通過MobileFirst Adapter下載PDF文件

Question

我正在構建一個應用程序，以從后端服務器下載PDF文件。 我寫了以下代碼：

在后端服務器上，方法如下：

        @POST
        @Consumes(MediaType.APPLICATION_JSON)
        @Produces("application/pdf")
        public Response download() {
                ResponseBuilder response = Response.ok((Object) new File("myFile.pdf"));
                response.header("Content-Disposition", "attachment; filename=myFile.pdf");
                Response responseBuilder = response.build();
                return responseBuilder;

        }

我從我的適配器調用此rest方法為：

function downloadFile(){
            var input = {
                    method              : 'post',
                    returnedContentType : "plain",
                    path                : "getfiles",
                    body                : {
                        contentType : 'application/json;charset=utf-8',
                        content     : JSON.stringify({username: "testuser"})
                    }

            };
            var response = WL.Server.invokeHttp(input);
            return response;
}

通話結束后，我從該服務獲得以下響應：

    {
       "errors": [
       ],
       "info": [
       ],
       "isSuccessful": true,
       "responseHeaders": {
          "Content-Disposition": "attachment; filename=myFile.pdf",
          "Content-Length": "692204",
          "Content-Type": "application\/pdf",
          "Date": "Thu, 15 Oct 2015 15:19:56 GMT",
          "X-Powered-By": "Servlet\/3.0"
       },
       "responseTime": 11,
       "statusCode": 200,
       "statusReason": "OK",
       "text":"%PDF-1.6\n%����\n159 0 obj\n<<\/Linearized 1\/L 692204\/O 162\/E 156949\/N 25\/T 691602\/H [ 531 579]>>\nendobj\n"
--long lines of characters in text field.
    }

我如何解析此響應為PDF文件並將其顯示給用戶？ 當我使用以下代碼從應用程序中簡單地調用此適配器方法時，當我右鍵單擊適配器並選擇運行為“調用移動適配器”時，也會收到此響應：

    var invocationData = {
            adapter : "MyAdapter",
            procedure: "downloadFile",
            parameters: []
    };


    WL.Client.invokeProcedure(invocationData, {
        onSuccess: downloadFileOK, 
        onFailure: downloadFileFAIL,
        onConnectionFailure: disconnectDetect
    });

我在瀏覽器的控制台上得到了相同的響應，但是正在調用“ OnFailure”方法“ downloadFileFAIL”。

編輯以下是正在瀏覽器COnsole中打印的日志：

R\n>>\nstartxref\n451945\n%%EOF","errors":[],"isSuccessful":true,"statusReason":"OK","responseHeaders":{"Date":"Thu, 15 Oct 2015 21:52:40 GMT","Content-Length":"453132","Content-Disposition":"attachment; filename=myFile.pdf","Content-Type":"application\/pdf","X-Powered-By":"Servlet\/3.0"},"warnings":[],"responseTime":15,"totalTime":151,"info":[]}
worklight.js:5356 Procedure invocation error.WL.Logger.__log @ worklight.js:5356
worklight.js:5360 Uncaught Exception: Uncaught SyntaxError: Unexpected number at (compiled_code):3879WL.Logger.__log @ worklight.js:5360
worklight.js:3879 Uncaught SyntaxError: Unexpected number
worklight.js:5992 Local storage capacity reached. WL.Logger will delete old logs to make room for new ones.
worklight.js:5356 Piggybacking event transmission
worklight.js:5356 Flush called

編輯2

以下是該項目及其資源的鏈接：

1. Java文件
2. PDF文件
3. MF項目

Answer 1

更新：

您面臨的問題是因為JS無法處理二進制數據。 最好的選擇是對base64后端服務器上的文件進行編碼，然后對base64上的文件進行解碼，然后再保存到文件中。 例如：

后端服務器：

在項目import org.apache.commons.codec.binary.Base64;您將需要一個額外的依賴項import org.apache.commons.codec.binary.Base64;

@POST
@Consumes(MediaType.APPLICATION_JSON)
@Produces("application/pdf")
public Response downloads() throws IOException {

    File file = new File("myFile.pdf");

    InputStream fileStream = new FileInputStream(file);

    byte[] data = new byte[1024];

    ByteArrayOutputStream buffer = new ByteArrayOutputStream();

    int read = 0;
    while ((read = fileStream.read(data, 0, data.length)) != -1) {
        buffer.write(data, 0, read);
    }

    buffer.flush();

    fileStream.close();

    ResponseBuilder response = Response.ok(Base64.encodeBase64(buffer.toByteArray()));
    response.header("Content-Disposition", "attachment; filename=myFile.pdf");
    Response responseBuilder = response.build();
    return responseBuilder;
}