Axis1.4底层加载server-config.wsdd文件的过程
曾经做过两年的Axis2开发Webservice的各种接口，传参是XML报文，到如今已经快两年没怎么接触过Webservice相关的内容了。前一周，接了个需求，需要对外部系统提供一个Webservice接口，于是又回来折腾Webservice相关的东东。
因为看到外部系统之前与我们公司核心系统对接的Webservice采用的都是axis1.4的，于是，我就用axis1.4下弄了个小demo，因为考虑到业务需求，将最简单的demo升级了一下，传参入参自己设计了一套javaBean，就是之前的一篇文章里的demo。之后再结合业务需求，将这个demo放入到现有的系统中，各种测试都没有问题。
然而，虽然通过demo和网上的资料知道了Webservice的搭建过程，却不知道Webservice底层是怎么操作的，server-config.wsdd文件又是怎么加载的，于是，又把axis1.4相关的jar包都大致浏览了一遍。
首先，配置web.xml的时候，有这样的一段代码：
<listener> <listener-class>org.apache.axis.transport.http.AxisHTTPSessionListener</listener-class> </listener> <servlet> <servlet-name>AxisServlet</servlet-name> <servlet-class> org.apache.axis.transport.http.AxisServlet </servlet-class> <load-on-startup>2</load-on-startup> </servlet> <servlet-mapping> <servlet-name>AxisServlet</servlet-name> <url-pattern>/servlet/AxisServlet</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>AxisServlet</servlet-name> <url-pattern>/services/*</url-pattern> </servlet-mapping>
可以看到，axis其实本质还是一个servlet，通过路径org.apache.axis.transport.http.AxisServlet，找到这个servlet的初始化方法：
public class AxisServlet extends AxisServletBase：
public void init()
throws ServletException
{
super.init();
ServletContext context = getServletConfig().getServletContext();
isDebug = log.isDebugEnabled();
if (isDebug) {
log.debug("In servlet init");
}
this.transportName = getOption(context, "transport.name", "http");
if (JavaUtils.isTrueExplicitly(getOption(context, "use-servlet-security", null)))
{
this.securityProvider = new ServletSecurityProvider();
}
this.enableList = JavaUtils.isTrueExplicitly(getOption(context, "axis.enableListQuery", null));
this.jwsClassDir = getOption(context, "axis.jws.servletClassDir", null);
this.disableServicesList = JavaUtils.isTrue(getOption(context, "axis.disableServiceList", "false"));
this.servicesPath = getOption(context, "axis.servicesPath", "/services/");
if (this.jwsClassDir != null) {
if (getHomeDir() != null)
this.jwsClassDir = (getHomeDir() + this.jwsClassDir);
}
else {
this.jwsClassDir = getDefaultJWSClassDir();
}
initQueryStringHandlers();
try
{
ServiceAdmin.setEngine(getEngine(), context.getServerInfo());
} catch (AxisFault af) {
exceptionLog.info("Exception setting AxisEngine on ServiceAdmin " + af);
}
}
一般初始化的时候都会去加载各种需要的配置文件，这个servlet继承的父类里有这样的方法：（由上到下，分别是方法调用的过程）
AxisServletBase：
public void init()
throws ServletException
{
ServletContext context = getServletConfig().getServletContext();
this.webInfPath = context.getRealPath("/WEB-INF");
this.homeDir = context.getRealPath("/");
isDebug = log.isDebugEnabled();
if (log.isDebugEnabled()) log.debug("In AxisServletBase init");
this.isDevelopment = JavaUtils.isTrueExplicitly(getOption(context, "axis.development.system", null));
}
protected String getOption(ServletContext context, String param, String dephault)
{
String value = AxisProperties.getProperty(param);
if (value == null) {
value = getInitParameter(param);
}
if (value == null)
value = context.getInitParameter(param);
try {
AxisServer engine = getEngine(this);
if ((value == null) && (engine != null))
value = (String)engine.getOption(param);
}
catch (AxisFault axisFault) {
}
return (value != null) ? value : dephault;
}
public static AxisServer getEngine(HttpServlet servlet)
throws AxisFault
{
AxisServer engine = null;
if (isDebug) {
log.debug("Enter: getEngine()");
}
ServletContext context = servlet.getServletContext();
synchronized (context) {
engine = retrieveEngine(servlet);
if (engine == null) {
Map environment = getEngineEnvironment(servlet);
engine = AxisServer.getServer(environment);
engine.setName(servlet.getServletName());
storeEngine(servlet, engine);
}
}
if (isDebug) {
log.debug("Exit: getEngine()");
}
return engine;
}
protected static Map getEngineEnvironment(HttpServlet servlet)
{
Map environment = new HashMap();
String attdir = servlet.getInitParameter("axis.attachments.Directory");
if (attdir != null) {
environment.put("axis.attachments.Directory", attdir);
}
ServletContext context = servlet.getServletContext();
environment.put("servletContext", context);
String webInfPath = context.getRealPath("/WEB-INF");
if (webInfPath != null) {
environment.put("servlet.realpath", webInfPath + File.separator + "attachments");
}
EngineConfiguration config = EngineConfigurationFactoryFinder.newFactory(servlet).getServerEngineConfig();
if (config != null) {
environment.put("engineConfig", config);
}
return environment;
}
于是，我发现了EngineConfigurationFactoryFinder.newFactory(servlet).getServerEngineConfig();这个方法在axis的jar包中的这个类里：EngineConfigurationFactoryServlet
private static EngineConfiguration getServerEngineConfig(ServletConfig cfg)
{
ServletContext ctx = cfg.getServletContext();
String configFile = cfg.getInitParameter("axis.ServerConfigFile");
if (configFile == null) {
configFile = AxisProperties.getProperty("axis.ServerConfigFile");
}
if (configFile == null) {
configFile = "server-config.wsdd";
}
String appWebInfPath = "/WEB-INF";
FileProvider config = null;
String realWebInfPath = ctx.getRealPath(appWebInfPath);
if ((realWebInfPath == null) || (!new File(realWebInfPath, configFile).exists()))
{
String name = appWebInfPath + "/" + configFile;
InputStream is = ctx.getResourceAsStream(name);
if (is != null)
{
config = new FileProvider(is);
}
if (config == null) {
log.error(Messages.getMessage("servletEngineWebInfError03", name));
}
}
if ((config == null) && (realWebInfPath != null)) {
try {
config = new FileProvider(realWebInfPath, configFile);
} catch (ConfigurationException e) {
log.error(Messages.getMessage("servletEngineWebInfError00"), e);
}
}
if (config == null) {
log.warn(Messages.getMessage("servletEngineWebInfWarn00"));
try {
InputStream is = ClassUtils.getResourceAsStream(AxisServer.class, "server-config.wsdd");
config = new FileProvider(is);
} catch (Exception e) {
log.error(Messages.getMessage("servletEngineWebInfError02"), e);
}
}
return config;
}
}
找到这里，我们就可以知道，axis 的servlet是怎么取找server-config.wsdd文件，进而知道我们配置了那些service了。
