JSON 解析工具的封装（Java）
一直想有一个属于自己的JSON工具，今天终于弄好了.....
1.添加pom依赖包
<!--json解析-->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.7.4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.7.4</version>
</dependency>
2.JSONUtils.java
-
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature; import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.*; /**
* Created by 杨永生 on 2017/4/26.
*/
public class JSONUtils { private final static ObjectMapper objectMapper = new ObjectMapper(); static {
//去掉默认的时间戳格式
objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
//设置为中国上海时区
objectMapper.setTimeZone(TimeZone.getTimeZone("GMT+8"));
objectMapper.configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false);
//空值不序列化
objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
//反序列化时，属性不存在的兼容处理
objectMapper.getDeserializationConfig().withoutFeatures(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
//序列化时，日期的统一格式
objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")); objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
//单引号处理
objectMapper.configure(com.fasterxml.jackson.core.JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
} private JSONUtils() { } public static ObjectMapper getInstance() { return objectMapper;
} /**
* javaBean,list,array convert to json string
*/
public static String obj2json(Object obj){
try {
return objectMapper.writeValueAsString(obj);
}catch (Exception e){
e.printStackTrace();
}
return "";
} public static <T> T obj2obj(Object obj, Class<T> clazz){
try {
String str=obj2json(obj);
return json2pojo(str,clazz);
}catch (Exception e){
e.printStackTrace();
}
return null;
} /**
* json string convert to javaBean
*/
public static <T> T json2pojo(String jsonStr, Class<T> clazz) {
try {
return objectMapper.readValue(jsonStr, clazz);
}catch (Exception e){
e.printStackTrace();
}
return null;
} /**
* json string convert to map
*/
public static <T> Map<String, Object> json2map(String jsonStr)
throws Exception {
return objectMapper.readValue(jsonStr, Map.class);
} public static <T> T fromJson(TypeReference<T> tr,byte[] content){
T t=null;
try {
t = objectMapper.readValue(content,0, content.length, tr);
} catch (IOException e) {
e.printStackTrace();
}
return t;
} /**
* json string convert to map with javaBean
*/
public static <T> Map<String, T> json2map(String jsonStr, Class<T> clazz)
throws Exception {
Map<String, Map<String, Object>> map = objectMapper.readValue(jsonStr,
new TypeReference<Map<String, T>>() {
});
Map<String, T> result = new HashMap<String, T>();
for (Map.Entry<String, Map<String, Object>> entry : map.entrySet()) {
result.put(entry.getKey(), map2pojo(entry.getValue(), clazz));
}
return result;
} /**
* json array string convert to list with javaBean
*/
public static <T> List<T> json2list(String jsonArrayStr, Class<T> clazz)
throws Exception {
List<Map<String, Object>> list = objectMapper.readValue(jsonArrayStr,
new TypeReference<List<T>>() {
});
List<T> result = new ArrayList<T>();
for (Map<String, Object> map : list) {
result.add(map2pojo(map, clazz));
}
return result;
} /**
* map convert to javaBean
*/
public static <T> T map2pojo(Map map, Class<T> clazz) {
return objectMapper.convertValue(map, clazz);
}
}3.示例:
Article article=JSONUtils.json2pojo(tempString, Article.class);