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JsonUtil.java
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113 lines (102 loc) · 3.54 KB
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package common.base.utils;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import java.util.List;
/**
* User: fee(1176610771@qq.com)
* Date: 2016-06-29
* Time: 18:21
* DESC:
*/
public final class JsonUtil {
private static ObjectMapper mapper = null;
static {
mapper = new ObjectMapper();
mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
}
private JsonUtil() {
}
/**
* 将一个Java对象转换成Json字符串表示
* @param nodeName 表示该Java对象的节点名称，eg.: user:{"name":"jack","sex":1}; 其中user:即为nodeName
* @param curObject 支持Map，List
* @return 如果nodeName为null
* @throws IOException
*/
public static String convertObject2JsonStr(String nodeName, Object curObject) throws IOException {
if (Util.isEmpty(nodeName)) {
return mapper.writeValueAsString(curObject);
}
ObjectNode rootNode = mapper.createObjectNode();
rootNode.putPOJO(nodeName, curObject);
return mapper.writeValueAsString(rootNode);
}
/**
* 将一个Java对象转换成Json字符串
* @param curObject
* @return eg.: User ==> {"name":"jack","sex":1,"city":"sz"}
* @throws IOException
*/
public static String converObject2JsonStr(Object curObject) throws IOException {
return convertObject2JsonStr(null, curObject);
}
/***
* 将一个Java对象转换成JsonObject对象(这是无聊的节奏)
* @param curObject
* @return
* @throws IOException
* @throws JSONException
*/
public static JSONObject object2JsonObject(Object curObject) throws IOException, JSONException {
String object2JsonStr = converObject2JsonStr(curObject);
return new JSONObject(object2JsonStr);
}
/**
* 将Json字符串转换成Java对象(反序列化)
* @param jsonStr
* @param javaObjClass 目标Java对象的类型
* @param <T>
* @return
* @throws IOException
*/
public static <T> T jsonStr2Object(String jsonStr, Class<T> javaObjClass) throws IOException {
return mapper.readValue(jsonStr, javaObjClass);
}
/**
* json 数组字符串 转换成List集合
* @param jsonArrayStr
* @param listTypeReference
* @param <T> 集合中元素的对象类型
* @return
*/
public static <T> List<T> jsonArrayStr2ListObject(String jsonArrayStr, TypeReference<List<T>> listTypeReference) {
try {
return mapper.readValue(jsonArrayStr, listTypeReference);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 依List中元素的Java类型将 json 数组字符串，转换成List集合
* @param jsonArrayStr
* @param elementClass List中元素的Java类型
* @param <T>
* @return
*/
public static <T> List<T> jsonArrayStr2ListObject(String jsonArrayStr, Class<T> elementClass) {
JavaType resultJavaBeanType = mapper.getTypeFactory().constructParametricType(List.class, elementClass);
try {
return mapper.readValue(jsonArrayStr, resultJavaBeanType);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}