Arraylist to JSON string builder

Question

I have an arraylist like:

List skus = new ArrayList();

and the output is

[{value=4, sequence=1, availableinventory=50, defining=size, skuid=24846457, partnumber=602016000967318}, 
 {value=6, sequence=2, availableinventory=50, defining=size, skuid=24846459, partnumber=602016000967319}, 
 {value=8, sequence=3, availableinventory=50, defining=size, skuid=24846462, partnumber=602016000967320}, 
 {value=10, sequence=4, availableinventory=50, defining=size, skuid=24846468, partnumber=602016000967321}, 
 {value=12, sequence=5, availableinventory=50, defining=size, skuid=24846476, partnumber=602016000967322}, 
 {value=14, sequence=6, availableinventory=50, defining=size, skuid=24846484, partnumber=602016000967323}, 
 {value=16, sequence=7, availableinventory=50, defining=size, skuid=24846492, partnumber=602016000967324}]

But i want to convert the above arraylist to JSON response which is a string builder like below .

StringBuilder jsonUIRespesponse = new StringBuilder();

[{"skuid":"24845337","value":"16","partnumber":"602016000967240","availableinventory":"50","sequence":"7","defining":"size"},
{"skuid":"24845325","value":"6","partnumber":"602016000967235","availableinventory":"50","sequence":"2","defining":"size"},
{"skuid":"24845326","value":"8","partnumber":"602016000967236","availableinventory":"50","sequence":"3","defining":"size"},
{"skuid":"24845327","value":"10","partnumber":"602016000967237","availableinventory":"50","sequence":"4","defining":"size"},
{"skuid":"24845328","value":"12","partnumber":"602016000967238","availableinventory":"50","sequence":"5","defining":"size"},
{"skuid":"24845329","value":"14","partnumber":"602016000967239","availableinventory":"50","sequence":"6","defining":"size"},
{"skuid":"24845324","value":"4","partnumber":"602016000967234","availableinventory":"50","sequence":"1","defining":"size"}]

freedev · Accepted Answer · 2016-06-01 11:02:55Z

1

You can do this very easily with a mapper that converts from Java Objects into JSON constructs. I use Jackson but there are other implementations.

First be sure you have Jackson library in your Java project. If you're using Maven you have to add a dependency. Just to be clear, AFAIK does not exist in JDK a common Json serializer/deserializer, so you must add a library in your project, i.e. a reference implementation of JSR 353: Java API for JSON Processing

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.3.3</version>
</dependency>

Then you can convert Java Objects in Json with ObjectMapper utility class.

import com.fasterxml.jackson.databind.ObjectMapper;
...
ObjectMapper mapper = new ObjectMapper();
String jsonResponse = mapper.writeValueAsString(skus);

or append to a StringBuilder

StringBuilder sb = new StringBuilder();
sb.append(mapper.writeValueAsString(skus));

edited Jun 1, 2016 at 11:02

answered Jun 1, 2016 at 10:15

freedev

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9 Comments

Raga Over a year ago

I would want to append the sorted JSON values to jsonUIRespesponse (StringBuilder jsonUIRespesponse = new StringBuilder();) , So is there any other way without using Jackson. If so plz help

freedev Over a year ago

It is not clear how to sort json values. Your output example is not sorted. In any case, if you want a sorted json, I suggest to sort the java objects, I mean the values before the conversion.

Raga Over a year ago

Actually the sorted values are present in Arraylist "skus". So i just want to append the same order/values present in "skus" to stringbuilder "jsonUIRespesponse " , but i would want it as JSON format in stringbuilder "jsonUIRespesponse " (with double quotes and colon).

freedev Over a year ago

the writeValueAsString method just converts the Java objects in json, returning a string with double quotes and colons. Have you tried it?

Raga Over a year ago

i Could not use that because the import function is throwing error ."com.fasterxml cannot be resolved ". So could you pls tell me how do i use ObjectMapper without the import statement?

|

Sainik Kumar Singhal · Accepted Answer · 2016-06-01 10:16:23Z

0

You can use the Jackson Library.

  ObjectMapper OBJECT_MAPPER    = new ObjectMapper();

StringWriter stringWriter = new StringWriter();
     OBJECT_MAPPER.writeValue(stringWriter, YOUR_LIST);
    return stringWriter.toString();

answered Jun 1, 2016 at 10:16

Sainik Kumar Singhal

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