Java 如何将哈希映射内容添加到文本文件

嗨，我有Hashmap内容作为

mapping :{[unknown, unknown, nicholas@123.com, nicholas@123.com, nicholas@123.com, WHEEL@123.com, WHEEL@123.com]=[STANDARD CHARTERED B, STANDARD CHARTERED B, DBS BANK LIMITED HON, DBS BANK LIMITED HON, DBS BANK LIMITED HON, DBS BANK (HONG KONG), DBS BANK (HONG KONG)], [unknown, unknown, nicholas@123.com, nicholas@123.com, nicholas@123.com, WHEEL@123.com, WHEEL@123.com]=[STANDARD CHARTERED B, STANDARD CHARTERED B, DBS BANK LIMITED HON, DBS BANK LIMITED HON, DBS BANK LIMITED HON, DBS BANK (HONG KONG), DBS BANK (HONG KONG)], [unknown, unknown, nicholas@123.com, nicholas@123.com, nicholas@123.com, WHEEL@123.com, WHEEL@123.com]=[STANDARD CHARTERED B, STANDARD CHARTERED B, DBS BANK LIMITED HON, DBS BANK LIMITED HON, DBS BANK LIMITED HON, DBS BANK (HONG KONG), DBS BANK (HONG KONG)], [unknown, unknown, nicholas@123.com, nicholas@123.com, nicholas@123.com, WHEEL@123.com, WHEEL@123.com]=[STANDARD CHARTERED B, STANDARD CHARTERED B, DBS BANK LIMITED HON, DBS BANK LIMITED HON, DBS BANK LIMITED HON, DBS BANK (HONG KONG), DBS BANK (HONG KONG)], [unknown, unknown, nicholas@123.com, nicholas@123.com, nicholas@123.com, WHEEL@123.com, WHEEL@123.com]=[STANDARD CHARTERED B, STANDARD CHARTERED B, DBS BANK LIMITED HON, DBS BANK LIMITED HON, DBS BANK LIMITED HON, DBS BANK (HONG KONG), DBS BANK (HONG KONG)], [unknown, unknown, nicholas@123.com, nicholas@123.com, nicholas@123.com, WHEEL@123.com, WHEEL@123.com]=[STANDARD CHARTERED B, STANDARD CHARTERED B, DBS BANK LIMITED HON, DBS BANK LIMITED HON, DBS BANK LIMITED HON, DBS BANK (HONG KONG), DBS BANK (HONG KONG)], [unknown, unknown, nicholas@123.com, nicholas@123.com, nicholas@123.com, WHEEL@123.com, WHEEL@123.com]=[STANDARD CHARTERED B, STANDARD CHARTERED B, DBS BANK LIMITED HON, DBS BANK LIMITED HON, DBS BANK LIMITED HON, DBS BANK (HONG KONG), DBS BANK (HONG KONG)]}

我想将其添加到文件中，作为其映射的唯一值

unknown STANDARD CHARTERED B
nicholas@123.com DBS BANK LIMITED HON
WHEEL@123.com DBS BANK (HONG KONG)

我的java代码如下

System.out.println("mapping :"+compIdmap);


            Iterator<Entry<ArrayList<String>, ArrayList<String>>> it = compIdmap.entrySet().iterator();

            while (it.hasNext()){
                Entry<ArrayList<String>, ArrayList<String>> line = it.next();
                String entryLine = line.getKey() + " -> " + line.getValue();
                br1.write(entryLine);
                }

System.out.println（“映射：+compIdmap”）；
迭代器it=compIdmap.entrySet（）.Iterator（）；
while（it.hasNext（））{
输入行=it.next（）；
字符串entryLine=line.getKey（）+“->”+line.getValue（）；
br1.写入（entryLine）；
}

它不是以映射格式编写的。。。正在添加1行hashmap。。我只希望将hashmap的唯一元素添加到文本文件中。

尝试以下操作：

创建另一个

HashMap

以添加唯一值

  HashMap<String, String> hashmap = new HashMap<String, String>();

``

---

对不起，预期的输出是什么？为什么不使用jackson/Gson等？

hashmap.put(keys[i], values[i]);

   Iterator<Entry<ArrayList<String>, ArrayList<String>>> it =  compIdmap.entrySet().iterator();
   HashMap<String, String> hashmap = new HashMap<String, String>();
   while (it.hasNext()) {
        Entry<ArrayList<String>, ArrayList<String>> line = it.next();
        String keys[] = line.getKey().split(",");
        String values[] = line.getValue().split(",");
        for (int i = 0; i < keys.length; i++) {
            hashmap.put(keys[i], values[i]);
        }
    }

   Iterator iterator = mp.entrySet().iterator();
   while (it.hasNext()) {
        Map.Entry pair = (Map.Entry)iterator.next();
        String entryLine=pair.getKey() + " = " + pair.getValue();
        br1.write(entryLine);
        //write  here in file ...........
    }
}