Question

我是一个非常简单的用例，其中，我需要上传一个jpeg＆amp;从rest api下载pdf。我面临下面提到的问题＆amp;我尽了最大的努力（据我所知）试图从SO＆amp; S中获得解决方案。谷歌，但我还没有成功。

问题：

sendPdf方法确实发送了多个数据片段（通过运行pkt嗅探器确认）但我在游乐场中的代码收到的响应为nil。用例，但没有白费：

1尝试content-type = application / pdf 2尝试content-type = application / octet-stream
SaveFile方法确实创建了文件即。 img_1＆amp; img_2，但是图片查看器无法打开照片，这意味着在将字节流重新编译为pdf时会出现一些不匹配的比特。用例，但没有白费：

1尝试过DataInputStream 2与ByteArrayInputStream一起尝试ImageIO功能

休息api：

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        createOutput(request, response);
    }

    private void createOutput(HttpServletRequest request, HttpServletResponse response)  {
        PrintWriter out_response = null;
        response.setHeader("Cache-Control", "no-cache");
        saveFile(request);
        sendPdf(response);
    }

    private void sendPdf(HttpServletResponse response) throws IOException {

        //response.setContentType("application/pdf"); 
        response.setContentType("application/octet-stream");
        FileInputStream fin = new FileInputStream("C:\\Users\\dwalia\\Desktop\\abc.pdf");  
      if(fin !=null){
        BufferedInputStream bin = new BufferedInputStream(fin);  
        BufferedOutputStream bout = new BufferedOutputStream(response.getOutputStream());  
        int ch =0;  
        while((ch=bin.read())!=-1)  
        {  
            bout.write(ch);  
        }  
        bin.close();  
        fin.close();  
        bout.close();
      }
    }

    private void saveFile(HttpServletRequest request) {

        byte[] data = new byte[0];
        byte[] buffer = new byte[512];
        int bytesRead;

        try {
            DataInputStream din = new DataInputStream(request.getInputStream());
            while ((bytesRead = din.read(buffer)) > 0) {
                byte[] newData = new byte[data.length + bytesRead];
                System.arraycopy(data, 0, newData, 0, data.length);
                System.arraycopy(buffer, 0, newData, data.length, bytesRead);
                data = newData;
            }
            FileOutputStream fos = new FileOutputStream("C:\\Users\\dwalia\\Desktop\\img_1.png");
            fos.write(data);
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }  

        try {
            BufferedImage img = ImageIO.read(new ByteArrayInputStream(data));
            File outputfile = new File("C:\\Users\\dwalia\\Desktop\\img_2.png");
            if(img != null) ImageIO.write(img, "png", outputfile);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

My xcode playground code (SRWeb library : https://github.com/sraj/Swift-SRWebClient):

1. Trying to upload a png & download a pdf in a single go :

var image_src = UIImage(named : "India")
var params = ["username":"uname", "password":"pwd"]
var img_data = UIImageJPEGRepresentation(image_src, 100)

SRWebClient.POST("http://169.254.54.114:8080/sample/hello_world_servlet")
                 .data(img_data, fieldName: "signature", data: params)
                 .send(
                       {(response:AnyObject!, status:Int) -> Void in
                            println(status) <-- 200                       
                            if let response_json: AnyObject = response {
                                println(response as! String) <-- nothing, response == nil
                            }
                       }
                      )

2. Trying to download pdf only :

SRWebClient.GET("http://169.254.54.114:8080/sample/hello_world_servlet",
    success:{
        (response:AnyObject!, status:Int) -> Void in
        println("\(status) \(response)") <-- "Data nil"

        if let response_data: AnyObject = response {
            println(response_data) <-- nothing, response == nil
        }
    }, failure:{
        (error:NSError!) -> Void in
        println(error.localizedDescription) <-- nothing
    }
)

上传jpeg＆amp;下载pdf - swift +休息

0 个答案: