使用struts2进行文件下载以及下载权限控制的例子

来源：互联网发布：wifi共享大师for mac 编辑：程序博客网时间：2024/06/06 20:07

本测试有两个模块，一个是文件上上传，一个是文件下载，文件下载的时候会检查是否足有权限，如果没有，就会转发到登录页面，如果有权限，就会直接启动下载程序，给浏览器一个输出流。

下面直接上我的代码：

登录表单

<body>    <form id="form1" name="form1" method="post" action="login.action">        <p>            <label for="textfield">账号</label> <input type="text" name="username"                id="textfield" />        </p>        <p>            <label for="textfield2">密码</label> <input type="text" name="password"                id="textfield2" />        </p>        <p>            <input type="submit" name="button" id="button" value="提交" /> <br />        </p>    </form></body>

上传表单：

 <body><form action="upload.action" method="post" enctype="multipart/form-data" name="form1" id="form1">  <p>    <label for="fileField"></label>    <input type="file" name="fileobj" id="fileField" />  </p>  <p>    <input type="submit" name="button" id="button" value="提交" />    <br />  </p></form><a href="showpic.action">查看上传照片</a>  </body>

查看文件列表：

    <table cellspacing="5" align="center">        <tr>            <s:iterator value="#request.photoList" id="photo" status="stu">                <td><a                    href="downpic.action?inputFile=<s:property value="photo"/>"> <img                        src='images/<s:property value="photo"/>' width="400" height="420">                </a>                </td>        </tr>        <tr>            </s:iterator>        </tr>    </table>

下面是action部分：

package com.updown.Action;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.util.UUID;import org.apache.commons.io.FilenameUtils;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class UploadAction extends ActionSupport {private File fileobj;private String fileobjFileName;private String fileobjContentType;    /**     * @return     */    public String execute() throws Exception {        InputStream is = new FileInputStream(fileobj);        String photoPath = ServletActionContext.getServletContext()                .getRealPath("/images");        File filePhotoPath = new File(photoPath);        if (!filePhotoPath.isDirectory()) {            filePhotoPath.mkdir();        }        String extension = FilenameUtils.getExtension(this.getFileobjFileName());        String filename = UUID.randomUUID().toString() + "." + extension;        File tofile = new File(photoPath, filename);        OutputStream os = new FileOutputStream(tofile);        byte[] buffer = new byte[1024];        int length = 0;        while ((length = is.read(buffer)) > 0) {            os.write(buffer, 0, length);        }        is.close();        os.close();        return SUCCESS;    }    public File getFileobj() {        return fileobj;    }    public void setFileobj(File fileobj) {        this.fileobj = fileobj;    }    public String getFileobjFileName() {        return fileobjFileName;    }    public void setFileobjFileName(String fileobjFileName) {        this.fileobjFileName = fileobjFileName;    }    public String getFileobjContentType() {        return fileobjContentType;    }    public void setFileobjContentType(String fileobjContentType) {        this.fileobjContentType = fileobjContentType;    }}

package com.updown.Action;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class UserAction extends ActionSupport {private String username;private String password;    /**     * @return     */    public String execute() {        // TODO Auto-generated method stub        if (username.equals("admin")&&password.equals("admin")){        ServletActionContext.getRequest().getSession().putValue("user", "admin");        return SUCCESS;        }        return INPUT;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }}

package com.updown.Action;import java.io.File;import java.io.InputStream;import javax.servlet.http.HttpServletRequest;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class ShowPicAction extends ActionSupport {    private String inputFile;    private InputStream targetFile;public void setTargetFile(InputStream targetFile) {        this.targetFile = targetFile;    }public InputStream getTargetFile(){    return ServletActionContext.getServletContext().getResourceAsStream("/images/"+inputFile);}    /**     * @return     */    public String execute() {        String photoPath = ServletActionContext.getServletContext()                .getRealPath("/images");        File fphotoPath = new File(photoPath);        String[] photoList = fphotoPath.list();        HttpServletRequest request = ServletActionContext.getRequest();        request.setAttribute("photoList", photoList);        return SUCCESS;    }    public String downfile(){        String user = (String) ServletActionContext.getRequest().getSession().getAttribute("user");if (user!=null&&user.equals("admin"))        return SUCCESS;return LOGIN;    }    public String getInputFile() {        return inputFile;    }    public void setInputFile(String inputFile) {        this.inputFile = inputFile;    }}

struts-xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"><struts>    <package name="default" extends="struts-default">            <default-action-ref name="download"></default-action-ref>        <action name="login" class="com.updown.Action.UserAction">            <result name="success">/upload.jsp</result>            <result name="input">/login.jsp</result>        </action>        <action name="upload" class="com.updown.Action.UploadAction">            <result name="success">/upload.jsp</result>        </action>        <action name="showpic"            class="com.updown.Action.ShowPicAction">            <result name="success">/index.jsp</result>        </action>        <action name="downpic" class="com.updown.Action.ShowPicAction"            method="downfile">            <result name="success" type="stream">                <param name="contentType">                    application/octet-stream                </param>                <param name="inputName">targetFile</param>                <param name="bufferSize">4096</param>                <param name="contentDisposition">                    filename=&quot;download.file&quot;                </param>            </result>            <result name="login">/login.jsp</result>        </action></package></struts>

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