<!------------文件名：DownLoadAction.java ------------------>
import java.io.InputStream;
import java.io.UnsupportedEncodingException;

import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class DownLoadAction extends ActionSupport {
    //下载文件原始存放路径
    private final static String DOWNLOADFILEPATH="/upload/";
    //文件名参数变量
    private String fileName;

    public String getFileName() {
        return fileName;
    }

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

    //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(DOWNLOADFILEPATH+fileName);
    }
    //如果下载文件名为中文，进行字符编码转换
    public String getDownloadChineseFileName() {
        String downloadChineseFileName = fileName;

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

        return downloadChineseFileName;
    }

    public String execute() {
        return SUCCESS;
    }
}