求大神解决SSH2中entity输出json问题

hcjlovejay 2014-04-08 10:12:15

我的项目是用SSH2的，前台是Extjs4，其中entity是用hibernate4的annotation写的，现在我想把他用json输出到前台，如果我用

JSON json = JSONObject.fromObject(asset);

直接输出的话，这个原因我已经知道。各位大神能提供一下思路吗？用annotation的entity应该如何输出json。
我也试过一个方法，用org.springframework.beans.BeanUtils，entity的类是Asset，bean的类是AssetBean，
在AssetServiceImpl中

BeanUtils.copyProperties(asset, assetbean);

这个时候就会报错。

org.springframework.beans.FatalBeanException: Could not copy properties from source to target; nested exception is java.lang.IllegalArgumentException: argument type mismatch

	at org.springframework.beans.BeanUtils.copyProperties(BeanUtils.java:620)

	at org.springframework.beans.BeanUtils.copyProperties(BeanUtils.java:530)

	at com.hrmsys.test.Junit_Asset.getAsset(Junit_Asset.java:39)

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

	at java.lang.reflect.Method.invoke(Unknown Source)

	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)

	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)

	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)

	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)

	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)

	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)

	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)

	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)

	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)

	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)

	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)

	at org.junit.runners.ParentRunner.run(ParentRunner.java:236)

	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)

	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)

	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)

	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)

	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

Caused by: java.lang.IllegalArgumentException: argument type mismatch

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

	at java.lang.reflect.Method.invoke(Unknown Source)

	at org.springframework.beans.BeanUtils.copyProperties(BeanUtils.java:617)

	... 24 more

我在web.xml也已经设置了

<filter>

		<filter-name>openSessionInViewFilter</filter-name>

		<filter-class>org.springframework.orm.hibernate4.support.OpenSessionInViewFilter</filter-class>

		<init-param>

			<param-name>singleSession</param-name>

			<param-value>true</param-value>

		</init-param>

		<init-param>

			<param-name>sessionFactoryBeanName</param-name>

			<param-value>sessionFactory</param-value>

		</init-param>

		<init-param>

			<param-name>flushMode</param-name>

			<param-value>AUTO</param-value>

		</init-param>

	</filter>

求大神指导！！

...全文