在线等，，急~~~

Question

form :<form-bean name="studentForm" type="org.apache.struts.validator.DynaValidatorActionForm">
<form-property name="studentID" type="java.lang.Integer" />
action:
public ActionForward insert(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
DynaValidatorActionForm studentForm = (DynaValidatorActionForm) form;
Student student = new Student();
student.setStudentID((Integer)studentForm.get("studentID"));
DAOImpl:
public void insert(Student student) throws Exception {
super.getHibernateTemplate().save(student);
}
验证：
<field property="studentID" depends="required,integer">
<arg key="err.studentID" resource="true" />
</field>
报错：
exception javax.servlet.ServletException: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:535)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:433)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
sunshine.toni.filter.EncodingFilter.doFilter(EncodingFilter.java:23)
root cause java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
org.apache.struts.action.DynaActionForm.getString(DynaActionForm.java:306)
sunshine.toni.struts.action.StudentAction.insert(StudentAction.java:90)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:270)
org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:187)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
sunshine.toni.filter.EncodingFilter.doFilter(EncodingFilter.java:23)在线等，，急谁帮忙看下？？？

Answer 1

student.setStudentID((Integer)studentForm.get("studentID")); 
这里转换出了问题吧...,你再查查.

Answer 2

我也知道是转换问题，可是我另外一个表单也是这样写的，却可以。。我曾经把form中的studentID属性改成string的，可以拉，，可是确不能验证整数了

Answer 3

你form中类型是 int ,这里似乎不用转吧(Integer)studentForm.get("studentID"); 

Answer 4

错误我自己找到了，上面的都没有错误，是另外一个地方错了。。studentForm.get("studentID");转出来的是object ,所以要在强制转换Integer类型。。

Answer 5

java.lang.Integer cannot be cast to java.lang.String 
用int s=Integer.parseInt(String)

Answer 6

错误提示很清楚.转型出错..
java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String 
Form配置成java.lang.String
student.setStudentID(Integer.parseInt(studentForm.get("studentID")));