spring mvc output in json format

Question

I am very new for spring mvc and java. i want to return a json data instead of string

@RequestMapping(value = "/ex/foos", method = RequestMethod.GET, produces = "application/json")
@ResponseBody
public String getFoosAsJsonFromREST() {
    return "{\"name\":\"MyNode\", \"width\":200, \"height\":100}";
}

actual output:
"{\"name\":\"MyNode\", \"width\":200, \"height\":100}"

output i want:
{"name":"MyNode", "width":200, "height":100}

i followed the link but i still can't get literal json output

@RequestMapping(value = "/ex/foos", method = RequestMethod.GET, produces = "application/json") @ResponseBody public JsonNode getFoosAsJsonFromREST() {

  String everything = "{\"a\":2,\"b\":\"astring\",\"c\":6}";
  ObjectMapper mapper = new ObjectMapper();
  JsonNode node = mapper.readTree(everything);
  return node;
}

output { "result": false, "message": "Unexpected end-of-String when base64 content\n at [Source: N/A; line: -1, column: -1]" }

possible duplicate of Return literal JSON strings in spring mvc @ResponseBody — kryger

fillup fillup · Accepted Answer · 2015-09-02T01:10:19

You're nearly there :)

JSON is just an object format so you must return an object with key:value pairs.

@RequestMapping(value = "/ex/foos", method = RequestMethod.GET, produces = "application/json")
@ResponseBody
public MyJSONRespone getFoosAsJsonFromREST() {
  MyJSONRespone myResponse = new MyJSONRespone();
  myResponse.setName("MyNode");
  myResponse.setWidth(200);
  myResponse.setHeight(100);        
  return myResponse;
}

class MyJSONRespone{

  private String name;

  private Integer width;

  private Integer Height;

  //setters and getters

}

Also make sure you have the correct dependency in your POM if you are using Maven:

    <!-- Jackson/JSON START -->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-annotations</artifactId>
        <version>2.4.2</version>
    </dependency>

    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>2.4.2</version>
    </dependency>

    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.4.2</version>
    </dependency>
    <!-- Jackson/JSON END -->

spring mvc output in json format

1 Answers