struts2 文件下载
struts2文件下载，想的复杂，实际上简单的你都想不到有那么简单
Action
package cn.luxh.struts2.action; import java.io.BufferedInputStream; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.InputStream; import java.io.UnsupportedEncodingException; import javax.servlet.http.HttpServletResponse; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionSupport; /** * 文件下载 * @author Luxh */ public class DownloadAction extends ActionSupport { //文件名 private String fileName;
private String inputPath; public String getFileName() { return fileName; } public void setFileName(String fileName) throws UnsupportedEncodingException { //用UTF-8重新编码文件名,解决中文乱码 this.fileName = new String(fileName.getBytes("ISO-8859-1"),"UTF-8"); }
public InputStream getInputStream() throws UnsupportedEncodingException, FileNotFoundException{
//attachment,以附件的方式下载文件,会打开保存文件对话框;inline,以内联的方式下载,浏览器会直接打开文件
HttpServletResponse response = ServletActionContext.getResponse(); response.setHeader("Content-Disposition", "attachment;fileName="+java.net.URLEncoder.encode(fileName,"UTF-8"));//java.net.URLEncoder.encode(fileName,"UTF-8") 编码转换，解决乱码 //如果fileName是相对路径 //return ServletActionContext.getServletContext().getResourceAsStream(inputPath); //如果fileName是绝对路径 return new BufferedInputStream(new FileInputStream(inputPath)); } @Override public String execute() throws Exception { return SUCCESS; }
public String getInputPath() {
return inputPath;
}
public void setInputPath(String inputPath) {
this.inputPath = inputPath;
}
}
struts.xml配置文件
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts> <package name="download" namespace="/download" extends="default"> <action name="download" class="cn.luxh.struts2.action.DownloadAction"> <result name="success" type="stream"> <!-- 下载文件类型定义 --> <param name="contentType">application/octet-stream</param> <!-- 下载文件输出流定义 --> <param name="inputName">inputStream</param><br> <span><!-- 下载文件处理方式 --> </span><br><span> <param name="contentDisposition">attachment;filename="${fileName}"</param></span> <!-- 下载文件的缓冲大小 --> <param name="bufferSize">4096</param> </result> </action> </package> </struts>
jsp
<a href="....action?inputPath=...fileName=...">下载</a>
总结：sturts2文件下载
Action：1.从jsp得到文件的路径以及文件名称
2.写一个返回InputStream的方法（按照绝对路径和相对路径有所不同）
相对路径：return ServletActionContext.getServletContext().getResourceAsStream(inputPath);
绝对路径：return new BufferedInputStream(new FileInputStream(inputPath));
3.execute方法（或者其他方法）都不用处理，只需要返回一个字符串就可以了
struts.xml：1.result的type是stream注意
2.在result里通过标签<param></param>配置contentType,inputName,burrerSize
jsp:就只负责传参数就可以了
多个文件下载
2、处理多个附件下载的Action。
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package cn.luxh.struts2.action;import java.io.File;import java.text.SimpleDateFormat;import java.util.Date;import cn.luxh.utils.ZipFileUtil;import com.opensymphony.xwork2.ActionSupport;/** * 处理多个附件下载 * @author Luxh */public class MultiFileDownloadAction extends ActionSupport { private static final long serialVersionUID = 2743077909387361587L; //接收JSP页面传递过来的附件的路径 private String attachmentPath; //最终压缩后的zip文件的路径，传递给通用的下载Action private String fileName; /** * 下载多个附件 * 实现：将多个附近压缩成zip包,然后再下载zip包 */ public String downloadMultiFile() { //使用当前时间生成文件名称 String formatDate =new SimpleDateFormat("yyyyMMddHHmmssSSS").format(new Date()); //压缩后的zip文件存放路径 fileName = "D:/test/" + formatDate + ".zip"; if(attachmentPath != null && !"".equals(attachmentPath)) { //将多个附件的路径取出 String[] attachmentPathArray = attachmentPath.split(","); if(attachmentPathArray != null && attachmentPathArray.length >0) { File[] files = new File[attachmentPathArray.length]; for(int i=0;i<attachmentPathArray.length;i++) { if(attachmentPathArray[i] != null) { File file = new File(attachmentPathArray[i].trim()); if(file.exists()) { files[i] = file; } } } //将多个附件压缩成zip ZipFileUtil.compressFiles2Zip(files,fileName); } } return SUCCESS; } public String getAttachmentPath() { return attachmentPath; } public void setAttachmentPath(String attachmentPath) { this.attachmentPath = attachmentPath; } public String getFileName() { return fileName; } public void setFileName(String fileName) { this.fileName = fileName; } } |
Action中的压缩文件类ZipFileUtil参考 http://www.cnblogs.com/luxh/archive/2012/06/28/2568758.html
配置文件：
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<!--将多个附件压缩后重定向到公共的下载Action下载文件 --> <action name="downloadMultiFile" class="cn.luxh.struts2.action.MultiFileDownloadAction" method="downloadMultiFile"> <result type="redirectAction"> <param name="actionName">download</param> <param name="nameSpace">/download</param> <!--附件的完整路径 --> <param name="fileName">${fileName}</param> </result> </action> |
3、附件列表展现的JSP页面。
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<%@ page contentType="text/html;charset=UTF-8" language="java"%><%@ taglib prefix="s" uri="/struts-tags"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><!DOCTYPE html><html> <head> <title>File Download</title> <meta http-equiv="description" content="error"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <!--<link rel="stylesheet" type="text/css" href="./styles.css">--> <script type="text/javascript" src="${pageContext.request.contextPath}/scripts/jquery-1.7.2.min.js"></script> <script type="text/javascript"> function checkFile() { if($("#all").attr("checked")){ $("input[name='attachmentPath']").attr("checked",true); }else { $("input[name='attachmentPath']").attr("checked",false); } } </script> </head> <body> <form action="${pageContext.request.contextPath}/index/downloadMultiFile" method="post"> <table> <tr> <th> <input type="checkbox" name="all" id="all" onchange="checkFile()">全选 </th> <th> 文件名 </th> <th> 文件路径 </th> <th> 下载 </th> </tr> <c:forEach items="${attachmentList}" var="attachment"> <tr> <td> <input type="checkbox" name="attachmentPath" value="${attachment.filePath}"> </td> <td>${attachment.fileName}</td> <td>${attachment.filePath}</td> <td> <a href="${pageContext.request.contextPath}/download/download?fileName=${attachment.filePath}">下载</a> </td> </tr> </c:forEach> </table> <tr> <td> <input type="submit" value="下载所选文件" id="submit"> </td> </tr> </form> </body></html> |
attachmentList是后台传过来的一个存放附件信息的List.
1、一个封装附件信息的实体Attachment。
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/** * 附件信息 */public class Attachment { private Integer id; //附件名称 private String fileName; //附件路径 private String filePath; //get set 方法 } |
2、在Action中查出附件信息，存放到List中。
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/** * 显示附件下载列表 */ public String showAttachmentList() { //从数据库中查找出附件信息 List<Attachment> attachmentList = attachmentService.getAllAttachments(); //将附件信息列表存放起来，在页面就可以获取到 ActionContext.getContext().put("attachmentList", attachmentList); return SUCCESS; } |
3、在页面就可以迭代attachmentList把附件信息展现出来了。
4、附件实体Attachment中存放有附件的路径filePath,将filePath传到下载Action就可以了。要注传的是绝对路径还是相对路径。
<a href="${pageContext.request.contextPath}/download/download?fileName=${attachment.filePath}">下载</a> 中的fileName=${attachment.filePath}就是将附件路径传给下载的Action
希望可以帮到你。
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