我无法插入其显示的值，无法在命名空间'/ null'
中实例化操作我的pojo类，我声明变量的模型并创建表
package com.konzern.pojo;
import java.io.Serializable;
import javax.persistence.*;
@Entity
@Table(name = "register")
public class Register implements Serializable {
@Id @GeneratedValue (strategy=GenerationType.AUTO)
@Column(name = "UserId")
private int UserId;
@Column(name = "UserName")
private String UserName;
@Column(name = "Designation")
private String Designation;
@Column(name = "DOJ")
private String DOJ;
@Column(name = "DOB")
private String DOB;
@Column(name = "Address")
private String Address;
@Column(name = "Phone")
private String Phone;
@Column(name = "Blood")
private String Blood;
@Column(name = "Email")
private String Email;
@Column(name = "EmpPassword")
private String EmpPassword;
public int getUserId() {
return UserId;
}
public void setUserId(int userId) {
UserId = userId;
}
public String getUserName() {
return UserName;
}
public void setUserName(String userName) {
UserName = userName;
}
public String getDesignation() {
return Designation;
}
public void setDesignation(String designation) {
Designation = designation;
}
public String getDOJ() {
return DOJ;
}
public void setDOJ(String dOJ) {
DOJ = dOJ;
}
public String getDOB() {
return DOB;
}
public void setDOB(String dOB) {
DOB = dOB;
}
public String getAddress() {
return Address;
}
public void setAddress(String address) {
Address = address;
}
public String getPhone() {
return Phone;
}
public void setPhone(String phone) {
Phone = phone;
}
public String getBlood() {
return Blood;
}
public void setBlood(String blood) {
Blood = blood;
}
public String getEmail() {
return Email;
}
public void setEmail(String email) {
Email = email;
}
public String getEmpPassword() {
return EmpPassword;
}
public void setEmpPassword(String empPassword) {
EmpPassword = empPassword;
}
}
controller类，我从jsp页面获取值
package com.konzern.controller;
import java.net.URL;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.mapping.Map;
import com.konzern.operations.RegisterOperations;
import com.konzern.pojo.Login;
import com.konzern.pojo.Register;
import com.opensymphony.xwork2.ActionSupport;
public class RegisterController extends ActionSupport implements ServletRequestAware,ApplicationAware {
private static final long serialVersionUID = 1L;
RegisterOperations ro=new RegisterOperations();
Register r;
public Register getR(){
return r;
}
public void setR(Register r){
this.r=r;
}
Login l;
public Login getL() {
return l;
}
public void setL(Login l) {
this.l = l;
}
HttpServletRequest request;
public void setServletRequest(HttpServletRequest request) {
// TODO Auto-generated method stub
this.request=request;
}
public HttpServletRequest getServletRequest() {
return request;
}
Map m;
public void setApplication(Map m)
{
this.m=m;
}
public String insertaction(){
System.out.println("hhhhhh");
ro.registration(r);
ro.insert(l);
return SUCCESS;
}
/* public String tolog(){
System.out.println("hhhhhh");
ro.insert(l);
return SUCCESS;
}*/
@Override
public void setApplication(java.util.Map<String, Object> arg0) {
// TODO Auto-generated method stub
}
struts.xml中
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<include file="struts-default.xml"/>
<constant name="struts.custom.i18n.resources"
value="ApplicationResources" />
<package name="a" extends="struts-default">
<!-- <interceptors>
<interceptor class="com.konzern.loginInterceptor" name="loginInterceptor"/>
<interceptor-stack name="loginStack">
<interceptor-ref name="loginInterceptor"/>
<interceptor-ref name="defaultStack"/>
</interceptor-stack>
</interceptors> -->
<!-- <default-interceptor-ref name="loginStack"/>
<global-results>
<result name="login">/login.jsp</result>
</global-results> -->
<action name="verify" class="com.konzern.controller.LoginController" method="LoginAction">
<result name="success">/Newlogin.jsp</result>
</action>
<action name="login" class="com.konzern.controller.LoginController" method="indexAction">
<result name="success">/Admin.jsp</result>
<result name="login">/User.jsp</result>
<result name="error">/Newlogin.jsp</result>
</action>
<action name="logout" class="com.konzern.controller.LoginController" method="logoutAction">
<result name="success">/Newlogin.jsp</result>
</action>
<action name="myjobs" class="com.konzern.controller.LoginController" method="LoginAction">
<result name="success">/Attendance.jsp</result>
</action>
<action name="Register" class="com.konzern.controller.RegisterController" method="insertaction">
<result name="success">/Newlogin.jsp</result>
</action>
</package>
</struts>
stack trace:
输入例外报告
message Unable to instantiate Action, com.konzern.controller.RegisterController, defined for 'Register' in namespace '/'null
description The server encountered an internal error that prevented it from fulfilling this request.
