Map和String互相转换

Map to String

import java.util.Arrays;
import java.util.Map;
import java.util.Set;

public class GetMapToString {
    public static String getMapToString(Map map) {
        Set keySet = map.keySet();
        //将set集合转换为数组
        String[] keyArray = keySet.toArray(new String[keySet.size()]);
        //给数组排序(升序)
        Arrays.sort(keyArray);
        //因为String拼接效率会很低的，所以转用StringBuilder
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < keyArray.length; i++) {
            // 参数值为空，则不参与签名 这个方法trim()是去空格
            if ((String.valueOf(map.get(keyArray[i]))).trim().length() > 0) {
                sb.append(keyArray[i]).append(":").append(String.valueOf(map.get(keyArray[i])).trim());
            }
            if (i != keyArray.length - 1) {
                sb.append(",");
            }
        }
        return sb.toString();
    }
}

String to Map

import java.util.HashMap;
import java.util.Map;

public class GetStringToMap {

    public static Map getStringToMap(String str){
        //根据逗号截取字符串数组
        String[] str1 = str.split(",");
        //创建Map对象
        Map map = new HashMap();
        //循环加入map集合
        for (int i = 0; i < str1.length; i++) {
            //根据":"截取字符串数组
            String[] str2 = str1[i].split(":");
            //str2[0]为KEY,str2[1]为值
            map.put(str2[0],str2[1]);
        }
        return map;
    }

}