关于html:checkbox传输数组问题

Question

<logic:present name="adminpurview" scope="request">
<logic:iterate id="purview" name="adminpurview" scope="request">
${purview.purviewname}<html:checkbox property="purview" value="${purview.id}"></html:checkbox>
</logic:iterate>
</logic:present>
以上代码解析成html是
列表<input type="checkbox" name="purview" value="1">

增删<input type="checkbox" name="purview" value="2">

查看<input type="checkbox" name="purview" value="3">使用System.out.println(powerForm.getPurview()); 获取不了数组。
比如选择了 列表，察看  产生的数组应该是1,3  可是通过System.out.println(powerForm.getPurview());  输出的则是3若在php或者asp中，checkbox同名的传输过来应该自动成为数组，可为何现在这样？

Answer 1

补充一下：SSH系统Adminpower.hbm.xml 中   
        <property name="purview" type="java.lang.String">
            <column name="purview" length="65535" />
        </property>AdminpowerForm 中
private String[] purview;

Answer 2

补充二：
传输过来肯定是数组action中通过如下
String[] names = adminpowerForm.getPurview();
int sum=names.length;   for(int i=0;i<sum;i++){
System.out.println("[");
System.out.println(sum+"-"+i);
System.out.println("]");
System.out.println(names[i]);
}
可以确定没问题。
可是通过hibernate保存的时候会出现问题。
执行倒
adminpower.setGradename(adminpowerForm.getGradename());
adminpower.setPurview(names);
this.iadminpowerdao.insert(adminpower);则出现错误。错误如下：[Ljava.lang.String;@783859
java.lang.ClassCastException: [Ljava.lang.String; cannot be cast to java.lang.String
at org.hibernate.type.StringType.set(StringType.java:24)
at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:62)
at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:39)
at org.hibernate.persister.entity.BasicEntityPersister.dehydrate(BasicEntityPersister.java:1617)
at org.hibernate.persister.entity.BasicEntityPersister.dehydrate(BasicEntityPersister.java:1594)
at org.hibernate.persister.entity.BasicEntityPersister.insert(BasicEntityPersister.java:1741)
at org.hibernate.persister.entity.BasicEntityPersister.insert(BasicEntityPersister.java:2178)
at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:34)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:239)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:240)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:160)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:95)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:184)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:173)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:69)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:481)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:476)
at com.py.dao.impl.IAdminpowerDAOImpl.insert(IAdminpowerDAOImpl.java:14)
at com.py.struts.action.AdminpowerAction.insert(AdminpowerAction.java:77)
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:274)
at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:194)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at com.py.filter.EncodingFilter.doFilter(EncodingFilter.java:23)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:619)

Answer 3

java.lang.ClassCastException: [Ljava.lang.String; cannot be cast to java.lang.String 很明显,前台传过来的是String数组,不能强转为String,你手动处理一下就ok了!

Answer 4

手动处理 adminpower.setPurview(names.toString());写入数据库的是[Ljava.lang.String;@a14fed这个阿。不是我想要的数组！请问怎么弄？

Answer 5

在总结一下问题。精简的。SSH系统中如何取得复选匡数组，保存。一个简单问题。选择如下三个复选匡
第一<input type="checkbox" name="purview" value="1">

第二<input type="checkbox" name="purview" value="2">

第三<input type="checkbox" name="purview" value="3">
action中
String[] names = (String[]) adminpowerForm.getPurview();
System.out.println(names);  //输出的是Ljava.lang.String;@2a4640,并不是我想要的数组1,2,3  所以保存进去，怎么保存成1，2，3？
adminpower.setPurview(names.toString());
this.iadminpowerdao.insert(adminpower);

Answer 6

你把String[]赋值给了domain对象的String字段，肯定报错！！
adminpower.setPurview(list2str(names)); 
list2str自己去写就行了

Answer 7

ist2str(names); 是否是遍历？？赫赫。还没适应。asp中，传来之后直接就是1,2,3.