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Struts2实现文件下载

2016-06-06 00:46 239 查看
index.jsp

<a href="resource/getCoursewareAction">下载课件</a>

showCoursewareList.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>下载课件</title>
</head>
<body>
<h1>课件列表</h1>
<%
int i = 0;
%>
<table border="1">
<tr>
<th>序号</th>
<th>文件名</th>
<th>下载次数</th>
<th>上传时间</th>
<!-- 删除操作，只有老师可见 -->
<th>删除课件</th>
</tr>
<s:iterator value="#request.CoursewareList" id="courseware">
<tr>
<td><%=++i%></td>
<td><a
href="downloadAction?fileName=<s:property value="#courseware.name"/>"><s:property
value="#courseware.name" /></a></td>
<td><s:property value="#courseware.downloadTimes" /></td>
<td><s:property value="#courseware.uploadDate" /></td>
<!-- 删除课件的操作，只有老师可见 ,暂时先全部显示出来，之后用session判断用户角色是什么-->
<td><a href="deleteCoursewareAction?coursewareId=<s:property value="#courseware.Rid"/>">删除</a></td>
</tr>
</s:iterator>
</table>
<s:debug></s:debug>
</body>
</html>


ResourceAction.java（接上一篇文件上传，这里给出ResourceAction.java的所有代码）
package edu.fzu.softwareengineer.courseSite.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.Date;
import java.util.List;
import java.util.Map;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

import edu.fzu.softwareengineer.courseSite.domain.Resource;
import edu.fzu.softwareengineer.courseSite.service.StudentService;
import edu.fzu.softwareengineer.courseSite.service.TeacherService;

public class ResourceAction extends ActionSupport {
/**
*
*/
private static final long serialVersionUID = 1L;

private List<File> upload;
private List<String> uploadContentType;
private List<String> uploadFileName;
private long maximumSize;
private String allowedTypes;
private Integer coursewareId;

private final String COURSEWARE = "courseware";
private final String HOMEWORK = "homework";

private Resource resource;
private TeacherService teacherService;
private StudentService studentService;

// 下载的文件名
private String fileName;
// 输入流
private InputStream inputStream;

// 老师上传课件
public String uploadCourseware() throws Exception {
// TODO Auto-generated method stub
uploadFile("D:\\temp\\", "teacher");
return "success";
}

// 学生上传作业
public String uploadHomework() {
ActionContext.getContext().getSession().put("user", "student");
uploadFile("D:\\homework\\", "student");
return SUCCESS;
}

// 学生得到课件的列表
public String getCourseware() {
List<Resource> list = studentService.getCourseware();
// System.out.println("list:" + list.size() + "--" + list.toString());
Map coursewareMap = (Map) ActionContext.getContext().get("request");
coursewareMap.put("CoursewareList", list);
return "showCoursewareList";
}

// 得到作业的列表
public String getHomework() {
List<Resource> list = teacherService.getHomeworks();
// System.out.println("list:" + list.size() + "--" + list.toString());
Map coursewareMap = (Map) ActionContext.getContext().get("request");
coursewareMap.put("HomeworkList", list);
return "showHomeworkList";
}

// 删除课件
public String deleteCourseware() {
teacherService.deleteCourseware(coursewareId);
return getCourseware();
}

// 得到流,给用户下载
public InputStream getInputStream() {
try {
System.out.println("role=="+ActionContext.getContext().getSession().get("user").toString());
if ((ActionContext.getContext().getSession().get("user").toString()).equals("student"))
inputStream = new FileInputStream("D:\\temp\\" + fileName);
if ((ActionContext.getContext().getSession().get("user").toString()).equals("teacher"))
inputStream = new FileInputStream("D:\\homework\\" + fileName);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
// e.printStackTrace();
System.err.println("文件没有找到");
}

if (fileName != null) {
try {
fileName = URLEncoder.encode(fileName, "UTF-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
System.out.println("转码失败！！！");
e.printStackTrace();
}
}
if (inputStream == null) {
System.out.println("getResource error!");
}
System.out.println("FileName : " + fileName);
return inputStream;
}

