轉(zhuǎn)自：https://blog.csdn.net/gongpulin/article/details/52062532

這是關(guān)于FastJson的一個(gè)使用Demo，在Java環(huán)境下驗(yàn)證的

?

這是關(guān)于FastJson的一個(gè)使用Demo，在Java環(huán)境下驗(yàn)證的

?

[java]?view plain?copy

class?User{??

????private?int?id;??

????private?String?name;??

????public?int?getId()?{??

????????return?id;??

????}??

????public?void?setId(int?id)?{??

????????this.id?=?id;??

????}??

????public?String?getName()?{??

????????return?name;??

????}??

????public?void?setName(String?name)?{??

????????this.name?=?name;??

????}??

}??

[java]?view plain?copy

import?java.util.ArrayList;??

import?java.util.List;??

??

class?Group{??

????private?int?id;??

????private?String?name;??

????private?List<User>?list?=?new?ArrayList<User>();??

????public?int?getId()?{??

????????return?id;??

????}??

????public?void?setId(int?id)?{??

????????this.id?=?id;??

????}??

????public?String?getName()?{??

????????return?name;??

????}??

????public?void?setName(String?name)?{??

????????this.name?=?name;??

????}??

????public?List<User>?getList()?{??

????????return?list;??

????}??

????public?void?setList(List<User>?list)?{??

????????this.list?=?list;??

????}??

}??

[java]?view plain?copy

class?Weibo?{??

????private?String?id;??

????private?String?city;??

??

????public?Weibo(String?id,?String?city)?{??

????????this.id?=?id;??

????????this.city?=?city;??

????}??

??

????public?Weibo()?{??

????}??

??

????public?String?getId()?{??

????????return?id;??

????}??

??

????public?void?setId(String?id)?{??

????????this.id?=?id;??

????}??

??

????public?String?getCity()?{??

????????return?city;??

????}??

??

????public?void?setCity(String?city)?{??

????????this.city?=?city;??

????}??

}??

[java]?view plain?copy

import?java.util.HashMap;??

import?java.util.List;??

import?java.util.Map;??

??

import?com.alibaba.fastjson.JSON;??

import?com.alibaba.fastjson.JSONArray;??

import?com.alibaba.fastjson.JSONObject;??

??

//下面是FastJson的簡(jiǎn)介：常用的方法！??

//??Fastjson?API入口類(lèi)是com.alibaba.fastjson.JSON，常用的序列化操作都可以在JSON類(lèi)上的靜態(tài)方法直接完成。??

//??public?static?final?Object?parse(String?text);?//?把JSON文本parse為JSONObject或者JSONArray???

//??public?static?final?JSONObject?parseObject(String?text)；?//?把JSON文本parse成JSONObject??????

//??public?static?final?<T>?T?parseObject(String?text,?Class<T>?clazz);?//?把JSON文本parse為JavaBean???

//??public?static?final?JSONArray?parseArray(String?text);?//?把JSON文本parse成JSONArray???

//??public?static?final?<T>?List<T>?parseArray(String?text,?Class<T>?clazz);?//把JSON文本parse成JavaBean集合???

//??public?static?final?String?toJSONString(Object?object);?//?將JavaBean序列化為JSON文本???

//??public?static?final?String?toJSONString(Object?object,?boolean?prettyFormat);?//?將JavaBean序列化為帶格式的JSON文本???

//??public?static?final?Object?toJSON(Object?javaObject);?將JavaBean轉(zhuǎn)換為JSONObject或者JSONArray（和上面方法的區(qū)別是返回值是不一樣的）??

??

/**?

?*?這是關(guān)于FastJson的一個(gè)使用Demo，在Java環(huán)境下驗(yàn)證的；?

?*?使用的時(shí)候可以參照這個(gè)例子進(jìn)行回憶！?

?*?備注：下面寫(xiě)的Json格式的數(shù)據(jù)"前面的\，意思是告訴編譯器忽略掉它后面的"。?

?*?后面定義有三個(gè)類(lèi)：User、Group、Weibo?

?*?@author?liuzhao?

?*/??

public?class?JsonDemo?{??

??

????public?static?void?main(String[]?args)?{??

??????????

????????json2JsonObjectM1();//將Json文本數(shù)據(jù)信息轉(zhuǎn)換為JsonObject對(duì)象，然后利用鍵值對(duì)的方式獲取信息??

????????json2BeanM2();//將Json文本數(shù)據(jù)轉(zhuǎn)換為JavaBean數(shù)據(jù)！??

????????json2JSONArrayM3();//將json數(shù)據(jù)轉(zhuǎn)化為JSONArray:???

