让Spring自动加载Hibernate 注解类

 让Spring自动加载Hibernate 注解类

通常，spring整合Hibernate的SessionFactory是这样做的:

XML代码

<property name="annotatedClasses"> <LIST></LIST><VALUE></VALUE>com.systop.common.core.dao.testmodel.TestDept </property> <property name="mappingLocations"> <LIST></LIST><VALUE></VALUE>classpath*:org/jbpm/**/*.hbm.xml </property>

Spring可以根据mappingLocations属性中定义的Path Pattern自动加载hbm文件，但是对于annotatedClasses则只能一个一个的苦恼的写上去。无论是Hibernate还是Spring，都不能自动的加载某个package下的Anntated Classes。这样，一旦项目需要重构或者增加/减少Tables就会带来一些麻烦。尤其是对于那些已经打包的应用来说更是如此。

能不能让Spring自动加载AnnotatedClasses呢，我想到了Spring2.5中component-scan，于是便照猫画虎的写了一个AnnotationSessionFactoryBean的子类:

Java代码

package com.systop.common.core.dao.hibernate; import java.io.IOException; import java.util.HashSet; import java.util.Set; import javax.persistence.Entity; import org.apache.oro.text.regex.MalformedPatternException; import org.apache.oro.text.regex.Pattern; import org.apache.oro.text.regex.PatternCompiler; import org.apache.oro.text.regex.PatternMatcher; import org.apache.oro.text.regex.Perl5Compiler; import org.apache.oro.text.regex.Perl5Matcher; import org.hibernate.HibernateException; import org.hibernate.cfg.AnnotationConfiguration; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.core.io.Resource; import org.springframework.core.io.support.PathMatchingResourcePatternResolver; import org.springframework.core.io.support.ResourcePatternResolver; import org.springframework.core.type.classreading.CachingMetadataReaderFactory; import org.springframework.core.type.classreading.MetadataReader; import org.springframework.core.type.classreading.MetadataReaderFactory; import org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean; import org.springframework.util.ClassUtils; import org.springframework.util.CollectionUtils; import com.systop.common.core.exception.ApplicationException; @SuppressWarnings("unchecked") public class AnnotationSessionFactoryBeanEx extends AnnotationSessionFactoryBean { private static final Logger logger = LoggerFactory .getLogger(AnnotationSessionFactoryBeanEx.class); /** * The locations of the hibernate enity class files. They are often some of the string with * Sping-style resource. A ".class" subfix can make the scaning more precise. * <P>example: *</P><PRE> * classpath*:com/systop/** /model/*.class * </PRE> */ private String[] annotatedClassesLocations; /** * Which classes are not included in the session. * They are some of the regular expression. */ private String[] excludedClassesRegexPatterns; /** * @param annotatedClassesLocations the annotatedClassesLocations to set */ public void setAnnotatedClassesLocations(String[] annotatedClassesLocations) { this.annotatedClassesLocations = annotatedClassesLocations; } /** * @see AnnotationSessionFactoryBean#postProcessAnnotationConfiguration(org.hibernate.cfg.AnnotationConfiguration) */ @Override protected void postProcessAnnotationConfiguration(AnnotationConfiguration config) throws HibernateException { Set<CLASS></CLASS> annClasses = scanAnnotatedClasses(); //Scan enity classes. // Add entity classes to the configuration. if (!CollectionUtils.isEmpty(annClasses)) { for (Class annClass : annClasses) { config.addAnnotatedClass(annClass); } } } /** * Scan annotated hibernate classes in the locations. * @return Set of the annotated classes, if no matched class, return empty Set. */ private Set<CLASS></CLASS> scanAnnotatedClasses() { ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver(); MetadataReaderFactory metadataReaderFactory = new CachingMetadataReaderFactory( resourcePatternResolver); Set<CLASS></CLASS> annotatedClasses = new HashSet<CLASS></CLASS>(); if (annotatedClassesLocations != null) { try { for (String annClassesLocation : annotatedClassesLocations) { //Resolve the resources Resource[] resources = resourcePatternResolver.getResources(annClassesLocation); for (Resource resource : resources) { MetadataReader metadataReader = metadataReaderFactory.getMetadataReader(resource); String className = metadataReader.getClassMetadata().getClassName(); //If the class is hibernate enity class, and it does not match the excluded class patterns. if (isEntityClass(metadataReader) && !isExcludedClass(className)) { Class clazz = ClassUtils.forName(className); annotatedClasses.add(clazz); logger.debug("A entity class has been found. /n({})", clazz.getName()); } } } } catch (IOException e) { logger.error("I/O failure during classpath scanning, ({})", e.getMessage()); e.printStackTrace(); throw new ApplicationException(e); } catch (ClassNotFoundException e) { logger.error("Class not found, ({})", e.getMessage()); e.printStackTrace(); throw new ApplicationException(e); } catch (LinkageError e) { logger.error("LinkageError ({})", e.getMessage()); e.printStackTrace(); throw new ApplicationException(e); } } return annotatedClasses; } /** * @return True if the given MetadataReader shows * that the class is annotated by <CODE>javax.persistence.Enity</CODE> */ private boolean isEntityClass(MetadataReader metadataReader) { Set<STRING></STRING> annTypes = metadataReader.getAnnotationMetadata().getAnnotationTypes(); if (CollectionUtils.isEmpty(annTypes)) { return false; } return annTypes.contains(Entity.class.getName()); } /** * * @return True if the given class name match the excluded class patterns. */ private boolean isExcludedClass(String className) { if (excludedClassesRegexPatterns == null) { // All class is included. return false; } PatternCompiler compiler = new Perl5Compiler(); PatternMatcher matcher = new Perl5Matcher(); try { for (String regex : excludedClassesRegexPatterns) { //Test each patterns. logger.debug("Pattern is: {}", regex); Pattern pattern = compiler.compile(regex); if (matcher.matches(className, pattern)) { logger.debug("class [{}], matches [{}], so it is excluded.", className, pattern .getPattern()); return true; } } } catch (MalformedPatternException e) { logger.warn("Malformed pattern [{}]", e.getMessage()); } return false; } /** * @param exculdePatterns the exculdePatterns to set */ public void setExcludedClassesRegexPatterns(String[] excludedClassesRegexPatterns) { this.excludedClassesRegexPatterns = excludedClassesRegexPatterns; } }

在Spring的配置文件中这样写：

XML代码

<BEAN class=com.systop.common.core.dao.hibernate.AnnotationSessionFactoryBeanEx id=sessionFactory></BEAN> <property name="dataSource" ref="dataSource"></property> <property name="annotatedClassesLocations"> <LIST></LIST> <VALUE></VALUE>classpath*:com/systop/**/model/*.class </property> <!--用正则表达式匹配不被scan的类--> <property name="excludedClassesRegexPatterns"> <LIST></LIST> <VALUE></VALUE> </property>

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