struts2上载

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.convention.annotation.Result;
import org.apache.struts2.convention.annotation.Results;
import org.springframework.beans.factory.annotation.Autowired;

import com.dhhc.cs.oa.service.common.AttachmentManager;
import com.dhhc.cs.oa.web.action.BaseAction;
/**
 * @category 下载附件  Action
 * @version 1.0
 * @author yoyang
 * @company eqcms
 * @Date 2010-9-29
 */
@SuppressWarnings("serial")
@Results({ @Result(name = "success", type = "stream", params = { "contentType",
		"application/octet-stream", "inputName", "inputStream",
		"contentDisposition", "attachment;filename=\"${fileName}\"" }) })
public class DownloadAction extends BaseAction {
	@Autowired
	private AttachmentManager attachmentManager;;
    
	private Long id;

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

	public InputStream getInputStream() throws Exception {

		FileOutputStream out = null;
		try {
			out = new FileOutputStream(getTmpDir() + "/" + getFileName());
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if (out != null)
					out.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

		return new FileInputStream(getTmpDir() + "/" + getFileName());
	}

	public String getFileName() {
		return attachmentManager.get(id).getName();
	}

	public String getTmpDir() {
		String uploadDir = ServletActionContext.getServletContext()
				.getRealPath("/resources/tmp");
		File dirPath = new File(uploadDir);
		if (!dirPath.exists()) {
			dirPath.mkdirs();
		}
		return uploadDir;
	}

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

}

 使用struts2标准的方式,返回页面一个输出流