最近做项目时，使用Hibernate Tools 3.2.4生成entity和hbm.xml，但默认情况下，DB中的comments没法生成到javadoc和xml中，改了templates倒是有注释了，但却是乱码，心里一直耿耿于怀…（这不符合咱一直强调的编码规范不是？最主要的是人懒，有时用entity不想再找文档）。在网上找了半天，大多说是freemarker编码设置问题，但不管怎么设置，都没一点效果，决定自己动手。下了源码，查到原因，人家压根就没处理中文问题。记录一下处理过程。

ftl是freemarker模板，可以通过在jar包外使用，java和properties重新打包替换hibernate-tools.jar，如果是eclipse-plugins，jar包在plugins\org.hibernate.eclipse_3.2.4.GA-R200905070146-H18\lib\tools\hibernate-tools.jar

pojo\PojoFields.ftl

<#-- // Fields -->

<#foreach field in pojo.getAllPropertiesIterator()><#if pojo.getMetaAttribAsBool(field, "gen-property", true)>    /** *//** *//** *//**
<#if pojo.hasMetaAttribute(field, "field-description")>
     ${pojo.getFieldJavaDoc(field, 0)}
</#IF>
<#foreach column in field.columnIterator><#if column.comment?exists && column.comment?trim?length!=0>     * ${column.comment}.
</#IF>
</#FOREACH>
     */
    ${pojo.getFieldModifiers(field)} ${pojo.getJavaTypeName(field, jdk5)} ${field.name}<#if pojo.hasFieldInitializor(field, jdk5)> = ${pojo.getFieldInitialization(field, jdk5)}</#IF>;
</#IF>
</#FOREACH>

pojo\PojoPropertyAccessors.ftl

<#-- // Property accessors -->
<#foreach property in pojo.getAllPropertiesIterator()>
<#if pojo.getMetaAttribAsBool(property, "gen-property", true)>
    /** *//**
<#if pojo.hasFieldJavaDoc(property)>
     * ${pojo.getFieldJavaDoc(property, 4)}
</#IF>
<#foreach column in property.columnIterator><#if column.comment?exists && column.comment?trim?length!=0>     * 取得 ${column.comment}.
</#IF>
</#FOREACH>
     */
    <#include "GetPropertyAnnotation.ftl"/>
    ${pojo.getPropertyGetModifiers(property)} ${pojo.getJavaTypeName(property, jdk5)} ${pojo.getGetterSignature(property)}() {
        return this.${property.name};
    }

    /** *//**
<#if pojo.hasFieldJavaDoc(property)>
     * ${pojo.getFieldJavaDoc(property, 4)}
</#IF>
<#foreach column in property.columnIterator><#if column.comment?exists && column.comment?trim?length!=0>     * 设置 ${column.comment}.
</#IF>
</#FOREACH>
     */
    ${pojo.getPropertySetModifiers(property)} void set${pojo.getPropertyName(property)}(${pojo.getJavaTypeName(property, jdk5)} ${property.name}) {
        this.${property.name} = ${property.name};
    }
</#IF>
</#FOREACH>

org\hibernate\tool\hbm2x\TemplateProducer.java

public void produce(Map additionalContext, String templateName, File destination, String identifier, String fileType, String rootContext) {

        String tempResult = produceToString( additionalContext, templateName, rootContext );

        if(tempResult.trim().length()==0) {
            log.warn("Generated output is empty. Skipped creation for file " + destination);
            return;
        }
        FileWriter fileWriter = null;
        Writer fileWriter = null;
        try {

            th.ensureExistence( destination );    

            ac.addFile(destination, fileType);
            log.debug("Writing " + identifier + " to " + destination.getAbsolutePath() );
            fileWriter = new FileWriter(destination);
            fileWriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(destination), "UTF-8"));

            fileWriter.write(tempResult);
        }
        catch (Exception e) {
            throw new ExporterException("Error while writing result to file", e);
        } finally {
            if(fileWriter!=null) {
                try {
                    fileWriter.flush();
                    fileWriter.close();
                }
                catch (IOException e) {
                    log.warn("Exception while flushing/closing " + destination,e);
                }
            }
        }

    }

org\hibernate\tool\hbm2x\jtidy.properties

indent=auto
indent-spaces=4
#indent-attributes=yes
    wrap=180
markup=yes
clean=yes
output-xml=yes
input-xml=yes
show-warnings=yes
trim-empty-elements=yes
input-encoding=utf-8
output-encoding=utf-8