2006年10月22日随笔档案 - Rory's Blog

2006年10月22日

xstream是个好东西。对于配置文件的读取很方便。在mybog中我就用到了。不过今天打算用yupoo的api来做相册。发现xstream对于xmlnode的attribute解析支持不是那么的好。
对于这种节点格式的非常的简单

<result>
    <page>1</page>
    <pages>1</pages>
    <perpage>100</perpage>
    <total>19</total>
    <photos>
        <photo>
            <id>ff8080810fc8ac78010fd3f158d40a52</id>
            <owner>ff8080810f1a387b010f1a83d6530dfc</owner>
            <title>Gmail-2</title>
            <host>4</host>
            <dir>20061230</dir>
            <filename>231905_1463411198</filename>
        </photo>
    </photos>
</result>

简单的alias一下就可以读到值了

File file = new File("src/test/java/com/jdkcn/test/result.xml");
BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), "UTF-8"));
XStream stream = new XStream();
stream.alias("result", YupooResult.class);
stream.alias("photo",YupooPhoto.class);
YupooResult result = (YupooResult)stream.fromXML(reader);

可是Yupoo的api返回的xmlrpc的结果是这样的

这样就load不到值了。没法去mailist里面找答案，果然有人问。

Hello,

I am not sure about the subject but here is what I needed help for:

XML:

<field name="value">I am a Field.</field>

I have already tried several structures and nothing seem to work.

Is this possible for XStream? :)

How is the Java class form to support this?

Thanks!




有人回答是看Converter的文档。果然找到答案了。
自己写一个converter就可以了。
下面是我的converter
package com.jdkcn.xstream;

import java.util.ArrayList;
import java.util.List;

import com.jdkcn.yupoo.YupooPhoto;
import com.jdkcn.yupoo.YupooResult;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;

/**
 * @author <a href="mailto:rory.cn@gmail.com">somebody</a>
 * @since Jan 16, 2007 6:12:35 PM
 * @version $Id YupooResultConverter.java$
 */
public class YupooResultConverter implements Converter {
    /* (non-Javadoc)
     * @see com.thoughtworks.xstream.converters.Converter#marshal(java.lang.Object, com.thoughtworks.xstream.io.HierarchicalStreamWriter, com.thoughtworks.xstream.converters.MarshallingContext)
     */
    public void marshal(Object obj, HierarchicalStreamWriter writer, MarshallingContext context) {
        // FIXME unfinish.
    }

    /* (non-Javadoc)
     * @see com.thoughtworks.xstream.converters.Converter#unmarshal(com.thoughtworks.xstream.io.HierarchicalStreamReader, com.thoughtworks.xstream.converters.UnmarshallingContext)
     */
    public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
        YupooResult result = new YupooResult();
        result.setPage(new Integer(reader.getAttribute("page")));
        result.setPages(new Integer(reader.getAttribute("pages")));
        result.setPerpage(new Integer(reader.getAttribute("perpage")));
        result.setTotal(new Integer(reader.getAttribute("total")));
        reader.moveDown();
        List<YupooPhoto> photos = new ArrayList<YupooPhoto>();
        while(reader.hasMoreChildren()) {
            reader.moveDown();
            YupooPhoto photo = new YupooPhoto();
            photo.setDir(reader.getAttribute("dir"));
            photo.setFilename(reader.getAttribute("filename"));
            photo.setHost(reader.getAttribute("host"));
            photo.setId(reader.getAttribute("id"));
            photo.setOwner(reader.getAttribute("owner"));
            photo.setTitle(reader.getAttribute("title"));
            photos.add(photo);
            reader.moveUp();
        }
        result.setPhotos(photos);
        return result;
    }
    /* (non-Javadoc)
     * @see com.thoughtworks.xstream.converters.ConverterMatcher#canConvert(java.lang.Class)
     */
    public boolean canConvert(Class clazz) {
        return clazz.equals(YupooResult.class);
    }
}

然后调用的地方修改一下就ok了。
XStream stream = new XStream();
stream.registerConverter(new YupooResultConverter());
stream.alias("result", YupooResult.class);



参考:
http://xstream.codehaus.org/converter-tutorial.html

2007年1月18日更新。
这里感谢网友 Ivan Chen（西滨）的提示。原来新版的xstream可以简单的解决了。在1.2.1的doc里面找到了这个两个方法。

useAttributeFor

public void useAttributeFor(java.lang.String fieldName,
                            java.lang.Class type)

Use an XML attribute for a field or a specific type.

Parameters:: fieldName - the name of the field; type - the Class of the type to be rendered as XML attribute
Throws:: XStream.InitializationException - if no AttributeMapper is available
Since:: 1.2

useAttributeFor

public void useAttributeFor(java.lang.Class type)

Use an XML attribute for an arbotrary type.

