小编Joã*_*mas的帖子

我正在尝试从PDF文件插入和读取qrcode.要从图像中创建/读取qr代码我正在使用zxing项目并操纵pdf我正在使用Big Faceless PDF.

如果我创建QR码,插入我的pdf,然后从pdf读取图像并将正确的一个转换为QR码,一切都很好.但是,如果我试图从扫描的文档中读取图像(附带qr代码贴纸),我无法从pdf获取qr代码图像(我可以使用Big Faceless PDF获取的唯一图像是文档它自己).

有谁知道一个Java库在pdf文件中搜索qr代码？

谢谢你的帮助

我正在尝试使用多租户选项和自动模式创建配置Hibernate SessionFactory,但是我坚持这个错误:

java.lang.NullPointerException
    at org.hibernate.tool.hbm2ddl.SuppliedConnectionProviderConnectionHelper.prepare(SuppliedConnectionProviderConnectionHelper.java:51)
    at org.hibernate.tool.hbm2ddl.DatabaseExporter.<init>(DatabaseExporter.java:52)
    at org.hibernate.tool.hbm2ddl.SchemaExport.execute(SchemaExport.java:367)
    at org.hibernate.tool.hbm2ddl.SchemaExport.create(SchemaExport.java:304)
    at org.hibernate.tool.hbm2ddl.SchemaExport.create(SchemaExport.java:293)
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:498)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1742)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1780)
    at org.springframework.orm.hibernate4.LocalSessionFactoryBuilder.buildSessionFactory(LocalSessionFactoryBuilder.java:242)

这是我的弹簧配置:

 <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource1"/>
    <property name="hibernateProperties">
        <props>
         <prop key="hibernate.dialect">org.hibernate.dialect.HSQLDialect</prop>
         <prop key="hibernate.hbm2ddl.auto">create-drop</prop>
         <prop key="hibernate.show_sql">true</prop>
         <prop key="hibernate.cache.provider_class">org.hibernate.cache.HashtableCacheProvider</prop>

         <prop key="hibernate.multiTenancy">DATABASE</prop>
         <prop key="hibernate.multi_tenant_connection_provider">org.springframework.webflow.samples.booking.SampleMultiTenantConnectionProvider</prop>
         <prop key="hibernate.tenant_identifier_resolver">org.springframework.webflow.samples.booking.SampleCurrentTenantIdentifierResolver</prop>
      </props>
    </property>
</bean>


<!-- Deploys a in-memory "booking" datasource populated -->
<bean id="dataSource1" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="org.hsqldb.jdbcDriver" />
    <property name="url" value="jdbc:hsqldb:mem:booking1" />
    <property name="username" value="sa" />
    <property name="password" value="" />
</bean>

<bean id="dataSource2" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property …