如何使用jax-rs发送文件

import javax.ws.rs.core.Response;import javax.ws.rs.core.Response.ResponseBuilder;public Response getFile(String contentType) {        File f = new File("/tmp/file.doc");        ResponseBuilder response = Response.ok(f);        response.type(contentType);        response.header("Content-Disposition", "attachment; filename="file.doc"");        return response.build();    }