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
@Test
public 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
@Test
public 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
@Test
public 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
@Test
public 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
@Test
public void beanAndCollectionTOJson() {
AccountBean bean = 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
@Test
public 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
@Test
public 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
@Test
public void beanAndCollectionTOJsonBean() {
AccountBean bean = 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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