????????json2JavaBeanM4();//將JSON文本轉(zhuǎn)換為JavaBean的集合；轉(zhuǎn)換為單純的1個(gè)Object：parseObject(String?text,?Class<T>?clazz);???

????????bean2JsonM5();//將JavaBean轉(zhuǎn)換為Json格式的數(shù)據(jù)/Json文本?用戶(hù)數(shù)據(jù)的傳遞：例如上傳服務(wù)器??

????????bean2JSONObjectM6();//將JavaBean轉(zhuǎn)換為JSON對(duì)象??

????????complexExampleM7();//一個(gè)相對(duì)復(fù)雜的例子：??

????????complex2JsonM8();//一個(gè)復(fù)雜的Object到Json的Demo??

????????complexMap2JsonM9();//將Map數(shù)據(jù)轉(zhuǎn)換為JsonString的Demo；這個(gè)對(duì)RedBoy服務(wù)端不就直接破了嘛！??

????}??

??

????/**?

?????*?將Json文本數(shù)據(jù)信息轉(zhuǎn)換為JsonObject對(duì)象，然后利用鍵值對(duì)的方式獲取信息?

?????*/??

????private?static?void?json2JsonObjectM1()?{??

????????//一個(gè)JsonObject文本數(shù)據(jù)??

????????String?s?=?"{\"name\":\"liuzhao\"}";??

????????//將JsonObject數(shù)據(jù)轉(zhuǎn)換為Json??

????????JSONObject?object?=?JSON.parseObject(s);??

????????//利用鍵值對(duì)的方式獲取到值??

????????System.out.println(object.get("name"));??

????????/**?

?????????*?打印：?

?????????*?liuzhao?

?????????*/??

????}??

??????

????/**?

?????*?將Json文本數(shù)據(jù)轉(zhuǎn)換為JavaBean數(shù)據(jù)！?

?????*?需要注意的是：這時(shí)候的Json文本信息中的鍵的名稱(chēng)必須和JavaBean中的字段名稱(chēng)一樣！鍵中沒(méi)有的在這個(gè)JavaBean中就顯示為null！?

?????*/??

????private?static?void?json2BeanM2()?{??

????????String?s?=?"{\"id\":\"0375\",\"city\":\"平頂山\"}";??

????????//一個(gè)簡(jiǎn)單方便?的方法將Json文本信息轉(zhuǎn)換為JsonObject對(duì)象的同時(shí)轉(zhuǎn)換為JavaBean對(duì)象！??

????????Weibo?weibo?=?JSON.parseObject(s,?Weibo.class);//Weibo類(lèi)在下邊定義??

????????System.out.println(weibo.getId());??

????????System.out.println(weibo.getCity());??

????????//打印的結(jié)果?????0375??

????????//??????????????平頂山??

????}??

??

??

????/**?

?????*?將Map類(lèi)型的數(shù)據(jù)轉(zhuǎn)換為JsonString?

?????*/??

????private?static?void?complexMap2JsonM9()?{??

????????Group?group?=?new?Group();??

????????group.setId(1);??

????????group.setName("group");??

??????????

????????User?user1?=?new?User();??

????????user1.setId(2);??

????????user1.setName("user1");??

??

????????User?user2?=?new?User();??

????????user2.setId(3);??

????????user2.setName("user2");??

????????group.getList().add(user1);??

????????group.getList().add(user2);??

??????????

????????Map<Integer,?Object>?map?=?new?HashMap<Integer,Object>();??

????????map.put(1,?"No.1");??

????????map.put(2,?"No.2");??

????????map.put(3,?group.getList());??

??????????

????????String?jsonString?=?JSON.toJSONString(map);??

????????System.out.println(jsonString);??

????????/**?

?????????*??輸出：{1:"No.1",2:"No.2",3:[{"id":2,"name":"user1"},{"id":3,"name":"user2"}]}?

?????????*/??

????}??

??

????/**?

?????*?由一個(gè)復(fù)雜的Object到Json的Demo?

?????*/??

????private?static?void?complex2JsonM8()?{??

????????Group?group?=?new?Group();??

????????group.setId(1);??

????????group.setName("group");??

??????????

????????User?user1?=?new?User();??

????????user1.setId(2);??

????????user1.setName("user1");??

??

????????User?user2?=?new?User();??

????????user2.setId(3);??

????????user2.setName("user2");??

????????group.getList().add(user1);??

????????group.getList().add(user2);??

????????String?jsonString?=?JSON.toJSONString(group);??

????????System.out.println(jsonString);??

????????/**?

?????????*??輸出：{"id":1,"list":[{"id":2,"name":"user1"},{"id":3,"name":"user2"}],"name":"group"}?

?????????*/??

????}??

??

????/**?

?????*?一個(gè)相對(duì)復(fù)雜的例子：?

