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Write the following test demo：
1、UserController.java：
@controller
public class UserController {
@Autowired
UserService userService;
@RequestMapping("gets")
@ResponseBody
public List<User> getUser(String ids) {
List<String> idList = Arrays.asList(ids.split(","));
return userService.gets(idList);
}
}
2、UserService.java：
@service
public interface UserService {
List<User> gets(Collection<String> ids);
}
3、UserServiceImpl.java：
@service
public class UserServiceImpl implements UserService {
@Autowired
UserMapper userMapper;
@Override
public List<User> gets(Collection<String> ids) {
if (ids == null || ids.isEmpty())
return new ArrayList<>();
String concatIds = StringUtils.concat(ids, "'", ",");
return (List<User>) userMapper.selectByIds(concatIds);
}
}
4、UserMapper.java：
@org.apache.ibatis.annotations.Mapper
public interface UserMapper extends Mapper, MySqlMapper, IdsMapper {
}
5、Access the /gets route in the above demo for sql injection attack：
（1）Under normal circumstances, when the ids parameter value is passed in 1, 2, the data with id 1 and 2 can be obtained：
（2）But when the ids parameter value is 1') or 1=1-- -, you can get all the data in the database：
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