2019-02-07 java 8 lambda 将&

        String s = "abc=abc&bcd=bcd&def=def";
        Map<String, String> collect = Arrays.stream(s.split("&"))
                .map(str -> str.split("="))
                .collect(Collectors.toMap(x -> x[0], x -> x[1],
                        (u, v) -> {
                            throw new IllegalStateException(String.format("Duplicate key %s", u));
                        },LinkedHashMap::new));



        System.out.println(new Gson().toJson(collect););