看了spring test 用例，其实实现这一功能还算比较简单，主要分以下的步骤，具体的实例可以去参考spring 自带的testcase

首先定义相关xsd文件，用于验证相应的行为：

主要增加了4个自定义元素和1个属性：

xmlns:xsd="http://www.w3.org/2001/xmlschema"
targetnamespace="http://www.springframework.org/schema/beans/test"
elementformdefault="qualified">

接着定义handler映射文件：customnamespace.properties

http\://www.springframework.org/schema/beans/test=org.springframework.beans.factory.xml.support.testnamespacehandler

定义handler:

主要注册相应的解析类和装饰类

publicclass testnamespacehandler extends namespacehandlersupport {

publicvoid init() {

//相对于每个xsd中定义的元素

registerbeandefinitionparser("testbean", new testbeandefinitionparser());

registerbeandefinitiondecorator("set", new propertymodifyingbeandefinitiondecorator());

registerbeandefinitiondecorator("debug", new debugbeandefinitiondecorator());

registerbeandefinitiondecorator("nop", new nopinterceptorbeandefinitiondecorator());

registerbeandefinitiondecoratorforattribute("object-name", new objectnamebeandefinitiondecorator());

}

}

定义各个解析类：

privatestaticclass testbeandefinitionparser implements beandefinitionparser {

public beandefinition parse(element element, parsercontext parsercontext) {

rootbeandefinition definition = new rootbeandefinition();

definition.setbeanclass(testbean.class);

mutablepropertyvalues mpvs = new mutablepropertyvalues();

mpvs.addpropertyvalue("name", element.getattribute("name"));

mpvs.addpropertyvalue("age", element.getattribute("age"));

definition.setpropertyvalues(mpvs);

parsercontext.getregistry().registerbeandefinition(element.getattribute("id"), definition);

returnnull;

}

}

privatestaticclasspropertymodifyingbeandefinitiondecorator implements beandefinitiondecorator {

public beandefinitionholder decorate(node node, beandefinitionholder definition,

parsercontext parsercontext) {

element element = (element)node;

beandefinition def = definition.getbeandefinition();

mutablepropertyvalues mpvs = (def.getpropertyvalues() == null) ?

new mutablepropertyvalues() : def.getpropertyvalues();

mpvs.addpropertyvalue("name", element.getattribute("name"));

mpvs.addpropertyvalue("age", element.getattribute("age"));

((abstractbeandefinition) def).setpropertyvalues(mpvs);

return definition;

}

}

privatestaticclassdebugbeandefinitiondecorator extends abstractinterceptordrivenbeandefinitiondecorator {

protected beandefinition createinterceptordefinition(node node) {

returnnew rootbeandefinition(debuginterceptor.class);

}

}

privatestaticclassnopinterceptorbeandefinitiondecorator extends

abstractinterceptordrivenbeandefinitiondecorator {

protected beandefinition createinterceptordefinition(node node) {

returnnew rootbeandefinition(nopinterceptor.class);

}

}

privatestaticclassobjectnamebeandefinitiondecorator implements beandefinitiondecorator {

public beandefinitionholder decorate(node node, beandefinitionholder definition,

parsercontext parsercontext) {

attr objectnameattribute = (attr)node;

definition.getbeandefinition().setattribute("objectname", objectnameattribute.getvalue());

return definition;

}

}

可以定义entityresolver，用于验证相应的xsd

privateclass dummyschemaresolver extends pluggableschemaresolver {

public dummyschemaresolver() {

super(customnamespacehandlertests.this.getclass().getclassloader());

}

public inputsource resolveentity(string publicid, string systemid) throws ioexception {

inputsource source = super.resolveentity(publicid, systemid);

if (source == null) {

resource resource =
new classpathresource("org/springframework/beans/factory/xml/support/spring-test.xsd");

source = new inputsource(resource.getinputstream());

source.setpublicid(publicid);

source.setsystemid(systemid);

}

return source;

}

}

关键的一步，如何生效：

string location = "org/springframework/beans/factory/xml/support/customnamespace.properties";

namespacehandlerresolver resolver = new defaultnamespacehandlerresolver(
getclass().getclassloader(), location);

defaultlistablebeanfactory beanfactory = new defaultlistablebeanfactory();

xmlbeandefinitionreader reader = new xmlbeandefinitionreader(beanfactory);

reader.setnamespacehandlerresolver(resolver);

reader.setvalidationmode(xmlbeandefinitionreader.validation_xsd);

reader.setentityresolver(new dummyschemaresolver());

reader.loadbeandefinitions(getresource());

写一个测试xml文件：

xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"

xmlns:test="http://www.springframework.org/schema/beans/test"

xsi:schemalocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd

http://www.springframework.org/schema/beans/testhttp://www.springframework.org/schema/beans/factory/xml/support/spring-test.xsd">

相关的测试方法：

publicvoid testsimpleparser() throws exception {

testbean bean = (testbean) this.beanfactory.getbean("testbean");

assettestbean(bean);

}

publicvoid testsimpledecorator() throws exception {

testbean bean = (testbean) this.beanfactory.getbean("customisedtestbean");

assettestbean(bean);

}

publicvoid testproxyingdecorator() throws exception {

itestbean bean = (itestbean) this.beanfactory.getbean("debuggingtestbean");

assettestbean(bean);

asserttrue(aoputils.isaopproxy(bean));

advisor[] advisors = ((advised) bean).getadvisors();

assertequals("incorrect number of advisors", 1, advisors.length);

assertequals("incorrect advice class.", debuginterceptor.class, advisors[0].getadvice().getclass());

}

publicvoid testchaineddecorators() throws exception {

itestbean bean = (itestbean) this.beanfactory.getbean("chainedtestbean");

assettestbean(bean);

asserttrue(aoputils.isaopproxy(bean));

advisor[] advisors = ((advised) bean).getadvisors();

assertequals("incorrect number of advisors", 2, advisors.length);

assertequals("incorrect advice class.", debuginterceptor.class, advisors[0].getadvice().getclass());

assertequals("incorrect advice class.", nopinterceptor.class, advisors[1].getadvice().getclass());

}

publicvoid testdecorationviaattribute() throws exception {

rootbeandefinition beandefinition
= (rootbeandefinition)this.beanfactory.getbeandefinition("decoratewithattribute");

assertequals("foo", beandefinition.getattribute("objectname"));

}

privatevoid assettestbean(itestbean bean) {

assertequals("invalid name", "rob harrop", bean.getname());

assertequals("invalid age", 23, bean.getage());

}