java annotation
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転載元:http://blog.csdn.net/lifetragedy/article/details/7394910#comments
この例は分かりました。
この例は分かりました。
package com.shadow.test.annotation;
import com.shadow.test.annotation.ValueBind.fieldType;
public class Student {
private String name = "";
private int age = 0;
private String studentId = "";
@ValueBind(type = fieldType.STRING, value ="shadow")
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
@ValueBind(type = fieldType.INT, value ="30")
public void setAge(int age) {
this.age = age;
}
public String getStudentId() {
return studentId;
}
@ValueBind(type = fieldType.STRING, value ="3051608")
public void setStudentId(String studentId) {
this.studentId = studentId;
}
public String getName() {
return name;
}
}
package com.shadow.test.annotation;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ValueBind {
/**
*
* @author shadow
*
*/
enum fieldType{STRING,INT};
fieldType type();
String value();
}
package com.shadow.test.annotation;
import java.lang.reflect.Method;
/**
*
*
* @author shadow
*
*/
public class PersistObj {
public static void main(String[] args) {
try {
Object c = Class.forName("com.shadow.test.annotation.Student")
.newInstance();
Method[] methodArray = c.getClass().getDeclaredMethods();
for (int i = 0; i < methodArray.length; i++) {
if (methodArray[i].isAnnotationPresent(ValueBind.class)) {
ValueBind annotation = methodArray[i]
.getAnnotation(ValueBind.class);
String type = String.valueOf(annotation.type());
String value = annotation.value();
if (type.equals("INT")) {
methodArray[i].invoke(c, new Integer(value));
} else if (type.equals("STRING")) {
methodArray[i].invoke(c, value);
}
}
}
Student annotaedStudent = (Student) c;
System.out.println("studentId====" + annotaedStudent.getStudentId()
+ " studentnName====" + annotaedStudent.getName()
+ " student Age====" + annotaedStudent.getAge());
} catch (Exception e) {
e.printStackTrace();
}
}
}