文件上载struts2

文件下载struts2

第一步：struts2文件下载 xml配置

?

<action name="download"
??? ??? ??? type="stream">
??? ??? ??? ??? <!-- 类型-->
??? ??? ??? ??? <param name="contentType">text/plain</param>
??? ??? ??? ??? <!-- 前台链接参数 -->
??? ??? ??? ??? <param name="contentDisposition">
??? ??? ??? ??? ??? attachment;filename="${downloadChineseFileName}"
??? ??? ??? ??? </param>
??? ??? ??? ??? <!--? -->
??? ??? ??? ??? <param name="inputName">downloadFile</param>
??? ??? ??? </result>
??? ??? ??? <result name="downloaderror" type="chain">
??? ??? ??? ??? showResList
??? ??? ??? </result>
??? ??? </action>

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第二步： 类的实现

package action.netDiskAction;

import java.io.File;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

/**
?* 个人中心资源问答下载附件实现
?*
?* @author huyt
?*
?*/
public class DownloadAction extends ActionSupport {

??? private String fileName; // 文件名和文件路径

??? private String newFileName; // 用于下载后显示的文件名

??? private boolean isExists; // 用户判断文件是否存在

??? private int toPage; // 下载资源所在的当前页面

??? // 从下载文件原始存放路径读取得到文件输出流
??? public InputStream getDownloadFile() {

??? ??? return ServletActionContext.getServletContext().getResourceAsStream(
??? ??? ??? ??? "/" + fileName);
??? }

??? // 如果下载文件名为中文，进行字符编码转换
??? public String getDownloadChineseFileName() {

??? ??? String downloadChineseFileName = newFileName;

??? ??? try {
??? ??? ??? downloadChineseFileName = new String(downloadChineseFileName
??? ??? ??? ??? ??? .getBytes(), "ISO8859-1");
??? ??? } catch (UnsupportedEncodingException e) {
??? ??? ??? e.printStackTrace();
??? ??? }

??? ??? return downloadChineseFileName;
??? }

??? public String execute() {

??? ??? String basePath = ServletActionContext.getServletContext().getRealPath(
??? ??? ??? ??? "");
??? ??? String filePath = basePath + fileName;
??? ??? File file = new File(filePath);
??? ??? if (!file.exists()) {

??? ??? ??? HttpServletRequest request = ServletActionContext.getRequest();
??? ??? ??? request.setAttribute("message", "文件已经不存在，请联系管理员！");

??? ??? ??? // 如果topage为0时，说明在第一页，需要进行重新设置为1
??? ??? ??? if (toPage == 0) {
??? ??? ??? ??? toPage = 1;
??? ??? ??? }

??? ??? ??? return "downloaderror";

??? ??? } else {
??? ??? ??? return SUCCESS;
??? ??? }
??? }

??? public String getFileName() {
??? ??? return fileName;
??? }

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

??? public String getNewFileName() {
??? ??? return newFileName;
??? }

??? public void setNewFileName(String newFileName) {
??? ??? this.newFileName = newFileName;
??? }

??? public int getToPage() {
??? ??? return toPage;
??? }

??? public void setToPage(int toPage) {
??? ??? this.toPage = toPage;
??? }

}