J2ME与Web Service-KSOAP的快速上手
2008-01-05 08:56:58 来源:WEB开发网 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1、服务端
这次要发布的web service非常简单。它的功能是把从客户端传入的字符串中的小写字母转变成大写字母,再返回给客户端。
Soap 服务器采用apache的AXIS(可以从http://ws.apache.org/axis/下载),应用服务器可以选用各种servlet 容器,我这里采用的是weblogic。
1.1 实现类的源代码:
// StringPRocessor.java
package com.jagie.j2me.ws;
public class StringProcessor
{
public StringProcessor()
{
}
public String process(String name)
{
return name.toUpperCase();
}
}
1.2 发布步骤
1.预备一个目录作为web application的发布目录,我这里的这个目录叫jagiews,这个目录的全路径中最好不要有空格和中文。我的发布目录结构如下:
2.编译StringProcessor.java,把生成的StringProcessor.class置于: \jagiews\WEB-INF\classes\com\jagie\j2me\ws目录下。
3.在jagiews\WEB-INF\lib 文件夹中置入以下axis服务器需要的jar文件 axis.jar,axis-ant.jar,commons-discovery.jar,commons-logging.jar,jaxrpc.jar,log4j-1.2.8.jar,saaj.jar ,wsdl4j.jar。这些文件可以在http://ws.apache.org/axis/下载。
4.在jagiews\WEB-INF目录下增加2个发布描述文件:
server-config.wsdd,web.xml。
#server-config.wsdd
<?xml version="1.0" encoding="UTF-8"?>
<deployment xmlns=
"http://xml.apache.org/axis/wsdd/"
xmlns:java=
"http://xml.apache.org/axis/wsdd/providers/java">
<globalConfiguration>
<parameter name=
"adminPassWord" value="admin"/>
<parameter name=
"attachments.Directory"
value="C:\Program Files
\Apache Tomcat 4.0\webapps
\axis\WEB-INF\attachments"/>
<parameter name=
"attachments.implementation"
value="org.apache.axis.
attachments.AttachmentsImpl"/>
<parameter name=
"sendXsiTypes"
value="true"/>
<parameter name=
"sendMultiRefs"
value="true"/>
<parameter name=
"sendXMLDeclaration"
value="true"/>
<parameter name=
"axis.sendMinimizedElements"
value="true"/>
<requestFlow>
<handler type=
"java:org.apache.axis.handlers.JWSHandler">
<parameter
name="scope"
value="session"/>
</handler>
<handler type=
"java:org.apache.axis.handlers.JWSHandler">
<parameter
name="scope"
value="request"/>
<parameter
name="extension"
value=".jwr"/>
</handler>
</requestFlow>
</globalConfiguration>
<handler name=
"LocalResponder"
type="java:org.apache.axis.
transport.local.LocalResponder"/>
<handler name="URLMapper"
type="java:org.apache.axis.
handlers.http.URLMapper"/>
<handler name="RPCDispatcher"
type="java:org.apache.axis.
providers.java.RPCProvider"/>
<handler name="Authenticate"
type="java:org.apache.axis.
handlers.SimpleAuthenticationHandler"/>
<handler name="MsgDispatcher"
type="java:org.apache.axis.
providers.java.MsgProvider"/>
<service name="AdminService"
provider="java:MSG">
<parameter name="allowedMethods"
value="AdminService"/>
<parameter name="enableRemoteAdmin"
value="false"/>
<parameter name="className"
value="org.apache.axis.utils.Admin"/>
<namespace>
http://xml.apache.org/axis/wsdd/
</namespace>
</service>
<service name="Version"
provider="java:RPC">
<parameter name="allowedMethods"
value="getVersion"/>
<parameter name="className"
value="org.apache.axis.Version"/>
</service>
<!-- your service begin-->
<service name="StringProcess"
provider="java:RPC">
<parameter name="allowedMethods"
value="process"/>
<parameter name="className"
value="com.jagie.j2me.
ws.StringProcessor"/>
</service>
<!-- your service end -->
<transport name="http">
<requestFlow>
<handler type="URLMapper"/>
<handler type=
"java:org.apache.axis.handlers.
http.HTTPAuthHandler"/>
</requestFlow>
</transport>
<transport name="local">
<responseFlow>
<handler type="java:org.apache.axis.
