工具类分享之《JsonUtil》

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前言

今天给大家分享的是操作json的工具类，使用的是jackson，如果你使用的是spring boot的话直接引入spring-boot-starter-parent响应的包会自动引入。

    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.5.9.RELEASE</version>    </parent>

或maven引入

<dependency>    <groupId>com.fasterxml.jackson.core</groupId>    <artifactId>jackson-databind</artifactId>    <version>2.9.2</version></dependency><dependency>    <groupId>com.fasterxml.jackson.core</groupId>    <artifactId>jackson-core</artifactId>    <version>2.9.2</version></dependency><dependency>    <groupId>com.fasterxml.jackson.core</groupId>    <artifactId>jackson-annotations</artifactId>    <version>2.9.2</version></dependency>

代码

package com.zhuma.demo.util;import java.util.ArrayList;import java.util.List;import org.springframework.util.StringUtils;import com.fasterxml.jackson.annotation.JsonInclude.Include;import com.fasterxml.jackson.core.type.TypeReference;import com.fasterxml.jackson.databind.DeserializationFeature;import com.fasterxml.jackson.databind.ObjectMapper;/** * @desc JSON操作工具类 *  * @author zhumaer * @since 6/20/2017 16:37 PM */public class JsonUtil {    private static ObjectMapper mapper = new ObjectMapper();    static {        mapper.setSerializationInclusion(Include.NON_NULL);        //设置输入时忽略JSON字符串中存在而Java对象实际没有的属性        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);    }    public static String object2Json(Object o) {        if (o == null)            return null;        String s = null;        try {            s = mapper.writeValueAsString(o);        } catch (Exception e) {            e.printStackTrace();        }        return s;    }    public static <T> List<String> listObject2ListJson(List<T> objects) {        if (objects == null)            return null;        List<String> lists = new ArrayList<String>();        for (T t : objects) {            lists.add(JsonUtil.object2Json(t));        }        return lists;    }    public static <T> List<T> listJson2ListObject(List<String> jsons, Class<T> c) {        if (jsons == null)            return null;        List<T> ts = new ArrayList<T>();        for (String j : jsons) {            ts.add(JsonUtil.json2Object(j, c));        }        return ts;    }    public static <T> T json2Object(String json, Class<T> c) {        if (StringUtils.hasLength(json) == false)            return null;        T t = null;        try {            t = mapper.readValue(json, c);        } catch (Exception e) {            e.printStackTrace();        }        return t;    }    @SuppressWarnings("unchecked")    public static <T> T json2Object(String json, TypeReference<T> tr) {        if (StringUtils.hasLength(json) == false)            return null;        T t = null;        try {            t = (T) mapper.readValue(json, tr);        } catch (Exception e) {            e.printStackTrace();        }        return (T) t;    }}

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