通过MobileFirst Adapter下载PDF文件

我正在构建一个从后端服务器下载PDF文件的应用程序。 我写了以下代码：

在Backend Server上，以下是方法：

@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; } 

我从我的适配器调用这个rest方法：

 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; } 

通话结束后，我收到以下来自此服务的回复：

  { "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<>\nendobj\n" --long lines of characters in text field. } 

如何将此响应解析为PDF文件并将其显示给用户？ 当我右键单击适配器并选择以“调用移动适配器”运行时，我正在收到此响应，当我只是使用以下代码从应用程序调用此适配器方法时：

  var invocationData = { adapter : "MyAdapter", procedure: "downloadFile", parameters: [] }; WL.Client.invokeProcedure(invocationData, { onSuccess: downloadFileOK, onFailure: downloadFileFAIL, onConnectionFailure: disconnectDetect }); 

我在浏览器的控制台上得到相同的响应，但我的“OnFailure”方法“downloadFileFAIL”正在被调用。

编辑以下是在浏览器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 

EDIT2

以下是项目及其资源的链接：

1. Java文件
2. PDF文件
3. MF项目

Answer 1

更新：

您面临的问题是因为JS无法处理二进制数据。 您最好的选择是在后端服务器上对文件进行base64编码，然后在保存到文件之前对应用程序中的文件进行base64解码。 例如：

后端服务器：

在项目import org.apache.commons.codec.binary.Base64;需要额外的依赖项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; }