transport.local.LocalResponder"/>
</responseFlow>
</transport>
</deployment>
# web.xml
<?xml version="1.0"
encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems,
Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com
/j2ee/dtds/web-app_2.2.dtd">
<web-app>
<display-name>Apache-Axis</display-name>
<servlet>
<servlet-name>AxisServlet</servlet-name>
<display-name>Apache-Axis
Servlet</display-name>
<servlet-class>
org.apache.axis.transport.http.AxisServlet
</servlet-class>
</servlet>
<servlet>
<servlet-name>AdminServlet</servlet-name>
<display-name>Axis Admin Servlet</display-name>
<servlet-class>
org.apache.axis.transport.http.AdminServlet
</servlet-class>
<load-on-startup>100</load-on-startup>
</servlet>
<servlet>
<servlet-name>SOAPMonitorService</servlet-name>
<display-name>SOAPMonitorService</display-name>
<servlet-class>
org.apache.axis.monitor.SOAPMonitorService
</servlet-class>
<init-param>
<param-name>SOAPMonitorPort</param-name>
<param-value>5001</param-value>
</init-param>
<load-on-startup>100</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>*.jws</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>AxisServlet</servlet-name>
<url-pattern>/services/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>SOAPMonitorService</servlet-name>
<url-pattern>/SOAPMonitor</url-pattern>
</servlet-mapping>
<!-- uncomment this if you want the admin servlet -->
<!--
<servlet-mapping>
<servlet-name>AdminServlet</servlet-name>
<url-pattern>/servlet/AdminServlet
</url-pattern>
</servlet-mapping>
-->
<!-- currently the W3C havent settled
on a media type for WSDL;
http://www.w3.org/TR/2003/
WD-wsdl12-20030303/#ietf-draft
for now we go with the basic
''it''s XML'' response -->
<mime-mapping>
<extension>wsdl</extension>
<mime-type>text/xml</mime-type>
</mime-mapping>
<mime-mapping>
<extension>xsd</extension>
<mime-type>text/xml</mime-type>
</mime-mapping>
</web-app>
5.开启你的application server,把目录jagiews发布为一个名叫jagiews的web application。
6.测试:打开浏览器,输入网址(这里使用的是weblogic,其他的服务器请酌情修改): http://localhost:7001/jagiews/services/StringProcess?method=process&name=QQqq,假如浏览器能在返回的xml文档中显示字符串"QQQQ",恭喜你,你的web service发布成功了。假如发布不成功,请按以上发布步骤检查一下。
2、客户端
客户端自然是用MIDlet了,不过用什么方式来访问web service呢?其实有3种访问方式
直接用HttpConnection访问 http://localhost:7001/jagiews/services/StringProcess?method=process&name=qqqq,得到xml的返回数据,然后用kxml(http://kxml.enhydra.org/)解析,得到返回值。
假如你的手机支持MIDP2.0的话,可以考虑使用JSR172。
用ksoap api。
这里讲述第三种方式。使用之前,你需要从 http://ksoap.enhydra.org/software/downloads/index.Html下载稳定的ksoap包,置于你的classpath中。
2.1 客户端源代码
2.1.1 WSClientMIDlet.java
package com.jagie.j2me.ws;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
/**
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c)
2004</p>
* <p>Company: </p>
* @author not attributable
* @version 1.0
*/
public class WSClientMIDlet
extends MIDlet
{
static WSClientMIDlet instance;
public WSClientMIDlet()
{
instance = this;
}
public void startApp()
{
Display display=
Display.getDisplay(this);
DisplayForm displayable =
new DisplayForm();
display.setCurrent(displayable);
}
public void pauseApp()
{
}
public void destroyApp
(boolean unconditional)
{
}
public static void quitApp()
{
instance.destroyApp(true);
instance.notifyDestroyed();
instance = null;
}
}
2.1.2 DisplayForm.java
package com.jagie.j2me.ws;
import javax.microedition.lcdui.*;
/**
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c)
2004</p>
* <p>Company: </p>
* @author not attributable
* @version 1.0
*/
public class DisplayForm
extends Form
implements CommandListener,
Runnable
{
private TextField textField1;
private Thread t;
public DisplayForm()
{
super("字符转换webservice测试");
try
{
jbInit();
}
catch (Exception e)
{
e.printStackTrace();
}
}
private void jbInit()
throws Exception
{
// Set up this Displayable
to listen to command events
textField1 = new TextField
("", "", 15, TextField.ANY);
this.setCommandListener(this);
textField1.setLabel
("待处理的字符串是:");
textField1.setConstraints
(TextField.ANY);
textField1.setInitialInputMode
("Tester");
setCommandListener(this);
// add the Exit command
addCommand(new Command
("Exit", Command.EXIT, 1));
addCommand(new Command
("Process", Command.OK, 1));
this.append(textField1);
}
public void commandAction
(Command command,
Displayable displayable)
{
if (command.getCommandType
() == Command.EXIT)
{
WSClientMIDlet.quitApp();
}
else if (command.getCommandType()
== Command.OK)
{
t = new Thread(this);
t.start();
}
}
public void run()
{
String s1 =
textField1.getString();
String s2 =
new StringProcessorStub().process(s1);
StringItem resultItem =
new StringItem("处理后的字符串是:", s2);
this.append(resultItem);
}
}
2.1.3 StringProcessorStub.java
package com.jagie.j2me.ws;
import org.ksoap.*;
import org.ksoap.transport.HttpTransport;
/**
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2004</p>
* <p>Company: </p>
* @author not attributable
* @version 1.0
*/
public class StringProcessorStub
{
public StringProcessorStub()
{
}
public String process(String name)
{
String result = null;
try
{
SoapObject rpc =
new SoapObject
("http://localhost:
7001/jagiews/services/StringProcess",
"process");
rpc.addProperty("name", name);
HttpTransport ht =
new HttpTransport
("http://localhost:7001/
jagiews/services/StringProcess",
"");
result = (String) ht.call(rpc);
}
catch (Exception e) {
e.printStackTrace();
}
return result;
}
}
总结
有了ksoap,手机上调用web service就很轻易了。不过要注重的是,使用网络连接这种费时操作的时候,一定要单独开线程进行,不要直接写在commandAction()方法里,否则出现画面被锁住的情况。
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