不使用傑克遜就無法將哈希圖轉換為字符串

Question

嗨，當我使用下面的代碼時，它工作正常：

Map<String, Object> commandParams = new HashMap<>();
commandParams.put("cmd", "Page.setDownloadBehavior");
Map<String, String> params = new HashMap<>();
params.put("behavior", "allow");
params.put("downloadPath", downloadPath);
commandParams.put("params", params);
HttpClient httpClient = HttpClientBuilder.create().build();

ObjectMapper objectMapper = new ObjectMapper();
String command = objectMapper.writeValueAsString(commandParams);

現在，我想從項目中刪除所有依賴項，因此我嘗試通過此鏈接使用此方法，但由於鍵和值對中包含“（雙引號）”，因此無法使用：

    Map<String, Object> commandParams = new HashMap<>();
    commandParams.put("cmd", "Page.setDownloadBehavior");
    Map<String, String> params = new HashMap<>();
    params.put("behavior", "allow");
    params.put("downloadPath", downloadPath);
    commandParams.put("params", params);
    HttpClient httpClient = HttpClientBuilder.create().build();

    String command ="{"+commandParams.entrySet().stream().map(e -> "\""+e.getKey() + "\"" + ":\"" + String.valueOf(e.getValue()) + "\"").collect(Collectors.joining(", "))+"}";

所以我嘗試直接保存String命令，就像使用下面的代碼從jackson jars中使用ObjectMapper Class之后那樣，但是這也不起作用：

    Map<String, Object> commandParams = new HashMap<>();
    commandParams.put("cmd", "Page.setDownloadBehavior");
    Map<String, String> params = new HashMap<>();
    params.put("behavior", "allow");
    params.put("downloadPath", downloadPath);
    commandParams.put("params", params);
    HttpClient httpClient = HttpClientBuilder.create().build();

    String command = "{\"cmd\":\"Page.setDownloadBehavior\",\"params\":{\"downloadPath\":\"C:\\\\Users\\\\I334253\\\\Downloads\\\\Test_Download\",\"behavior\":\"allow\"}}";

使用ObjectMapper類后，Command變量的輸出為：

{"cmd":"Page.setDownloadBehavior","params":{"downloadPath":"C:\\Users\\I334253\\Downloads\\Test_Download","behavior":"allow"}}

我嘗試通過jackson-databind github項目，但是在這個級別上，對於我來說太簡單了。 請讓我知道我如何實現這一目標。

Answer 1

轉義可以使用反斜杠，因此：

String command = commandParams.entrySet().stream()
    .map(e -> "\"" + escape(e.getKey()) + "\"" + ":\""
        + escape(String.valueOf(e.getValue())) + "\"")
    .collect(Collectors.joining(", ", "{", "}"));


static String escape(String s) {
    return s.replace("\\", "\\\\") // Single backslash
        .replace("\"", "\\\"");    // Double quote
}