struts中的ajax配置有关问题

2013-08-06

struts中的ajax配置问题在struts.xml中配置了一个package，extendsjson-default,显示unknown tag,重启了

struts中的ajax配置问题
在struts.xml中配置了一个package，extends="json-default",显示unknown tag,重启了tomcat,就报错,,
报错如下，，想问一下，要让struts返回json 数据，应该怎么配置，请详细点..感激不尽

严重: Dispatcher initialization failed
Unable to load configuration. - [unknown location]
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:70)
at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:429)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:473)
at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:281)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:262)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:107)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4746)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5399)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1114)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1672)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: Parent package is not defined: json-default - [unknown location]
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.buildPackageContext(XmlConfigurationProvider.java:661)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:510)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:292)
at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:112)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:250)

at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:67)
... 21 more
2013-7-31 10:16:54 org.apache.catalina.core.StandardContext filterStart
严重: Exception starting filter struts2
Unable to load configuration. - [unknown location]
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:485)
at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:281)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:262)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:107)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4746)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5399)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1114)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1672)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: Unable to load configuration. - [unknown location]
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:70)
at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:429)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:473)
... 19 more
Caused by: Parent package is not defined: json-default - [unknown location]
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.buildPackageContext(XmlConfigurationProvider.java:661)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:510)

at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:292)
at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:112)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:250)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:67)
... 21 more

Struts Ajax Java 配置
[解决办法]
完全可以百度谷歌找找的。比如在http://blog.sina.com.cn/s/blog_7357a29c0100u38p.html 就有描写。摘抄一部分，未验证，楼主自己验证下。
Struts.xml
<package name="default" extends ="json-default" >
<action name="fieldManage_*" method="{1}" lass="fieldManageAction">
        <result type="json">
            <param name="includeProperties">totalCount,data.*</param>
        </result>
        <result name="operaFieldmanage" type="json">
            <param name="includeProperties">success</param>
        </result>
        </action>
</package>
extends=”json-default”这边必须这样设置才能处理json。
1.<action name="test" class="com.TestAction" method="test">
  <result type="json" />
  </action>
2.只要继承extends="json-default"，json拦截器是默认配置上的，可以不配。result设置成json之后，容器会把action的属性自动封装到一个json对象中（json拦截器来做），然后调用js的callback方法. 返回json数据
3.如果按照1中的配置。你会发现前台返回的json字符串，是把action中的所有属性全部转化为json字符串返回给浏览器了（甚至有时候返回不了结果，也不报错，后台执行了，但前台执行不到callback function），但是我们有时候需要根据实际情况返回部分结果，如何对json的结果进行定制输出呢？result提供了一些参数替你解决这个问题，一般情况下用的最多的就是includeProperties 参数和excludeNullProperties参数。当然还有其他的方法，如给pojo的属性加json注解。
4.includeProperties 参数：输出结果中需要包含的属性值，这里正则表达式和属性名匹配，可以用“,”分割填充多个正则表达式。这个参数直接返回对象的json数据，前台不需要eval转换，<param name="root">result</param>则不同，需要前台进行eval转换

5.excludeProperties 参数：输出结果需要剔除的属性值，也支持正则表达式匹配属性名，可以用“,”分割填充多个正则表达式，类同includeProperties
6.对一些属性的特殊处理可在action代码中去特殊的序列化，如：
[6.1]默认情况下以get方法开头的都会序列化,如果不想序列化,在action中的方法要打上注解
@JSON(serialize=false)

[6.2]如果在属性get方法上面加@JSON(name="newName"),则返回的json数据中名称是指定的新名称

[6.3]@JSON(format ="yyyy-MM-dd'T'HH:mm:ss")设置用于格式化输出、解析日期表单域的格式。

[6.4]@JSON(deserialize=true)设置是否反序列化该属性
[解决办法]
把配置文件贴上来看看
有没有引入struts-json-plugin.jar
[解决办法]
4楼正解，你没有引struts2-json-plugin.jar
[解决办法]

js中alert(data)可以显示出（object,object)，可是后面 var list=data.lesson,就不能执行了，为什么？？弄了好久没弄出来..

按F12打开浏览器的开发者模式查看你服务端响应的数据是不是json还是程序抛异常了

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struts中的ajax配置有关问题