JacksonUtils.java

package com.vcredit.framework.utils;

import java.io.IOException;
import java.util.List;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
* Jackson JSON 工具类
*/
public class JacksonUtils {
private static final ObjectMapper mapper = new ObjectMapper();

/**
* 获取Mapper 可以使用工具类没定义的方法
*/
public static ObjectMapper getMapper() {
return mapper;
}

/**
* 转换JSON为对象
*
* @param json
* @param cls
* @return T
* @throws JsonParseException
* @throws JsonMappingException
* @throws IOException
*/
public static <T> T convertObj(String json, Class<T> cls) throws JsonParseException, JsonMappingException,
IOException {
return mapper.readValue(json, cls);
}

/**
* 抓换Json为对象List
*
* @param json
* @param cls
* @return List<T>
* @throws JsonParseException
* @throws JsonMappingException
* @throws IOException
*/
public static <T> List<T> convertList(String json, Class<T> cls) throws JsonParseException, JsonMappingException,
IOException {
return mapper.readValue(json, new TypeReference<List<T>>() {
});
}

/**
* 转化JSON
*
* @param t
* @return String
* @throws JsonProcessingException
*/
public static <T> String toJson(T t) throws JsonProcessingException {
return mapper.writeValueAsString(t);
}

}