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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 fromJson(String jsonAsString, Class pojoClass) throws JsonMappingException, JsonParseException, IOException { return objectMapper.readValue(jsonAsString, pojoClass); } public static T fromJson(FileReader fr, Class 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 parseMap(String jsonStr) throws IOException { Map 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 c<mark style="color:transparent">来源gaodaimacom搞#^代%!码网</mark>lazz 转换的类型 * @return */ public static List fromListJson(String str,Class clazz){ return JSONArray.parseArray(str, clazz); } }
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