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
– Nikolas, Commented Aug 24, 2018 at 20:32

1218985 · Accepted Answer · 2018-08-28 05:09:18Z

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, 2018 at 5:09

answered Aug 24, 2018 at 20:43

1218985

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1 Comment

John Seen Over a year ago

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.

Amardeep Bhowmick · Accepted Answer · 2018-08-24 20:48:04Z

1

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;
 }

edited Aug 24, 2018 at 20:48

answered Aug 24, 2018 at 20:42

Amardeep Bhowmick

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1 Comment

BartusZak Over a year ago

It returns Object parsed to string with {, / } chars e.g,: "{\"street\":\"scEEqbJsKXIhmdXzzjeXxvLlWSMCdz\",\"buildingNumber\":\"cDlmnRjhBJDyZcDgnb\",\"city\":\"f"

user666 · Accepted Answer · 2019-03-08 09:19:12Z

-1

You can use google gson library:

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

answered Mar 8, 2019 at 9:19

user666

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1 Comment

user666 Over a year ago

or reflection using apache lang

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