java将json树形结构转成表格结构

在项目中，我们有时需要使用二叉树来实现多级表格的递归遍历查询，如果对二叉树比较懂，那么写起来其实也不费事，为了节省开发时间，下面介绍一下第三方库TreeTableView-master，这个三方库上给了一些静态的数据展示可供参考。

然而，在实际项目中，数据返回的很多都是json数据，需要自己递归遍历整理后，再将数据传递给TreeTableView作为数据源来实现多级列表。

Github下载地址：https://github.com/yixiangboy/TreeTableView

静态数据测试：

//----------------------------------中国的省地市关系图3,2,1--------------------------------------------
Node *country1 = [[Node alloc] initWithParentId:-1 nodeId:0 name:@"中国" depth:0 expand:YES];
Node *province1 = [[Node alloc] initWithParentId:0 nodeId:1 name:@"江苏" depth:1 expand:NO];
Node *city1 = [[Node alloc] initWithParentId:1 nodeId:2 name:@"南通" depth:2 expand:NO];
Node *city2 = [[Node alloc] initWithParentId:1 nodeId:3 name:@"南京" depth:2 expand:NO];
Node *city3 = [[Node alloc] initWithParentId:1 nodeId:4 name:@"苏州" depth:2 expand:NO];
Node *province2 = [[Node alloc] initWithParentId:0 nodeId:5 name:@"广东" depth:1 expand:NO];
Node *city4 = [[Node alloc] initWithParentId:5 nodeId:6 name:@"深圳" depth:2 expand:NO];
Node *city5 = [[Node alloc] initWithParentId:5 nodeId:7 name:@"广州" depth:2 expand:NO];
Node *province3 = [[Node alloc] initWithParentId:0 nodeId:8 name:@"浙江" depth:1 expand:NO];
Node *city6 = [[Node alloc] initWithParentId:8 nodeId:9 name:@"杭州" depth:2 expand:NO];
//----------------------------------美国的省地市关系图0,1,2--------------------------------------------
Node *country2 = [[Node alloc] initWithParentId:-1 nodeId:10 name:@"美国" depth:0 expand:YES];
Node *province4 = [[Node alloc] initWithParentId:10 nodeId:11 name:@"纽约州" depth:1 expand:NO];
Node *province5 = [[Node alloc] initWithParentId:10 nodeId:12 name:@"德州" depth:1 expand:NO];
Node *city7 = [[Node alloc] initWithParentId:12 nodeId:13 name:@"休斯顿" depth:2 expand:NO];
Node *province6 = [[Node alloc] initWithParentId:10 nodeId:14 name:@"加州" depth:1 expand:NO];
Node *city8 = [[Node alloc] initWithParentId:14 nodeId:15 name:@"洛杉矶" depth:2 expand:NO];
Node *city9 = [[Node alloc] initWithParentId:14 nodeId:16 name:@"旧金山" depth:2 expand:NO];

//----------------------------------日本的省地市关系图0,1,2--------------------------------------------
Node *country3 = [[Node alloc] initWithParentId:-1 nodeId:17 name:@"日本" depth:0 expand:YES];
NSArray *data = [NSArray arrayWithObjects:country1,province1,city1,city2,city3,province2,city4,city5,province3,city6,country2,province4,province5,city7,province6,city8,city9,country3, nil];

TreeTableView *tableview = [[TreeTableView alloc] initWithFrame:CGRectMake(0, 20, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.view.frame)-20) withData:data];
  tableview.treeTableCellDelegate = self;
 [self.view addSubview:tableview];

结果截图显示：

 

Github上介绍的比较详细，可以自己去看一下。

下面我来对他进行灵活的扩展，对json数据解析递归整理后，使用它利用二叉树的特点实现多级表格显示：

后台返回的json数据格式如下，每一个知识点都有自己的属性，son是用做判断是否有子知识点的条件，son1是子知识点,pid是当前知识点的父节点，knowid是当前知识点的节点，depth是当前知识点的深度等等：

