Fastjson實(shí)用工具類(lèi)，List轉(zhuǎn)JSONString，List轉(zhuǎn)JSONArray，JSONArray轉(zhuǎn)List，JSONArray轉(zhuǎn)ArrayList，JSONObject轉(zhuǎn)HashMap

• 問(wèn)題背景
• Fastjson轉(zhuǎn)換
• 心得
• Lyric：我們擁有

問(wèn)題背景

因?yàn)榻?jīng)常用到fastjson，但fastjson里面有些轉(zhuǎn)換沒(méi)有，自己寫(xiě)了一個(gè)工具類(lèi)，方便快捷進(jìn)行轉(zhuǎn)換
注意事項(xiàng)：

• 添加fastjson和common-lang3的依賴(lài)包
• 可以直接復(fù)制文中的代碼，也可以下載源碼進(jìn)行參考

Fastjson轉(zhuǎn)換

1 FastjsonUtils工具轉(zhuǎn)換類(lèi)

package com.yg.fastjson.utils;import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.JSONArray; import com.alibaba.fastjson.JSONObject; import com.alibaba.fastjson.serializer.SerializeConfig; import com.alibaba.fastjson.serializer.SerializerFeature; import com.alibaba.fastjson.serializer.SimpleDateFormatSerializer; import lombok.extern.slf4j.Slf4j; import org.apache.commons.lang3.StringUtils;import java.util.*;/*** @Author suolong* @Date 2022/3/19 11:24* @Version 1.5*/ @Slf4j public final class FastjsonUtils {//fastjson格式轉(zhuǎn)換器private static SerializeConfig config;static {config = new SerializeConfig();config.put(Date.class, new SimpleDateFormatSerializer("yyyy-MM-dd HH:mm:ss"));}private static final SerializerFeature[] features = {// 輸出空置字段SerializerFeature.WriteMapNullValue,// list字段如果為null，輸出為[]，而不是nullSerializerFeature.WriteNullListAsEmpty,// 數(shù)值字段如果為null，輸出為0，而不是nullSerializerFeature.WriteNullNumberAsZero,// Boolean字段如果為null，輸出為false，而不是nullSerializerFeature.WriteNullBooleanAsFalse,// 字符類(lèi)型字段如果為null，輸出為""，而不是nullSerializerFeature.WriteNullStringAsEmpty};/*** Object TO Json String 字符串輸出*/public static String toJSONString(Object object) {try {return JSON.toJSONString(object, config, features);} catch (Exception e) {log.error("JsonUtil | method=toJSON() | 對(duì)象轉(zhuǎn)為Json字符串 Error！" + e.getMessage(), e);}return null;}/*** Object TO Json String Json-lib兼容的日期輸出格式*/public static String toJSONLib(Object object) {try {return JSON.toJSONString(object, config, features);} catch (Exception e) {log.error("JsonUtil | method=toJSONLib() | 對(duì)象轉(zhuǎn)為Json字符串 Json-lib兼容的日期輸出格式 Error！" + e.getMessage(), e);}return null;}/*** 轉(zhuǎn)換為數(shù)組 Object*/public static Object[] toArray(String text) {try {return toArray(text, null);} catch (Exception e) {log.error("JsonUtil | method=toArray() | 將json格式的數(shù)據(jù)轉(zhuǎn)換為數(shù)組 Object Error！" + e.getMessage(), e);}return null;}/*** 轉(zhuǎn)換為數(shù)組 （可指定類(lèi)型）*/public static <T> Object[] toArray(String text, Class<T> clazz) {try {return JSON.parseArray(text, clazz).toArray();} catch (Exception e) {log.error("JsonUtil | method=toArray() | 將json格式的數(shù)據(jù)轉(zhuǎn)換為數(shù)組 （可指定類(lèi)型） Error！" + e.getMessage(), e);}return null;}/*** List轉(zhuǎn)換為JSONArray*/public static JSONArray toJSONArray(List<?> list) {try {String json = toJSONString(list);return JSONArray.parseArray(json);} catch (Exception e) {log.error("JsonUtil | method=toJSONArray() | 將list格式的數(shù)據(jù)轉(zhuǎn)換為JSONArray Object Error！" + e.getMessage(), e);}return null;}/*** 重載類(lèi)型為String* Json 轉(zhuǎn)為 Jave Bean, 再使用Bean類(lèi)型進(jìn)行強(qiáng)轉(zhuǎn)*/public static <T> T toBean(String text, Class<T> clazz) {try {return JSON.parseObject(text, clazz);} catch (Exception e) {log.error("JsonUtil | method=toBean() | Json 轉(zhuǎn)為 Jave Bean Error！" + e.getMessage(), e);}return null;}/*** 重載類(lèi)型為JSONObject* Json 轉(zhuǎn)為 Jave Bean, 再使用Bean類(lèi)型進(jìn)行強(qiáng)轉(zhuǎn)*/public static <T> T toBean(JSONObject text, Class<T> clazz) {try {String json = toJSONString(text);return toBean(json, clazz);} catch (Exception e) {log.error("JsonUtil | method=toBean() | Json 轉(zhuǎn)為 Jave Bean Error！" + e.getMessage(), e);}return null;}/*** 重載類(lèi)型為String* Json 轉(zhuǎn)為 Map，JSON.parseObject轉(zhuǎn)換的類(lèi)型為JSONObject，但是JSONObject實(shí)現(xiàn)了Map接口*/public static Map<?, ?