树格式数据的构造(Java拼接)

1.导入json相关的jar包

2.JsonTreeHelper.java

3.调用getTreeJsonStr方法:

      nodesNameBySeq:待分组的节点名称.将树节点对应的实体类的成员名称放到此数组里面,顺序是{"根节点","子节点1","子节点2"...}
      data:数据列表,List<实体类> data ; 

说明:树默认是节点关闭状态,json中只有id,text,state字段

编写原理:

1).首先用groupByNodeName将数据分组

        用Java中的Field进行字段比较,来获得相对应的成员字段,以及成员变量的名称,这里要用getDeclaredFields方法来获得,否则,private声明的成员是无法得到Field的

        将得到的fieldIndex全部放到数组中保存,便于以后的使用,field[fieldIndex]可以得到相应的字段

2).构造一个tree的json形式的类:里面有几个重要的成员:{id,text,state}这种形式用JsonObject.fromObject(jsonObj}能直接转换为tree所需要的json,并且,这个类中要有一

        个children字段,保存子节点的数据

3).recursiveTree方法

       # 此方法内要递归遍历树,返回一个list,list中是一个JsonTreeObj自定义的一个类,其中的children还可以保存一个JsonTreeObj,这样就可以实现嵌套

       #在递归之前,首先要有一个成员变量(全局变量)来记录要分组的节点索引

      先进行一次分组,得到的map就是JsonTreeObj,通过构造方法可以实现转换,这样,转换过来的JsonTreeObj才是我们的Tree-json,但这只是一次调用

      是否再次分组,要用事先准备好的    fieldIndex长度或者nodesNameBySeq进行判断,如果要继续分组,那么需要移除map中每条数据中的list并重新分组成map.

      即:用新分组的List替换以前未分组的List

      返回之后,返回分组好的JsonTreeObj数据,此时的list差不多和需要的json相仿但是,还要做下字符串的调整

4).replaceText

      用此方法来替换最深层节点的文本,否则字段中无text,会出现undefine

4.示例

1)要构造的树

2)要构造的json

[
    {
        "children": [
            {
                "children": [
                    {
                        "children": [
                            {
                                "address": "bj",
                                "text": "id1",
                                "name": "wang'ao1",
                                "occupation": "student"
                            }
                        ],
                        "id": "0.5715806450144063",
                        "state": "closed",
                        "text": "student"
                    }
                ],
                "id": "0.4010186645348438",
                "state": "closed",
                "text": "bj"
            },
            {
                "children": [
                    {
                        "children": [
                            {
                                "address": "bj11",
                                "text": "id12",
                                "name": "wang'ao1",
                                "occupation": "student"
                            }
                        ],
                        "id": "0.188373241944635",
                        "state": "closed",
                        "text": "student"
                    },
                    {
                        "children": [
                            {
                                "address": "bj11",
                                "text": "id11",
                                "name": "wang'ao1",
                                "occupation": "teacher"
                            }
                        ],
                        "id": "0.9566645560486874",
                        "state": "closed",
                        "text": "teacher"
                    }
                ],
                "id": "0.6062106288555755",
                "state": "closed",
                "text": "bj11"
            }
        ],
        "id": "0.6856242232995936",
        "state": "closed",
        "text": "wang'ao1"
    },
    {
        "children": [
            {
                "children": [
                    {
                        "children": [
                            {
                                "address": "bj",
                                "text": "id1",
                                "name": "wang'ao",
                                "occupation": "student"
                            }
                        ],
                        "id": "0.5044856120294572",
                        "state": "closed",
                        "text": "student"
                    }
                ],
                "id": "0.2021652373692504",
                "state": "closed",
                "text": "bj"
            },
            {
                "children": [
                    {
                        "children": [
                            {
                                "address": "bj11",
                                "text": "id12",
                                "name": "wang'ao",
                                "occupation": "student"
                            }
                        ],
                        "id": "0.7096934456298796",
                        "state": "closed",
                        "text": "student"
                    },
                    {
                        "children": [
                            {
                                "address": "bj11",
                                "text": "id11",
                                "name": "wang'ao",
                                "occupation": "teacher"
                            }
                        ],
                        "id": "0.8679325026402117",
                        "state": "closed",
                        "text": "teacher"
                    }
                ],
                "id": "0.6940289758188156",
                "state": "closed",
                "text": "bj11"
            }
        ],
        "id": "0.08304442224761122",
        "state": "closed",
        "text": "wang'ao"
    }
]

3)实体类

/**
 * @author wang'ao
 *
 */
public class TestEntity {

	private String name ;
	private String ids ;
	private String address ;
	private String occupation ;
	
	public String getOccupation() {
		return occupation;
	}
	public void setOccupation(String occupation) {
		this.occupation = occupation;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getIds() {
		return ids;
	}
	public void setId(String ids) {
		this.ids = ids;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	
	public TestEntity(String name, String ids, String address, String occupation) {
		super();
		this.name = name;
		this.ids = ids;
		this.address = address;
		this.occupation = occupation;
	}
	@Override
	public String toString() {
		return "TestEntity [name=" + name + ", id=" + ids + ", address="
				+ address + "]";
	}
	
	
}

4)测试

/**
 * @author wang'ao
 * 
 */
public class Test {
	public static void main(String[] args) throws SecurityException,
			NoSuchMethodException, IllegalArgumentException,
			IllegalAccessException, InvocationTargetException {
		TestEntity te1 = new TestEntity("wang'ao","id1","bj","student") ;
		TestEntity te2 = new TestEntity("wang'ao","id11","bj11","teacher") ;
		TestEntity te3 = new TestEntity("wang'ao","id12","bj11","student") ;
		
		TestEntity te4 = new TestEntity("wang'ao1","id1","bj","student") ;
		TestEntity te5 = new TestEntity("wang'ao1","id11","bj11","teacher") ;
		TestEntity te6 = new TestEntity("wang'ao1","id12","bj11","student") ;
		List