实体类Bean:
public class User {
private String userName;
private String password;
private Integer count; public String getUserName() {return userName;} public void setUserName(String userName) {this.userName = userName;} public String getPassword() {return password;} public void setPassword(String password) {this.password = password;} public Integer getCount() {return count;} public void setCount(Integer count) {this.count = count;}
}
当我实例化一个User时候,通过反射user.getClass().getDeclaredFields();可以得到它的所有属性
问:如何得到这个实例user的所有值呢,因为UserBean是私有属性,无法通过反射的get方法得到
public class User {
private String userName;
private String password;
private Integer count; public String getUserName() {return userName;} public void setUserName(String userName) {this.userName = userName;} public String getPassword() {return password;} public void setPassword(String password) {this.password = password;} public Integer getCount() {return count;} public void setCount(Integer count) {this.count = count;}
}
当我实例化一个User时候,通过反射user.getClass().getDeclaredFields();可以得到它的所有属性
问:如何得到这个实例user的所有值呢,因为UserBean是私有属性,无法通过反射的get方法得到
import java.lang.reflect.Field;
import java.lang.reflect.Method;public class ReflectDemo { public static void main(String[] args) throws Exception { PrivateTest t = new PrivateTest();
Field field = Class.forName("com.test.PrivateTest").getDeclaredField(
"str");
// 不让Java语言检查访问修饰符
field.setAccessible(true);
field.set(t, "world");
t.getStr(); Method method2 = Class.forName("com.test.PrivateTest")
.getDeclaredMethod("method", new Class[] {});
method2.setAccessible(true);
method2.invoke(t, new Object[] {}); }
}class PrivateTest {
private String str = "hello"; public void getStr() {
System.out
.println("I'm str,I'm a private field,my old value is hello,now I am --->"
+ str);
} private void method() {
System.out.println("I'm in a private method!");
}
}--------------结果---------------------
I'm str,I'm a private field,my old value is hello,now I am --->world
I'm in a private method!
Field[] t = obj.getClass().getDeclaredFields();// 得到属性名部分
for (Field field : t) {
System.out.println(field);
field.get(obj);
}
}
这么说吧 比如说我new 一个User的实例,User u = new User();u.setPassword("1234");u.setUserName("f1");u.setCount(12);我传到上面的方法里面,在上面的addToken方法里面通过反射本来field.get(obj);是可以得到实例属性的值的,但是由于实体类属性私有,所以得不到了,就是需要各位大侠帮忙解决这个问题
public static void addToken(Object obj){
Field[] t = obj.getClass().getDeclaredFields();// 得到属性名部分
for (Field field : t) {
System.out.println(field);
field.setAccessible(true);
field.get(obj);
}
}办法2:
public static void addToken(Object obj){
Field[] t = obj.getClass().getDeclaredFields();// 得到属性名部分
for (Field field : t) {
System.out.println(field);
[color=#FF0000]
String methodname = "get" + field.getName.substring(0,1).toUpperCase() + field.getName.substring(1);
Object value = obj.getClass().getMethod(methodname).invoke(obj);
color]
}
}