form字符串和map的互相转换

package com.imooc.utils;

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

/**
 * @Author Changlin.Lin
 * @Date 2020/3/1 12:53
 **/
public class FormUtils {

    //hashMap转换成表单字符串
    public static String map2Form(HashMap<String,String> map){
        //StringBuilder和StringBuffer可以把任意类型数据放进字符串缓存区里面，并换回字符串缓冲区本身
        StringBuilder stringBuilder = new StringBuilder();

        if(map==null){
            return stringBuilder.toString();
        }else{
            //增强for遍历hashMap
            //Set<Map.Entry<String,String>> 键值对对象集合
            for(Map.Entry<String,String> entry : map.entrySet()){
                stringBuilder.append(entry.getKey()).append("=").append(entry.getValue()).append("&");
            }
            return stringBuilder.substring(0,stringBuilder.length()-1);
        }
    }

    //表单字符串转换成HashMap
    public static HashMap<String,String> form2Map(String formData){
        String[] params;
        HashMap<String,String> map = new HashMap<String, String>();

        //params按照&将每个键值对分割成字符串数组
        params = formData.split("&");

        //增强for遍历
        for(String s : params){
            String[] list = s.split("=");
            if(list.length>1){
                map.put(list[0],list[1]);
            }
        }
        return map;
    }


    //测试方法
    public static void main(String[] args){
        HashMap<String,String> map = new HashMap<String,String>();

        map.put("SerialNumber", "123456");
        map.put("Enable", "true");
        map.put("Bytes", "62bb");
        map.put("HashCode", "a9cf");

        System.out.println(map2Form(map));


        //测试Form字符串表单转换成map
        String strinfo = map2Form(map);
        HashMap<String,String> OutMap = form2Map(strinfo);
        System.out.println(OutMap);
    }
}

运行结果：