XStream - Writing JSON using XStream

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XStream supports JSON by initializing XStream object with an appropriate driver. XStream currently supports JettisonMappedXmlDriver and JsonHierarchicalStreamDriver.

Let us now test the code with json handling in XStream.

Create a java class file named XStreamTester in C:\>XStream_WORKSPACE\com\howcodex\xstream.

File: XStreamTester.java

package com.howcodex.xstream;

import java.io.Writer;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.annotations.XStreamAlias;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.json.JsonHierarchicalStreamDriver;
import com.thoughtworks.xstream.io.json.JsonWriter;

public class XStreamTester {

   public static void main(String args[]) {

      XStreamTester tester = new XStreamTester();
      XStream xstream = new XStream(new JsonHierarchicalStreamDriver() {
      
         public HierarchicalStreamWriter createWriter(Writer writer) {
            return new JsonWriter(writer, JsonWriter.DROP_ROOT_MODE);
         }
      });

      Student student = new Student("Mahesh","Parashar");

      xstream.setMode(XStream.NO_REFERENCES);
      xstream.alias("student", Student.class);
      
      System.out.println(xstream.toXML(student));
   }
}

@XStreamAlias("student")
class Student {

   private String firstName;
   private String lastName;

   public Student(String firstName, String lastName) {
      this.firstName = firstName;
      this.lastName = lastName;
   }

   public String getFirstName() {
      return firstName;
   }

   public String getLastName() {
      return lastName;
   }   
	
   public String toString() {
      return "Student [ firstName: "+firstName+", lastName: "+ lastName+ " ]";
   }	
}

Verify the Result

Compile the classes using javac compiler as follows −

C:\XStream_WORKSPACE\com\howcodex\xstream>javac XStreamTester.java

Now run the XStreamTester to see the result −

C:\XStream_WORKSPACE\com\howcodex\xstream>java XStreamTester

Verify the output as follows −

{
   "firstName": "Mahesh",
   "lastName": "Parashar"
}
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