实际上,我找到了可能的解决方案
//returns true
new BigDecimal("5.50").doubleValue() == new BigDecimal("5.5").doubleValue()
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当然,它可以通过类似的Math.abs (v1 - v2) < EPS方式进行改进,使比较更加健壮,但问题是这种技术是否可以接受或是否有更好的解决方案?
如果有人知道为什么java设计师决定以这种方式实现BigDecimal的平等,那么阅读它会很有趣.
我知道这是Laravel中形式之类的已知错误.但是我在Laravel 5.2中遇到了基本身份验证的问题.
我用Laravel创建了auth;
php artisan make:auth
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现在我在我的服务器和本地代码上都有相同的代码副本.在我当地,我没有任何问题.但是在我的服务器上,当我尝试注册用户时,我得到错误说TokenMismatchException in VerifyCsrfToken.php Line 67
我的本地和服务器环境都是同步的,但我在注册时一直收到错误.有关如何解决此问题的任何帮助?
我在SQL中编写了一个数据库生成脚本,并希望在我的Adobe AIR应用程序中执行它:
Create Table tRole (
roleID integer Primary Key
,roleName varchar(40)
);
Create Table tFile (
fileID integer Primary Key
,fileName varchar(50)
,fileDescription varchar(500)
,thumbnailID integer
,fileFormatID integer
,categoryID integer
,isFavorite boolean
,dateAdded date
,globalAccessCount integer
,lastAccessTime date
,downloadComplete boolean
,isNew boolean
,isSpotlight boolean
,duration varchar(30)
);
Create Table tCategory (
categoryID integer Primary Key
,categoryName varchar(50)
,parent_categoryID integer
);
...
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我使用以下方法在Adobe AIR中执行此操作:
public static function RunSqlFromFile(fileName:String):void {
var file:File = File.applicationDirectory.resolvePath(fileName);
var stream:FileStream = …Run Code Online (Sandbox Code Playgroud) 我有以下控制器方法:
@RequestMapping(value="/map/update", method=RequestMethod.POST, produces = "application/json; charset=utf-8")
@ResponseBody
public ResponseEntityWrapper updateMapTheme(
HttpServletRequest request,
@RequestBody @Valid List<CompanyTag> categories,
HttpServletResponse response
) throws ResourceNotFoundException, AuthorizationException {
...
}
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CompanyTag以这种方式定义:
public class CompanyTag {
@StringUUIDValidation String key;
String value;
String color;
String icon;
Icon iconObj;
public String getKey() {
return key;
}
public void setKey(String key) {
this.key = key;
}
...
}
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问题是未触发验证,未验证CompanyTag列表,从不调用"StringUUIDValidation"验证器.
如果我删除了List并且只尝试发送一个CompanyTag,即代替:
@RequestBody @Valid List<CompanyTag> categories,
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使用:
@RequestBody @Valid CompanyTag category,
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它按预期工作,所以显然Spring不喜欢验证事物列表(尝试使用数组,但也没有用).
任何人都知道缺少什么?
我需要在项目中上传图片.如何在SpringMVC中获取上传路径.路径是;
/home/cme/project/eclipse/workspace_12_11/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/fileUploadTester/upload
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以下错误;
The method getServletContext() is undefined for the type HomePageController
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我使用此代码时出现;
String uploadPath = getServletContext().getRealPath("") + File.separator + UPLOAD_DIRECTORY;
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我的代码是
public ModelAndView UploadPhoto(@ModelAttribute User user, HttpServletRequest request, HttpServletResponse response) throws IOException {
final String UPLOAD_DIRECTORY = "upload";
final int THRESHOLD_SIZE = 1024 * 1024 * 3; // 3MB
final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB
final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB
String value[] = new String[10];
int i = …Run Code Online (Sandbox Code Playgroud) 我想在开始生产和消费工作之前确保kafka服务器是否正在运行.它是在windows环境中,这是我的kafka服务器在eclipse中的代码...
Properties kafka = new Properties();
kafka.setProperty("broker.id", "1");
kafka.setProperty("port", "9092");
kafka.setProperty("log.dirs", "D://workspace//");
kafka.setProperty("zookeeper.connect", "localhost:2181");
Option<String> option = Option.empty();
KafkaConfig config = new KafkaConfig(kafka);
KafkaServer server = new KafkaServer(config, new CurrentTime(), option);
server.startup();
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在这种情况下if (server != null)是不够的,因为它总是如此.那么有没有办法知道我的kafka服务器正在运行并为生产者做好准备.我有必要检查一下,因为它会导致丢失一些起始数据包.
谢谢.
我有两节课.一个是实体类,另一个是复合键类.
代码如下.
@Entity
public class Supply {
@Embeddable
class Id implements Serializable {
@Column(name = "supplier_id")
private long supplierId;
@Column(name = "merchandise_id")
private long merchandiseId;
public Id() {
}
public Id(long sId, long mId) {
this.supplierId = sId;
this.merchandiseId = mId;
}
}
@EmbeddedId
private Id id = new Id();
}
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如果我用试试找
from Supply where merchandise_id=%d and supplier_id=%d
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Hibernate将抛出异常,即:
No default constructor for entity: com.entity.Supply$Id; nested exception is org.hibernate.InstantiationException: No default constructor for entity: com.entity.Supply$Id
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但是,我发现如果我将类 ID更改为静态 …
我正在使用spring-data的存储库 - 非常方便,但我遇到了一个问题.我可以轻松更新整个实体,但我相信当我只需要更新一个字段时,这是毫无意义的:
@Entity
@Table(schema = "processors", name = "ear_attachment")
public class EARAttachment {
private Long id;
private String originalName;
private String uniqueName;//yyyy-mm-dd-GUID-originalName
private long size;
private EARAttachmentStatus status;
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更新我只是调用方法保存.在日志中我看到了跟随:
batching 1 statements: 1: update processors.ear_attachment set message_id=100,
original_name='40022530424.dat',
size=506,
status=2,
unique_name='2014-12-16-8cf74a74-e7f3-40d8-a1fb-393c2a806847-40022530424.dat'
where id=1
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我想看到这样的事情:
batching 1 statements: 1: update processors.ear_attachment set status=2 where id=1
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Spring的存储库有很多工具可以使用名称约定来选择一些东西,也许像updateForStatus(int status)这样的更新有类似的东西;
我有;
public enum Detailed {
PASSED, INPROCESS, ERROR1, ERROR2, ERROR3;
}
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并需要将其转换为以下内容;
public enum Simple {
DONE, RUNNING, ERROR;
}
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所以首先PASSED- > DONE和INPROCESS- > RUNNING,但所有错误应该是:ERROR.显然,可以为所有值编写案例,但可能有更好的解决方案?
我正在研究Vaadin spring应用程序.我唯一能说的是,用户的身份验证/授权必须通过查询数据库来完成jdbcTemplate.如何解决这个问题?我正在使用Spring Boot 1.4.2.RELEASE.
Description:
The dependencies of some of the beans in the application context form a cycle:
???????
| jdbcAccountRepository defined in file [repositories\JdbcAccountRepository.class]
? ?
| securityConfiguration.WebSecurityConfig (field services.JdbcUserDetailsServicessecurity.SecurityConfiguration$WebSecurityConfig.userDetailsService)
? ?
| jdbcUserDetailsServices (field repositories.JdbcAccountRepository services.JdbcUserDetailsServices.repository)
???????
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原始代码如下所示:
AccountRepository:
public interface AccountRepository {
void createAccount(Account user) throws UsernameAlreadyInUseException;
Account findAccountByUsername(String username);
}
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JdbcAccountRepository:
@Repository
public class JdbcAccountRepository implements AccountRepository {
private final Logger LOGGER = LoggerFactory.getLogger(this.getClass());
private final JdbcTemplate jdbcTemplate;
private final PasswordEncoder passwordEncoder;
@Autowired …Run Code Online (Sandbox Code Playgroud) java ×8
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