[英]Accepting formatted Json (multi-line) input from user in a Java console app with Scanner (all lines not being read)
I have a scenario where I need to take formatted Json (multi-line) as an input and do something with it. 我有一种情况,我需要将格式化的Json(多行)作为输入并对其进行处理。 I figured doing it in a simple console app would be good since it is just a tool I am creating and want it to be able to be ran locally.
我认为在一个简单的控制台应用程序中进行操作会很好,因为它只是我正在创建的工具,并且希望能够在本地运行。 If I should be reading the Json from a file instead please let me know.
如果我应该从文件中读取Json,请告诉我。
The plan is to have the user paste something like this into a console application and then type "exit". 计划是让用户将类似这样的内容粘贴到控制台应用程序中,然后键入“ exit”。
{
"section1":{
"line1":0.3456,
"line2":{
"line3":45345,
"line4":67567
},
"section2":{
"line6":867867,
"line7":0.16767
},
"section3":{
"line9":9977,
"line10":0.76867
},
"array1":[
{
"ghjf":"1111",
"ggeeaaa":678769,
"ghj":0.6799789
}
]
}
}
exit
A couple of things are happening: 有几件事正在发生:
1. The first { is not being recognized so I need to manually insert it. 1.第一个{无法识别,因此我需要手动将其插入。
2. Several lines are not being read... ie "line1" is getting skipped and many more. 2.几行未读...即“ line1”被跳过,还有更多行。
Here is my code: 这是我的代码:
System.out.println("Enter a valid JSON string: ");
Scanner scanner = new Scanner(System.in);
StringBuilder sb = new StringBuilder();
while (!scanner.nextLine().equals("exit")) {
sb.append(scanner.nextLine());
}
sb.insert(0, "{");
String formattedJson = sb.toString()
.replaceAll("\\t","").replaceAll("\\s", "");
// Do something with formattedJson further in code...
You are calling scanner.nextLine() twice, but only use the value once. 您两次调用scanner.nextLine(),但仅使用一次该值。
Try declaring it as a variable and only calling nextLine() once: 尝试将其声明为变量,并且只调用一次nextLine():
Scanner scanner = new Scanner(System.in);
StringBuilder sb = new StringBuilder();
String line;
while (!(line = scanner.nextLine()).equals("exit")) {
sb.append(line);
}
As a result, you probably won't need (should remove) this: 结果,您可能不需要(应该删除):
sb.insert(0, "{");
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.