我用structs2和hibernate3写的小程序总是出错！

nishizhua33 2009-06-09 01:59:56
我用structs2和hibernate3写的小程序总是出错！

我快崩溃来了，都不知道哪出错了，大家帮帮我吧！


这个程序就只有两个jsp页面，一个是添加书名到数据库中，一个是查看书名。

我把源程序放上来了，大家一定要帮我看看啊！

我急等！

index.jsp



<%@ page language="java" contentType="text/html; charset=GB2312"%>

<%@ taglib prefix="s" uri="/struts-tags"%>

<html>

	<body>

		<center>

			输入要添加的书名：

			<s:form action="add.action">

				<s:textfield name="bookname" />

				<s:submit value="确定" />

			</s:form>

		</center>

	</body>

</html>


success.jsp


<%@ page language="java" contentType="text/html; charset=GB2312"%>

<%@ taglib prefix="s" uri="/struts-tags"%>

<html>

	<body>

		<center>

			已插入书名列表：

			<br>

			<table border="1">

				<s:iterator value="list">

					<tr>

						<td>

							<s:property value="bookname" />

						</td>

					</tr>

				</s:iterator>

			</table>

		</center>

	</body>

</html>


然后是 java代码 文件夹的目录结构是：

...全文
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女女321 2009-06-12
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public String addBook() {
Book book = new Book();
book.setBookname(bookname); System.out.println(bookname);
service.add(book);

return SUCCESS;
}
应该是：
public String addBook() {
Book book = new Book();
book.setBookname(this.getBookname());
System.out.println(bookname);
service.add(book);

return SUCCESS;
}
nishizhua33 2009-06-10
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问题还是没解决 谁来救救我啊!
jklot66 2009-06-10
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session这个地方为空，这个congfig不能通过new得来的 要通过加载文件hibernate文件后获得呀
baishengjie 2009-06-10
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学习！
huangjingying121566 2009-06-10
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楼主，建议你看一下BookServiceHibernateImpl.java:27 ，调试看一下到底是什么抛空指针异常
nishizhua33 2009-06-09
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这个hibernate配置文件位置怎么写啊？
zidasine 2009-06-09
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try {
Configuration config = new Configuration();
config.addClass(Book.class);
sessionFactory = config.buildSessionFactory();
} catch (Exception e) {
e.printStackTrace();
}
这里的问题 Configuration config = new Configuration();
config.configure("hibernate配置文件位置");
config.addClass(Book.class);
nishizhua33 2009-06-09
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当提交第一个页面后 出现的错误信息

java.lang.NullPointerException
sunyang.service.BookServiceHibernateImpl.add(BookServiceHibernateImpl.java:27)
sunyang.action.BookAction.addBook(BookAction.java:27)
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)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:440)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:279)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:242)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:163)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:249)
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:148)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:93)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:128)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
org.apache.struts2.interceptor.ProfilingActivationInterceptor.intercept(ProfilingActivationInterceptor.java:104)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:148)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:128)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:468)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:395)


note The full stack trace of the root cause is available in the Apache Tomcat/6.0.16 logs.

nishizhua33 2009-06-09
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这个是hibernate.cfg.xml



<!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="show_sql">true</property>

		<property name="hibernate.connection.url">jdbc:mysql://localhost/book</property>

		<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver  </property>

		<property name="hibernate.connection.username">root</property>

		<property name="hibernate.connection.password">admin</property>

		<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>

		<mapping resource="sunyang/domain/Book.hbm.xml"/>

		

	</session-factory>

</hibernate-configuration>



struts.xml

<?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>

	<constant name="struts.i18n.encoding" value="GBK" />

	<package name="default" extends="struts-default">

	<action name="add" class="sunyang.action.BookAction" method="addBook">

			<result type="chain">list</result>

		</action>

		<action name="list" class="sunyang.action.BookAction" method="ListBook">

			<result>/success.jsp</result>

		</action> 

	</package>

</struts>
nishizhua33 2009-06-09
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BookAction.java



package sunyang.action;



import java.util.List;



import sunyang.domain.Book;

import sunyang.service.BookService;

import sunyang.service.BookServiceHibernateImpl;



import com.opensymphony.xwork2.ActionSupport;



@SuppressWarnings("serial")

public class BookAction extends ActionSupport {

	private BookService service;

	private String bookname;

	private List list;



	// 省略对应bookname和list的getter和setter



	public BookAction() {

		service = new BookServiceHibernateImpl();

	}



	public String addBook() {

		Book book = new Book();

		book.setBookname(bookname);

		System.out.println(bookname);

		service.add(book);

		

		return SUCCESS;

	}



	public String ListBook() {

		List l = service.find();

		setList(l);

		return SUCCESS;

	}



	public String getBookname() {

		return bookname;

	}



	public void setBookname(String bookname) {

		this.bookname = bookname;

	}



	public List getList() {

		return list;

	}



	public void setList(List list) {

		this.list = list;

	}

}



Book.java



package sunyang.domain;



public class Book {



	private Integer id;

	private String bookname;



	public Book() {

	}



	public Book(Integer id) {

		this.id = id;

	}



	public Book(Integer id, String bookname) {

		this.id = id;

		this.bookname = bookname;

	}



	public Integer getId() {

		return this.id;

	}



	public void setId(Integer id) {

		this.id = id;

	}



	public String getBookname() {

		return this.bookname;

	}



	public void setBookname(String bookname) {

		this.bookname = bookname;

	}



}



Book.hbm.xml



<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">



<hibernate-mapping>

	<class name="sunyang.domain.Book" table="book" catalog="book">

		<id name="id" type="java.lang.Integer">

			<column name="id" />

			<generator class="native" />

		</id>

		<property name="bookname" type="java.lang.String">

			<column name="bookname" length="45" />

		</property>

	</class>

</hibernate-mapping>



BookService.java



package sunyang.service;



import java.util.List;



import sunyang.domain.Book;



public interface BookService {

	// 插入信息操作

	public void add(Book book);



	// 查询所有信息操作

	public List find();

}



BookServiceHibernateImpl.java



package sunyang.service;



import java.util.List;



import org.hibernate.Query;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.Transaction;

import org.hibernate.cfg.Configuration;



import sunyang.domain.Book;



public class BookServiceHibernateImpl implements BookService {

	//实例化Book对象的session工厂，以便调用Hibernate接口

	public static SessionFactory sessionFactory;

	static {

		try {

			Configuration config = new Configuration();

			config.addClass(Book.class);

			sessionFactory = config.buildSessionFactory();

		} catch (Exception e) {

			e.printStackTrace();

		}

	}



	public void add(Book book) {

		Session session = sessionFactory.openSession();

		//声明并管理事务

		Transaction tx = null;

		try {

			tx = session.beginTransaction();

			session.saveOrUpdate(book);

			tx.commit();

		} catch (Exception e) {

			if (tx != null) {

				tx.rollback();

			}

		} finally {

			session.close();

		}



	}



	public List find() {

		Session session = sessionFactory.openSession();

		Transaction tx = null;

		try {

			tx = session.beginTransaction();

			Query query = session.createQuery("from Book");

			List list = query.list();

			tx.commit();

			return list;

		} catch (Exception e) {

			if (tx != null) {

				tx.rollback();

			}

		} finally {

			session.close();

		}

		return null;

	}



}


linuxlsx 2009-06-09
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你出了什么错也不说一下 我们怎么查啊
zidasine 2009-06-09
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错误信息呢 贴出来
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