Convert Java Object to String in SpringBoot JPA Method

Question

I am working on Springboot MySQL example(Similar example). In one of the methods, I want to log JSON data but I am getting,

com.example.employee.model.Employee@1595ddd2

@RequestMapping(value="/employees12/{id}", method=RequestMethod.GET)
public Employee getPerson(@PathVariable Long id){
    Employee employee = employeeRepository.findOne(id);
    //String str=employee.toString();
    //System.out.println("string is " + str);
    System.out.println(employee); //print json in logs console
    return employee;
}

The return employees; is giving JSON data. I have tried toString(), even that doesnt work. Any help is appreciated.

@Reimeus: This is not a correct link to duplicate. I think this question should not be closed at all. The OP is definitely aware of how `System.out::println` and `Object::toString` works. He needs to log the outgoing JSON response. Please consider reopening the question. — Nikolas Charalambidis, Aug 24 '18 at 20:32

1218985 · Accepted Answer · 2018-08-28T05:09:18.953

6

You can use writerWithDefaultPrettyPrinter from ObjectMapper. This enables pretty print.

private ObjectMapper mapper = new ObjectMapper();

@RequestMapping(value="/employees12/{id}", method=RequestMethod.GET)
public Employee getPerson(@PathVariable Long id){
    Employee employee = employeeRepository.findOne(id);
    System.out.println(mapper.writerWithDefaultPrettyPrinter().writeValueAsString(employee));
    return employee;
}

If you want the output just in compact mode, use writeValueAsString

System.out.println(mapper.writeValueAsString(employee));

edited Aug 28 '18 at 05:09

answered Aug 24 '18 at 20:43

1218985

7,531
2
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Thanks for the solution, it is working as expected. I am a non-Java guy and was searching for a solution for the last couple of hours. I did not know about this ObjectMapper PrettyPrinter concept. – John Seen Aug 24 '18 at 20:56

Fullstack Guy · Answer 2 · 2018-08-24T20:48:04.293

In the getPerson() method, use objectMapper.writeValueAsString() to get the JSON of the employee object:

@RequestMapping(value="/employees12/{id}", method=RequestMethod.GET)
public Employee getPerson(@PathVariable Long id){
    Employee employee = employeeRepository.findOne(id);
    ObjectMapper objectMapper = new ObjectMapper();
    System.out.println(objectMapper.writeValueAsString(employee));
    return employee;
}

Adding a toString() in Employee class, with the ObjectMapper from Jackson to serialize the Employee instance. The advantage of overriding the toString() method in the Employee class is you can just do System.out.println(employee); anywhere to get the JSON representation of the Employee object.

 public String toString(){
     String serialized ="";
        try{
            ObjectMapper objectMapper = new ObjectMapper();
            serialized = objectMapper.writeValueAsString(this);
        }catch(JsonProcessingException jpe){
            jpe.printStackTrace();
        }
    return serialized;
 }

It returns Object parsed to string with `{`, `/` `}` chars e.g,: `"{\"street\":\"scEEqbJsKXIhmdXzzjeXxvLlWSMCdz\",\"buildingNumber\":\"cDlmnRjhBJDyZcDgnb\",\"city\":\"f"` — BartusZak, Mar 21 '22 at 21:31

score -1 · Answer 3 · answered Mar 08 '19 at 09:19

-1

You can use google gson library:

    @Override
public String toString() {
    return new GsonBuilder().setPrettyPrinting().create().toJson(this);
}

answered Mar 08 '19 at 09:19

user666

1,750
3
18
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or reflection using apache lang – user666 Mar 08 '19 at 09:19

Convert Java Object to String in SpringBoot JPA Method

3 Answers3