struts2学习之文件的上传与下载

单文件上传

SingleUploadAction.java

public class SingleUploadAction extends ActionSupport implements Serializable {    private static final long serialVersionUID = -1732593542292662802L;    //对应表单输入域name="image"，Struts2框架会封装成File类型的    private File image;    //上传文件的名称,自定义的image和FileName的组合，由struts封装    private String imageFileName;    //上传文件的MIME类型，自定义的image和ContentType的组合，由struts封装    private String imageContentType;        public String singleUpload() {        try {            //得到文件名            String filename = this.imageFileName;            //得到ServletContext对象的引用            ServletContext context = ServletActionContext.getServletContext();            //构建存储路径            String savepath = context.getRealPath("/upload");                                   //读写入数据，把上传文件拷贝到新建目录                    FileUtils.copyFile(image, new File(savepath, filename));            ActionContext.getContext().put("message", "上传成功！");            return SUCCESS;        } catch (Exception e) {            e.printStackTrace();            ActionContext.getContext().put("message", "上传失败！");            return ERROR;        }    }    public File getImage() {        return image;    }    public void setImage(File image) {        this.image = image;    }    public String getImageFileName() {        return imageFileName;    }    public void setImageFileName(String imageFileName) {        this.imageFileName = imageFileName;    }    public String getImageContentType() {        return imageContentType;    }    public void setImageContentType(String imageContentType) {        this.imageContentType = imageContentType;    }}

upload.jsp

普通单文件上传表单

<b>普通表单单文件上传</b><br/><form action="${pageContext.request.contextPath }/upload/singleupload" method="post" enctype="multipart/form-data">    文件：<input type="file" name="image"/><br/>       <input type="submit" value="上传"></form>

struts2单文件上传表单

<b>struts表单单文件上传</b><s:form action="singleupload" namespace="/upload" enctype="multipart/form-data">    <s:file name="image" label="文件"></s:file>    <s:submit value="上传"/></s:form>

两个表单都必须添加enctype=”multipart/form-data”属性，否则会出错，无法上传。最好在里也添加method=”post”，不易出问题。

struts.xml

省略DTD部分。

<!-- 限制文件上传大小5M --><constant name="struts.multipart.maxSize" value="5242880"></constant><package name="upload" namespace="/upload" extends="struts-default">    <action name="singleupload" class="com.struts2.action.example.SingleUploadAction" method="singleUpload">        <result name="success">/WEB-INF/jsp/success.jsp</result>    </action>               </package>

回执页面uploadsuccess.jsp

文件名：<s:property value="imageFileName"/><br>文件类型：<s:property value="imageContentType"/><br/><br/>

多文件上传

MoreUploadAction.java

public class MoreUploadAction extends ActionSupport implements Serializable {    private static final long serialVersionUID = 7962335953329769349L;    private File images[];    private String[] imagesFileName;    private String[] imagesContentType;    public File[] getImages() {        return images;    }    public void setImages(File[] images) {        this.images = images;    }    public String[] getImagesFileName() {        return imagesFileName;    }    public void setImagesFileName(String[] imagesFileName) {        this.imagesFileName = imagesFileName;    }    public String[] getImagesContentType() {        return imagesContentType;    }    public void setImagesContentType(String[] imagesContentType) {        this.imagesContentType = imagesContentType;    }    public String moreUpload() {        try {                       if(images!=null&&images.length>0){                //得到ServletContext对象的引用                ServletContext sc = ServletActionContext.getServletContext();                //构建存储路径                String storePath = sc.getRealPath("/files");                for(int i=0;i<images.length;i++)                    FileUtils.copyFile(images[i], new File(storePath,imagesFileName[i]));            }            ActionContext.getContext().put("message", "上传成功！");            return SUCCESS;            } catch (Exception e) {                e.printStackTrace();                ActionContext.getContext().put("message", "上传失败！");                return ERROR;            }    }}

即将属性改为数组即可。

upload.jsp

普通多文件上传表单

<b>普通表单多文件上传</b><form action="${pageContext.request.contextPath }/upload/moreupload" method="post" enctype="multipart/form-data">    文件：<input type="file" name="images"/><br/>    文件：<input type="file" name="images"/><br/>      文件：<input type="file" name="images"/><br/>          <input type="submit" value="上传"></form>

struts2多文件上传表单

<b>struts表单多文件上传</b><s:form action="moreupload"  namespace="/upload" method="post" enctype="multipart/form-data">    <s:file name="images" label="文件"></s:file>    <s:file name="images" label="文件"></s:file>    <s:file name="images" label="文件"></s:file>    <s:submit value="上传"/></s:form>

struts.xml

<action name="moreupload" class="com.struts2.action.example.MoreUploadAction" method="moreUpload">        <result name="success">/WEB-INF/jsp/success.jsp</result></action>

文件下载

客户端用户右键选择“另存为…”来下载，在回执页面添加如下代码：

<p>文件下载</p><s:a href="%{imageFileName}">普通下载[右键另存为]</s:a>

以上。。。