Struts2文件上传功能浅析

it2024-12-15 19

本文将以图片上传为例，解析Struts2文件上传的主要过程实例的功能：1、在jsp页面选择要上传的图片， 2、为待上传的图片取名，以便于查找

3、点击提交后，直接进入图片展示页面， 4、选择要展示的图片名后，图片显示

代码及主要解释：jsp页面代码：图片上传页面uploadForm.jsp：<body><s:form action="addPicPro" enctype="multipart/form-data"> <s:textfield name="picName" label="图片名"/> <s:file name="pic" label="选择上传图片"/> <s:submit value="提交"/></s:form></body>图片展示页面listPics：<body><s:select list="pics" listKey="fileName" listValue="picName" label="选择图片" οnchange="document.getElementById('show').src='upload/'+ this.value;"/><br/> <img id="show"/></body>

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AddPicProAction:public class AddPicProAction implements Action{ private String picName; //输入的文件名

//文件上传域需要用三个File进行封装 private File pic; //上传文件本身 private String picFileName; //上传文件的原始文件名 private String picContentType;//上传文件的文件类型

public String getPicName() { return picName; }

public void setPicName(String picName) { this.picName = picName; }

public File getPic() { return pic; }

public void setPic(File pic) { this.pic = pic; }

public String getPicFileName() { return picFileName; }

public void setPicFileName(String picFileName) { this.picFileName = picFileName; }

public String getPicContentType() { return picContentType; }

public void setPicContentType(String picContentType) { this.picContentType = picContentType; }

@Override public String execute() throws Exception { //获取/upload文件夹的绝对路径 String uploadPath = ServletActionContext.getServletContext().getRealPath("/upload"); //文件新名字，以一个随机数区分开 String newFileName = UUID.randomUUID().toString() + picFileName.substring(picFileName.lastIndexOf("."));

//新建一个文件输入流,待上传的文件 FileInputStream fileInputStream = new FileInputStream(pic); //新建一个文件输出流，上传的物理目录 FileOutputStream fileOutputStream = new FileOutputStream(uploadPath+"\\"+newFileName);

byte[] buff = new byte[1024]; int hasRead = 0; System.out.print(newFileName); while ((hasRead = fileInputStream.read(buff)) > 0){ fileOutputStream.write(buff,0,hasRead); } System.out.print(newFileName);

fileInputStream.close(); fileOutputStream.close();

//=========上面文件上传已经成功============

PicService picService = new PicService(); picService.addPic(picName,newFileName); return SUCCESS; }}

这里简要介绍一下介绍将upload文件夹新建在何位置：如果用的eclipse,直接新建在WebContent根目录下；而我自己用的是IntelliJ IDEA，在测试很久之后才发现要新建在out/artifacts/***_war_exploded/下，（测试方法：打印输出ServletActionContext.getServletContext().getRealPath("/upload")，可知道文件夹应新建在什么位置）;

图例如下：

Struts2对于文件上传，需要在Action中提供三个File进行封装1、与文件上传域的name相同，类型为File的File2、取名为文件上传域的name+FileName ,类型为String的File3、取名为文件上传域的name+ContentType，类型为String的File

ListPicsAction:public class ListPicsAction implements Action{ private List<Pic> pics ;

public List<Pic> getPics() { return pics; }

public void setPics(List<Pic> pics) { this.pics = pics; }

@Override public String execute() throws Exception { PicService picService = new PicService(); setPics(picService.getAllPics()); return SUCCESS; }}

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图片类Pic:public class Pic { private Integer id; private String picName; private String fileName; //磁盘保存的文件名

public Pic() { }

public Pic(Integer id, String picName, String fileName) { this.id = id; this.picName = picName; this.fileName = fileName; }

public Integer getId() { return id; }

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

public String getFileName() { return fileName; }

public void setFileName(String fileName) { this.fileName = fileName; }

public String getPicName() { return picName; }

public void setPicName(String picName) { this.picName = picName; }}

PicService类：public class PicService { static List<Pic> picDB = new ArrayList<Pic>(); public void addPic(String picName,String fileName){ picDB.add(new Pic(new Random().nextInt(9999),picName,fileName)); }

public List<Pic> getAllPics() { return picDB; }}

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Struts.xml的配置<action name="addPicPro" class="action.AddPicProAction"> <result name="success" type="chain">listPics</result></action><action name="listPics" class="action.ListPicsAction"> <result>/WEB-INF/content/listPics.jsp</result></action>

转载于:https://www.cnblogs.com/chentao-cus/p/4740752.html

相关资源：数据结构—成绩单生成器

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