Question

嗨，当我使用下面的代码时，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);

现在，我想从项目中删除所有依赖项，因此我尝试从this link中使用此方法，但是由于键和值对中包含“（双引号），因此无法使用。：

    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(", "))+"}";

所以我尝试直接保存String命令，就像使用下面的代码从杰克逊罐子中使用ObjectMapper类之后那样，但这还是行不通的：

    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类后，Command变量的输出为：

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

我尝试通过jackson-databind github项目，但是在这个级别上，对于我来说太简单了。请让我知道我如何实现这一目标。

Answer 1

转义与反斜杠一起使用，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
}

不使用杰克逊就无法将哈希图转换为字符串

1 个答案: