JSON取值前判断

前端技术 2023/09/06 JavaScript

复制代码 代码如下:

public static void main(String[] args)throws Exception{
     String jsonStr1=\"{\\\"access_token\\\":\\\"OezXcEiiBSKSxW0eoylIeIVb08lFhyeFsq6cUJJNo8XYLoJjqYARJOZUrnqhfvnyMKOSjz5SHPHGUmt6f09_762MWQ0HLnZtffDPyD2A6TgCqWlZAEsHLhIaaQVYx1lywxOWQTrr7rX13i_w1INGnw\\\",\\\"expires_in\\\":7200,\\\"openid\\\":\\\"owYTUs68SXYX83wBvm_uN4Ya****\\\",\\\"scope\\\":\\\"snsapi_base\\\"}\";   
    String jsonStr2=\"{\\\"access_token\\\":\\\"OezXcEiiBSKSxW0eoylIeIVb08lFhyeFsq6cUJJNo8XYLoJjqYARJOZUrnqhfvnyMKOSjz5SHPHGUmt6f09_762MWQ0HLnZtffDPyD2A6TgCqWlZAEsHLhIaaQVYx1lywxOWQTrr7rX13i_w1INGnw\\\",\\\"expires_in\\\":7200,\\\"refresh_token\\\":\\\"OezXcEiiBSKSxW0eoylIeIVb08lFhyeFsq6cUJJNo8XYLoJjqYARJOZUrnqhfvnyuq9ojibRxolf9ElS7PSM0Kz1OTNlJ8ZKJl2BfbPi0LA-nQ9uNVUE8ujLFsdCeP79_L9FmIYcmHLXWXnl-fUsVg\\\",\\\"openid\\\":\\\"owYTUs68SXYX83wBvm_uN4Y****\\\",\\\"scope\\\":\\\"snsapi_base\\\"}\";   
    JSONObject json1=JSONObject.fromObject(jsonStr1);
    JSONObject json2=JSONObject.fromObject(jsonStr2);
    String refresh_token_1=null;
    String refresh_token_2=null;
    if(json1.containsKey(\"refresh_token\")){
        refresh_token_1=json1.getString(\"refresh_token\");
    }
    if(json2.containsKey(\"refresh_token\")){
        refresh_token_2=json2.getString(\"refresh_token\");
    }
   
    System.out.println(refresh_token_1);
    System.out.println(refresh_token_2);
}

运行结果:

复制代码 代码如下:

null
OezXcEiiBSKSxW0eoylIeIVb08lFhyeFsq6cUJJNo8XYLoJjqYARJOZUrnqhfvnyuq9ojibRxolf9ElS7PSM0Kz1OTNlJ8ZKJl2BfbPi0LA-nQ9uNVUE8ujLFsdCeP79_L9FmIYcmHLXWXnl-fUsVg

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