– Start

点击此处观看本系列配套视频。

除了 ObjectMapper 和 JsonNode 外，Jackson 还提供了更底层 JsonParser 和 JsonGenerator 来读写 JSON。

package shangbo.jackson.demo21;import java.io.File;import com.fasterxml.jackson.core.JsonEncoding;import com.fasterxml.jackson.core.JsonFactory;import com.fasterxml.jackson.core.JsonGenerator;public class App {public static void main(String[] args) throws Exception {// 实例化 JsonFactory 和 JsonParser 对象JsonFactory factory = new JsonFactory();JsonGenerator gernerator = factory.createGenerator(new File("D:\\0_Shangbo\\Dev\\people.json"), JsonEncoding.UTF8);// 生成 jsongernerator.writeStartObject();gernerator.writeStringField("firstname", "Bo");gernerator.writeStringField("lasttname", "Shang");gernerator.writeNumberField("age", 30);gernerator.writeEndObject();gernerator.close();}}

package shangbo.jackson.demo20;import com.fasterxml.jackson.core.JsonFactory;import com.fasterxml.jackson.core.JsonParser;import com.fasterxml.jackson.core.JsonToken;public class App {public static void main(String[] args) throws Exception {// json 消息String json = "{\"firstname\":\"Bo\",\"lastname\":\"Shang\",\"age\":30}";// 实例化 JsonFactory 和 JsonParser 对象JsonFactory factory = new JsonFactory();JsonParser parser = factory.createParser(json);// 解析 jsonwhile(!parser.isClosed()) {JsonToken jsonToken = parser.nextToken();if(JsonToken.FIELD_NAME.equals(jsonToken)) {String fieldName = parser.getCurrentName();jsonToken = parser.nextToken();System.out.println(fieldName + ":" + parser.getValueAsString());}}}}

– 更多参见：Jackson 精萃

– 声 明：转载请注明出处

– Last Updated on -05-26

– Written by ShangBo on -05-26

– End