使用google gson对json字符串和Java对象进行转换

使用google gson对json字符串和Java对象进行转换

java对象转换为json字符串

转换代码

/**
 * @author  四个空格-https://www.4spaces.org/
 */
public class JavaToJsonDemo {
    public static void main(String[] args) {
        Person jack = new Person();
        jack.setName("Jack");
        jack.setAge(1);
        Person michael = new Person();
        michael.setName("Michael");
        jack.setAge(5);
        Gson gson = new Gson();
        //示例1
        System.out.println("================示例1==========");
        System.out.println(gson.toJson(jack));

        Company myCompany = new Company();
        myCompany.setAddress("山东济南");
        List<Person> personList = new ArrayList<>();
        personList.add(jack);
        personList.add(michael);
        myCompany.setEmployees(personList);

        //示例2
        System.out.println("================示例2==========");
        System.out.println(gson.toJson(personList));

        //示例3
        System.out.println("================示例3==========");
        System.out.println(gson.toJson(myCompany));

    }
}

输出结果

================示例1==========
{"name":"Jack","age":5}
================示例2==========
[{"name":"Jack","age":5},{"name":"Michael","age":0}]
================示例3==========
{"address":"山东济南","employees":[{"name":"Jack","age":5},{"name":"Michael","age":0}]}

json字符串转换为Java对象

• 示例1

{"name":"Michael","age":2}

转换代码：

Gson gson = new Gson();
Person michael = gson.fromJson("{\"name\":\"Michael\",\"age\":2}",Person.class);
System.out.println(michael.getAge());

• 示例2

{"status":"0","msg":"","data":[{"GMSFHM":"3890871234","XM":"王**","XB":"男","MZ":"汉","CSRQ":"1993","CSD_GJHDQ":"出生地国家（地区）","CSD_SSXQ":"出生地省市县（区）","CSD_QHNXXDZ":出生地详址,"JG_GJHDQ":"籍贯国家（地区）","JG_SSXQ":"籍贯省市县（区）","WHCD":"文化程度","HYZK":"婚姻状况","BYZK":"兵役状况","SG":"177","ZY":"职业","FWCS":"服务处所","HJD_SSXQ":"户籍地址省市县（区）","HJD_QHNXXDZ":"户籍地址详址","ZXBZ":"注销标识","PCS":"所属公安机关名称"}]}

转换代码：

String jsonStr = "{\"status\":\"0\",\"msg\":\"\",\"data\":[{\"GMSFHM\":\"3890871234\",\"XM\":\"王**\",\"XB\":\"男\",\"MZ\":\"汉\",\"CSRQ\":\"1993\",\"CSD_GJHDQ\":\"出生地国家（地区）\",\"CSD_SSXQ\":\"出生地省市县（区）\",\"CSD_QHNXXDZ\":出生地详址,\"JG_GJHDQ\":\"籍贯国家（地区）\",\"JG_SSXQ\":\"籍贯省市县（区）\",\"WHCD\":\"文化程度\",\"HYZK\":\"婚姻状况\",\"BYZK\":\"兵役状况\",\"SG\":\"177\",\"ZY\":\"职业\",\"FWCS\":\"服务处所\",\"HJD_SSXQ\":\"户籍地址省市县（区）\",\"HJD_QHNXXDZ\":\"户籍地址详址\",\"ZXBZ\":\"注销标识\",\"PCS\":\"所属公安机关名称\"}]}";
HjxxResult result = gson.fromJson(jsonStr, HjxxResult.class);
if ("0".equals(result.getStatus())) {
    List<Hjxx> hjxxList = result.getData();
    //入库
    if (hjxxList != null && hjxxList.size() > 0) {
        for (Hjxx hjxx : hjxxList) {
            System.out.println(hjxx.getMZ());
        }
    }
}

示例代码

https://github.com/aitlp/gsonDemos；

参考：

1. https://my.oschina.net/itblog/blog/204120；
2. http://qingkechina.blog.51cto.com/5552198/1290500；
3. http://wl9739.github.io/2017/01/13/Gson-%E4%B8%AD%E6%96%87%E6%8C%87%E5%8D%97/；
4. https://blog.csdn.net/fang323619/article/details/42874503 ；