java中类的加载Demo

最新推荐文章于 2022-05-14 16:00:35 发布

最新推荐文章于 2022-05-14 16:00:35 发布 · 262 阅读

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本文介绍了一个使用Java反射机制调用接口实现类方法的例子。通过ClassUtil工具类，动态加载并实例化指定类，然后调用其run方法，最终输出结果。此方法适用于配置灵活的应用场景。

package com.cash.utils;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import com.cash.server.ICommonService;


public class ClassUtil {
    public static  String exec(String classString, Object[] objects) {
        Class<?> convertorClass;
        String result = null;
        if (null == classString || "".equalsIgnoreCase(classString)) {
            return null;
        }
        try {
            convertorClass = Class.forName(classString);
            ICommonService convertor = (ICommonService) convertorClass
                    .newInstance();
            Method istance = convertorClass.getMethod("run",
                    java.lang.String.class,java.lang.String.class,java.lang.String.class);
            result = (String) istance.invoke(convertor, objects);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        }
        return result;
    }
}

package com.cash.server;

public interface ICommonService {
    
    public String run(String para1, String para2, String para3);
    
}

package com.cash.server;

public class AService implements ICommonService {

    @Override
    public String run(String para1, String para2, String para3) {
        
        return para1 + ":" + para2 + ":" + para3;
    }

}

package com.cash.server;

import com.cash.utils.ClassUtil;

public class Main {
    
    public static void main(String[] args) {
        Object[] objects = {"I Am "," The " , " Best"};
        String result = ClassUtil.exec("com.cash.server.AService", objects);
        System.out.println(result);
    }

}