Json工具类 ---JsonUtil

import java.io.IOException;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonUtil {
private static ObjectMapper objectMapper = new ObjectMapper();

public static <T> String entity2Json(T t) {
String json = null;
try {
json = objectMapper.writeValueAsString(t);
} catch (JsonProcessingException e) {
e.printStackTrace();
}
return json;
}

public static <T> T json2Entity(String json, Class<T> clazz) {
T t = null;
try {
t = objectMapper.readValue(json, clazz);
} catch (JsonParseException e) {
e.printStackTrace();
} catch (JsonMappingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return t;
}

@SuppressWarnings("unchecked")
public static <T> T json2Entity(String json, String reqName, boolean isReq) {
T t = null;
try {
Class<T> clazz = (Class<T>) Class.forName(reqName);
t = json2Entity(json, clazz);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
return t;
}

/**
* 返回类型自定义，可返回数组
*
* @param jsonVal
* @param clazz
* @return
*/
public static <T> Object json2Object(String jsonVal, Class<T> clazz) {
try {
return objectMapper.readValue(jsonVal, clazz);
} catch (JsonParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JsonMappingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}

}