使用java的注解(用在java类的方法上的注解)方法
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2023-12-21 08:52:16
场景:根据方法上的注解,通过java反射方式找到需要执行的的方法。
1.注解类
/**注解作用在方法上*/
@target({elementtype.me...
场景:根据方法上的注解,通过java反射方式找到需要执行的的方法。
1.注解类
/**注解作用在方法上*/ @target({elementtype.method}) /**注解的生命周期一直程序运行时都存在vm运行期间保留注解,可以通过反射机制读取注解信息*/ @retention(retentionpolicy.runtime) /**注解包含在javadoc中*/ @documented public @interface item { string value(); }
2.在类的方法上使用注解
public class workservice { private static logger logger = loggerfactory.getlogger(workservice.class); @item("1001") public int getitem1001info(girlvo girl) { logger.info("getitem1001info输出:"); logger.info(girl.tostring()); return 1; } @item("1002") public int getitem1002info(girlvo girl) { logger.info("getitem1002info输出:"); logger.info(girl.tostring()); return 1; } @item("1003") public int getitem1003info(girlvo girl) { logger.info("getitem1003info输出:"); logger.info(girl.tostring()); return 1; } @item("1004") public int getitem1004info(girlvo girl) { logger.info("getitem1004info输出:"); logger.info(girl.tostring()); return 1; } @item("1005") public int getitem1005info(girlvo girl) { logger.info("getitem1005info输出:"); logger.info(girl.tostring()); return 1; } @item("1006") public int getitem1006info(girlvo girl) { logger.info("getitem1006info输出:"); logger.info(girl.tostring()); return 1; } }
3.实体类,作为参数传递
public class girlvo implements serializable { private static final long serialversionuid = -8545755852948661858l; /**id号*/ private string girlid; /**姓名*/ private string girlname; /**年龄*/ private long age; /**身高*/ private double height; /**罩杯*/ private string cupsize; public string getgirlid() { return girlid; } public void setgirlid(string girlid) { this.girlid = girlid; } public string getgirlname() { return girlname; } public void setgirlname(string girlname) { this.girlname = girlname; } public long getage() { return age; } public void setage(long age) { this.age = age; } public double getheight() { return height; } public void setheight(double height) { this.height = height; } public string getcupsize() { return cupsize; } public void setcupsize(string cupsize) { this.cupsize = cupsize; } @override public string tostring() { return "girlvo [girlid=" + girlid +",girlname=" + girlname +",age=" + age +",height=" + height +",cupsize=" + cupsize +"]"; } }
4.反射调用方法注解的类
list<method> methods = methodutils.getmethodslistwithannotation(clazz,item.class); for (method method : methods) { for (annotation annotation : method.getdeclaredannotations()) { if (annotation instanceof item){ string code = ((item) annotation).value(); if (objects.equals(item, code)){ try { logger.info("注解号:" + code +" 执行开始..."); method.invoke(clazz.newinstance(), girlvo); logger.info("注解号:" + code +" 执行结束..."); } catch (exception e) { e.printstacktrace(); logger.info("抛异常..."); } } } } } } }
5.main方法测试类
public class testannotation { private static logger logger = loggerfactory.getlogger(testannotation.class); public static void main(string []args) throws classnotfoundexception{ logger.info("测试开始......"); hashmap<string,object> map = (hashmap<string,object>) getdata(); /**遍历hashmap*/ for(entry<string,object> entry : map.entryset()){ string item = entry.getkey(); girlvo girlvo = (girlvo) entry.getvalue(); reflectcallmethodannotation.annotationmethod(item,girlvo); } logger.info("测试结束......"); } public static map getdata() { hashmap<string ,object> data = new hashmap(); girlvo girlvo1 = new girlvo(); girlvo1.setgirlid("1001"); girlvo1.setgirlname("张一"); girlvo1.setage(27); girlvo1.setheight(169); girlvo1.setcupsize("f"); girlvo girlvo2 = new girlvo(); girlvo2.setgirlid("1002"); girlvo2.setgirlname("王二"); girlvo2.setage(29); girlvo2.setheight(175); girlvo2.setcupsize("b"); girlvo girlvo3 = new girlvo(); girlvo3.setgirlid("1003"); girlvo3.setgirlname("刘五"); girlvo3.setage(24); girlvo3.setheight(160); girlvo3.setcupsize("b"); girlvo girlvo4 = new girlvo(); girlvo4.setgirlid("1004"); girlvo4.setgirlname("陈六"); girlvo4.setage(21); girlvo4.setheight(168); girlvo4.setcupsize("c"); girlvo girlvo5 = new girlvo(); girlvo5.setgirlid("1005"); girlvo5.setgirlname("赵七"); girlvo5.setage(25); girlvo5.setheight(169); girlvo5.setcupsize("c"); girlvo girlvo6 = new girlvo(); girlvo6.setgirlid("1006"); girlvo6.setgirlname("张八"); girlvo6.setage(26); girlvo6.setheight(165); girlvo6.setcupsize("a"); data.put("1001", girlvo1); data.put("1002", girlvo2); data.put("1003", girlvo3); data.put("1004", girlvo4); data.put("1005", girlvo5); data.put("1006", girlvo6); return data; } }
以上所述是小编给大家介绍的使用java的注解(用在java类的方法上的注解)方法详解整合,希望对大家有所帮助