用jackson输出标准的json字符串

 1 public class JacksonObjectMapperExample { 2 ?3 ????public static String formatJson(String jsonStr) throws IOException { 4 ????????ObjectMapper objectMapper = new ObjectMapper(); 5 ????????// 允许没有引号的字段名（非标准） 6 ????????objectMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true); 7 ????????// 允许单引号（非标准） 8 ????????objectMapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true); 9 ????????Object json = objectMapper.readValue(jsonStr, Object.class);10 ????????//美化11 ????????//System.out.println(objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(json));12 ????????//objectMapper.configure(SerializationFeature.INDENT_OUTPUT, true);13 ????????//不美化14 ????????objectMapper.configure(SerializationFeature.INDENT_OUTPUT, false);15 16 ????????return objectMapper.writeValueAsString(json);17 ????}18 19 ????public static void main(String[] args) throws IOException {20 ????????String test = "{age:29,messages:[\"msg 1\",\"msg 2\",\"msg 3\"],\"name\":\"mkyong\"}";21 ????????System.out.println(formatJson(test));22 ????}23 }