> toMap(String json) {try {return JSON.parseObject(json);} catch (Exception e) {log.error("JsonUtil | method=toMap() | Json 轉(zhuǎn)為 Map {},{}" + e.getMessage(), e);}return null;}/*** 重載類(lèi)型為JSONObject* Json 轉(zhuǎn)為 Map，JSON.parseObject轉(zhuǎn)換的類(lèi)型為JSONObject，但是JSONObject實(shí)現(xiàn)了Map接口*/public static Map<?, ?> toMap(JSONObject json) {try {return JSON.parseObject(JSON.toJSONString(json));} catch (Exception e) {log.error("JsonUtil | method=toMap() | Json 轉(zhuǎn)為 Map {},{}" + e.getMessage(), e);}return null;}/*** 重載類(lèi)型為String* Json 轉(zhuǎn)為 Map，JSON.parseObject轉(zhuǎn)換的類(lèi)型為JSONObject，但是JSONObject實(shí)現(xiàn)了Map接口*/public static HashMap<?, ?> toHashMap(String json) {try {Map<?, ?> map = toMap(json);return new HashMap<>(map);} catch (Exception e) {log.error("JsonUtil | method=toMap() | Json 轉(zhuǎn)為 Map {},{}" + e.getMessage(), e);}return null;}/*** 重載類(lèi)型為JSONObject* Json 轉(zhuǎn)為 Map，JSON.parseObject轉(zhuǎn)換的類(lèi)型為JSONObject，但是JSONObject實(shí)現(xiàn)了Map接口*/public static HashMap<?, ?> toHashMap(JSONObject json) {try {Map<?, ?> map = toMap(json);return new HashMap<>(map);} catch (Exception e) {log.error("JsonUtil | method=toMap() | Json 轉(zhuǎn)為 Map {},{}" + e.getMessage(), e);}return null;}/*** 重載類(lèi)型為String* Json 轉(zhuǎn) List,Class 集合中泛型的類(lèi)型，非集合本身，可json-lib兼容的日期格式*/public static <T> List<T> toList(String text, Class<T> clazz) {try {return JSON.parseArray(text, clazz);} catch (Exception e) {log.error("JsonUtil | method=toList() | Json 轉(zhuǎn)為 List {},{}" + e.getMessage(), e);}return null;}/*** 重載類(lèi)型為JSONObject* Json 轉(zhuǎn) List,Class 集合中泛型的類(lèi)型，非集合本身，可json-lib兼容的日期格式*/public static <T> List<T> toList(JSONArray text, Class<T> clazz) {try {String json = toJSONString(text);return toList(json, clazz);} catch (Exception e) {log.error("JsonUtil | method=toList() | Json 轉(zhuǎn)為 List {},{}" + e.getMessage(), e);}return null;}/*** 重載類(lèi)型為String* Json 轉(zhuǎn) List,Class 集合中泛型的類(lèi)型，非集合本身，可json-lib兼容的日期格式*/public static <T> ArrayList<T> toArrayList(String text, Class<T> clazz) {try {List<T> list = toList(text, clazz);assert list != null;return new ArrayList<>(list);} catch (Exception e) {log.error("JsonUtil | method=toList() | Json 轉(zhuǎn)為 List {},{}" + e.getMessage(), e);}return null;}/*** 重載類(lèi)型為JSONObject,clazz為list里面的類(lèi)型* Json 轉(zhuǎn) List,Class 集合中泛型的類(lèi)型，非集合本身，可json-lib兼容的日期格式*/public static <T> ArrayList<T> toArrayList(JSONArray text, Class<T> clazz) {try {List<T> list = toList(text, clazz);assert list != null;return new ArrayList<>(list);} catch (Exception e) {log.error("JsonUtil | method=toList() | Json 轉(zhuǎn)為 List {},{}" + e.getMessage(), e);}return null;}/*** 重載類(lèi)型為String* 從json字符串獲取指定key的字符串*/public static Object getValueFromJson(final String json, final String key) {try {if (StringUtils.isBlank(json) || StringUtils.isBlank(key)) {return null;}return JSON.parseObject(json).getString(key);} catch (Exception e) {log.error("JsonUtil | method=getStringFromJson() | 從json獲取指定key的字符串 Error！" + e.getMessage(), e);}return null;}/*** 重載類(lèi)型為JSONObject* 從json字符串獲取指定key的字符串*/public static Object getValueFromJson(final JSONObject json, final String key) {try {String text = toJSONString(json);return getValueFromJson(text, key);} catch (Exception e) {log.error("JsonUtil | method=getStringFromJson() | 從json獲取指定key的字符串 Error！" + e.getMessage(), e);}return null;} }

