目錄一、fastJson將json格式字符串轉化成List集合二、fastJson將json格式字符串轉化成對象三、FastJson將對象或集合轉化成json格式字符串四、FastJson將json格式字符串轉化成json對象五、FastJson將json格式字符串轉化成json數組六、FastJson將java對象轉化成json對象一、fastJson將json格式字符串轉化成List集合

注：json格式字符串必須符合數組型格式如[{'a':a},{'b':b}]

場景一：前端向后臺傳遞數組格式的json字符串，如何轉化成List集合

List<AccountBean> readJson2List =JSON.parseArray(json, AccountBean.class)注意這里是Bean.class而不是List.class

@Testpublic void readJson2ListBean() {String json = '[{'address': 'address2','name':'haha2','id':2,'email':'email2'},{'address':'address','name':'haha','id':1,'email':'email'}]';List<AccountBean> readJson2List =JSON.parseArray(json, AccountBean.class);//輸出測試JsonUtils.beanToJson(readJson2List);}

場景二：前端向后臺傳遞數組格式的json字符串，如何轉化成List<HashMap<String,Object>>集合

@Testpublic void readJson2ListMap() {String json = '[{'address': 'address2','name':'haha2','id':2,'email':'email2'},{'address':'address','name':'haha','id':1,'email':'email'}]';List<HashMap> readJson2List =JSON.parseArray(json,HashMap.class);//輸出測試JsonUtils.beanToJson(readJson2List);}二、fastJson將json格式字符串轉化成對象

場景一：前端向后臺傳遞數組格式的json字符轉化成Bean對象

@Testpublic void readJson2Bean() {String json = '{'address': 'address2','name':'haha2','id':2,'email':'email2'}';AccountBean accountBean =JSON.parseObject(json,AccountBean.class);//輸出測試JsonUtils.beanToJson(accountBean);}

場景二：前端向后臺傳遞數組格式的json字符串Map<String,Object>集合

@Testpublic void readJson2Map() {String json = '{'address': 'address2','name':'haha2','id':2,'email':'email2'}';HashMap<String,Object> accountBean =JSON.parseObject(json,Map.class);//輸出測試JsonUtils.beanToJson(accountBean);}

測試：

三、FastJson將對象或集合轉化成json格式字符串

@Testpublic void beanAndCollectionTOJson() {AccountBeanbean = new AccountBean();bean.setAddress('china-Guangzhou');bean.setEmail('hoojo_@126.com');bean.setId(1);bean.setName('hoojo');String json = JSON.toJSONString(bean);System.out.println(json);}四、FastJson將json格式字符串轉化成json對象

@Testpublic void jsonStringTOJsonBean() {String json = '{'address': 'address2','name':'haha2','id':2,'email':'email2'}';JSONObject parse = (JSONObject) JSON.parse(json);String address = (String) parse.get('address');System.out.println('輸出address=='+address);}

五、FastJson將json格式字符串轉化成json數組

@Testpublic void jsonString2JsonArray() {String json = '[{'address': 'address2','name':'haha2','id':2,'email':'email2'},{'address':'address','name':'haha','id':1,'email':'email'}]';JSONArray parseArray = JSON.parseArray(json);//輸出測試JsonUtils.beanToJson(parseArray.get(0));}

六、FastJson將java對象轉化成json對象

@Testpublic void beanAndCollectionTOJsonBean() {AccountBeanbean = new AccountBean();bean.setAddress('china-Guangzhou');bean.setEmail('hoojo_@126.com');bean.setId(1);bean.setName('hoojo');JSONObject json = (JSONObject) JSON.toJSON(bean);json.get('address');System.out.println(json);}

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