java - 如何用空格返回我的字符串值

Question

如何修改我的主类，以便我可以在不丢失空格的情况下接收值？

这是我的主要类(class)的一部分:

StringBuilder sb = new StringBuilder();
Scanner s = new Scanner(new FileReader(new File("C:/User/waithaka/Documents//duka.json")));
while (s.hasNext()) {
    sb.append(s.next());
}
s.close();

GsonBuilder gsonBuilder = new GsonBuilder();
Gson gson = gsonBuilder.create();

String jstring = sb.toString();
Result results = gson.fromJson(jstring, Result.class);
List<data> dat = response.getData();
for (data data : dat) {
    System.out.println("The item is " + data.getItem());
}

最后一行打印没有空格的值。例如，字符串 "Black and yellow" 的值将更改为 "Blackandyellow"。

Answer 1

如果查看 Scanner.java 类，您会发现空格被视为换行符。

public Scanner(InputStream source) {
        this(new InputStreamReader(source), WHITESPACE_PATTERN);
    }

您需要将行分隔符设置为

s.useDelimiter(System.getProperty("line.separator"));

我能够复制并解决问题，下面是代码 -

JSON

{
name:"Stack-overflow",
url:"http://www.stack-overflow   .com"
}

这是类

public class GsonTest {

    public static void main(String[] args) throws FileNotFoundException {
        StringBuilder sb = new StringBuilder();

        Scanner s = new Scanner(new FileReader(new File(
                "/Users/chatar/Documents/dev/projects/stack-overflow/stack-overflow/bin/C:/User/waithaka/Documents/duka.json")));

        s.useDelimiter(System.getProperty("line.separator"));
        while (s.hasNext()) {
            String nxt = s.next();
            sb.append(nxt);
        }
        s.close();

        GsonBuilder gsonBuilder = new GsonBuilder();
        Gson gson = gsonBuilder.create();

        String jstring = sb.toString();
        Result results = gson.fromJson(jstring, Result.class);

        System.out.println("The item is " + results);
    }
}