如何从HTTP响应中获取JSON值?

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英文:

how to get JSON value from HTTP response?

问题

以下是翻译好的部分:

"我想从HTTP请求中检索JSON文件的值。不幸的是,我不知道如何继续。
我正在使用GET方法:

CloseableHttpClient client = HttpClientBuilder.create().build();
HttpGet get = new HttpGet(new URI("http://localhost:3333/command/core/get-csrf-token"));
HttpEntity entity = client.execute(get).getEntity();

我确实获得了预期的文件,因为我尝试了:

return EntityUtils.toString(entity);

并获得输出:{"token":"myToken"}"

英文:

I would like to retrieve the value of a JSON file from an HTTP request. Unfortunately, I do not know how to proceed.
I am using the GET method:

CloseableHttpClient client = HttpClientBuilder.create().build();
HttpGet get = new HttpGet(new URI("http://localhost:3333/command/core/get-csrf-token"));
HttpEntity entity = client.execute(get).getEntity();

I do get the expected file as I tried:

return EntityUtils.toString(entity);

and get as output: {"token":"myToken"}

答案1

得分: 2

你可以将JSON字符串转换为JSONObject(来自org.json),然后使用getString()方法获取令牌。

JSONObject result = new JSONObject(EntityUtils.toString(entity));
String token = result.getString("token");

参考链接:http://stleary.github.io/JSON-java/org/json/JSONObject.html#JSONObject-java.lang.String-

英文:

You can convert JSON string into JSONObject( from org.json) and then get then token using getString() method

JSONObject result = new JSONObject(EntityUtils.toString(entity));
String token = result.getString("token"); 

Reference: http://stleary.github.io/JSON-java/org/json/JSONObject.html#JSONObject-java.lang.String-

答案2

得分: 0

试试

    JSONObject jsonObject = new JSONObject(EntityUtils.toString(entity));
    String token = jsonObject.getString("token");
英文:

try

JSONObject jsonObject = new JSONObject(EntityUtils.toString(entity));
String token = jsonObject.getString("token");

答案3

得分: -1

你可以简单地使用正则表达式(不需要额外的库)。

public static void main(String[] args){

	String json = "{\"token\":\"myToken\"}";

	System.out.println(extractToken(json));

}

public static String extractToken(String json){

	String regexToken = "(?:.*\"token\"\\s*:\\s*\")(?<token>.*?)(?:\".*)";
		
    Pattern patternToken = Pattern.compile(regexToken, Pattern.DOTALL);
    Matcher matcherToken = patternToken.matcher(json);
	
    if(matcherToken.matches()){
		return matcherToken.group("token");
	}else{
		return "token_not_found";
	}

}

这将在具有多个字段的 JSON 上工作。唯一的条件是整个 JSON 中只能有一个 token 字段。

英文:

You can simply use regex(don't need additional libs).

public static void main(String[] args){

	String json = &quot;{\&quot;token\&quot;:\&quot;myToken\&quot;}&quot;;

	System.out.println(extractToken(json));

}

public static String extractToken(String json){

	String regexToken = &quot;(?:.*\\\&quot;token\\\&quot;\\s*:\\s*\\\&quot;)(?&lt;token&gt;.*?)(?:\\\&quot;.*)&quot;;
		
    Pattern patternToken = Pattern.compile(regexToken, Pattern.DOTALL);
    Matcher matcherToken = patternToken.matcher(json);
	
    if(matcherToken.matches()){
		return matcherToken.group(&quot;token&quot;);
	}else{
		return &quot;token_not_found&quot;;
	}

}

This will work even on a json with multiple fields. The only condition is to be only one token field in the entire json.

huangapple
  • 本文由 发表于 2020年7月31日 22:56:48
  • 转载请务必保留本文链接:https://go.coder-hub.com/63194278.html
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