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提示：以下是本篇文章正文内容，下面案例可供参考

一、json的接收与发送

1.postman工具发送格式

//json样式
{
	"className": "班级名称",
	"classCode": "班级编码",
	"classLevel": 1,
	"OneManySub01": [{
			"classId": "1",
			"name": "姓名1",
			"age": "22",
			"sex": "1"
		},
		{
			"classId": "2",
			"name": "姓名2",
			"age": "23",
			"sex": "0"
		}
	],
	"OneManySub02": [{
			"classId": 1,
			"subjectName": "科目名称",
			"subjectType": "2"
		},
		{
			"classId": 2,
			"subjectName": "科目名称",
			"subjectType": "1"
		}
	]
}

2.controller接收处理

  /**
     * 新增数据
     * @return
     */
    @ApiOperation("新增数据")
    @RequestMapping("/insetOneManyMain")
    public Object insetManyMain(@RequestBody JSONObject json){
        JSONObject object = new JSONObject();
        try {
        /*
           班级名称
         */
            String className = json.getString("className");
         /*
           班级编码
         */
            String classCode = json.getString("classCode");
         /*
           班级级别
         */
            Integer classLevel = json.getInteger("classLevel");
         /*
           默认登录人
         */
            String login="数飞";
        /*
        设置当前新增时间
         */
            SimpleDateFormat time=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//修改格式
            Date date = new Date();//new 当前时间
            //解析OneManySub01
            List<OneManySub01> oneManySub01s = json.getJSONArray("OneManySub01").toJavaList(OneManySub01.class);
            //解析OneManySub02
            List<OneManySub02> oneManySub02s = json.getJSONArray("OneManySub02").toJavaList(OneManySub02.class);
            //循环解析数据保存
            OneManySub01 manySub011 = new OneManySub01();
            for (OneManySub01 manySub01 : oneManySub01s) {
                manySub011.setClassId(manySub01.getClassId());
                manySub011.setName(manySub01.getName());
                manySub011.setAge(manySub01.getAge());
                manySub011.setSex(manySub01.getSex());
                tSUserService.insertOneManySub01(manySub011);
            }
            OneManySub02 manySub021 = new OneManySub02();
            for (OneManySub02 manySub02 : oneManySub02s) {
                manySub021.setClassId(manySub02.getClassId());
                manySub021.setSubjectName(manySub02.getSubjectName());
                manySub021.setSubjectType(manySub02.getSubjectType());
                tSUserService.insertOneManySub02(manySub021);
            }
            OneManyMain manyMain = new OneManyMain();
            manyMain.setClassName(className);
            manyMain.setClassCode(classCode);
            manyMain.setClassLevel(classLevel);
            manyMain.setCreAtor(login);
            manyMain.setCreateTime(time.format(date));
            boolean fan=tSUserService.inserOneManyMain(manyMain);
            if (fan){
                object.put("code",200);
                object.put("执行数据量",1);
                object.put("msg","操作成功");
                return object;
            }else {
                object.put("code",0);
                object.put("执行数据量",0);
                object.put("msg","新增失败请稍后再试");
                return object;
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }

二、查询集合数据

1.利用mybatis-plus进行分页处理

    /**
     * 条件匹配
     */
    @RequestMapping("/matching")
    public TableDataInfo listmatching(OneManyMain OneManyMain){
        startPage();
        List<OneManyMain> list =  tSUserService.listmatching(OneManyMain);
       return getDataTable(list);
    }

封装类的处理：因为是多表查询所以需要将其他表集合配置里面

三.读取数据配置mapper.xml

//type 主表就不在说了 id等后面配置resultMap用的
 <resultMap type="com.inspur.crane.platform.domain.OneManyMain" id="OneManyMain">
        <id column="id" property="id"></id>
        <result property="className" column="class_name"/>
        <result property="classCode" column="class_code"/>
        <result property="classLevel" column="class_level"/>
        <result property="creAtor" column="creator"/>
        <result property="createTime" column="create_time"/>
        <result property="modiFor" column="modifor"/>
        <result property="modifyTime" column="modify_time"/>
        <result property="logo" column="logo"/>
        <!--
        进行数据关联
        property="在主表中配置的名称" javaType="List集合" ofType="封装名"
			-->
        <collection property="oneManySub01s" javaType="List" ofType="OneManySub01">
            <id column="id" property="id"></id>
            <result column="class_id" property="classId"></result>
            <result column="name" property="name"></result>
            <result column="age" property="age"></result>
            <result column="sex" property="sex"></result>
        </collection>
        <!--进行数据关联-->
        <collection property="oneManySub02s" javaType="List" ofType="OneManySub02">
            <id column="id" property="id"></id>
            <result column="class_id" property="classId"></result>
            <result column="subject_name" property="subjectName"></result>
            <result column="subject_type" property="subjectType"></result>
        </collection>
    </resultMap>

添加条件以及resultMap

   <select id="listmatching"  resultMap="OneManyMain">
        SELECT *  FROM `one_many_main` man LEFT JOIN one_many_sub_01 sua ON man.class_code=sua.class_id LEFT JOIN one_many_sub_02 sub on sua.class_id=sub.class_id
        <where>
            <if test="className != null "> and class_name = #{className}</if>
        </where>
    </select>

输出结果

{
    "total": 2,
    "rows": [
        {
            "id": 2,
            "className": "一班级",
            "classCode": "1",
            "classLevel": 1,
            "creAtor": "数飞",
            "createTime": "2022-12-13 09:38:41",
            "modiFor": null,
            "modifyTime": null,
            "logo": null,
            "oneManySub01s": [
                {
                    "id": 2,
                    "classId": 1,
                    "name": "张三",
                    "age": 22,
                    "sex": 1
                }
            ],
            "oneManySub02s": [
                {
                    "id": 2,
                    "classId": 1,
                    "subjectName": "专科",
                    "subjectType": 2
                }
            ]
        }
    ],
    "code": 200,
    "msg": "查询成功"
}