exception
Unable to instantiate Action, com.konzern.controller.RegisterController, defined for 'Register' in namespace '/'null
com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:316)
com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:397)
com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:194)
org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:37)
com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:552)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:434)
root cause
java.lang.NullPointerException
com.konzern.operations.RegisterOperations.<init>(RegisterOperations.java:17)
com.konzern.controller.RegisterController.<init>(RegisterController.java:27)
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
java.lang.reflect.Constructor.newInstance(Unknown Source)
java.lang.Class.newInstance0(Unknown Source)
java.lang.Class.newInstance(Unknown Source)
com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:151)
com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:182)
com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:171)
com.opensymphony.xwork2.factory.DefaultActionFactory.buildAction(DefaultActionFactory.java:22)
com.opensymphony.xwork2.ObjectFactory.buildAction(ObjectFactory.java:141)
com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:297)
com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:397)
com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:194)
org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:37)
com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:552)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:434)
的login.jsp
> <%@ taglib prefix="s" uri="/struts-tags" %> <%@ page
> import="java.util.*;" %>
>
> <html>
>
> <head> <meta charset="utf-8"> <title>Konzern</title> <link
> href="style/css.css" rel="stylesheet" type="text/css"> </head>
>
> <body> <div class="header_full">
> <div class="header">
> <div class="Logo_holder"></div>
> </div> </div> <!--HEADER ENDS HERE-->
>
> <div class="current_username_full"> <div
> class="current_username_holder">Log In</div> </div>
>
> <!--USERNAME ENDS HERE-->
>
> <div class="options_holder_full"> <div class="options_holder">
> <div class="log_in_holder">
> <div class="ADMIN_login">
> <s:form action="login">
> <h1>Log in here</h1>
> <label></label>
>
> <s:textfield label="Username" name="b.userid" cssClass="inputforlogin"/>
> <br></br>
> <s:password label="Password" name="b.password" cssClass="inputforlogin"/>
>
> <s:submit value="login" cssClass="button" />
>
>
> </s:form>
> <p style="float:left; margin-top:2px; margin-left:120px;"><a href="Register.jsp">Register here</a></p>
> </div>
> </div>
> </div> </div> <!--OPTIONS_HOLDER_FULL-->
>
> <div class="footer_full"></div>
>
>
> </body> </html>
register.jsp
<%@ taglib prefix="s" uri="/struts-tags" %> <%@ page
> import="java.util.*;" %> <html> <head> <meta charset="utf-8">
> <title>Konzern</title> <link href="style/css.css" rel="stylesheet"
> type="text/css"> </head>
>
> <body> <div class="header_full">
> <div class="header">
> <div class="Logo_holder"></div>
> </div> </div> <!--HEADER ENDS HERE-->
>
>
>
>
>
> <div class="current_username_full"> <div
> class="current_username_holder">Register new user</div> </div>
>
> <!--USERNAME ENDS HERE-->
>
>
>
> <div class="options_holder_full"> <div class="options_holder">
> <div class="register_holder">
> <div class="register">
> <h1>Register here</h1>
> <s:form action="Register">
>
> <s:textfield name="r.UserName" label="Name" cssClass="input"/>
> <s:textfield name="r.Designation" label="Designation" cssClass="input"/>
> <s:textfield name="r.DOJ" label="Date of Join" cssClass="input"/>
> <s:textfield name="r.DOB" label="Date of Birth/Age" cssClass="input"/>
> <s:textarea name="r.Address" label="Address" cssClass="textarea"/>
> <s:textfield name="r.Phone" label="Mobile Number" cssClass="input"/>
> <s:textfield name="r.Blood" label="Blood Group" cssClass="input"/>
> <s:textfield name="r.Email" label="E-mail" cssClass="input"/>
> <s:textfield name="r.EmpPassword" label="Password" cssClass="input"/>
>
> <s:submit value="Register" cssClass="button" />
>
> </s:form>
>
>
> </div>
>
> </div>
> </div> </div> <!--OPTIONS_HOLDER_FULL-->
>
> <div class="footer_full"></div>
>
>
> </body> </html>
答案 0 :(得分：0)
我认为问题在于registercontroller类，因为它在该类中显示异常。
更改您的类以实现如下所示的模型驱动界面。
public class RegisterController extends ActionSupport implements ServletRequestAware,ApplicationAware,ModelDriven{}
并在课程的第一行初始化如下所示的寄存器类。
Register r = new Register();
然后最终在你的类中实现getModel方法，如
public Object getModel() {
return r;
}