java json与map互相转换的示例

public static void main(String[] args) {
  JSONObject jo = new JSONObject();
  jo.put("method_code", "JMJKK0101");
  jo.put("identifier", "000000000000");
  jo.put("timestamp", "");
  jo.put("version", "Ver1.1");
  jo.put("area_code", "00000000");
  jo.put("access_type", "0");
  jo.put("access_id", "0101010101");
  jo.put("complete_key", "HMACSHA1");
  jo.put("complete_str", "摘要加密字符串");
  jo.put("param_key", "AES");
  jo.put("param_set", "请求业务参数加密字符串"); 
  // json-->Map
  Map<String, Object> map = jo.toMap();
  System.out.println(map);
  // Map-->json
  JSONObject jo2 = new JSONObject(map);
  System.out.println(jo2);
}

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.Map.Entry;
import org.apache.log4j.Logger;
import net.sf.json.JSONObject;

/**
 * JSON数据处理工具类
 * @explain
 * @author Marydon
 * @creationTime 2018年7月16日上午11:45:35
 * @version 1.0
 * @since
 * @email marydon20170307@163.com
 */
public class JsonUtils {
  
  private static Logger log = Logger.getLogger(JsonUtils.class);
}

/**
 * 将JSONObject转换成无序Map
 * @explain
 * @param jsonObject
 * @return HashMap 无序Map
 */
public static Map<String, Object> toHashMap(JSONObject jsonObject) {
    // 用于存储接收到的key:value
    Map<String, Object> data = new HashMap<String, Object>();
    // 获取json对象中的键
    @SuppressWarnings("unchecked")
    Set<String> keySet = jsonObject.keySet();
    String key = "";
    Object value = null;
    // 遍历jsonObject数据，添加到Map对象
    for (Iterator<String> iterator = keySet.iterator(); iterator.hasNext();) {
        key = iterator.next();
        value = jsonObject.get(key);
        data.put(key, value);
    }
    log.info("JSONObject-->HashMap：" + data);
    return data;
}

/**
 * 将JSONObject转换成升序Map
 * @explain 将参数按照第一个字符的键值 ASCII 码递增排序（字母升序排序），如果遇到相同字符则按照第二个字符的键值 ASCII 码递增排序，
 *          以此类推通过SortedMap可以实现
 * @param jsonObject
 * @return SortedMap 按ASCII码升序排列
 */
public static Map<String, Object> toSortedMap(JSONObject jsonObject) {
    // 用于存储接收到的key:value，并按key以ASCII码进行升序排列组合
    SortedMap<String, Object> data = new TreeMap<String, Object>();
    // 获取json对象中的键
    @SuppressWarnings("unchecked")
    Set<String> keySet = jsonObject.keySet();
    String key = "";
    Object value = null;
    // 遍历json数据，添加到SortedMap对象
    for (Iterator<String> iterator = keySet.iterator(); iterator.hasNext();) {
        key = iterator.next();
        value = jsonObject.get(key);
        data.put(key, value);
    }
    log.info("JSONObject-->SortedMap：" + data);
    return data;
}

public static void main(String[] args) {
  Map<String, Object> map = new HashMap<String, Object>();
  map.put("method_code", "JMJKK0101");
  map.put("identifier", "000000000000");
  map.put("timestamp", "");
  map.put("version", "Ver1.1");
  map.put("area_code", "00000000");
  map.put("access_type", "0");
  map.put("access_id", "0101010101");
  map.put("complete_key", "HMACSHA1");
  map.put("complete_str", "摘要加密字符串");
  map.put("param_key", "AES");
  map.put("param_set", "请求业务参数加密字符串");
  // Map-->json
  JSONObject jo = JSONObject.fromObject(map);
  System.out.println(jo);
  // json-->HashMap
  Map<String, Object> hashMap = JsonUtils.toHashMap(jo);
  System.out.println(hashMap);
  // json-->SortedMap
  Map<String, Object> sortedMap = JsonUtils.toSortedMap(jo);
  System.out.println(sortedMap); 
}