Saturday, 12 October 2013

How to Create Pretty Print JSON using Jackson



In this Tutorials we are going to see how to create Pretty Print JSON using Jackson.

1. Create project called JSONExample.
2. Create package called com.javatutorialscorner.jackson 
3. Create java class called JacksonPojo under com.javatutorialscorner.jackson
JacksonPojo.java

package com.javatutorialscorner.jackson;

import java.util.List;

public class JacksonPojo {
private int id;
private String name;
private List<String> list;

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public List<String> getList() {
return list;
}

public void setList(List<String> list) {
this.list = list;
}

}

4. add jackson-mapper-asl-1.9.13.jar, jackson-core-asl-1.9.13.jar into build path.

5. Now Create java class called JacksonWriteExample under com.javatutorialscorner.jackson

JacksonWriteExample.java

package com.javatutorialscorner.jackson;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;

public class JacksonWriteExample {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
JacksonPojo pojo = null;
ObjectMapper mapper = null;
List<String> list = null;
try {
pojo = new JacksonPojo();
pojo.setId(10);
pojo.setName("Tendulkar");
list = new ArrayList<String>();
list.add("Test - 198 ");
list.add("ODI - 463 ");
list.add("T20 - 1");
list.add("IPL - 78");
pojo.setList(list);
mapper = new ObjectMapper();
mapper.defaultPrettyPrintingWriter().writeValue(new File("C:\\jtc\\javatutorialscorner.json"),
pojo);
System.out.println("JSON Pretty Print String - "
+ mapper.defaultPrettyPrintingWriter().writeValueAsString(pojo));
} catch (JsonGenerationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JsonMappingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}

Now run the program see the following output in console(Pretty Print JSON) and also JSON File created at specified location.

JSON Pretty Print String - {

  "id" : 10,

  "name" : "Tendulkar",

  "list" : [ "Test - 198 ", "ODI - 463 ", "T20 - 1", "IPL - 78" ]

}

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