Struts 2.18文件下载 Ie6下出错解决办法

package com.company.action;

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

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.convention.annotation.Result;
import org.apache.struts2.convention.annotation.Results;

import com.opensymphony.xwork2.Action;

@Results( { @Result(name = "success", type = "stream", params = {
        "contentType", "application/x-msdownload", "inputName", "inputStream",
        "contentDisposition", "attachment;filename=%{url}", "bufferSize",
        "5120" }) })
public class DownAction implements Action {

    // 文件地址
    private String url;

    public InputStream getInputStream() throws Exception {
        InputStream inputStream = ServletActionContext.getServletContext()
                .getResourceAsStream(url);
        return inputStream;
    }

    /****
     * 默认执行下载文件
     */
    public String execute() throws Exception {
        return SUCCESS;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        // 进行中文转码
        try {
            url = new String(ServletActionContext.getRequest().getParameter(
                    "url").getBytes("iso-8859-1"), "UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        this.url = url;
    }

}