我正在开发 CRUD 应用程序，我应该在其中设计多种表单。我正在尝试根据可用示例 here 对应用程序进行建模。 我能够毫无问题地设计第一个表单。但我面临第二种形式的以下错误
type Exception report
message An exception occurred processing JSP page /ctsFrmCaseStage.jsp at line 22
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /ctsFrmCaseStage.jsp at line 22
19: </head>
20: <body>
21: <s:form action="saveOrUpdateCaseStage">
22: <s:push value="casestage">
23: <s:hidden name="ccs_ID" />
24: <s:textfield name="ccs_CaseStageName" label="CaseStage Name" />
25: <s:textfield name="ccs_Description" label="Description" />
root cause
tag 'push', field 'value': You must specify a value to push on the stack. Example: person - [unknown location]
org.apache.struts2.components.Component.fieldError(Component.java:230)
org.apache.struts2.components.Component.findValue(Component.java:351)
org.apache.struts2.components.Push.start(Push.java:128)
org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag(ComponentTagSupp ort.java:53)
我采取了以下步骤来设计此表单 - 1) CaseStage.Java 这是我的域对象 2) CaseStageDAO——接口(interface) 3) CaseStageDAOImpl - 有四种方法来执行各种 CRUD 操作。 4) CaseStageAction - 实现模型驱动接口(interface) 5) ctsFrmCaseStage.jsp - jsp表单 完成此操作后，我还在 hibernate.cfg.xml 映射部分中包含了 CaseStage 类。 我想知道我错过了什么...请注意我对 struts 和 hibernate 世界很陌生。预先非常感谢 以下是按顺序排列的代码
CaseStage.java
package com.tutorials4u.domain;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import java.util.Date;
@Entity
@Table(name = "mcasecategory")
public class CaseStage {
private Long ccs_ID;
private int ccs_StageName, ccs_Description;
@Id
@GeneratedValue
@Column(name = "ccs_ID")
public Long getCcs_ID() {
return ccs_ID;
}
public void setCcs_ID(Long ccs_ID) {
this.ccs_ID = ccs_ID;
}
@Column(name = "ccs_StageName")
public int getCcs_StageName() {
return ccs_StageName;
}
public void setCcs_StageName(int ccs_StageName) {
this.ccs_StageName = ccs_StageName;
}
@Column(name = "ccs_Description")
public int getCcs_Description() {
return ccs_Description;
}
public void setCcs_Description(int ccs_Description) {
this.ccs_Description = ccs_Description;
}
}
CaseStage.DAO
package com.tutorials4u.dao;
import java.util.List;
import com.tutorials4u.domain.CaseStage;
public interface CaseStageDAO {
public List<CaseStage> listCaseStage();
public void saveOrUpdateCaseStage(CaseStage casestage);
public CaseStage listCaseStageById(Long casestageId);
public void deleteCaseStage(Long casestageId);
}
CaseStageDAOImpl.java
package com.tutorials4u.dao;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.Transaction;
import com.googlecode.s2hibernate.struts2.plugin.annotations.SessionTarget;
import com.googlecode.s2hibernate.struts2.plugin.annotations.TransactionTarget;
import com.tutorials4u.domain.CaseStage;
public class CaseStageDAOImpl implements CaseStageDAO {
@SessionTarget
Session session;
@TransactionTarget
Transaction transaction;
/**
* Used to save or update a casestage.
*/
@SuppressWarnings("unchecked")
public List<CaseStage> listCaseStage() {
List<CaseStage> courses = null;
try {
courses = session.createQuery("from CaseStage").list();
} catch (Exception e) {
e.printStackTrace();
}
return courses;
}
public void saveOrUpdateCaseStage(CaseStage casestage) {
try {
session.saveOrUpdate(casestage);
} catch (Exception e) {
transaction.rollback();
e.printStackTrace();
}
}
/**
* Used to delete a user.
*/
public void deleteCaseStage(Long casestageId) {
try {
CaseStage casestage = (CaseStage) session.get(CaseStage.class, casestageId);
session.delete(casestage);
} catch (Exception e) {
transaction.rollback();
e.printStackTrace();
}
}
/**
* Used to list all the users.
