jsp上传图片,并加以显示 -

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jsp上传图片,并加以显示

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图片显示

JSP jQuery CSS 框架 Cache

上传图片代码如下,首先是页面:

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

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

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

<html>

  <head>

    <base href="<%=basePath%>">
    
    <title>My JSP 'index1.jsp' starting page</title>
 
	<meta http-equiv="pragma" content="no-cache">

	<meta http-equiv="cache-control" content="no-cache">

	<meta http-equiv="expires" content="0">    

	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

	<meta http-equiv="description" content="This is my page">

	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">

	-->

  </head>

  <body>

  这是一个图片上传程序,在上传的时候form必须加上 enctype="multipart/form-data"

  否则则会有报错的情况发生,action类里新建一个demo对象,对应数据库里一条新的记录

  大概方法就是这样,如果有需要的话还可以再扩展,图片上传代码完毕

  <form id="form1" name="form1" action="text.do" method="post" enctype="multipart/form-data">

  	<input type="file" id="userImage" name="userImage">

 	<input type="text" id="mytext" name="mytext">

  <input type="submit" value="确定">

  </form>

    </body>

</html>

传递至textAction这个类中

我用的是springside的框架,这个框架中的action默认执行的方法是list,其它不变

下边是action类

package com.mytext.action;

import java.awt.image.BufferedImage;

import java.io.ByteArrayInputStream;
import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

import org.apache.commons.io.output.ByteArrayOutputStream;

import org.springframework.beans.factory.annotation.Autowired;

import org.springside.modules.web.struts2.CRUDActionSupport;

import com.mytext.entity.Demo;

import com.mytext.service.DemoServices;

import com.sun.xml.internal.ws.util.ByteArrayBuffer;

@SuppressWarnings("serial")

public class TextAction extends CRUDActionSupport<Demo>{

	@Autowired

	private DemoServices demoServices;
	
	private Demo demo;

	private String mytext;

	private File userImage;

	@Override

	public String delete() throws Exception {

		// TODO Auto-generated method stub

		return null;

	}

	@Override

	public String list() throws Exception {		

	if(userImage==null)

		{
				return "try";
			}

			prepareModel();

		try {

				BufferedImage tt = ImageIO.read(userImage);

				demo.setImage(toByte(tt));

				demo.setName(mytext);

				demoServices.save(demo);




			} catch (Exception e) {

				System.out.println("保存失败");

				return "try";

			}

			return "try";
	
		//demoServices.getAllDemo();	
	}


//转化为流

	private byte[] toByte(BufferedImage image) throws IOException


	{	


		ByteArrayOutputStream cc = new   ByteArrayOutputStream();


			ImageIO.write(image, "jpg", cc);

			return cc.toByteArray();	

	}

	@Override

	protected void prepareModel() throws Exception {

		// TODO Auto-generated method stub

		demo = new Demo();
	}

	@Override

	public String save() throws Exception {

		// TODO Auto-generated method stub

		return null;

	}

	public Demo getModel() {

		// TODO Auto-generated method stub

		return demo;

	}

	public File getUserImg() {

		return userImage;

	}

	public void setUserImg(File userImage) {

		this.userImage = userImage;

	}

	public String getMytext() {

		return mytext;

	}

	public void setMytext(String mytext) {

		this.mytext = mytext;

	}

	public File getUserImage() {

		return userImage;
	}

	public void setUserImage(File userImage) {

		this.userImage = userImage;

	}
}

文中加红的为保存方法,是springside独有的一个东西,不必深究,可跟据自己的框架来保存对象至数据库中

下边是我数据库的实体类

package com.mytext.entity;

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

/**
 * Demo entity.
 * 
 * @author MyEclipse Persistence Tools
 */
@Entity
@Table(name = "demo")
public class Demo extends IdEntity implements java.io.Serializable




{

	private String name;
	private byte[] image;
	private String shouming;
	public Demo() {
	}
	public Demo(String name, byte[] image) {
		this.name = name;
		this.image = image;
	}

	@Column(name = "name", length = 15)
	public String getName() {
		return this.name;
	}

	public void setName(String name) {
		this.name = name;
	}

	@Column(name = "image")
	public byte[] getImage() {
		return this.image;
	}

	public void setImage(byte[] image) {
		this.image = image;
	}
	@Column(name="shouming", length = 225)
	public String getShouming() {
		return shouming;
	}
	public void setShouming(String shouming) {
		this.shouming = shouming;
	}

