郁闷了，用hibernate查询出一个集合，里面装的是object 类型的数据，转换实体类型报错，应该怎么转呢？

答案:4 悬赏:20 手机版

解决时间 2021-02-05 20:28

提问者网友：欲望失宠
2021-02-05 12:26

严重: Servlet.service() for servlet action threw exception
java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to entity1.QrPreferentialChange
at struts.action.PrAction.getList(PrAction.java:61)
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.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:269)
at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:170)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at filter.filter.doFilter(filter.java:29)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Thread.java:619)

最佳答案

五星知识达人网友：痴妹与他
2021-02-05 12:58

假设 List papers = dao.select(); 查出是一个object类型转法如下.楼主可以参考一下
for (int i = 0; i < papers.size(); i++) {
Object[] objs = (Object[]) papers.get(i);
for (int j = 0; j < objs.length; j++) {
if (objs[j] instanceof Paper) {
return (Paper) objs[j];
}
}
}

全部回答

1楼网友：鸽屿
2021-02-05 14:45

你好请问你是怎样解决这个问题的？

2楼网友：零点过十分
2021-02-05 13:26

用接口了没？再看看别人怎么说的。

3楼网友：夜风逐马
2021-02-05 13:19

List stockList = this.getHibernateTemplate().find("select s from Stock s, Products p where s.userinfo.username='"+args[4]+"' and p.id="+args[0]+" and s.products.id=p.id "); (Stock)stockList.get(0); 类似这个的这么转一下呢我也出现问题但是最后这样是好的自己也不清楚怎么好的

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