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This is simple Zabbix API Client for Java. It's fork of original client https://github.com/hengyunabc/zabbix-api but with small changes in java version, dependencies, api contract, tests.

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package io.github.cgi.zabbix.api;

import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;


/**
 * Created by cgi on 01.03.2016.
 * Support Class for converting Objects to JSON
 */
public class Utils {
    static ObjectMapper mapper = new ObjectMapper();
    static ObjectMapper mapperIndent = new ObjectMapper();


    public static String toJson(Object o) {
        String s = null;
        try {
            s = mapper.writeValueAsString(o);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return s;

    }

    public static String toJsonWithIndent(Object o) {
        String s = null;
        mapperIndent.getSerializationConfig().enable(SerializationConfig.Feature.INDENT_OUTPUT);
        try {
            s = mapperIndent.writeValueAsString(o);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return s;

    }


    public static byte[] getBytesFromInputStream(InputStream inputStream) {

        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

        try{
        byte[] buffer = new byte[1024];
        int length;

        while ((length = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, length);
        }

        outputStream.flush();

        } catch (IOException e){
            e.printStackTrace();
        }

        return outputStream.toByteArray();
    }


    public static String inputStreamToString(byte[] bytes)  {

        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        String string = null;

        try {

            outputStream.write(bytes);
            string = outputStream.toString("UTF-8");

        } catch (IOException e) {
            e.printStackTrace();
        }

        return string;

    }

}