JAVA SSH ----Struts上传与下载文件

文件上传

Action类

    private File image;    private String imageContentType;    private String imageFileName;    public void setImage(File image) {        this.image = image;    }    public void setImageContentType(String imageContentType) {        this.imageContentType = imageContentType;    }    public void setImageFileName(String imageFileName) {        this.imageFileName = imageFileName;    }    public String upload(){        System.out.println("此时的file是"+image+":  \r\n" + imageContentType + " :  " + imageFileName);        String path = ServletActionContext.getServletContext().getRealPath("/upload");        File destFile = new File(path,imageFileName);        try {            FileUtils.copyFile(image, destFile);        } catch (IOException e) {            System.out.println("复制文件出现错误");            return "input";        }        return SUCCESS;    }

upload.jsp页面

    <%@taglib uri="/struts-tags" prefix="s" %>    <!-- 上传错误信息显示 -->    <s:fielderror></s:fielderror>    <form action="{pageContext.request.contextPath}/uploadAction.action"     method="post" enctype="multipart/form-data" >    上传一个图片吧<br/>        <input type = "file" name="image"><br/>        <input type="submit" value="提交按钮"/>    </form>

注意：表单的enctype类型应该设置为multipart/form-data,file input标签中的name应该与Action类中的File保持一致

配置文件

修改英文错误信息
1、编写一个fileupload.properties 文件(文件名和路径随意)
2、编辑如下

3、加载编写的资源文件 struts.xml

<constant name="struts.custom.i18n.resources"    value="cn.itcast.upload.fileupload"></constant>

name属性值默认在default.properties的165行(默认被注释)
value属性值如果文件在包下包使用.分隔,且不要带文件的后缀。如果有多个资源文件使用,号隔开。

* 文件下载 *

Action类

public class DownloadAction extends ActionSupport{    public String list(){        String path = ServletActionContext.getServletContext().getRealPath("/upload");        File file = new File(path);        String[] fileNames = file.list();        ActionContext ac = ActionContext.getContext();        Map<String,Object> request = ac.getContextMap();        request.put("fileNames",fileNames);        return "list";    }    /*    文件下载      */    //1.获取到文件名    private String fileName;    public void setFileName(String fileName){        try {            fileName = new String(fileName.getBytes("iso8859-1"),"utf-8");        } catch (UnsupportedEncodingException e) {            throw new RuntimeException(e);        }        this.fileName = fileName;    }    //2.获取文件流//  private InputStream imageStream;    public InputStream getImageStream(){        return ServletActionContext.getServletContext().getResourceAsStream("/upload/"+fileName);    }    //3.给浏览器文件名    public String getDownFileName(){        //需要进行中文编码        try {            fileName=URLEncoder.encode(fileName, "UTF-8");        } catch (UnsupportedEncodingException e) {            throw new RuntimeException(e);        }        return fileName;    }    //down方法    public String down(){        System.out.println("down Action run...");        return "down";    }}

jsp文件

    <table align="center" border="1">        <tr>            <td>编号</td>            <td>文件名</td>            <td>操作</td>        </tr>        <c:forEach var="fileName" items="${fileNames }" varStatus="vs">            <td>${vs.count }</td>            <td>${fileName }</td>            <td>                <c:url var="url" value="down_down.action">                    <c:param name="fileName" value="${fileName }"></c:param>                </c:url>                <a href="${url }">下载</a>            </td>        </c:forEach>    </table>    

struts配置文件

        <action name = "down_*" class="action.DownloadAction" method="{1}">            <result name = "list" >/list.jsp</result>            <result name="down" type="stream">                <!-- 允许下载的文件的类型：指定为二进制文件的类型 -->                <param name="contentType">application/octet-stream</param>                <!-- 对应Action的属性，返回流的属性，其实就是getImageStream -->                <param name="inputName">imageStream</param>                <!-- 下载头，包括：浏览器显示的文件名 -->                <param name="contentDisposition">attachment;filename=${downFileName}</param>                <!-- 缓冲区的大小 -->                <param name="bufferSize">1024</param>               </result>        </action>