?????*?JSON文本數(shù)據(jù)：?

?????*??????首先是JSONObject，轉(zhuǎn)換為JSONArray；?

?????*??????然后將JSONArray轉(zhuǎn)換為JavaBean?

?????*/??

????private?static?void?complexExampleM7()?{??

????????String?s?=?"{js:[{id:\"110000\",\"city\":\"北#001京市\(zhòng)"},{id:\"110000\",\"city\":\"北#002京市\(zhòng)"}"??

????????????????+?",{id:\"110000\",\"city\":\"北#002京市\(zhòng)"},{id:\"110000\",\"city\":\"北#002京市\(zhòng)"},"??

????????????????+?"{id:\"110000\",\"city\":\"#006北#005京市\(zhòng)"},"??

????????????????+?"{id:\"110000\",\"city\":\"北#002京市\(zhòng)"},"??

????????????????+?"{id:\"110000\",\"city\":\"北#002京市\(zhòng)"},{id:\"120000\",\"city\":\"天#009津市\(zhòng)"}]}";??

??????????

????????JSONObject?object?=?JSON.parseObject(s);??

????????Object?jsonArray?=?object.get("js");??

????????System.out.println(jsonArray);??

????????List<Weibo>?list?=?JSON.parseArray(jsonArray+"",?Weibo.class);??

????????for?(Weibo?weibo?:?list)?{??

????????????System.out.println(weibo.getCity());??

????????}??

????}??

??

????/**?

?????*?將JavaBean轉(zhuǎn)換為JSON對(duì)象?

?????*/??

????private?static?void?bean2JSONObjectM6()?{??

????????Weibo?weibo?=?new?Weibo("0373",?"洛陽(yáng)");??

????????JSONObject?json?=?(JSONObject)?JSON.toJSON(weibo);??

????????System.out.println(json.get("id"));??

????????/**?

?????????*?打印：?

?????????*?0373?

?????????*/??

????}??

??

????/**?

?????*?將JSON文本轉(zhuǎn)換為JavaBean的集合；?

?????*?內(nèi)部實(shí)現(xiàn)肯定是：首先轉(zhuǎn)換為JSONArray，然后再轉(zhuǎn)換為L(zhǎng)ist集合?

?????*/??

????private?static?void?json2JavaBeanM4()?{??

????????String?s?=?"[{\"id\":\"0375\",\"city\":\"平頂山\"},{\"id\":\"0377\",\"city\":\"南陽(yáng)\"}]";??

????????List<Weibo>?list?=?JSON.parseArray(s,?Weibo.class);??

????????for?(Weibo?weibo?:?list)?{??

????????????System.out.println(weibo.getCity());??

????????}??

????????/**?

?????????*?打印：?

?????????*?平頂山?

?????????*?南陽(yáng)?

?????????*/??

????}??

??

????/**?

?????*?將json數(shù)據(jù)轉(zhuǎn)化為JSONArray:?

?????*?注意：獲取到JSONArray之后（我們這里只是獲取到JSONArray而不是JavaBean的List集合）?

?????*?獲取JSONArray中的數(shù)據(jù)轉(zhuǎn)換為String類(lèi)型需要在外邊加"";?

?????*/??

????private?static?void?json2JSONArrayM3()?{??

????????String?s?=?"[{\"id\":\"0375\",\"city\":\"平頂山\"},{\"id\":\"0377\",\"city\":\"南陽(yáng)\"}]";??

????????//將JSON文本轉(zhuǎn)換為JSONArray??

????????JSONArray?array?=?JSON.parseArray(s);??

????????//這行必須寫(xiě)：必須加上+"";不然會(huì)報(bào)出類(lèi)型強(qiáng)轉(zhuǎn)異常！??

????????String?str?=?array.get(1)+"";??

????????System.out.println(array.get(0));??

????????JSONObject?object?=?JSON.parseObject(str);??

????????System.out.println(object.get("id"));??

????????/**?

?????????*?{"city":"平頂山","id":"0375"}?

????????????0377?

?????????*/??

????}??

??

??

????/**?

?????*?將JavaBean轉(zhuǎn)換為Json格式的數(shù)據(jù)/Json文本?

?????*?用戶(hù)數(shù)據(jù)的傳遞：例如上傳服務(wù)器?

?????*/??

????private?static?void?bean2JsonM5()?{??

????????Weibo?weibo?=?new?Weibo("123456",?"上海");??

????????String?string?=?JSON.toJSONString(weibo);??

????????System.out.println(string);??

????????/**?

?????????*?打印：?

?????????*?{"city":"上海","id":"123456"}?

?????????*/??

????}??

??

}??

轉(zhuǎn)載于:https://www.cnblogs.com/sharpest/p/7871665.html

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