org.apache.commons.beanutils.BasicDynaBean cannot be cast to …



org.apache.commons.beanutils.BasicDynaBean cannot be cast to …

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：

 

  1.                      ResultSet rs=DbCRUD.Select(sql);
  2. List<DynaBean> dynaBeanList= (new RowSetDynaClass(rs)).getRows();
  3. System.out.println(“dynaBeanList.size()=”+dynaBeanList.size());
  5. if(dynaBeanList.size()<1)
  6. {
  7.     return null;
  8. }
  10. System.out.println(“该用户名已被注册:”+name);
  11. User user=(User)dynaBeanList.get(0); //就是这行出错

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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)

————————————————————————————————————————————————————————–


将代码修改如下，错误即可解决：

 

  1.                      ResultSet rs=DbCRUD.Select(sql);
  2. List<DynaBean> dynaBeanList= (new RowSetDynaClass(rs)).getRows();
  3. System.out.println(“dynaBeanList.size()=”+dynaBeanList.size());
  5. if(dynaBeanList.size()<1)
  6. {
  7.     return null;
  8. }
  10. System.out.println(“该用户名已被注册:”+name);
  12. User user=new User();
  13. BeanUtils.copyProperties(user, dynaBeanList.get(0));

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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。