File download of struts2

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;



public class MyFileDownloadAction extends ActionSupport {
    private static final long serialVersionUID = 1L;
    public static Logger log = Logger.getLogger(MyFileDownloadAction.class);
    private String fileName = null;// 显示的文件名
    private String path = null;// 要下载文件的路径
    public HttpServletRequest request = ServletActionContext.getRequest();
    public HttpServletResponse response = ServletActionContext.getResponse();
    
    public String execute() throws Exception {
        fileName = request.getParameter("fileName");
        path = request.getParameter("path");
        InputStream is = null;
        try {
            is = new FileInputStream(path);
        } catch (FileNotFoundException e) {
            log.error("文件不存在：" + fileName);
            return INPUT;
        }
        response.setContentType("application/octet-stream");
        response.setHeader("Content-Disposition", "attachment;filename="
                + fileName);
        OutputStream out = response.getOutputStream();
        int b = 0;
        while ((b = is.read()) != -1) {
            out.write(b);
        }
        is.close();
        out.close();
        return NONE;
    }

    public String getFileName() {
        try {
            // 解决下载文件中文文件名问题
            fileName = new String(fileName.getBytes(), "ISO-8859-1");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return fileName;
    }

    
    
}

Configuration file

</action>
        <action name="myFileDownloadAction" class="包名.MyFileDownloadAction">
        </action>