Parameters:: type - the Class of the type to be rendered as XML attribute
Throws:: XStream.InitializationException - if no AttributeMapper is available
Since:: 1.2

这两个方法都是从1.2开始支持的。
也不用自己写converter了。这样就可以了

        stream.alias("result", YupooResult.class);
        stream.useAttributeFor("page", Integer.class);
        stream.useAttributeFor("pages", Integer.class);
        stream.useAttributeFor("perpage", Integer.class);
        stream.useAttributeFor("total", Integer.class);
        stream.alias("photo", YupooPhoto.class);
        stream.useAttributeFor("id", String.class);
        stream.useAttributeFor("owner", String.class);
        stream.useAttributeFor("title", String.class);
        stream.useAttributeFor("host", String.class);
        stream.useAttributeFor("dir", String.class);
        stream.useAttributeFor("filename", String.class);

除经特别注明外,本文章版权归莫多泡泡所有.
署名,非商业用途,保持一致. somebody(莫多)

posted @ 2007-01-17 18:24 莫多阅读(7982) | 评论 (2) | 编辑收藏

又是乱码问题-Filter 配置也很重要

上周更新了一下myblog,添加了一个Filter，做统计访问用。可是后来发现出现乱码问题了。找了很久都没有找到问题。debug的时候看到 CharacterEncodingFilter确实是执行了。不过就是没有效果。执行之前是ISO-8859-1编码的，执行之后还是， CharacterEncodingFilter就没有起到作用。后来终于找到问题的原因了。原来是Filter配置先后顺序的原因。
刚开始的配置是这样的:

     < filter-mapping >
         < filter-name > requestCounterFilter </ filter-name >
         < url-pattern > *.jhtml </ url-pattern >
     </ filter-mapping >

     < filter-mapping >
         < filter-name > encodingFilter </ filter-name >
         < url-pattern > /dwr/* </ url-pattern >
     </ filter-mapping >

     < filter-mapping >
         < filter-name > encodingFilter </ filter-name >
         < url-pattern > *.jhtml </ url-pattern >
     </ filter-mapping >

     < filter-mapping >
         < filter-name > encodingFilter </ filter-name >
         < url-pattern > *.jsp </ url-pattern >
     </ filter-mapping >

先经过那个统计的filter然后再经过编码的filter。这样的话编码的filter就不起作用了。只要吧编码的filter放到最前面就没有问题了。改成这样就好。

     < filter-mapping >
         < filter-name > encodingFilter </ filter-name >
         < url-pattern > /dwr/* </ url-pattern >
     </ filter-mapping >

     < filter-mapping >
         < filter-name > encodingFilter </ filter-name >
         < url-pattern > *.jhtml </ url-pattern >
     </ filter-mapping >

     < filter-mapping >
         < filter-name > encodingFilter </ filter-name >
         < url-pattern > *.jsp </ url-pattern >
     </ filter-mapping >

     < filter-mapping >
         < filter-name > requestCounterFilter </ filter-name >
         < url-pattern > *.jhtml </ url-pattern >
     </ filter-mapping >

以后大家一定要注意啊。顺序问题也是很重要的。
除经特别注明外,本文章版权归莫多泡泡所有.
署名,非商业用途,保持一致. somebody(莫多)

posted @ 2006-12-27 10:37 莫多阅读(2677) | 评论 (3) | 编辑收藏

tuckey urlrewrite 3.x的问题

昨天晚上配置myblog的rewrite。发现一个奇怪的问题。由于现在使用的这个pjblog，为了让搜索引擎收录的连接有效。我想把原来的asp连接rewrite到我的新程序上面。所以有这样一条规则。

    <rule>
        <from>^/article.asp\?id=(.*)$</from>
        <to type="redirect">/entry/$1.jhtml</to>
    </rule>

但是我这样的连接总是匹配不到，只要去掉那个？就可以了。这个正则表达式是没有问题的。/article.asp?id=64是可以匹配的到的。
后来看3.0的manual (http://tuckey.org/urlrewrite/manual/3.0/)才发现原来是这个的问题。

<urlrewrite> element

The top level element.

Attribute	Possible Value	Explanation
default-match-type (optional)	regex (default)	All rules and thier conditions will be processed using the Java Regular Expression engine (unless `match-type` is specified on a rule).
default-match-type (optional)	wildcard	All rules and thier conditions will be processed using the Wildcard Expression engine (unless `match-type` is specified on a rule).
decode-using (optional)	utf8 (default)	When URL is decoded UTF-8 will be used.
	null	Do not decode.
	[encoding]	Any string representing a supported character encoding eg, ISO-8859-1. See Java Charset Object for more info.
use-query-string (optional)	false (default)	The query string will not be appended to the url that the "from" element matches against.
use-query-string (optional)	true	The query string will be appended to the url that the "from" element matches against.
use-context (optional)	false (default)	The context path will not be added to the url that the "from" element matches against.
use-context (optional)	true	The context path will be added to the url that the "from" element matches against.