@Override
public String execute() throws Exception {
System.out.println("fileName==" + fileName);
return SUCCESS;
}

// 上传文件公共代码
public void uploadFile(String path, String user) {
for (int i = 0; i < upload.size(); i++) {
String savePath = path + uploadFileName.get(i);
FileOutputStream fos = null;
FileInputStream fis = null;
try {
fos = new FileOutputStream(savePath);
fis = new FileInputStream(upload.get(i));
byte[] buffer = new byte[1024];
int len = 0;
while ((len = fis.read(buffer)) > 0) {
fos.write(buffer, 0, len);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
fos.close();
fis.close();
upload.get(i).delete();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
resource = new Resource();
resource.setName(uploadFileName.get(i));
resource.setPath(savePath);
resource.setUploadDate(new Date());
resource.setDownloadTimes(0);
if (user.equals("teacher")) {
resource.setType(COURSEWARE);
teacherService.uploadCourseware(resource);
} else if (user.equals("student")) {
resource.setType(HOMEWORK);
studentService.uploadHomework(resource);
}
}
}

public long getMaximumSize() {
return maximumSize;
}

public void setMaximumSize(long maximumSize) {
this.maximumSize = maximumSize;
}

public String getAllowedTypes() {
return allowedTypes;
}

public void setAllowedTypes(String allowedTypes) {
this.allowedTypes = allowedTypes;
}

public Resource getResource() {
return resource;
}

public void setResource(Resource resource) {
this.resource = resource;
}

public TeacherService getTeacherService() {
return teacherService;
}

public void setTeacherService(TeacherService teacherService) {
this.teacherService = teacherService;
}

public StudentService getStudentService() {
return studentService;
}

public void setStudentService(StudentService studentService) {
this.studentService = studentService;
}

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

public String getFileName() {
return this.fileName;
}

public List<File> getUpload() {
return upload;
}

public void setUpload(List<File> upload) {
this.upload = upload;
}

public List<String> getUploadContentType() {
return uploadContentType;
}

public void setUploadContentType(List<String> uploadContentType) {
this.uploadContentType = uploadContentType;
}

public List<String> getUploadFileName() {
return uploadFileName;
}

public void setUploadFileName(List<String> uploadFileName) {
this.uploadFileName = uploadFileName;
}

public void setInputStream(InputStream inputStream) {
this.inputStream = inputStream;
}

public Integer getCoursewareId() {
return coursewareId;
}

public void setCoursewareId(Integer coursewareId) {
this.coursewareId = coursewareId;
}

}


struts.xml

<!-- 资源相关 -->
<package name="resource" namespace="/resource" extends="struts-default">

<action name="upload*Action" class="resourceAction" method="upload{1}">
<!-- 文件拦截器 -->
<interceptor-ref name="fileUpload">
<!-- 单个文件的大小 -->
<param name="maximumSize ">10000000</param>
<param name="allowedTypes">application/octet-stream,application/vnd.ms-powerpoint,application/msword</param>
</interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>

<result name="success" type="redirect">/index.jsp</result>
<result name="input">/error.jsp</result>
<result name="error">/error.jsp</result>
</action>

<action name="downloadAction" class="resourceAction">
<!-- 设置一个stream类型的result -->
<result name="success" type="stream">
<param name="contentType">application/octet-stream,application/vnd.ms-powerpoint,application/msword</param>
<param name="contentDisposition">attachment;filename="${fileName}"</param>
<param name="inputName">inputStream</param>
<param name="buffserSize">4096</param>
</result>
</action>

<action name="*Action" class="resourceAction" method="{1}">
<result name="showCoursewareList">/showCoursewareList.jsp</result>
<result name="showHomeworkList">/showHomeworkList.jsp</result>
</action>
</package>
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