How to pass byte array as a parameter in Spring Rest API

Question

I am trying to pass few parameters, which includes byte[] as one, to a Rest Service. In the Service method when I consume the parameter and construct a File out of it ...I see a corrupted file. Below is my code:

public class MultiParameters {
    @JsonProperty(value="strName")
    public String strName;
    @JsonProperty(value="in")
    public byte[] in;
    public String strName2;


    public String getStrName2() {
        return strName2;
    }

    public void setStrName2(String strName2) {
        this.strName2 = strName2;
    }

    public String getStrName() {
        return strName;
    }

    public void setStrName(String strName) {
        this.strName = strName;
    }

    public byte[] getIn() {
        return in;
    }

    public void setIn(byte[] in) {
        this.in = in;
    }

RestController:

@RequestMapping(value= "/upload",  method = RequestMethod.POST)
public void upload(@RequestBody MultiParameters obj){           
    try {
        System.out.println("str name :  "+obj.getStrName());
        System.out.println("str name2 : "+obj.getStrName2());
        System.out.println("bytes lenghts : "+obj.getIn());

        FileOutputStream fos = new FileOutputStream(new File("D:\\Test.txt"));
        fos.write(obj.getIn());
        fos.close();
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

Can any one let me know what is the error over here?

I am testing my service by passing input as RAW Data in the form of JSON using Post Man.

Thanks.

public void setIn(byte[] in) Did you set the byte[] from this function ? & did u printed the size of obj.geIn before wrtiting? — Rajesh Gopu
– Rajesh Gopu, Commented Oct 21, 2016 at 10:00
one strange thing what I observed was..byte array which I am passing as an input is "5049504913104950491310504950131049501310495013104950" . When the control comes to service byte array contains "[-25, 78, 61, -25, 78, 61, -41, 125, 116, -29, -34, 116, -29, -35, 119, -41, 78, 116, -29, -34, 116, -41, 125, 116, -29, -34, 116, -41, 125, 116, -29, -34, 116, -41, 125, 116, -29, -34, 116]"..Input I am passing is getting corrupted or getting converted to another format set I guess. Am I correct? Any help in resolving this issue? — Raghav
– Raghav, Commented Oct 21, 2016 at 12:03

SHaaD · Accepted Answer · 2016-10-21 10:10:28Z

2

You can encode your byte array into Base64 string, then decode it back to byte array after receiving in controller.

answered Oct 21, 2016 at 10:10

SHaaD

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2 Comments

Raghav Over a year ago

I did the same already..but no luck..this is what I had done:

Raghav Over a year ago

@RequestMapping(value= "/byteUpload", method=RequestMethod.POST) public void getValues( @RequestParam(value="str1", required=true) String str1, @RequestParam(value="str2", required=true) String str2 ) { byte [] bytes=Base64.decodeBase64(str1); System.out.println(str1); System.out.println(str2); try{ FileOutputStream fos = new FileOutputStream(new File("D:\\Test.txt")); fos.write(bytes); fos.close(); } catch(Exception e) { } }

Naresh Joshi · Accepted Answer · 2016-10-21 11:00:04Z

1

By given code, I am guessing that you are trying to upload a file. If that is the case you can simply upload file and accept them in controller as mentioned in below example where we are accepting one customer object and one file object

@RequestMapping(value = "/registration/uploadFile", method = RequestMethod.POST)
public Customer saveFile(@RequestPart("customer") @Valid Customer customer, @RequestPart("file") @Valid MultipartFile file) {
    return customerService.saveFile(customer, file);
}

answered Oct 21, 2016 at 11:00

Naresh Joshi

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2 Comments

Raghav Over a year ago

Agree with you. But because of some limitation I am unable to use MultipartFile option. Thank you for your suggestion.

FigureCodeOut Over a year ago

Do you remember how you get to resolve this?

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