Question

我第一次使用JSP，Servlets，Tomcat服务器，MySQL和Netbeans创建一个简单的网站（如果有帮助的话）。

感谢JPA EntityManager ，我可以将数据插入我的数据库，如下所示：

    EntityManager entityManager = Persistence.createEntityManagerFactory("test").createEntityManager();
    entityManager.getTransaction().begin();
    entityManager.persist(usr);
    entityManager.getTransaction().commit();

其中usr是由Netbeans生成的实体类用户。一切都很完美，除了它不支持重音等字符。

假设我想插入“cliché”这个词：

如果我尝试打印 User 类中的值，一切都很好。
当发送该值时，如果我尝试从我的基础中选择值，我会有奇怪的字符而不是“é”

数据库字段为 utf8_unicode_ci 。如果我尝试从MySQL提示符中进行简单的INSERT，例如

INSERT INTO table (name) VALUES("ééé");

它工作得很好。

正如我在某些网站上所读到的，我使用以下行修改了 persistence.xml ：

<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=UTF-8&amp;characterSetResults=UTF-8&amp;zeroDateTimeBehavior=convertToNull"/>

但结果是一样的。

编辑：以下是用户类

的属性

@Entity
@Table(name = "users")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Users.findAll", query = "SELECT u FROM Users u"),
    @NamedQuery(name = "Users.findByIdUsers", query = "SELECT u FROM Users u WHERE u.idUsers = :idUsers"),
    @NamedQuery(name = "Users.findByUsername", query = "SELECT u FROM Users u WHERE u.username = :username"),
    @NamedQuery(name = "Users.findByPasswd", query = "SELECT u FROM Users u WHERE u.passwd = :passwd"),
    @NamedQuery(name = "Users.findByFirstName", query = "SELECT u FROM Users u WHERE u.firstName = :firstName"),
    @NamedQuery(name = "Users.findByLastName", query = "SELECT u FROM Users u WHERE u.lastName = :lastName"),
    @NamedQuery(name = "Users.findByEmail", query = "SELECT u FROM Users u WHERE u.email = :email"),
    @NamedQuery(name = "Users.findByEmailAndPwd", query = "SELECT u FROM Users u WHERE u.email = :email AND u.passwd = :passwd")})
public class Users implements Serializable {
    @Basic(optional = false)
    @Column(name = "address")
    private String address;
    @Basic(optional = false)
    @Column(name = "city")
    private String city;
    @Basic(optional = false)
    @Column(name = "postal")
    private String postal;
    @Basic(optional = false)
    @Column(name = "phone")
    private String phone;
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "idUsers")
    private Integer idUsers;
    @Basic(optional = false)
    @Column(name = "username")
    private String username;
    @Basic(optional = false)
    @Column(name = "passwd")
    private String passwd;
    @Basic(optional = false)
    @Column(name = "firstName")
    private String firstName;
    @Basic(optional = false)
    @Column(name = "lastName")
    private String lastName;
    @Basic(optional = false)
    @Column(name = "email")
    private String email;

当我在网上看到时，我还尝试通过添加以下行来修改我的 catalina.bat ，但它没有改变任何内容。

设置JAVA_OPTS =％JAVA_OPTS％-Djavax.servlet.request.encoding = UTF-8 -Dfile.encoding = UTF-8

非常感谢任何帮助。

Answer 1

尝试在persistence.xml中添加此配置

<property name="hibernate.connection.characterEncoding">utf8</property>
<property name="hibernate.connection.useUnicode">true</property>
<property name="hibernate.connection.charSet">UTF-8</property>

Answer 2

您可以将unicode编码过滤器添加到web.xml：

  <filter>
    <filter-name>CharsetFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
      <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
      </init-param>
      <init-param>
       <param-name>forceEncoding</param-name>
       <param-value>true</param-value>
     </init-param>
  </filter>

如果你使用Spring，你可以使用'org.springframework.web.filter.CharacterEncodingFilter'类对所有请求进行编码，否则你应该使用其他编码类。

Answer 3

由于VGR的答案，我能够解决我的问题：HttpServletRequest UTF-8 Encoding

非常感谢你的帮助。

JPA EntityManager和字符编码

3 个答案: