1. 今天和IOS安卓做對接的時候忽然發現了一個錯誤，就是屬性一致  資料型別不一致 查了半天才發現錯誤時資料庫為NULL 到底怎麼回事呢，原來安卓和IOS無法識別NULL，所以我再為NULL的時候直接給屬性拼接成了空字串，但是有資料的時候是int,無資料的時候是String,這就尷尬了，然後找了半天我也沒找到解決辦法最後一狠心 自己寫了一套，直接呼叫底層封裝了一個方法，接下來上乾貨

2. 程式碼

 public static String toJsonStringLi(String str){
        char[] chars = str.toCharArray();
        StringBuffer stringBuffer1 = new StringBuffer();//冒號的下標
        StringBuffer stringBuffer2 = new StringBuffer();//逗號的下標
        StringBuffer stringBuffer3 = new StringBuffer();// }的下標
        for(int i =0;i<chars.length;i++){
            String s = String.valueOf(chars[i]);
            if(s.equals(":")){
                stringBuffer1.append(i);
                stringBuffer1.append(",");
            }
        }
        for(int i =0;i<chars.length;i++){
            String s = String.valueOf(chars[i]);
            if(s.equals(",")){
                stringBuffer2.append(i);
                stringBuffer2.append(",");
            }
        }
        for(int i =0;i<chars.length;i++){
            String s = String.valueOf(chars[i]);
            if(s.equals("}")){
                stringBuffer3.append(i);
                stringBuffer3.append(",");
            }
        }
        String[] ins1 = stringBuffer1.toString().split(",");
        String[] ins2 = stringBuffer2.toString().split(",");
        String[] ins3 = stringBuffer3.toString().split(",");
        int l = 0;
        for (int i=0;i<ins1.length;i++){
            int w = Integer.valueOf(ins1[i])+1;
            int b = Integer.valueOf(ins1[i])+2;
            String t = str.substring(w+l,b+l);
            if(!t.equals("\"")){
                StringBuffer stringBuffer= new StringBuffer(str);
                stringBuffer.insert(w+l,"\"");
                str = stringBuffer.toString();
                l++;
            }
            if(ins2.length>i){
                w = Integer.valueOf(ins2[i])-1;
                b = Integer.valueOf(ins2[i]);
                t = str.substring(w+l,b+l);
                if(!t.equals("\"")){
                    StringBuffer stringBuffer= new StringBuffer(str);
                    str = stringBuffer.insert(b+l,"\"").toString();
                    l++;
                }
            }
        }
        for (int i=0;i<ins3.length;i++){
            int w = Integer.valueOf(ins3[i])-1;
            int b = Integer.valueOf(ins3[i]);
            String t = str.substring(w+l,b+l);
            if(!t.equals("\"")){
                StringBuffer stringBuffer= new StringBuffer(str);
                str = stringBuffer.insert(b+l,"\"").toString();
                l++;
            }
        }
       return str;
    }
 

效果

  public static void main(String[] args) throws Exception {
        Map<String, Integer> map = new HashMap<String, Integer>();
        map.put("aa", 111);
        map.put("bb", 222);
        map.put("cc", 333);
        map.put("dd",44444);
        String str = JsonUtil.toJson(map);
        System.out.println(str);
        System.out.println(toJsonStringLi(str));
    }
 

{"aa":111,"bb":222,"cc":333,"dd":44444}
{"aa":"111","bb":"222","cc":"333","dd":"44444"}

不要問我註釋為什麼不清楚，因為我要下班了，有問題直接找我就行

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