使用Struts+Hibernate上传大对象(BLOB)

最新推荐文章于 2021-02-04 20:47:31 发布

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#struts #hibernate #string #html #integer #action

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本文介绍了一个基于Struts框架的文件上传实现方案，包括数据库表结构设计、JSP页面代码、JavaBean实体类定义、Hibernate映射配置、Struts ActionForm及Action处理逻辑等关键环节。

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主要用于上传图片或文件:

流程:首先在add.jsp中选择要上传的文件或图片,点击确定.Struts中的ActionForm验证,验证无误就到Action类中继续操作,Action类调用PhotoDao类的addPhoto方法保存图片

1,数据库表

create table(

 id int primary key auto_increment,

name varchar(20),

photo blob

)
2,add.jsp页面代码<%@ page language="java" pageEncoding="ISO-8859-1"%>

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%> 

<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html"%>

 <html> 	

    <head>		

        <title>JSP for AddForm form</title>	

   </head>	

   <body>		

        <html:form action="/add" enctype="multipart/form-data">			

           name : <html:text property="name"/><html:errors property="name"/><br/>			

           photo : <html:file property="photo"/><html:errors property="photo"/><br/>		

                       <html:submit/><html:cancel/>		

        </html:form>	

   </body>

</html>

3,JAVABEAN:photo代码如下

package com.hp.entity;

import java.sql.Blob;

public class Photo implements java.io.Serializable {

	private Integer id;

	private String name;

	//注意photo的类型

	private Blob photo;

	public Photo() {

	}

	public Photo(String name) {

		this.name = name;

	}

	public Photo(String name, Blob photo) {

		this.name = name;

		this.photo = photo;

	}

	public Integer getId() {

		return this.id;

	}

	public void setId(Integer id) {

		this.id = id;

	}

	public String getName() {

		return this.name;

	}

	public void setName(String name) {

		this.name = name;

	}
	public Blob getPhoto() {

		return photo;

	}
	public void setPhoto(Blob photo) {

		this.photo = photo;

	}
}

//PhotoDao代码如下

package com.dao;

import org.hibernate.Query;

import org.hibernate.Session;

import org.hibernate.Transaction;

import com.hp.entity.Photo;

import com.hp.util.*;

public class PhotoDao {

	private Session session=null;

	public PhotoDao(){

		this.session = HibernateSessionFactory.getSession();

	}

	public void addPhoto(Photo photo){

		Transaction tx=session.beginTransaction();

		session.saveOrUpdate(photo);

		tx.commit();

	}

	public Photo getByName(String name){

		Query query=session.createQuery("from Photo p where p.name = ?");

		query.setString(0,name);

		return (Photo) query.uniqueResult();

	}

	public void close(){

		if(session.isOpen()){

			session.close();

			session=null;

		}

	}

}

5,Photo的Hiberante表映射文件

<?xml version="1.0" encoding="utf-8"?>

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

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

<!-- 

    Mapping file autogenerated by MyEclipse Persistence Tools

-->

<hibernate-mapping>

    <class name="com.hp.entity.Photo" table="photo" catalog="test">

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

            <column name="id" />

            <generator class="native" />

        </id>

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

            <column name="name" length="10" not-null="true" />

        </property>

        <!--注意下面的类型-->

        <property name="photo" type="java.sql.Blob">

            <column name="photo" />

        </property>

    </class>

</hibernate-mapping>
6,struts的ActionForm代码

package com.hp.struts.form;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionErrors;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.upload.FormFile;

public class AddForm extends ActionForm {

	//在Struts中上传文件需要使用FormFile类型

	private FormFile photo;
	private String name;

	public ActionErrors validate(ActionMapping mapping,

			HttpServletRequest request) {

		return null;

	}
	public void reset(ActionMapping mapping, HttpServletRequest request) {

	}

	public FormFile getPhoto() {

		return photo;

	}
	public void setPhoto(FormFile photo) {

		this.photo = photo;

	}
	public String getName() {

		return name;

	}
	public void setName(String name) {

		this.name = name;

	}

}

7,struts的Action代码

package com.hp.struts.action;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.sql.Blob;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.upload.FormFile;

import org.hibernate.Hibernate;

import com.dao.*;

import com.hp.entity.Photo;

import com.hp.struts.form.AddForm;

public class AddAction extends Action {

	public ActionForward execute(ActionMapping mapping, ActionForm form,

			HttpServletRequest request, HttpServletResponse response) {

		AddForm addForm = (AddForm) form;

		String name = addForm.getName();

		// 在Struts中上传文件需要使用FormFile

		FormFile formFile = addForm.getPhoto();

		System.out.println("name =" + name);

		System.out.println("size =" + formFile.getFileSize());

		Photo photo= new Photo();

		//将FormFile类型的图片信息转换为字节数组类型

		try {

			byte[] buf= formFile.getFileData();

			//使用Hibernate的工具将字节数组转换成Blob对象

			Blob ph= Hibernate.createBlob(buf);

			photo.setName(name);

			photo.setPhoto(ph);

			PhotoDao photoDao = new PhotoDao();

			photoDao.addPhoto(photo);

			//以上为插入图片,下面为读取刚才插入的图片,按name查找图片

			Photo temp = photoDao.getByName(name);

			//将BLOB对象转化为输入流的形式

			InputStream in=temp.getPhoto().getBinaryStream();

			//先在C盘生成temp文件,用于保存图片

			OutputStream os = new FileOutputStream(new File("c://temp.jpg"));

			//把输入流中的数据读入buf数组中

			in.read(buf);

			//从buf数组中读出数据

			os.write(buf);

			in.close();

			os.close();

			request.getSession().setAttribute("photo","c://temp.jpg");

			photoDao.close();

		} catch (Exception e) {

			e.printStackTrace();

		}

		return mapping.findForward("success");

	}

	public static void main(String[] args) {

		System.out.println(System.getProperty("user.dir"));

	}

}
8,用于显示插入图片的页面show.jsp
<%@ page language="java" pageEncoding="ISO-8859-1"%>

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>

<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>

<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>

<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html:html lang="true">

  <head>

    <html:base />

    <title>show.jsp</title>

  </head>

  <body>

  	<html:img src="${photo}"/>

  </body>

</html:html>