As far as I know, Spring Boot has two ways of passing arrays in request parameters:
- comma separated values, ex:
numbers=1,2,3,4,5 - repeated parameter name, ex:
numbers=1&numbers=2&numbers=3&numbers=4&numbers=5
In my example below, it first tries to convert an array using method 1. then after exception it successfully convert it using method 2.
My questions are:
is there any way to tell Spring Boot to use only method 2.?
Alternatively is there any way to escape commas in JSON string passed as request parameter of x-www-form-urlencoded content type?
DemoObject.class:
public class DemoObject {
private String name;
private String description;
private Integer count;
//Constructor, Getters and Setters
}
DemoController.class:
@RestController
public class DemoController {
@PostMapping("test")
String test(@RequestParam List<DemoObject> objects, @RequestParam Integer number) throws JsonProcessingException {
return "["+number +"] " +om.writerWithDefaultPrettyPrinter().writeValueAsString(objects);
}
}
DemoConverter.class:
@Component
public class DemoConverter implements GenericConverter {
private final ObjectMapper om = new ObjectMapper();
@Override
public Set<ConvertiblePair> getConvertibleTypes() {
Set<ConvertiblePair> convertibles = new HashSet<>();
convertibles.add(new ConvertiblePair(String.class, DemoObject.class));
return convertibles;
}
@Override
public Object convert(Object o, TypeDescriptor sourceType, TypeDescriptor targetType) {
try {
return om.readValue((String) o, targetType.getType());
} catch (JsonProcessingException ex) {
Logger.getLogger(DemoConverter.class.getName()).log(Level.SEVERE, null, ex);
throw new RuntimeException("Conversion failed");
}
}
}
Sample request 1.:
POST http://localhost:8080/test
Body x-www-form-urlencoded
objects:{"name":"test","description":"AAA"}
number:123
Spring Boot throws an exception:
com.fasterxml.jackson.core.io.JsonEOFException:
Unexpected end-of-input: expected close marker for Object
(start marker at [Source: (String)"{"name":"test""; line: 1, column: 1])
But result is correct with status 200 code.
Sample request 2.:
POST http://localhost:8080/test
Body x-www-form-urlencoded
objects:{"name":"test","description":"AAA"}
objects:{"name":"test2","description":"BBB"}
number:123
No exception, status 200, correct result.
Any help appreciated.
