Question

我有一个用HttpResponseMessage返回文件的代码，我想添加联系人字符串，我该怎么做？

[HttpPost]
public IHttpActionResult GetPlaylistXml(int playlistId, [FromBody] JObject data)
{
    ....
    var serializer = new XmlSerializer(typeof(playList));
    using (var memStream = new MemoryStream())
    {
        serializer.Serialize(memStream, playList);

        var result = new HttpResponseMessage(HttpStatusCode.OK)
        {
            Content = new ByteArrayContent(memStream.ToArray(), 0, (int)memStream.Length)
        };
        result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
        {
            FileName = playlist.Title + ".xml"
        };
        result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");

        var response = ResponseMessage(result);

        return response;
    }
}

Answer 1

根据您的偏好以及可能基于现有平台的限制，有几种选择：

选项1

您可以按原样保留代码并从流中读取文件并从标题中读取文件名（我个人推荐这个，除非有一些限制阻止您这样做）

选项2

创建一个模型并以json格式返回：

import org.junit.Test;
import com.google.gson.*;
import static org.junit.Assert.*;

public class JsonTest {

    private JsonObject parse(@Nonnull String json) throws JsonSyntaxException {
        JsonElement res = new JsonParser().parse(json);
        System.out.println(res);
        if (!res.isJsonObject()) {
            throw new JsonSyntaxException("Top level JSON object required");
        }
        return res.getAsJsonObject();
    }

    private static void assertThrows(Runnable r) {
        try {
            r.run();
            fail();
        } catch (JsonSyntaxException expected) {
            // ok
        }
    }

    @Test
    public void testIt() {
        assertThrows(() -> parse(""));
        assertThrows(() -> parse("null"));
        assertThrows(() -> parse("Abracadabra"));
        assertThrows(() -> parse("[]"));
        assertTrue(parse("{}").entrySet().isEmpty());
        assertThrows(() -> parse("{a: }"));
        assertThrows(() -> parse("{a: ,}"));
        assertThrows(() -> parse("{a: 0,}"));
        assertTrue(parse("{a: null}").get("a").isJsonNull());
        assertEquals(0, parse("{a: 0}").get("a").getAsInt());
        assertEquals("", parse("{a: ''}").get("a").getAsString());
        assertEquals("", parse("{a: \"\"}").get("a").getAsString());
        assertEquals(0, parse("{a: []}").get("a").getAsJsonArray().size());
        //assertThrows(() -> parse("{a: [1,]}")); // TODO: this parses without error to {"a":[1,null]}
    }

}

选项3

使您的端点更像REST，并有两个端点，一个用于检索有关播放列表的信息，另一个用于检索播放列表文件：

[HttpPost]
public IHttpActionResult GetPlaylistXml(int playlistId, [FromBody] JObject data)
{
    ....
    var serializer = new XmlSerializer(typeof(playList));
    using (var memStream = new MemoryStream())
    {
        serializer.Serialize(memStream, playList);

        var returnModel = new 
        {
           Title = playList.Title,
           // either a byte array (which is converted to Base64, or the XML string)
           Playlist = memStream.ToArray() 
        };

        return Json(returnModel);
    }
}

我希望这会有所帮助。

如何添加到HttpResponseMessage文件和字符串

1 个答案:

选项1

选项2

选项3