*/
/**
* Used to list a single user by Id.
*/
public CaseStage listCaseStageById(Long casestageId) {
CaseStage casestage = null;
try {
casestage = (CaseStage) session.get(CaseStage.class, casestageId);
} catch (Exception e) {
e.printStackTrace();
}
return casestage;
}
}
CaseStageAction.java
package com.tutorials4u.web;
import static com.opensymphony.xwork2.Action.SUCCESS;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.tutorials4u.dao.CaseStageDAO;
import com.tutorials4u.dao.CaseStageDAOImpl;
import com.tutorials4u.domain.CaseStage;
public class CaseStageAction extends ActionSupport implements ModelDriven<CaseStage> {
private static final long serialVersionUID = -6659925652584240539L;
private CaseStage casestage = new CaseStage();
private List<CaseStage> casestageList = new ArrayList<CaseStage>();
private CaseStageDAO casestageDAO = new CaseStageDAOImpl();
public CaseStage getModel() {
return casestage;
}
/**
* To save or update casestage.
* @return String
*/
public String saveOrUpdate()
{
casestageDAO.saveOrUpdateCaseStage(casestage);
return SUCCESS;
}
/**
* To list all categories.
* @return String
*/
public String list()
{
casestageList = casestageDAO.listCaseStage();
return SUCCESS;
}
/**
* To delete a casestage.
* @return String
*/
public String delete()
{
HttpServletRequest request = (HttpServletRequest) ActionContext.getContext().get(ServletActionContext.HTTP_REQUEST);
casestageDAO.deleteCaseStage(Long.parseLong(request.getParameter("ccs_ID")));
return SUCCESS;
}
/**
* To list a single casestage by Id.
* @return String
*/
public String edit()
{
HttpServletRequest request = (HttpServletRequest) ActionContext.getContext().get(ServletActionContext.HTTP_REQUEST);
casestage = casestageDAO.listCaseStageById(Long.parseLong(request.getParameter("ccs_ID")));
return SUCCESS;
}
public CaseStage getCaseStage() {
return casestage;
}
public void setCaseStage(CaseStage casestage) {
this.casestage = casestage;
}
public List<CaseStage> getCaseStageList() {
return casestageList;
}
public void setCaseStageList(List<CaseStage> casestageList) {
this.casestageList = casestageList;
}
}
ctsFrmCaseStage.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib uri="/struts-tags" prefix="s"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Registration Page</title>
<s:head />
<style type="text/css">
@import url(style.css);
</style>
</head>
<body>
<s:form action="saveOrUpdateCaseStage">
<s:push value="casestage">
<s:hidden name="ccs_ID" />
<s:textfield name="ccs_CaseStageName" label="CaseStage Name" />
<s:textfield name="ccs_Description" label="Description" />
<s:submit />
</s:push>
</s:form>
<s:if test="casestageList.size() > 0">
<div class="content">
<table class="userTable" cellpadding="5px">
<tr class="even">
<th>CaseStage Name</th>
<th>Description</th>
</tr>
<s:iterator value="casestageList" status="casestageStatus">
<tr
class="<s:if test="#casestageStatus.odd == true ">odd</s:if> <s:else>even</s:else>">
<td><s:property value="ccs_CaseStageName" /></td>
<td><s:property value="ccs_Description" /></td>
<td><s:url id="editURL" action="editCaseStage">
<s:param name="ccs_ID" value="%{ccs_ID}"></s:param>
</s:url> <s:a href="%{editURL}">Edit</s:a></td>
<td><s:url id="deleteURL" action="deleteCaseStage">
<s:param name="ccs_ID" value="%{ccs_ID}"></s:param>
</s:url> <s:a href="%{deleteURL}">Delete</s:a></td>
</tr>
</s:iterator>
</table>
</div>
</s:if>
</body>
</html>
类别.java
package com.tutorials4u.domain;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import java.util.Date;
@Entity
@Table(name = "cts_mcasecategory")
