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JsonHelper.java
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84 lines (72 loc) · 2.7 KB
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package utils;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.datatype.jsr310.JSR310Module;
import org.apache.commons.lang3.StringUtils;
import java.io.IOException;
public class JsonHelper {
private JsonHelper() {
super();
}
private static ObjectMapper mapper = new ObjectMapper();
static {
mapper.registerModule(new JSR310Module());
mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
}
public static <T> String toJsonString(T t) throws JsonProcessingException {
if (null == t) {
return null;
}
return getInstance().writeValueAsString(t);
}
/**
* java对象转换方法
* List或Map类型的复杂对象，见
* {@link #toJsonObject} (String jsonString, Class<?> collectionType, Class<?>... elementType)
*
* @param jsonString
* @param clazz
* @return
* @throws JsonParseException
* @throws JsonMappingException
* @throws IOException
*/
public static <T> T toJsonObject(String jsonString, Class<T> clazz) throws JsonParseException, JsonMappingException, IOException {
if (StringUtils.isBlank(jsonString)) {
return null;
}
return getInstance().readValue(jsonString, clazz);
}
/**
* 解析复杂对象方法
* 可以解析List或Map的复杂对象
*
* @param jsonString
* @param collectionType
* @param elementType
* @return
* @throws JsonParseException
* @throws JsonMappingException
* @throws IOException
*/
public static <T> T toJsonObject(String jsonString, Class<?> collectionType, Class<?>... elementType) throws JsonParseException, JsonMappingException, IOException {
if (StringUtils.isBlank(jsonString)) {
return null;
}
JavaType javaType = constructParametricType(collectionType, elementType);
return getInstance().readValue(jsonString, javaType);
}
private static JavaType constructParametricType(Class<?> collectionType, Class<?>... elementType) {
return getInstance().getTypeFactory().constructParametrizedType(collectionType, collectionType, elementType);
}
private static ObjectMapper getInstance() {
if (null == mapper) {
mapper.registerModule(new JSR310Module());
mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
}
return mapper;
}
}