}

继承了一个共用的类,用于id主键生成

package com.mytext.entity;

import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;
//所有实体类的基类,实现id的自增长
@MappedSuperclass
public class IdEntity {
	private Long id;

	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}
}

我用的是mysql数据库,测试己成功,action方法中继承的是springside框架中的action类,不用这个框架的不必深究,

以下是在jsp页面中读出图片的方法

先是jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<c:set var="ctx" value="${pageContext.request.contextPath}"/>
<%@ taglib prefix="s" uri="/struts-tags"  %>




     <!--  注意标签库的异入>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>jquery编辑器实例</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
	<link rel="stylesheet" href="${ctx }/edit/common.css" type="text/css" media="screen" />
	<script type="text/javascript" src="${ctx }/edit/jquery/jquery-1.3.2.min.js"></script>
	<script type="text/javascript" src="${ctx }/edit/xheditor.js"></script>
  </head>
  <body>
  <!--  jquery的编辑器试验己成功,能够成功写入数据库,能够成功在页面上显示出来 -->
  一般模式的edit
  <form method="post" action="edit.do">
	<h3>xhEditor demo1 : 默认模式</h3>
	xheditor(默认完全):<br />
	<textarea id="elm1" name="elm1" class="xheditor" rows="12" cols="80" style="width: 80%">
    <p>请输入信息</p>
    </textarea>
    <br>
     <input type="submit" value="试验中的jquery编辑器">
   </form>
   <!-- 从数据库里边读出一个图片 至此,图片上传和显示制做完毕-->
   开始从数据库里边读出来一个图片<br>
   <img src="<s:url action="edit!getUserImgFromByte.do">
   <s:param name="id" value="5"></s:param>
   </s:url>" height="300px" width="300px"> 








  </body>
</html>

红色部分为显示图片,可人为控制图看大小,上边的是一个类似于fck的jquery编辑器

action方法

package com.mytext.action;

import java.io.IOException;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springside.modules.web.struts2.CRUDActionSupport;
import org.springside.modules.web.struts2.Struts2Utils;

import com.mytext.entity.Demo;
import com.mytext.service.DemoServices;

public class EditAction extends CRUDActionSupport<Demo>{

	/**
	 * 
	 */
	@Autowired
	private DemoServices demoSdrvices;
	
	private Long id;
	private String elm1;
	private Demo demo;

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	@Override
	public String delete() throws Exception {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public String list() throws Exception {
		id=1L;
		getModel();
		demo.setShouming(elm1);
		demoSdrvices.save(demo);
		return "showedit";
	}

	@Override
	protected void prepareModel() throws Exception {
		// TODO Auto-generated method stub
		
	}

	@Override
	public String save() throws Exception {
		// TODO Auto-generated method stub
		return null;
	}

	public Demo getModel() {
		if(id==null)
		{
			demo=new Demo();
		}
		else
		{
			demo = demoSdrvices.get(id);
		}
		return demo;
	}

	public String getElm1() {
		return elm1;
	}

	public void setElm1(String elm1) {
		this.elm1 = elm1;
	}

	public Demo getDemo() {
		return demo;
	}

	public void setDemo(Demo demo) {
		this.demo = demo;
	}
	public String getUserImgFromByte() throws Exception {
		getModel();
		HttpServletResponse response = Struts2Utils.getResponse();
		ServletOutputStream out = null;
		try {
			response.setContentType("image/jpeg");
			out = response.getOutputStream();
			out.write(demo.getImage());
			out.flush();
		} catch (Exception e) {
		} finally {
			try {
				if (null != out)
					out.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return null;
	}





}

红色部分为从数据库读图片代码

转载使用请注明出处!写的时候不知道,后来才发现代码内部不能加红!!!

真屎!

读本人博客代码如有任何疑问或代码不能执行,请速联系本人

zhang7789@yahoo.com.cn

分享到：

jquery 的一个文本编辑框架 | 用javamail来发邮件

2009-06-08 18:24
浏览 35767
评论(2)
查看更多

2 楼 Chrome_1 2016-07-15

需要导入的jar包有哪些

1 楼 wen.owen 2015-01-08

是不是从哪里转过来的文章，哪里有红色部分？

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