[英]How to print the following JSON to pretty format?
{ "firstName":"John", "lastName":"Doe" },
{ "firstName":"Anna", "lastName":"Smith" },
{ "firstName":"Peter", "lastName":"Jones" }
这是我的示例JSON,没有root标签。 如何获取整个JSON并在每一行上对其进行迭代,然后将其存储为Java中的String对象并解析为JSON对象? 我尝试了这段代码。
String file = "D:\\employees.json";
ObjectMapper mapper = new ObjectMapper();
String data = "";
data = new String(Files.readAllBytes(Paths.get(file)));
System.out.println(data);
Object json = mapper.readValue(data, employees.class);
System.out.println("JSON -> "+json);
String indented = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(json);
System.out.println(indented);
但是在这里,json变量仅保存文件的单行,但是我希望整个文件以漂亮的格式打印。 我怎样才能做到这一点 ? 这里的每一行都是一个单独的实体。
根据您在评论中的回答,我认为它应该起作用:
String file = "here file path";
ObjectMapper mapper = new ObjectMapper();
List<Object> employeeList = new ArrayList<>();
for (String line : Files.readAllLines(Paths.get(file))) {
employeeList.add(mapper.readValue(line, Object.class));
}
String indented = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(employeeList);
System.out.println(indented);
输出JSON如下所示:
[ {
"firstName" : "John",
"lastName" : "Doe"
}, {
"firstName" : "Anna",
"lastName" : "Smith"
}, {
"firstName" : "Peter",
"lastName" : "Jones"
} ]
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