springdata jpa使用Example快速实现动态查询功能

@Entity
@Table(name="t_user")
@Data
@AllArgsConstructor
@NoArgsConstructor
@ToString
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    @Column(name="username")
    private String username;
    @Column(name="password")
    private String password;
    @Column(name="email")
    private String email;
    @Column(name="phone")
    private String phone;
    @Column(name="address")
    private String address;
}

@Test
public void contextLoads() {
    User user = new User();
    user.setUsername("admin");
    Example<User> example = Example.of(user);
    List<User> list = userRepository.findAll(example);
    System.out.println(list);
}

Hibernate: 
    select
        user0_.id as id1_0_,
        user0_.address as address2_0_,
        user0_.email as email3_0_,
        user0_.password as password4_0_,
        user0_.phone as phone5_0_,
        user0_.username as username6_0_ 
    from
        t_user user0_ 
    where
        user0_.username=?

static <T> Example<T> of(T probe) {
    return new TypedExample(probe, ExampleMatcher.matching());
}
static ExampleMatcher matching() {
    return matchingAll();
}
static ExampleMatcher matchingAll() {
    return (new TypedExampleMatcher()).withMode(ExampleMatcher.MatchMode.ALL);
}

@Test
public void contextLoads() {
    User user = new User();
    user.setUsername("y");
    user.setAddress("sh");
    user.setPassword("admin");
    ExampleMatcher matcher = ExampleMatcher.matching()
            .withMatcher("username", ExampleMatcher.GenericPropertyMatchers.startsWith())//模糊查询匹配开头，即{username}%
            .withMatcher("address" ,ExampleMatcher.GenericPropertyMatchers.contains())//全部模糊查询，即%{address}%
            .withIgnorePaths("password");//忽略字段，即不管password是什么值都不加入查询条件
    Example<User> example = Example.of(user ,matcher);
    List<User> list = userRepository.findAll(example);
    System.out.println(list);
}

select
    user0_.id as id1_0_,
    user0_.address as address2_0_,
    user0_.email as email3_0_,
    user0_.password as password4_0_,
    user0_.phone as phone5_0_,
    user0_.username as username6_0_ 
from
    t_user user0_ 
where
    (
        user0_.username like ?
    ) 
    and (
        user0_.address like ?
    )

ExampleMatcher matcher = ExampleMatcher.matching()
  .withMatcher("firstname", match -> match.endsWith())
  .withMatcher("firstname", match -> match.startsWith());
}