有关Java中的BeanInfo介绍

public class PersonBean implements java.io.Serializable {

    
    private String name = null;

    private boolean deceased = false;

    
    public PersonBean() {
    }

    
    public String getName() {
        return name;
    }

    
    public void setName(final String value) {
        name = value;
    }

    
    public boolean isDeceased() {
        return deceased;
    }

    
    public void setDeceased(final boolean value) {
        deceased = value;
    }
}

{
 "username":"xxx",
 "passWord":"xxxx"
}

public void login(@RequestBody LoginRequest request){
     // Do login
}

public class LoginRequest {
    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;
    }

    private String username;
    private String password;
}

// 在Object类时候停止检索，可以选择在任意一个父类停止
BeanInfo beanInfo = Introspector.getBeanInfo(JavaBeanDemo.class,Object.class);

public class BeanUtilsPerfORManceTest {

    public static void main(String[] args){
        // 预热虚拟机
        loopBeanUtils(100000);
        loopCopyByHand(100000);

        // 复制1万次的情况
        System.out.println("\nloop 10000 times:");
        loopBeanUtils(10000);
        loopCopyByHand(10000);

        // 复制1百万次的情况
        System.out.println("\nloop 1000000 times:");
        loopBeanUtils(1000000);
        loopCopyByHand(1000000);

        // 复制1亿次的情况
        System.out.println("\nloop 100000000 times:");
        loopBeanUtils(100000000);
        loopCopyByHand(100000000);
    }

    private static void loopBeanUtils(int loopTimes){
        TestBeanDemo source = new TestBeanDemo();
        TestBeanDemo target = new TestBeanDemo();
        long start = System.currentTimeMillis();
        for (int i=0;i<loopTimes;i++){
            BeanUtils.copyProperties(source,target);
        }
        System.out.println("BeanUtils cost times:"+String.valueOf(System.currentTimeMillis()-start));
    }

    private static void loopCopyByHand(int loopTimes){
        TestBeanDemo source = new TestBeanDemo();
        TestBeanDemo target = new TestBeanDemo();
        long start = System.currentTimeMillis();
        for (int i=0;i<loopTimes;i++){
            target.setField1(source.getField1());
            target.setField2(source.getField2());
            target.setField3(source.getField3());
            target.setField4(source.getField4());
            target.setField5(source.getField5());
        }
        System.out.println("Copy field one by one times:"+String.valueOf(System.currentTimeMillis()-start));
    }

    @Data
    private static class TestBeanDemo{
        private String field1 = UUID.randomUUID().toString();
        private String field2 = UUID.randomUUID().toString();
        private String field3 = UUID.randomUUID().toString();
        private String field4 = UUID.randomUUID().toString();
        private String field5 = UUID.randomUUID().toString();

    }
}