public class Category {
private Long ccg_ID;
private int ccg_CreateUser, ccg_ModifyUser;
private String ccg_CategoryName;
private String ccg_Description;
private Date ccg_CreateDate, ccg_ModifyDate;
private boolean ccg_DeleteFlag, ccg_ActiveFlag;
@Id
@GeneratedValue
@Column(name = "ccg_ID")
public Long getCcg_ID() {
return ccg_ID;
}
public void setCcg_ID(Long ccg_ID) {
this.ccg_ID = ccg_ID;
}
@Column(name = "ccg_CategoryName")
public String getCcg_CategoryName() {
return ccg_CategoryName;
}
public void setCcg_CategoryName(String ccg_CategoryName) {
this.ccg_CategoryName = ccg_CategoryName;
}
@Column(name = "ccg_Description")
public String getCcg_Description() {
return ccg_Description;
}
public void setCcg_Description(String ccg_Description) {
this.ccg_Description = ccg_Description;
}
@Column(name = "ccg_CreateUser")
public int getCcg_CreateUser() {
return ccg_CreateUser;
}
public void setCcg_CreateUser(int ccg_CreateUser) {
this.ccg_CreateUser = ccg_CreateUser;
}
@Column(name = "ccg_ModifyUser")
public int getCcg_ModifyUser() {
return ccg_ModifyUser;
}
public void setCcg_ModifyUser(int ccg_ModifyUser) {
this.ccg_ModifyUser = ccg_ModifyUser;
}
@Column(name = "ccg_CreateDate")
public Date getCcg_CreateDate() {
return ccg_CreateDate;
}
public void setCcg_CreateDate(Date ccg_CreateDate) {
this.ccg_CreateDate = ccg_CreateDate;
}
@Column(name = "ccg_ModifyDate")
public Date getCcg_ModifyDate() {
return ccg_ModifyDate;
}
public void setCcg_ModifyDate(Date ccg_ModifyDate) {
this.ccg_ModifyDate = ccg_ModifyDate;
}
@Column(name = "ccg_DeleteFlag")
public boolean isCcg_DeleteFlag() {
return ccg_DeleteFlag;
}
public void setCcg_DeleteFlag(boolean ccg_DeleteFlag) {
this.ccg_DeleteFlag = ccg_DeleteFlag;
}
@Column(name = "ccg_ActiveFlag")
public boolean isCcg_ActiveFlag() {
return ccg_ActiveFlag;
}
public void setCcg_ActiveFlag(boolean ccg_ActiveFlag) {
this.ccg_ActiveFlag = ccg_ActiveFlag;
}
}
hibernate 配置
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/case_tracking_system </property>
<property name="hibernate.connection.username">root</property>
<property name="connection.password">nvj@123</property>
<property name="connection.pool_size">1</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">create</property>
<mapping class="com.tutorials4u.domain.User"/>
<mapping class="com.tutorials4u.domain.Category"/>
<mapping class="com.tutorials4u.domain.CaseStage"/>
</session-factory>
</hibernate-configuration>
Struts.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/case_tracking_system </property>
<property name="hibernate.connection.username">root</property>
<property name="connection.password">nvj@123</property>
<property name="connection.pool_size">1</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">create</property>
<mapping class="com.tutorials4u.domain.User"/>
<mapping class="com.tutorials4u.domain.Category"/>
<mapping class="com.tutorials4u.domain.CaseStage"/>
</session-factory>
</hibernate-configuration>
最佳答案
Struts 2 “push” tag is used to push value to the top of stack, so that it can be access or reference easily
您将遇到以下原因导致的错误:
tag 'push', field 'value': You must specify a value to push on the stack. Example: person - [unknown location]
解决方案:
您可以在 <s:form 之前的 ctsFrmCaseStage.jsp 页面中添加一个 bean(以指定要压入堆栈的值)像这样的标签:
<body>
<s:bean name="com.tutorials4u.domain.CaseStage" var="casestage" />
<s:form action="saveOrUpdateCaseStage">
<s:push value="casestage">
注意:
Struts 2 “bean” tag is used to instantiate a class in the JSP page.
关于java - CRUD 应用程序中推送值错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34089285/