webwork 文件下载

webwork做文件下载:
首先在[color=red]xwork.xml[/color]中添加以下内容

<action name="download" class="com.mycompany.action.FileDownloadAction"> 
			<result name="success" type="stream"> 
				<param name="contentType">application/octet-stream</param> 
				<param name="inputName">inputStream</param> 
				<param name="contentDisposition">attachment;filename="${downloadFileName}"</param> 
				<param name="bufferSize">4096</param> 
			</result> 
		</action> 

这时需要把fileName作为参数传过来.
以下是action.

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;

import com.opensymphony.xwork.Action;

public class FileDownloadAction implements Action {

	private String fileName = "";

	public InputStream getInputStream () throws Exception {
		InputStream is = null;
		try {
			is = new FileInputStream(fileName);
		} catch (FileNotFoundException e1) {
		}
		return is;
	}

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

	public void setFileName (String fileName) {
		this.fileName = fileName;
	}

	public String getFileName () {
		return fileName;
    }

	public String getDownloadFileName () {
		String downFileName = fileName;
		try {
			downFileName = new String(downFileName.getBytes(), "utf8");
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return downFileName;
	}
}