就是那个use-query-string 的问题，默认的是不使用query-string就是把?后面的都忽略了。所以就不能匹配到了。只要在<urlrewrite>里面加一个属性就可以了。

</urlrewrite>

除经特别注明外,本文章版权归莫多泡泡所有.
署名,非商业用途,保持一致. somebody(莫多)

posted @ 2006-12-12 10:33 莫多阅读(2332) | 评论 (0) | 编辑收藏

SpringXmlrpcServiceExporter for xmlrpc3.x

      我们的项目用到了xmlrpc,不过还是用的2.x版本的。由于xmlrpc3.x地推出。提供了NULL,Serializable等的支持，将原来的Hashtable改成了Map,Vector改成了List。都是不错的进步。所以我们决定从xmlrpc2.x升级到xmlrpc3.x.
      在spring里面有几个ServiceExporter，org.springframework.remoting.rmi.RmiServiceExporter、org.springframework.remoting.caucho.HessianServiceExporter、org.springframework.remoting.caucho.BurlapServiceExporter。不过没有xmlrpc的serviceExporter，原来我们是自己封装的XmlRpcServer,用servlet提供服务。(eg:http://localhost:8080/community/service/xmlrpc)没有和spring集成虽然用了spring。
    考虑到spring的便利以及配置的同意我决定将xmlrpcService放入spring中。xmlrpc3.x和xmlrpc2.x的代码基本上没有一样的。改了很多东西。除了类型变化之外，还添加了对异常的支持。详细信息请参照xmlrpc3.x源代码。
XmlRpcServiceExporter.java

package com.jdkcn.xmlrpc;

import javax.servlet.ServletException;

/**
* @author <a href="mailto:rory.cn@gmail.com">somebody</a>
* @since 2006-9-27 03:59:22 pm
* @version $Id XmlRpcServiceExporter.java$
*/
public class XmlRpcServiceExporter extends RemoteExporter implements
        Controller, InitializingBean {

     private XmlRpcServletServer server;

     public String serviceName;

     public Resource configFile;

     public Boolean enabledForExtensions;

     public void setEnabledForExtensions(Boolean enabledForExtensions) {
         this .enabledForExtensions = enabledForExtensions;
    }

     public void setConfigFile(Resource configFile) {
         this .configFile = configFile;
    }

     public String getServiceName() {
         return serviceName;
    }

     public void setServiceName(String serviceName) {
         this .serviceName = serviceName;
    }

     public XmlRpcServletServer getXmlRpcServletServer() {
         return server;
    }

     /* (non-Javadoc)
     * @see org.springframework.web.servlet.mvc.Controller#handleRequest(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
      */
     public ModelAndView handleRequest(HttpServletRequest request,
            HttpServletResponse response) throws Exception {
         if ( ! WebContentGenerator.METHOD_POST.equals(request.getMethod())) {
             throw new ServletException( " XmlRpcServiceExporter only supports POST requests " );
        }
        server.execute(request, response);
         return null ;
    }

     /* (non-Javadoc)
     * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
      */
     public void afterPropertiesSet() throws Exception {
        server = new XmlRpcServletServer();
        server.setHandlerMapping(newXmlRpcHandlerMapping());
         if (enabledForExtensions != null ) {
            ((XmlRpcServerConfigImpl) server.getConfig()).setEnabledForExtensions(enabledForExtensions.booleanValue());
        }

    }

     /** Creates a new handler mapping. The default implementation loads
     * a property file from the resource
     *
      */
     protected XmlRpcHandlerMapping newXmlRpcHandlerMapping() throws XmlRpcException {

        SpringHandlerMapping mapping = new SpringHandlerMapping(getServiceInterface());
        mapping.addHandler(getServiceName(), getServiceInterface());
        mapping.setTagetObject(getProxyForService());
         return mapping;
    }

}

spring配置文件

</bean>

</property>

<value>jdkcn.accountService</value>

</property>

</property>

<value>com.jdkcn.service.AccountService</value>

</property>

</bean>

然后映射一个地址就可以通过xmlrpc访问服务了

    <bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
        <property name="mappings">
            <props>
                <prop key="/account">rpcAccountService</prop>
            </props>
        </property>
    </bean>

web.xml

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            classpath:spring/global.xml
        </param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

        <servlet>
            <servlet-name>service</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        </servlet>

        <servlet-mapping>
            <servlet-name>service</servlet-name>
            <url-pattern>/service/xmlrpc3/*</url-pattern>
        </servlet-mapping>

然后我们的service地址就是这样的http://localhost:8080/service/xmlrpc3/account

希望对大家有用，这里提供project下载。包含一个client程序。com.jdkcn.xmlrpc.Client

点击下载完整代码

除经特别注明外,本文章版权归莫多泡泡所有.
署名,非商业用途,保持一致. somebody(莫多)

posted @ 2006-10-22 16:12 莫多阅读(2168) | 评论 (0) | 编辑收藏

useAttributeFor

useAttributeFor

<urlrewrite> element

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