2 測(cè)試main函數(shù)

package com.yg.fastjson.service;import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.JSONArray; import com.alibaba.fastjson.JSONObject; import com.yg.fastjson.response.Response; import com.yg.fastjson.utils.FastjsonUtils; import com.yg.fastjson.utils.JsonUtils;import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map;/*** @Author suolong* @Date 2022/3/18 17:55* @Version 1.0*/ public class FastjsonTest {public static void main(String[] args) {List<HashMap<Integer, Integer>> arrayList = new ArrayList<>();for (int i = 0; i < 5; i++) {HashMap<Integer, Integer> hashMap = new HashMap<>();hashMap.put(i + 11, i + 10);hashMap.put(i + 21, i + 10);hashMap.put(i + 31, i + 10);arrayList.add(hashMap);}//將List轉(zhuǎn)為JSONStringString jsonString = FastjsonUtils.toJSONString(arrayList);System.out.println(jsonString);//將List轉(zhuǎn)為JSONArrayJSONArray jsonArray = FastjsonUtils.toJSONArray(arrayList);System.out.println(jsonArray.toString());//將JSONArray轉(zhuǎn)為L(zhǎng)istList<HashMap> hpList= FastjsonUtils.toList(jsonArray, HashMap.class);System.out.println(hpList.get(0).getClass());//將JSONArray轉(zhuǎn)為ArrayListArrayList<HashMap> arrayList1 = FastjsonUtils.toArrayList(jsonArray, HashMap.class);System.out.println(arrayList1.get(0).get(11+""));//將string轉(zhuǎn)為beanResponse<String> boy = Response.success("you are a cool boy");String s = JSON.toJSONString(boy);Response response = FastjsonUtils.toBean(s, Response.class);System.out.println(response);} }

