struts2多文件动态下载及中文解决方案

package com.xxx.base.view.action;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import com.ruizcon.base.util.MyException;

public class DownloadAction extends BaseAction {
private String fileName;

private String relativePath;
public void setFileName(String fileName) throws UnsupportedEncodingException {
/*
* 对fileName参数进行UTF-8解码,注意:实际进行UTF-8解码时会使用本地编码。
* 这里使用request.setCharacterEncoding解码无效.
* 只有解码了getDownloadFile()方法才能在下载目录下正确找到请求的文件
* */
String str=new String(fileName.getBytes("ISO8859-1"),"utf-8");
this.fileName=str;
}
/**
* @getFileName
* 此方法对应的是struts.xml文件中的：
* <param >attachment;filename="${fileName}"</param>
* 这个属性设置的是下载工具下载文件时显示的文件名，
* 要想正确的显示中文文件名，我们需要对fileName再次编码
* 否则中文名文件将出现乱码，或无法下载的情况
* @return
* @throws UnsupportedEncodingException
* @author XieYanZhou(Yan)
* @date 2011-6-1
* @version v1.0
*/
public String getFileName() throws UnsupportedEncodingException{
String str= new String(fileName.getBytes(), "ISO8859-1");
return  str;
}
public void setRelativePath(String relativePath) throws UnsupportedEncodingException {
//this.relativePath = relativePath;
String str=new String(relativePath.getBytes("ISO8859-1"),"utf-8");
this.relativePath=str;
}
/**
*
* @getDownloadFile
* 此方法的命名是有规定的,对应的是struts.xml文件中的：
* <param >downloadFile</param>
* 返回下载文件的流，可以参看struts2的源码
* @return
* @author XieYanZhou(Yan)
* @date 2011-6-1
* @version v1.0
*/
public InputStream getDownloadFile(){
/*String baseRealPath=this.getSession().getServletContext().getRealPath("");
String path = baseRealPath + relativePath + "//" + this.fileName;
path=path.replaceAll("/", "////");
FileInputStream fis = new FileInputStream(path);
return fis;*/
return this.getServletContext().getResourceAsStream(relativePath +"/"+ fileName);
}

@Override
public String execute() throws Exception {
return SUCCESS;
}

}

<action name="downloadAction" class = "downloadAction">
<result name="success" type="stream">
<!-- <param name="contentType">application/excel,application/vnd.ms-excel</param> -->
<param name="contentDisposition">attachment;filename="${fileName}"</param>
<param name="inputName">downloadFile</param>
<param name="bufferSize">4096</param>
</result>
</action>