正文
JSONBuilder的用法
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一。JSONBuilder可以向文件中写入写入json字符串。如下面的例子：
1 public class Test
2 {
3 public static void main(String args[]) throws IOException
4 {
5 File f = new File("d:" + File.separator + "test.txt");
6 FileWriter fw = new FileWriter(f);
7 JSONBuilder builder = new JSONBuilder(fw);
8 builder.object();
9 builder.key("Json");
10 builder.value("Hello, World!");
11 builder.endObject();
12 fw.flush();
13 fw.close();
14 }
15 }
二。JSONBuilder：可以把一个对象转成json的输出
GsonBuilder json=new GsonBuilder();
User user=new User();
user.setName("jjr");
String userJson=json.create().toJson(user);
三。可以写个工具类好调用
FastJsonUtil：
public class FastJsonUtil {
public static String bean2Json(Object obj) {
return JSON.toJSONString(obj);
}
public static <T> T json2Bean(String jsonStr, Class<T> objClass) {
return JSON.parseObject(jsonStr, objClass);
}
}
GsonUtil.java：
public class GsonUtil {
private static Gson gson = new GsonBuilder().create();
public static String bean2Json(Object obj) {
return gson.toJson(obj);
}
public static <T> T json2Bean(String jsonStr, Class<T> objClass) {
return gson.fromJson(jsonStr, objClass);
}
public static String jsonFormatter(String uglyJsonStr) {
Gson gson = new GsonBuilder().setPrettyPrinting().create();
JsonParser jp = new JsonParser();
JsonElement je = jp.parse(uglyJsonStr);
return gson.toJson(je);
}
}
JacksonUtil.java
public class JacksonUtil {
private static ObjectMapper mapper = new ObjectMapper();
public static String bean2Json(Object obj) {
try {
return mapper.writeValueAsString(obj);
} catch (JsonProcessingException e) {
e.printStackTrace();
return null;
}
}
public static <T> T json2Bean(String jsonStr, Class<T> objClass) {
try {
return mapper.readValue(jsonStr, objClass);
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
}
JsonLibUtil.java
public class JsonLibUtil {
public static String bean2Json(Object obj) {
JSONObject jsonObject = JSONObject.fromObject(obj);
return jsonObject.toString();
}
@SuppressWarnings("unchecked")
public static <T> T json2Bean(String jsonStr, Class<T> objClass) {
return (T) JSONObject.toBean(JSONObject.fromObject(jsonStr), objClass);
}
}
