Struts2文件下载（基于注解）

除了Struts2需要的核心包外，还需要导入

1. commons-fileupload.jar
2. commons-io.jar

public class DownLoad extends BaseAction{
    private static final long serialVersionUID = 1L;
    private InputStream attachstream ;  // 文件输入流
    private String attachname ;//文件名
    private String path;//文件路径


    @Action(value = "/Download",
            results = {@Result(name = "success", type = "stream", 
                    params = {
                    "contentType", "application/octet-stream",
                    "inputName", "attachstream",
                    "contentDisposition", "attachment;filename=\"${attachname}\"",
                    "bufferSize", "4096"
            })})
    public String downloadFile(){
        try {
            path = new String(path.getBytes("ISO-8859-1"),"UTF-8");
            attachstream = new FileInputStream(ServletActionContext.getServletContext().getRealPath(path)) ;
            //attachstream = new FileInputStream(path);
            String []attachnames =path.split("/");
            attachname = attachnames[attachnames.length - 1];
        } catch (Exception e) {
            e.printStackTrace();
        }
        return SUCCESS;

    }
    /**
    *省略了getter、setter方法
    *
    **/
}

BaseAction

public class BaseAction extends ActionSupport implements SessionAware, RequestAware,ServletResponseAware {
    private static final String PROJECT_NAME = "/tjcrm";
    private static final long serialVersionUID = -8757701205867627690L;
    protected Map session;
    protected Map request;
    protected HttpServletResponse response;

    public static String getProjectName() {
        return PROJECT_NAME;
    }

    public void setRequest(Map request) {
        this.request = request;
    }

    public void setSession(Map session) {
      this.session = session;
    }

    public void setServletResponse(HttpServletResponse response) {
        this.response = response;
    }

    public HttpServletResponse getResponse() {
        return response;
    }

    public void setResponse(HttpServletResponse response) {
        this.response = response;
    }


}