How to use Spring`s RestTemplate to POST an array of strings

Question

I am trying to post a simple array of strings using the spring`s restTemplate. Did anyone succeed with that ?

The client:

    public void save(){
        String company = "12345";
        String productId = "10";
        String[] colors = {"A","B","C","D","E"};
        String convertUrl = "http://localhost:8080/cool-web/save";
        MultiValueMap<String, Object> convertVars = new LinkedMultiValueMap<String, Object>();
        convertVars.add("companyID", StringUtils.trimToEmpty(company));
        convertVars.add("productId", StringUtils.trimToEmpty(productId));
        convertVars.add("disclaimer", StringUtils.trimToEmpty("ffs"));
        convertVars.add("colorsArray", colors); 
        restTemplate.postForObject(convertUrl, null, String.class, convertVars);
}

The Service is:

    @RequestMapping(value = "/save", method = RequestMethod.POST)
    @ResponseStatus(value = HttpStatus.OK)
    public void save(@RequestParam("colorsArray[]") String[] colors,
        @RequestParam("disclaimer") String disclaimer,
        @RequestParam("companyID") String companyID,
        @RequestParam("productId") String productId) {

    resourceService.save(colors, disclaimer, companyID, productId);
}

I got 400 Bad Request.

What am I doing wrong ?

I am using the default messageConverters.

Do I need to implement custom messageConverter for a simple array of Strings ?

MDelchev · Accepted Answer · 2014-12-25 10:38:39Z

6

Here is the solution:

public void save(){

    String company = "12345";
    String productId = "10";
    String[] colors = {"A","B","C","D","E"};
    String convertUrl = "http://localhost:8080/cool-web/save";

    MultiValueMap<String, Object> convertVars = new LinkedMultiValueMap<String, Object>();

    convertVars.add("companyID", StringUtils.trimToEmpty(company));
    convertVars.add("productId", StringUtils.trimToEmpty(productId));
    convertVars.add("disclaimer", StringUtils.trimToEmpty("ffs"));

    for(String color:colors){
        convertVars.add("colorsArray[]", color); 
    }

    restTemplate.postForObject(convertUrl, convertVars , String.class); 
}

answered Dec 25, 2014 at 10:38

MDelchev

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Comments

Jeevan Patil · Accepted Answer · 2014-12-25 06:11:08Z

1

If you are trying POST MultiValueMap, use Map.class instead of String.class in the code:

restTemplate.postForObject(convertUrl, null, Map.class, convertVars);

And your service method is wrong I guess. Because you are posting MultiValueMap and in save method you are trying to get all the internal variables as method parameters i.e. RequestParam. That's not going to happen. You will have to accept only MultiValueMap there and take things out of it for use.

public void save(@RequestParam("colorsArray[]") MultiValueMap<String, Object> convertVars ) {
    resourceService.save(convertVars.getColors(), .... );
}

answered Dec 25, 2014 at 6:11

Jeevan Patil

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1 Comment

MDelchev Over a year ago

String.class is the response type so it should not be Map.class. The map is used to build the request`s body so the service should not receive as an argument Map. Nevertheless I tried your suggestions it did not work.

Cuzz · Accepted Answer · 2014-12-25 06:12:37Z

0

@RequestParam(value) value - "The name of the request parameter to bind to." So @RequestParam("colorsArray[]") String[] colors trying to find param with name "colorsArray[]" but u put parameter with name "colorsArray". May be that is the reason.

answered Dec 25, 2014 at 6:12

Cuzz

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