struts2文件下载 火狐浏览器的文件名乱码问题

这是一个文件下载的action，红色部分为火狐浏览器需要特地做的事情。

@Controller

@Scope(value = "prototype")

public class FormManage_downloadAction {



    private String fileName;//下载文件时候的名称

    private String filePath;//文件在磁盘的路径



    public String execute() throws UnsupportedEncodingException {

        System.out.println("下载action");

        System.out.println("fileName="+fileName);

        System.out.println("filePath="+filePath);



        HttpServletRequest request = ServletActionContext.getRequest();

        String Agent = request.getHeader("User-Agent");

        if (null != Agent) {

            Agent = Agent.toLowerCase();

            if (Agent.contains("firefox")) {

                System.out.println("火狐浏览器");

 fileName = new String(fileName.getBytes(), "iso8859-1");             } else {

                System.out.println("非火狐浏览器");

                fileName = URLEncoder.encode(fileName, "utf8");

            }

        }

        return "success";

    }



    public InputStream getInputStream() throws FileNotFoundException {

        return new FileInputStream(filePath);

    }



    public String getFileName() {

        return fileName;

    }



    public String getFilePath() {

        return filePath;

    }



    public void setFileName(String fileName) {

        this.fileName = fileName;

    }



    public void setFilePath(String filePath) {

        this.filePath = filePath;

    }

}