SSH整合小例子

此例子来自于《轻量级JavaEE企业应用开发》（李刚著）

本例子实现了Spring来整合Struts和Hibernate，这是一个添加书本功能的小示例
首先实体类Book

package com.domain;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="my_books")
public class Book {
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="id")
    private Integer id;
    @Column(name="title")
    private String title;
    @Column(name="author")
    private String author;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getAuthor() {
        return author;
    }
    public void setAuthor(String author) {
        this.author = author;
    }
}

基本DAO接口，如果还有其他的DAO可以实现这个接口

package com.dao;

import java.io.Serializable;
import java.util.List;

public interface BaseDao {
    //根据ID加载实体
    T get(Class entityClazz, Serializable id);
    //保存实体
    Serializable save(T entity);
    //更新实体
    void update(T entity);
    //删除
    void delete(T entity);
    //根据ID删除实体
    void delete(Class entityClazz, Serializable id);
    //获取所有实体 
    List findAll(Class entityClass);
    //获取实体总数
    long findCount(Class entityClazz);
}

BookDao接口

package com.dao;

import com.domain.Book;

public interface BookDao extends BaseDao {
    //这里没有内容是因为不需要增加什么方法了
}

Hbiernate4的基本Dao的实现类

package com.dao.impl;

import java.io.Serializable;
import java.util.List;

import org.hibernate.Query;
import org.hibernate.SessionFactory;

import com.dao.BaseDao;

public class BaseDaoHibernate4 implements BaseDao {
    private SessionFactory sessionFactory;

    public SessionFactory getSessionFactory() {
        return sessionFactory;
    }

    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }

    @SuppressWarnings("unchecked")
    @Override
    public T get(Class entityClazz, Serializable id) {
        // TODO Auto-generated method stub
        return (T)getSessionFactory().getCurrentSession().get(entityClazz, id);
    }

    @Override
    public Serializable save(T entity) {
        // TODO Auto-generated method stub
        return getSessionFactory().getCurrentSession().save(entity);
    }

    @Override
    public void update(T entity) {
        // TODO Auto-generated method stub
        getSessionFactory().getCurrentSession().saveOrUpdate(entity);
    }

    @Override
    public void delete(T entity) {
        // TODO Auto-generated method stub
        getSessionFactory().getCurrentSession().delete(entity);
        
    }

    @Override
    public void delete(Class entityClazz, Serializable id) {
        // TODO Auto-generated method stub
        getSessionFactory().getCurrentSession().
            createQuery("delete " + entityClazz.getSimpleName() + 
            "en where en.id = ?0").setParameter("0", id).executeUpdate();
        
    }

    @Override
    public List findAll(Class entityClass) {
        // TODO Auto-generated method stub
        String sql = "select en from " + entityClass.getSimpleName() + " en";
        return find(sql);
    }

    @Override
    public long findCount(Class entityClazz) {
        // TODO Auto-generated method stub
        List list = find("select count(*) from " + entityClazz.getSimpleName());
        if(list != null && list.size() == 1) {
            return (long) list.get(0);
        }
        return 0;
    }
    @SuppressWarnings("unchecked")
    protected List find(String hql) {
        return getSessionFactory().
                getCurrentSession().createQuery(hql).list();
    }
    /**
     * 根据带占位符参数的HQL语句查询实体
     * @param hql
     * @param params
     * @return
     */
    @SuppressWarnings("unchecked")
    protected List find(String hql, Object... params) {
        Query query = getSessionFactory().
                getCurrentSession().createQuery(hql);
        for(int i = 0; i < params.length; i++) {
            query.setParameter(i + "", params[i]);
        }
        return query.list();
    }
    /**
     * 分页查询
     * @param hql
     * @param pageNo查询第几页的记录
     * @param pageSize一页多少行
     * @return
     */
    @SuppressWarnings("unchecked")
    protected List findByPage(String hql, int pageNo, int pageSize) {
        return getSessionFactory().getCurrentSession()
                .createQuery(hql).setFirstResult((pageNo-1)*pageSize)
                .setMaxResults(pageSize).list();
    }
    
    protected List findByPage(String hql, int pageNo, int pageSize, Object... params) {
        Query query = getSessionFactory().getCurrentSession()
                .createQuery(hql).setFirstResult((pageNo-1)*pageSize)
                .setMaxResults(pageSize);
        for(int i = 0; i < params.length; i++) {
            query.setParameter(i+"", params[i]);
        }
        return query.list();
    }
}

BookDao实现类

package com.dao.impl;

import com.dao.BookDao;
import com.domain.Book;

public class BookDaoHibernate4 extends BaseDaoHibernate4 implements BookDao {
    //这里也没有内容是因为不需要添加什么方法
}

BookService接口

package com.service;

import com.domain.Book;

public interface BookService {
    //添加图书
    int addBook(Book book);
}

BookService实现类

package com.service.impl;

import com.dao.BookDao;
import com.domain.Book;
import com.service.BookService;

public class BookServiceImpl implements BookService {
    
    private BookDao bookDao;
    
    public void setBookDao(BookDao bookDao) {
        this.bookDao = bookDao;
    }

    @Override
    public int addBook(Book book) {
        // TODO Auto-generated method stub
        return (int) bookDao.save(book);
    }

}

Action类

package com.action;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

import com.domain.Book;
import com.opensymphony.xwork2.ActionSupport;
import com.service.BookService;
import com.service.impl.BookServiceImpl;

public class BookAction extends ActionSupport {
    private BookService bookService;
    public void setBookService(BookService bookService) {
        this.bookService = bookService;
    }
    private Book book;

    public Book getBook() {
        return book;
    }
    public void setBook(Book book) {
        this.book = book;
    }
    public String add() throws Exception {
        int result = bookService.addBook(book);
        if(result > 0) {
            addActionMessage("图书添加成功");
            return SUCCESS;
        }
        addActionMessage("图书添加失败");
        return ERROR;
    }
    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        System.out.println("默认的BookAction");
        return super.execute();
    }
    
}

struts.xml文件，在src文件夹下

    
    
    
        
        
            success.jsp
            error.jsp
        
        
            {1}.jsp
        
    

web.xml，在WEB-INF文件夹下

  TestSSH
  
    index.html
    index.htm
    index.jsp
    default.html
    default.htm
    default.jsp
  
  
  
    org.springframework.web.context.ContextLoaderListener
  
  
  
    contextConfigLocation
    /WEB-INF/applicationContext.xml
  
  
  
    struts2
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
  
  
    struts2
    /*
  

applicationContext.xml在WEB-INF文件夹下

    
    
    
    
    
    
        
        
            
                com.domain.Book
            
        
        
        
            
                
                
                    org.hibernate.dialect.MySQL5InnoDBDialect
                
                
                update
                
                true
                
                true
            
        
    
    
    
    
    
    
    
    
    
    
    
    
    
    
        
            
            
            
            
        
    
    
        
        
        
        
        
    

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>








    
    
    

之后还要写success.jsp和error.jsp，用来标明是否插入成功了
做好了之后的项目文件结构是这样的

文件结构

值得注意的是struts.xml的class要用bean的id还有在web.xml中指定applicationContext.xml文件的路径才可以正确将action从struts中转到spring