How to pass List or String array to getForObject with Spring RestTemplate

问题

I am developing some restful services with Spring. I have trouble with passing/getting string array or large string as parameters to my service controller. My code examples are like below;

Controller:

@RequestMapping(value="/getLocationInformations/{pointList}", method=RequestMethod.GET)
@ResponseBody
public LocationInfoObject getLocationInformations(@PathVariable("pointList") String pointList)
{
    // code block
}

Sample point list:

String pointList = "37.0433;35.2663,37.0431;35.2663,37.0429;35.2664,37.0428;35.2664,37.0426;35.2665,37.0424;35.2667,37.0422;35.2669,37.042;35.2671,37.0419;35.2673,37.0417;35.2674,37.0415;35.2674,37.0412;35.2672,37.0408;35.267,37.04;35.2667,37.0396;35.2665,37.0391;35.2663,37.0388;35.2662,37.0384;35.266,37.0381;35.2659,37.0379;35.2658,37.0377;35.2657,37.0404;35.2668,37.0377;35.2656,37.0378;35.2652,37.0378;35.2652,37.0381;35.2646,37.0382;35.264,37.0381;35.2635,37.038;35.263,37.0379;35.2627,37.0378;35.2626,37.0376;35.2626,37.0372;35.2627,37.0367;35.2628,37.0363;35.2628,37.036;35.2629,37.0357;35.2629,37.0356;35.2628,37.0356;35.2628,37.0355;35.2626";

Web service client code:

Map<String, String> vars = new HashMap<String, String>();
vars.put("pointList", pointList);

String apiUrl = "http://api.website.com/service/getLocationInformations/{pointList}";

RestTemplate restTemplate = new RestTemplate();
LocationInfoObject result = restTemplate.getForObject(apiUrl, LocationInfoObject.class, vars);

When I run client side application, it throws a HttpClientErrorException: 400 Bad Request, I think long location information string causes to this problem. So, how can I solve this issue? Or is it possible posting long string value as parameter to web service?

Thx all

回答1:

List or other type of objects can post with RestTemplate's postForObject method. My solution is like below:

controller:

@RequestMapping(value="/getLocationInformations", method=RequestMethod.POST)
@ResponseBody
public LocationInfoObject getLocationInformations(@RequestBody RequestObject requestObject)
{
    // code block
}

Create a request object for posting to service:

public class RequestObject implements Serializable
{
    public List<Point> pointList    = null;
}

public class Point 
{
    public Float latitude = null;
    public Float longitude = null;
}

Create a response object to get values from service:

public class ResponseObject implements Serializable
{
    public Boolean success                  = false;
    public Integer statusCode               = null;
    public String status                    = null;
    public LocationInfoObject locationInfo  = null;
}

Post point list with request object and get response object from service:

String apiUrl = "http://api.website.com/service/getLocationInformations";
RequestObject requestObject = new RequestObject();
// create pointList and add to requestObject
requestObject.setPointList(pointList);

RestTemplate restTemplate = new RestTemplate();
ResponseObject response = restTemplate.postForObject(apiUrl, requestObject, ResponseObject.class);

// response.getSuccess(), response.getStatusCode(), response.getStatus(), response.getLocationInfo() can be used

回答2:

Firstly you've passed a map as parameters but your controller expects these as a path variable. All you need to do is make the 'pointlist' value part of the URL (without the curly bracket placeholders). e.g.:-

http://api.website.com/service/getLocationInformations/pointList

Next you need to ensure you have message converters set up so that your LocationInfoObject is marshalled into an appropriate representation (suggest JSON) and unmarshalled the same way.

For the Rest template:

restTemplate.setMessageConverters(...Google MappingJackson2HttpMessageConverter...);

For the server you just need to add Jackson to the classpath (if you want multiple representations you'd need to configure each one manually - Google will be your friend here aswell.

来源：https://stackoverflow.com/questions/22507129/how-to-pass-list-or-string-array-to-getforobject-with-spring-resttemplate

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java

Spring

web-services

resttemplate