package com.cq2022.zago.base.util;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;import java.io.StringWriter;import java.util.List;import java.util.Map;import org.codehaus.jackson.JsonFactory;import org.codehaus.jackson.JsonGenerationException;import org.codehaus.jackson.JsonGenerator;import org.codehaus.jackson.JsonNode;import org.codehaus.jackson.JsonParseException;import org.codehaus.jackson.map.JsonMappingException;import org.codehaus.jackson.map.ObjectMapper;import org.codehaus.jackson.map.SerializationConfig;import org.codehaus.jackson.map.annotate.JsonSerialize;import com.alibaba.fastjson.JSONArray;/** * Json工具类，实现JSON与Java Bean的互相转换 */public class JsonUtils { private static ObjectMapper objectMapper = new ObjectMapper(); private static JsonFactory jsonFactory = new JsonFactory(); static { objectMapper.configure(SerializationConfig.Feature.WRITE_NULL_MAP_VALUES, false); objectMapper.setSerializationInclusion(JsonSerialize.Inclusion.NON_NULL); } /** * 泛型返回，json字符串转对象 * @param jsonAsString * @param pojoClass * @return * @throws JsonMappingException * @throws JsonParseException * @throws IOException */ public static <T> T fromJson(String jsonAsString, Class<T> pojoClass) throws JsonMappingException, JsonParseException, IOException { return objectMapper.readValue(jsonAsString, pojoClass); } public static <T> T fromJson(FileReader fr, Class<T> pojoClass) throws JsonParseException, IOException { return objectMapper.readValue(fr, pojoClass); } /** * Object对象转json * @param pojo * @return * @throws JsonMappingException * @throws JsonGenerationException * @throws IOException */ public static String toJson(Object pojo) throws JsonMappingException, JsonGenerationException, IOException { return toJson(pojo, false); } public static String toJson(Object pojo, boolean prettyPrint) throws JsonMappingException, JsonGenerationException, IOException { StringWriter sw = new StringWriter(); JsonGenerator jg = jsonFactory.createJsonGenerator(sw); if (prettyPrint) { jg.useDefaultPrettyPrinter(); } objectMapper.writeValue(jg, pojo); return sw.toString(); } public static void toJson(Object pojo, FileWriter fw, boolean prettyPrint) throws JsonMappingException, JsonGenerationException, IOException { JsonGenerator jg = jsonFactory.createJsonGenerator(fw); if (prettyPrint) { jg.useDefaultPrettyPrinter(); } objectMapper.writeValue(jg, pojo); } /** * json字符串转Map * @param jsonStr * @return * @throws IOException */ public static Map<String, Object> parseMap(String jsonStr) throws IOException { Map<String, Object> map = objectMapper.readValue(jsonStr, Map.class); return map; } public static JsonNode parse(String jsonStr) throws IOException { JsonNode node = null; node = objectMapper.readTree(jsonStr); return node; } public static ObjectMapper getObjectMapper() { return objectMapper; } /** * json字符串转 List对象 * @param str json字符串 * @param clazz 转换的类型 * @return */ public static <T> List<T> fromListJson(String str,Class<T> clazz){ return JSONArray.parseArray(str, clazz); }} 