3 代碼中測(cè)試Bean轉(zhuǎn)換的response類(lèi)

package com.yg.fastjson.response;import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes;import javax.servlet.http.HttpServletResponse; import java.io.Serializable;public class Response<T> implements Serializable {private static final long serialVersionUID = -1222614520893986846L;private T data;/*** 錯(cuò)誤碼*/private String code;/*** 錯(cuò)誤信息*/private String msg;public Response() {}public Response(T data, String code, String msg) {this.data = data;this.code = code;this.msg = msg;}public T getData() {return data;}public void setData(T data) {this.data = data;}public String getCode() {return code;}public void setCode(String code) {this.code = code;}public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}public static <T> Response<T> success(T data){return new Response<T>(data, ResponseCode.SUCESS, "ok");}public static <T> Response<T> success(T data, ResultCode resultCode){return new Response<T>(data, resultCode.getCode(), resultCode.getMsg());}public static <T> Response<T> notFound(){return new Response<T>(null, ResponseCode.FAIL, "server error");}// public static <T> Response<T> internalError(){ // return new Response<T>(null, ResultCode.CODE_98.getCode(), ResultCode.CODE_98.getMsg()); // }/*** 系統(tǒng)異常，為了不影響客戶(hù)，返回?cái)?shù)據(jù)未查的* @param <T>* @return*/public static <T> Response<T> internalError(){return new Response<T>(null, ResultCode.CODE_02.getCode(), ResultCode.CODE_02.getMsg());}public static <T> Response<T> internalError(String msg){//setResponseStatus(500);return new Response<T>(null, ResponseCode.FAIL, msg);}public static <T> Response<T> needLoginError(String msg){setResponseStatus(500);return new Response<T>(null, ResponseCode.NEEDLOGIN, msg);}private static void setResponseStatus(int i) {ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();if (servletRequestAttributes == null) {//log.warn("failed to set response, because can't get HttpServletResponse");return;}final HttpServletResponse response = servletRequestAttributes.getResponse();if (response == null) {//log.warn("failed to set response, because can't get HttpServletResponse");return;}response.setStatus(i);}@Overridepublic String toString() {return "Response [data:" + data + ", code:" + code + ", message:" + msg + "]";}} package com.yg.fastjson.response;public class ResponseCode {/*** 表明該請(qǐng)求被成功地完成，所請(qǐng)求的資源發(fā)送到客戶(hù)端。*/public static final String SUCESS = "200";/*** 系統(tǒng)執(zhí)行錯(cuò)誤*/public static final String FAIL = "500";/*** 系統(tǒng)執(zhí)行錯(cuò)誤*/public static final String NEEDLOGIN = "401";} package com.yg.fastjson.response;public enum ResultCode {//00：成功，01：入?yún)⒋嬖诜欠╪ull，02：數(shù)據(jù)未查得，98：系統(tǒng)異常CODE_00("00","成功"),CODE_01("01","入?yún)⒋嬖诜欠╪ull"),CODE_02("02","數(shù)據(jù)未查得"),CODE_03("03","非規(guī)定的調(diào)用時(shí)間"),CODE_98("98","系統(tǒng)異常"),CODE_401("401","未登錄");private String code;private String msg;ResultCode(String code, String msg) {this.code = code;this.msg = msg;}public String getCode() {return code;}public String getMsg() {return msg;} }

心得

• 這個(gè)工具類(lèi)挺好用的，有新的轉(zhuǎn)法我會(huì)及時(shí)更新

作為程序員第 78 篇文章，每次寫(xiě)一句歌詞記錄一下，看看人生有幾首歌的時(shí)間，wahahaha …

Lyric：我們擁有

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