struts2文件下载

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

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class FileDown extends ActionSupport{

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	
	
	private String filename;

	
	public String getFilename() throws UnsupportedEncodingException {
		return new String(filename.getBytes(), "iso8859-1");
	}
	public void setFilename(String filename) {
		this.filename = filename;
	}
	
	public InputStream getInputStream() throws Exception {
		filename="java.xlsx";
		return ServletActionContext.getServletContext().getResourceAsStream("/upload/"+filename);
	}
	
	
}

struts.xml

<action name="filedownload" class="com.java111.FileDown">
	       	<result name="success" type="stream">
		       	<param name="contentDisposition">attachment;filename=${filename }</param>
		       	<param name="location">main.jsp</param>
	       	</result>
</action