(Object... args) {
Class<?>[] clazzes = new Class<?>[args.length];
for (int i = 0; i < args.length; i++) {
Object obj = args[i];
if(obj!=null){
if(obj instanceof PrimitiveValue){
PrimitiveValue baseTypeValue = (PrimitiveValue) obj;
clazzes[i]=baseTypeValue.type;
}else{
clazzes[i] = obj.getClass();
}
}
}
return clazzes;
}
public static Object[] getParameterValue(Object... args) {
for (int i = 0; i < args.length; i++) {
Object obj = args[i];
if(obj!=null){
if(obj instanceof PrimitiveValue){
PrimitiveValue baseTypeValue = (PrimitiveValue) obj;
args[i]=baseTypeValue.value;
}
}
}
return args;
}
public static class PrimitiveValue {
public Class type;
public Object value;
public PrimitiveValue(int value) {
this.value = value;
type=int.class;
}
public PrimitiveValue(long value) {
this.value = value;
type=long.class;
}
public PrimitiveValue(short value) {
this.value = value;
type=short.class;
}
public PrimitiveValue(byte value) {
this.value = value;
type=byte.class;
}
public PrimitiveValue(float value) {
this.value = value;
type=float.class;
}
public PrimitiveValue(double value) {
this.value = value;
type=double.class;
}
public PrimitiveValue(boolean value) {
this.value = value;
type=boolean.class;
}
}
public static void executeMethod(Object... test1){
Class<?>[] args = getParameterTypes(test1);
try {
//java.lang.NoSuchMethodException: MainTest.call(java.lang.Integer)
Method method = MainTest.class.getMethod("call", args);
method.invoke(null,getParameterValue(test1));
} catch (Throwable e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
//call1(Integer.valueOf(1));
executeMethod(new PrimitiveValue(1));
executeMethod(123);
executeMethod(new PrimitiveValue(1111l));// call(long)
executeMethod(111L);
}
}
|
输出结果
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| call(int):1
call(integer):123
call(long):1111
call(Long):111
|
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