JSON取值前判断
publicstaticvoidmain(String[]args)throwsException{
StringjsonStr1="{\"access_token\":\"OezXcEiiBSKSxW0eoylIeIVb08lFhyeFsq6cUJJNo8XYLoJjqYARJOZUrnqhfvnyMKOSjz5SHPHGUmt6f09_762MWQ0HLnZtffDPyD2A6TgCqWlZAEsHLhIaaQVYx1lywxOWQTrr7rX13i_w1INGnw\",\"expires_in\":7200,\"openid\":\"owYTUs68SXYX83wBvm_uN4Ya****\",\"scope\":\"snsapi_base\"}";
StringjsonStr2="{\"access_token\":\"OezXcEiiBSKSxW0eoylIeIVb08lFhyeFsq6cUJJNo8XYLoJjqYARJOZUrnqhfvnyMKOSjz5SHPHGUmt6f09_762MWQ0HLnZtffDPyD2A6TgCqWlZAEsHLhIaaQVYx1lywxOWQTrr7rX13i_w1INGnw\",\"expires_in\":7200,\"refresh_token\":\"OezXcEiiBSKSxW0eoylIeIVb08lFhyeFsq6cUJJNo8XYLoJjqYARJOZUrnqhfvnyuq9ojibRxolf9ElS7PSM0Kz1OTNlJ8ZKJl2BfbPi0LA-nQ9uNVUE8ujLFsdCeP79_L9FmIYcmHLXWXnl-fUsVg\",\"openid\":\"owYTUs68SXYX83wBvm_uN4Y****\",\"scope\":\"snsapi_base\"}";
JSONObjectjson1=JSONObject.fromObject(jsonStr1);
JSONObjectjson2=JSONObject.fromObject(jsonStr2);
Stringrefresh_token_1=null;
Stringrefresh_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:
null OezXcEiiBSKSxW0eoylIeIVb08lFhyeFsq6cUJJNo8XYLoJjqYARJOZUrnqhfvnyuq9ojibRxolf9ElS7PSM0Kz1OTNlJ8ZKJl2BfbPi0LA-nQ9uNVUE8ujLFsdCeP79_L9FmIYcmHLXWXnl-fUsVg