axis 源码初步研读
经过反复跟踪，这段代码比较重要：

org.apache.axis.Message.java

另外，贴一些通过 Thread.dumpStack() 打印出来的程序流程：

java.lang.reflect.InvocationTargetExceptionat sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)at java.lang.reflect.Method.invoke(Unknown Source)at org.apache.axis.configuration.EngineConfigurationFactoryFinder.newFactory(EngineConfigurationFactoryFinder.java:189)at org.apache.axis.configuration.EngineConfigurationFactoryFinder.access$2(EngineConfigurationFactoryFinder.java:163)at org.apache.axis.configuration.EngineConfigurationFactoryFinder$1.run(EngineConfigurationFactoryFinder.java:128)at java.security.AccessController.doPrivileged(Native Method)at org.apache.axis.configuration.EngineConfigurationFactoryFinder.newFactory(EngineConfigurationFactoryFinder.java:113)at org.apache.axis.configuration.EngineConfigurationFactoryFinder.newFactory(EngineConfigurationFactoryFinder.java:160)at org.apache.axis.client.Service.getEngineConfiguration(Service.java:813)at org.apache.axis.client.Service.getAxisClient(Service.java:104)at org.apache.axis.client.Service.<init>(Service.java:113)at com.mns.SendMessageServiceLocator.<init>(SendMessageServiceLocator.java:12)at com.mns.ZTestSendMsg.test_main1(ZTestSendMsg.java:114)at com.mns.ZTestSendMsg.main(ZTestSendMsg.java:55)java.lang.Exception: Stack traceat java.lang.Thread.dumpStack(Unknown Source)at org.apache.axis.client.Call.invokeEngine(Call.java:2816)at org.apache.axis.client.Call.invoke(Call.java:2799)at org.apache.axis.client.Call.invoke(Call.java:2444)at org.apache.axis.client.Call.invoke(Call.java:2367)at org.apache.axis.client.Call.invoke(Call.java:1812)at com.mns.SendMessageBindingStub.sendMessage(SendMessageBindingStub.java:442)at com.mns.ZTestSendMsg.test_main1(ZTestSendMsg.java:278)at com.mns.ZTestSendMsg.main(ZTestSendMsg.java:55)2817:service.getEngine():org.apache.axis.client.AxisClient@5812f9eejava.lang.Exception: Stack traceat java.lang.Thread.dumpStack(Unknown Source)at org.apache.axis.attachments.MimeUtils.createMP(MimeUtils.java:248)at org.apache.axis.attachments.AttachmentsImpl.getContentType(AttachmentsImpl.java:567)at org.apache.axis.Message.getContentType(Message.java:489)at org.apache.axis.transport.http.HTTPSender.writeToSocket(HTTPSender.java:343)at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:138)at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118)at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)at org.apache.axis.client.AxisClient.invoke(AxisClient.java:175)at org.apache.axis.client.Call.invokeEngine(Call.java:2818)at org.apache.axis.client.Call.invoke(Call.java:2799)at org.apache.axis.client.Call.invoke(Call.java:2444)at org.apache.axis.client.Call.invoke(Call.java:2367)at org.apache.axis.client.Call.invoke(Call.java:1812)at com.mns.SendMessageBindingStub.sendMessage(SendMessageBindingStub.java:442)at com.mns.ZTestSendMsg.test_main1(ZTestSendMsg.java:278)at com.mns.ZTestSendMsg.main(ZTestSendMsg.java:55)java.lang.Exception: Stack traceat java.lang.Thread.dumpStack(Unknown Source)at org.apache.axis.Message.writeTo(Message.java:536)at org.apache.axis.transport.http.HTTPSender.writeToSocket(HTTPSender.java:514)at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:138)at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118)at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)at org.apache.axis.client.AxisClient.invoke(AxisClient.java:175)at org.apache.axis.client.Call.invokeEngine(Call.java:2818)at org.apache.axis.client.Call.invoke(Call.java:2799)at org.apache.axis.client.Call.invoke(Call.java:2444)at org.apache.axis.client.Call.invoke(Call.java:2367)at org.apache.axis.client.Call.invoke(Call.java:1812)at com.mns.SendMessageBindingStub.sendMessage(SendMessageBindingStub.java:442)at com.mns.ZTestSendMsg.test_main1(ZTestSendMsg.java:278)at com.mns.ZTestSendMsg.main(ZTestSendMsg.java:55)java.lang.Exception: Stack traceat java.lang.Thread.dumpStack(Unknown Source)at org.apache.axis.attachments.AttachmentsImpl.writeContentToStream(AttachmentsImpl.java:520)at org.apache.axis.Message.writeTo(Message.java:548)at org.apache.axis.transport.http.HTTPSender.writeToSocket(HTTPSender.java:514)at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:138)at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118)at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)at org.apache.axis.client.AxisClient.invoke(AxisClient.java:175)at org.apache.axis.client.Call.invokeEngine(Call.java:2818)at org.apache.axis.client.Call.invoke(Call.java:2799)at org.apache.axis.client.Call.invoke(Call.java:2444)at org.apache.axis.client.Call.invoke(Call.java:2367)at org.apache.axis.client.Call.invoke(Call.java:1812)at com.mns.SendMessageBindingStub.sendMessage(SendMessageBindingStub.java:442)at com.mns.ZTestSendMsg.test_main1(ZTestSendMsg.java:278)at com.mns.ZTestSendMsg.main(ZTestSendMsg.java:55)(org.apache.axis.attachments.AttachmentsImpl.java:522)