2016-06-22 12:04:28.622 Point[1163:71939] {
    data =     (
                {
            id = 3067;
            knowid = 6582;
            name = "\U6570\U4e0e\U5f0f";
            pid = 13;
            pidA = "0-2-13";
            qNum = 123462;
            son = 1;
            son1 =             (
                                {
                    depth = 1;
                    id = 3068;
                    knowid = 6583;
                    name = "\U6709\U7406\U6570";
                    pid = 6582;
                    pidA = "0-2-13-6582";
                    qNum = 35487;
                    son = 1;
                    son1 =                     (
                                                {
                            depth = 2;
                            id = 3069;
                            knowid = 6584;
                            name = "\U6709\U7406\U6570\U7684\U51e0\U4e2a\U6982\U5ff5";
                            pid = 6583;
                            pidA = "0-2-13-6582-6583";
                            qNum = 14812;
                            son = 1;
                            son1 =                             (
                                                                {
                                    depth = 3;
                                    id = 3070;
                                    knowid = 6585;
                                    name = "\U6b63\U6570\U4e0e\U8d1f\U6570";
                                    pid = 6584;
                                    pidA = "0-2-13-6582-6583-6584";
                                    qNum = 2276;
                                    son = 0;
                                    url = "http://192.168.0.200//api.php/task1_2/taskadd1_2.html?id=6585&uid=12709";
                                },
.....................................................................
.....................................................................

创建知识点实例KJPoint如下：

//  KJPoint.h
//  Point
//  Created by mac on 16/6/21.
//  Copyright © 2016年 mac. All rights reserved.

#import <Foundation/Foundation.h>

@interface KJPoint : NSObject

@property (copy,nonatomic)NSString  *point_depth;  //知识点深度
@property (assign,nonatomic)BOOL    point_expand;  //知识点展开与否

@property (copy,nonatomic)NSString  *point_id;
@property (copy,nonatomic)NSString  *point_knowid;
@property (copy,nonatomic)NSString  *point_name;
@property (copy,nonatomic)NSString  *point_pid;
@property (copy,nonatomic)NSString  *point_pidA;
@property (copy,nonatomic)NSString  *point_qNum;
@property (copy,nonatomic)NSString  *point_url;
@property (copy,nonatomic)NSString  *point_son;  //作为判断是否有子节点的条件
@property (strong,nonatomic)NSArray *point_son1; //子知识点

-(instancetype)initWithPointDic:(NSDictionary *)pointDic;

@end



//  KJPoint.m
//  Point
//  Created by mac on 16/6/21.
//  Copyright © 2016年 mac. All rights reserved.

#import "KJPoint.h"

@implementation KJPoint

-(instancetype)initWithPointDic:(NSDictionary *)pointDic{
    self = [super init];
    if (self) {
        _point_id = [pointDic[@"id"] copy];
        _point_depth = [pointDic[@"depth"] copy];
        _point_knowid = [pointDic[@"knowid"] copy];
        _point_name = [pointDic[@"name"] copy];
        _point_pid = [pointDic[@"pid"] copy];
        _point_pidA = [pointDic[@"pidA"] copy];
        _point_url = [pointDic[@"url"] copy];
        _point_qNum = [pointDic[@"qNum"] copy];
        _point_son = [pointDic[@"son"] copy];
        _point_son1 = pointDic[@"son1"];
    }
    return self;
}

@end

创建控制器实现效果，KJPointViewController类

//  ViewController.h
//  Point
//  Created by mac on 16/6/21.
//  Copyright © 2016年 mac. All rights reserved.

