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今天在取数据库记录时，使用了BeanUtils的DynaBean,出现错误的主要代码如下：
ResultSet rs=DbCRUD.Select(sql); List--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------dynaBeanList= (new RowSetDynaClass(rs)).getRows(); System.out.println("dynaBeanList.size()="+dynaBeanList.size()); if(dynaBeanList.size()<1) { return null; } System.out.println("该用户名已被注册:"+name); User user=(User)dynaBeanList.get(0); //就是这行出错
错误信息如下：
java.lang.ClassCastException: org.apache.commons.beanutils.BasicDynaBean cannot be cast to bean.User at bean.dao.UserDAO.selectUserByName(UserDAO.java:78) at bean.dao.UserDAO.myTest(UserDAO.java:22) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) 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.runNotIgnored(BlockJUnit4ClassRunner.java:79) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49) 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)
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将代码修改如下，错误即可解决：
ResultSet rs=DbCRUD.Select(sql); List----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------dynaBeanList= (new RowSetDynaClass(rs)).getRows(); System.out.println("dynaBeanList.size()="+dynaBeanList.size()); if(dynaBeanList.size()<1) { return null; } System.out.println("该用户名已被注册:"+name); User user=new User(); BeanUtils.copyProperties(user, dynaBeanList.get(0));
您的十分满意是我追求的宗旨。
您的一点建议是我后续的动力。
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