[英]How to print the following JSON to pretty format?
{ "firstName":"John", "lastName":"Doe" },
{ "firstName":"Anna", "lastName":"Smith" },
{ "firstName":"Peter", "lastName":"Jones" }
這是我的示例JSON,沒有root標簽。 如何獲取整個JSON並在每一行上對其進行迭代,然后將其存儲為Java中的String對象並解析為JSON對象? 我嘗試了這段代碼。
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);
但是在這里,json變量僅保存文件的單行,但是我希望整個文件以漂亮的格式打印。 我怎樣才能做到這一點 ? 這里的每一行都是一個單獨的實體。
根據您在評論中的回答,我認為它應該起作用:
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);
輸出JSON如下所示:
[ {
"firstName" : "John",
"lastName" : "Doe"
}, {
"firstName" : "Anna",
"lastName" : "Smith"
}, {
"firstName" : "Peter",
"lastName" : "Jones"
} ]
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