浅谈java运用注解实现对类中的方法检测的工具

时间:2022-03-11 21:38:59

创建自定义注解

java" id="highlighter_565572">
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@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface Test {
 
}

建立测试

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public class UserTest {
    
    @Test
    public void testInsert() {
        User user = null;
        System.out.println(user.getUsername());
    }
    
    @Test
    public void testQuery() {
        Blog b = new Blog();
        b.setTips(new String[] {"技术","java","多线程"});
        String[] tips = b.getTips();
        System.out.println(tips[3]);
    }
    
    @Test
    public void divide() {
        System.out.println(10/0);
    }
    
 
}

编写工具类

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public static void main(String[] args) {
        BufferedWriter bw = null;
        try {
            //记录方法总数
            int methodCount = 0;
            //记录错误方法总数
            int expCount = 0;
            //准备一个文件输出流,用于记录程序执行过程中的异常信息
            bw = new BufferedWriter(new FileWriter("log.txt"));
            // 获取类的Class对象
            Class clz = UserTest.class;
            //创建目标类型的实例对象
            Object obj = clz.newInstance();
            //获取所有的方法对象
            Method[] methods = clz.getMethods();
            for (Method m : methods) {
                if(m.isAnnotationPresent(Test.class)) {
                    //统计总共有多少方法需要被测试
                    methodCount++;
                }
            }
            bw.write("测试方法总数:" + methodCount);
            bw.newLine();
            bw.write("================================");
            bw.newLine();
            for (Method m : methods) {
                try {
                    //如果方法上面包含了Test注解则作为测试方法进行测试
                    if(m.isAnnotationPresent(Test.class)) {
                        m.invoke(obj);
                    }
                } catch (Exception e) {
                    //异常方法计数器递增
                    expCount++;
                    bw.write(m.getName() + "出现异常");
                    bw.newLine();
                    bw.write("类型:" + e.getCause().getClass());
                    bw.newLine();
                    bw.write("原因:" + e.getCause().getMessage());
                    bw.newLine();
                    bw.write("================================");
                    bw.newLine();
                }
            }
            bw.write("错误方法总数:" + expCount);
            bw.newLine();
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                if(bw != null) {
                    bw.flush();
                    bw.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

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原文链接:https://blog.csdn.net/LL_19980115/article/details/107744666