如何使用java反射机制测试私有方法

来源：互联网发布：怎样开淘宝网店教程编辑：程序博客网时间：2024/05/16 12:19

今天在项目中添加了一个私有方法，需要添加测试用例，学习了下用java反射机制测试私有方法，分享如下：

-首先私有方法如下（所在类为YoukuUploaderImpl）：

private String checkUrl(String creativeUrl,CreativeAuditInfoView caiv){        if (null == caiv) {            log.error("creativeAuditInfoView is null.");            return null;        }        if (null == targetService) {            targetService = (TargetService) DspApplicationContextUtil.getContext().getBean("targetService");        }        List<FlightTraffic> trafficList = null;        try {            trafficList = targetService.getAllTrafficByFlight(caiv.getFlightID());        } catch (TargetException e) {            log.error("YoukuUploaderImpl.checkUrl.trafficList", e);            return null;        }        if (null != trafficList) {            for (FlightTraffic traffic : trafficList) {                if(traffic.getType().intValue() != 2){                    return creativeUrl;                }else{                    break;                }            }        }        String[] spUrlPoint = creativeUrl.split("\\.");        String endUrlPoint = spUrlPoint[spUrlPoint.length - 1];        if(endUrlPoint!=null && endUrlPoint.toLowerCase().equals("html")){            return creativeUrl;        }        String[] spUrlMark = creativeUrl.split("\\?");        if(spUrlMark.length==2){            return spUrlMark[0]+".html";        }        return null;    }

测试类中是这样写的:

public String CheckUrlByReflect(String str)throws SecurityException, NoSuchMethodException, IllegalArgumentException,             IllegalAccessException, InvocationTargetException{        YoukuUploaderImpl youkuUploaderImpl = new YoukuUploaderImpl();        youkuUploaderImpl.setTargetService(targetService);        Class<YoukuUploaderImpl> clazz=YoukuUploaderImpl.class;        Method method=clazz.getDeclaredMethod("checkUrl",new Class[]{String.class,CreativeAuditInfoView.class});        method.setAccessible(true);        Object object = method.invoke(youkuUploaderImpl, new Object[]{str,build(1,1)});         String json = object==null ? "" : object.toString();        log.info("json:"+json);        return json;    }

可以看出，利用反射机制调用私有方法时，首先需要new一个方法所在类的实例，还要获取这个类的字节码文件，然后用字节码文件获取相应的方法，并且要将方法设为可执行。
同时注意到反射机制调用方法的返回值是一个对象。

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