如何使用Struts 2和Hibernate维护会话? [英] How to maintain the session using Struts 2 and Hibernate?
问题描述
我需要知道如何使用Struts2维护一个表单和多个输入[名称，城市，国家/地区] 的会话，最后数据将使用Hibernate存储到数据库中.
I need to know how to maintain session for one form and multiple input [Name, City, Country] using Struts2 and finally data will stored to database using Hibernate.
此表单有两个按钮:
-
添加(存储到会话)； -
提交(存储到数据库).
add(stored to session);Submit(stored to database).
首先，输入表单详细信息名称，城市和国家/地区，然后单击添加按钮数据将存储到 session .
First, enter the form details Name, City and Country and click add button data will store to session.
第二，输入相同的详细信息，然后单击添加.
Second, enter the details for same and now click add.
第三，输入相同的表单详细信息，但是现在单击提交按钮，所有详细信息(第一，第二和第三)将使用Hibernate存储到数据库中.
Third, enter same form details but now click submit button all details (first second & third) will stored to database using Hibernate.
遇到错误，我们的代码是:
Person.java :
Person.java :
@Entity
public class Person {
@Id
@GeneratedValue
private int id;
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
PersonAction.java :
PersonAction.java:
public class PersonAction extends ActionSupport implements SessionAware {
private Person person = new Person();
// Database base=new Database();
public Person getPerson() {
return person;
}
public void setPerson(Person person){
this.person = person;
}
private Map<String, Object> session;
public void setSession(Map<String, Object> session){
this.session = session;
}
public String execute() { //Create persons
List<Person> personList = (List<Person>) session.get("personList");
for (Person p : personList)
Database.saveData(this);
personList.clear();
return SUCCESS;
}
public String add() { //Add person
List<Person> personList = (List<Person>) session.get("personList");
if (personList == null) {
personList = new ArrayList<Person>();
session.put("personList", personList);
System.out.println("Successfully added");
}
personList.add(person);
return SUCCESS;
}
}
Database.java :
Database.java:
public class Database {
public static int saveData(PersonAction personAction){
SessionFactory sf=new AnnotationConfiguration().configure().buildSessionFactory();
Session session=sf.openSession();
Transaction tran=session.beginTransaction();
int i=(Integer)session.save(personAction);
tran.commit();
session.close();
return i;
}
}
struts.xml :
struts.xml:
<struts>
<package name="default" extends="struts-default">
<action name="person" class="org.PersonAction">
<result>/person.jsp</result>
</action>
<action name="person" class="org.PersonAction" method="add">
<result>/person.jsp</result>
</action>
</package>
</struts>
index.jsp :
index.jsp:
<s:form action="person">
<s:textfield label="Enter your name" name="name"/>
<s:submit value="Add person" method="add"/>
<s:submit value="Create persons"/>
</s:form>
person.jsp :
person.jsp:
<body>
<s:property value="#session.name"/>
</body>
推荐答案
您应将按钮映射到实际使用的方法.默认的动作映射器允许使用按钮名称或方法属性，用于指定表单映射所使用的方法以外的方法.例如
You should map the buttons to the method in action. The default action mapper allows to use button names or method attribute to specify the method other than used by the form mapping. For example
<s:form action="person">
<s:textfield label="Enter your name" name="person.name"/>
<s:submit value="Add person" method="add"/>
<s:submit value="Create persons"/>
</s:form>
Now, in the action you implement SessionAware
public class PersonAction extends ActionSupport implements SessionAware {
private Person person = new Person();
public Person getPerson() {
return person;
}
public setPerson(Person person){
this.person = person;
}
private Map<String, Object> session;
public setSession(Map<String, Object> session){
this.session = session;
}
public String execute() { //Create persons
List<Person> personList = (List<Person>) session.get("personList");
for (Person p : personList)
getPersonService().save(p); // save to db
//clear the list
personList.clear();
return SUCCESS;
}
public String add() { //Add person
List<Person> personList = (List<Person>) session.get("personList");
if (personList == null) {
personList = new ArrayList<Person>();
session.put("personList", personList);
}
personList.add(person);
return SUCCESS;
}
}
现在，您已经通过映射到相应按钮的方法来分离逻辑.为了确保工作正常，请确保您具有 DMI(动态方法调用))(默认情况下处于打开状态)和拦截器堆栈 defaultStack 应用于操作配置(默认情况下使用).
Now, you have separated logic via methods mapped to a corresponding button. To make working be sure you have DMI (Dynamic Method Invocation) turned on (by default is on) and interceptors stack defaultStack is applied to the action config (by default it's used).
struts.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<constant name="struts.devMode" value="false"/>
<package name="default" extends="struts-default">
<action name="person" class="PersonAction">
<result>/person.jsp</result>
</action>
</package>
</struts>
SessionAware 是一个接口，您要使用servlet会话将其放入对象时，该接口应由您的操作或基本操作实现.此处.
SessionAware is a interface that your action or base action should implement if you want to use servlet session to put into your objects. More about it here.
ActionContext 是操作调用的容器占位符，更详细的解释是
ActionContext is a container placeholder for the action invocation, more detailed explanation is here.
这篇关于如何使用Struts 2和Hibernate维护会话?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
