java ee5中開發web service__web

在java ee5之前，要使用java技術開發web service，需要藉助第三方的架構xfire,axis,cxf等，現在藉助最新的java ee5技術，不再需要向項目中引入大量第三方的jar檔案，有jdk 6就夠了。

 

使用步驟：

1.web service代碼

package com.test;

import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.jws.WebService;
import javax.jws.soap.SOAPBinding;
import javax.jws.soap.SOAPBinding.Style;

@WebService(targetNamespace="http://demo.test.org/hello")
@SOAPBinding(style=Style.RPC)

public class TestService {

 

 @WebMethod(operationName="Hello")
 public String sayHello(@WebParam(name="name")String msg){
  return "Hello :"+msg;
 }

}

代碼很簡單，不需要實現什麼介面，也不需要繼承自什麼特殊的超類，與普通的java類相比，最大的區別是大量的使用了注釋技術。注意上面的@SOAPBinding(style=Style.RPC)不能省略，否則會報異常：

嚴重: StandardWrapper.Throwable
com.sun.xml.internal.ws.model.RuntimeModelerException: runtime modeler error: Wrapper class com.test.jaxws.SayHello is not found. Have you run APT to generate them?

 

嚴重: Servlet /m4 threw load() exception
com.sun.xml.internal.ws.model.RuntimeModelerException: runtime modeler error: Wrapper class com.test.jaxws.SayHello is not found. Have you run APT to generate them?

 

2.發布服務

   和以前的web service開發技術相比較，現在需要用程式碼發布一下自己開發的web serivce，建立一個serlvet，在init代碼中寫發布代碼

 

package com.test;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.xml.ws.Endpoint;

 

public class WebServiceLoader extends HttpServlet {

 

 private static final long serialVersionUID = 1L;

 public WebServiceLoader() {
  super();
 }

 public void destroy() {
  super.destroy();
 }

 public void init() throws ServletException {
  System.out.println("Web Service發布中......");
  Endpoint.publish("http://0.0.0.0:8081/Hello", new TestService());
  System.out.println("Web Service發布完成");
 }

}

注意連接埠號碼問題，上面的範例程式碼中使用的是8081連接埠，如果發布到已經被佔用的連接埠將會失敗(如tomcat本身工作在8080,如果再發布到8080就會失敗。)

 

3.配置servlet自動載入

 

開啟web.xml，配置servlet為自動載入

 

  <servlet>
    <servlet-name>WebServiceLoader</servlet-name>
    <servlet-class>com.test.WebServiceLoader</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>

4.訪問wsdl

   部署程式，啟動容器，如tomcat等，然後開啟瀏覽器，訪問 http://localhost:8081/Hello?wsdl  可以看到wsdl描述符。

    <?xml version="1.0" encoding="UTF-8" ?> - <!--

 Published by JAX-WS RI at http://jax-ws.dev.java.net. RI's version is JAX-WS RI 2.1.1 in JDK 6. 

  --> - <!--

 Generated by JAX-WS RI at http://jax-ws.dev.java.net. RI's version is JAX-WS RI 2.1.1 in JDK 6. 

  --> - < definitions xmlns:soap =" http://schemas.xmlsoap.org/wsdl/soap/ " xmlns:tns =" http://demo.test.org/hello " xmlns:xsd =" http://www.w3.org/2001/XMLSchema " xmlns =" http://schemas.xmlsoap.org/wsdl/ " targetNamespace =" http://demo.test.org/hello " name =" TestServiceService ">   < types /> - < message name =" Hello ">   < part name =" name " type =" xsd:string " />   </ message > - < message name =" HelloResponse ">   < part name =" return " type =" xsd:string " />   </ message > - < portType name =" TestService "> - < operation name =" Hello " parameterOrder =" name ">   < input message =" tns:Hello " />   < output message =" tns:HelloResponse " />   </ operation >   </ portType > - < binding name =" TestServicePortBinding " type =" tns:TestService ">   < soap:binding transport =" http://schemas.xmlsoap.org/soap/http " style =" rpc " /> - < operation name =" Hello ">   < soap:operation soapAction =" " /> - < input >   < soap:body use =" literal " namespace =" http://demo.test.org/hello " />   </ input > - < output >   < soap:body use =" literal " namespace =" http://demo.test.org/hello " />   </ output >   </ operation >   </ binding > - < service name =" TestServiceService "> - < port name =" TestServicePort " binding =" tns:TestServicePortBinding ">   < soap:address location =" http://localhost:8081/Hello " />   </ port >   </ service >   </ definitions >