java是一个循环往复螺旋式上升的学习过程，因此，这对我们的耐力和动力要求很高。今天就主要来为大家介绍一下在java中如何用SOAP调用webservice，以及怎么编写它的接口。
想用soap调用webservice之前，我们需要下载jar,SOAP使用HTTP传送 XML。虽然HTTP 不是有效率的通讯协议，而且XML还需要额外的文件解析(parse)，两者使得交易的速度大大低于其它方案。但是XML是一个开放、健全、有语义的讯息机制，而HTTP是一个广泛又能避免许多关于防火墙的问题，从而使SOAP得到了广泛的应用。但是考虑到效率的话，最好还是使用其他的方式更加好。
接下来为大家展示一个实际的代码：
import org.apache.soap.util.xml.*;
import org.apache.soap.*;
import org.apache.soap.rpc.*;
import java.io.*;
import java.net.*;
import java.util.Vector;
public class caService
{
public static String getService(String user)
{
URL url = null;
try
{
url = new URL(
"http://192.168.0.100:8080/ca3/services/caSynrochnized");
}
catch (MalformedURLException mue)
{
return mue.getMessage();
}
// This is the main SOAP object
Call soapCall = new Call();
// Use SOAP encoding
soapCall.setEncodingStyleURI(Constants.NS_URI_SOAP_ENC);
// This is the remote object we're asking for the price
soapCall.setTargetObjectURI("urn:xmethods-caSynrochnized");
// This is the name of the method on the above object
soapCall.setMethodName("getUser");
// We need to send the ISBN number as an input parameter to the method
Vector soapParams = new Vector();
// name, type, value, encoding style
Parameter isbnParam = new Parameter("userName", String.class, user
, null);
soapParams.addElement(isbnParam);
soapCall.setParams(soapParams);
try
{
// Invoke the remote method on the object
Response soapResponse = soapCall.invoke(url, "");
// Check to see if there is an error, return "N/A"
if (soapResponse.generatedFault())
{
Fault fault = soapResponse.getFault();
String f = fault.getFaultString();
return f;
}
else
{
// read result
Parameter soapResult = soapResponse.getReturnValue();
// get a string from the result
return soapResult.getValue()
.toString();
}
}
catch (SOAPException se)
{
return se.getMessage();
}
}
}接下来我们看一下如何在java中写webservice的接口，主要是为了部署到Tomcat下面的。首先⑴、创建一个web项目，然后添加jar包，代码如下：
<dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <!-- 这里直接导入整个项目下的所有jar包，其中去除几个 --> <dependency> <groupId>org.apache.cxf</groupId> <artifactId>apache-cxf</artifactId> <version>3.2.6</version> <type>pom</type> <exclusions> <exclusion> <artifactId>cxf-services-wsn-api</artifactId> <groupId>org.apache.cxf.services.wsn</groupId> </exclusion> <exclusion> <artifactId>cxf-services-wsn-core</artifactId> <groupId>org.apache.cxf.services.wsn</groupId> </exclusion> <exclusion> <artifactId>cxf-services-ws-discovery-api</artifactId> <groupId>org.apache.cxf.services.ws-discovery</groupId> </exclusion> <exclusion> <artifactId>cxf-services-ws-discovery-service</artifactId> <groupId>org.apache.cxf.services.ws-discovery</groupId> </exclusion> </exclusions> </dependency> </dependencies>
⑵、然后再添加web.xml，代码如下：
<?xml version="1.0" encoding="UTF-8"?> <web-app id="WebApp_ID" version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <servlet> <description>Apache CXF Endpoint</description> <display-name>cxf</display-name> <servlet-name>cxf</servlet-name> <servlet-class>org.apache.cxf.transport.servlet.CXFServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>cxf</servlet-name> <url-pattern>/services/*</url-pattern> </servlet-mapping> </web-app>
⑶、之后写一个接口，代码如下：
import javax.jws.WebService;
@WebService
public interface MsgService
{
public String getValue(String name);
}⑷、接着写接口的实现类，代码如下：
package com.msg.webservice.impl;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.jws.WebService;
import com.msg.util.Log_Exception;
import com.msg.util.UrlUtil;
import com.msg.util.Util;
import com.msg.webservice.MsgService;
@WebService(endpointInterface = "com.msg.webservice.MsgService")
public class MsgServiceImpl implements MsgService
{
public String getValue(String name)
{
return "我叫" + name;
}
}⑸、再之后是cxf-servlet.xml，代码如下：
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:jaxws="http://cxf.apache.org/jaxws" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://cxf.apache.org/jaxws http://cxf.apache.org/schemas/jaxws.xsd"> <import resource="classpath:META-INF/cxf/cxf.xml" /> <import resource="classpath:META-INF/cxf/cxf-servlet.xml" /> //implementor:实现类的地址 address：调用时的地址 <jaxws:endpoint id="personQueryService" implementor="com.msg.webservice.impl.MsgServiceImpl" address="/msgservice" /> </beans>
⑹、client-beans.xml，代码展示：
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:jaxws="http://cxf.apache.org/jaxws" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://cxf.apache.org/jaxws http://cxf.apache.org/schema/jaxws.xsd"> //class：接口地址 <bean id="client" class="com.msg.webservice.MsgService" factory-bean="clientFactory" factory-method="create" /> <bean id="clientFactory" class="org.apache.cxf.jaxws.JaxWsProxyFactoryBean"> //value：接口地址 <property name="serviceClass" value="com.msg.webservice.MsgService" /> //value：调用时的地址 <property name="address" value="http://192.168.1.10:9090/MSService/services/msgservice" /> </bean> </beans>
⑺、启动Tomcat；
⑻、图片展示：
⑼、调用接口。
以上就是有关在java中怎么用SOAP调用webservice以及写它的接口的具体操作方法。想要了解更多java经典例子，敬请关注奇Q工具网。
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