#import <UIKit/UIKit.h>
@interface KJPonitViewController : UIViewController
@end


//  ViewController.m
//  Point
//
//  Created by mac on 16/6/21.
//  Copyright © 2016年 mac. All rights reserved.
//

#import "KJPonitViewController.h"
#import "HttpTool/KJHttpTool.h"
#import "KJPoint.h"
#import "TreeTableView.h"
#import "Node.h"
@interface KJPonitViewController ()<TreeTableCellDelegate>
@property (strong,nonatomic)NSMutableArray *Points;
@property (strong,nonatomic)NSMutableArray *allPoints;
@end

@implementation KJPonitViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    //获取知识点
    [self initPoints];
}

-(void)initPoints{
 
    //封装参数
    _Points = [NSMutableArray array];
    _allPoints = [NSMutableArray array];
    NSMutableDictionary *params = [NSMutableDictionary dictionary];
    params[@"uid"] = @"12709";  //用户id
    params[@"grade"] = @"0";    //学段：0代表初中、1代表高中//发送请求
    [KJHttpTool getWithURL:Point_URL params:params success:^(id json) {
        NSLog(@"%@",json);
        
        [json[@"data"] enumerateObjectsUsingBlock:^(NSDictionary *pointDic, NSUInteger idx, BOOL * _Nonnull stop) {
           KJPoint *point = [[KJPoint alloc]initWithPointDic:pointDic];
           point.point_depth = @"0";
           point.point_expand = YES;
           [_Points addObject:point];
        }];
        [self recursiveAllPoints:_Points];
        
//        //打印输出
//        [_allPoints enumerateObjectsUsingBlock:^(KJPoint *point, NSUInteger idx, BOOL * _Nonnull stop) {
//            NSLog(@"%@____%@___%d",point.point_name,point.point_depth,point.point_expand);
//        }];
        
        //创建Node节点
        NSMutableArray *nodes = [NSMutableArray array];
        [_allPoints enumerateObjectsUsingBlock:^(KJPoint *point, NSUInteger idx, BOOL * _Nonnull stop) {

//            NSLog(@"%@----%@----%@",point.point_name,point.point_knowid,point.point_pid);
            
            Node *node = [[Node alloc] initWithParentId:[point.point_pid integerValue] nodeId:[point.point_knowid integerValue] name:point.point_name depth:[point.point_depth integerValue] expand:point.point_expand];
            [nodes addObject:node];
        }];
        
        //TreeTableView
        TreeTableView *tableview = [[TreeTableView alloc] initWithFrame:CGRectMake(0, 20, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.view.frame)-20) withData:nodes];
        tableview.treeTableCellDelegate = self;
        [self.view addSubview:tableview];
        
    } failure:^(NSError *error) {
        NSLog(@"%@",error);
    }];
}

//递归所有的知识点
-(void)recursiveAllPoints:(NSMutableArray *)point_arrM{
    
    [point_arrM enumerateObjectsUsingBlock:^(KJPoint *point, NSUInteger idx, BOOL * _Nonnull stop) {
        [_allPoints addObject:point];
        
        if ([point.point_son isEqualToString:@"1"]) {
            NSMutableArray *sonPoints = [NSMutableArray array];
            [point.point_son1 enumerateObjectsUsingBlock:^(NSDictionary *pointDic, NSUInteger idx, BOOL * _Nonnull stop) {
                KJPoint *point = [[KJPoint alloc]initWithPointDic:pointDic];
                point.point_expand = NO;
                [sonPoints addObject:point];
            }];
            [self recursiveAllPoints:sonPoints];
        }
    }];
}

#pragma mark - TreeTableCellDelegate
-(void)cellClick:(Node *)node{
    NSLog(@"%@----%ld-----%ld------%ld",node.name,node.parentId,(long)node.nodeId,(long)node.depth);
}
@end

说明：以后不论参数怎么变，不论是三级还是四级表格，都可以自动轻松实现

效果截图如下：

  

提示：自己先和后台商量好如何json数据格式如何返回，目的是方便自己整理

程序猿神奇的手，每时每刻，这双手都在改变着世界的交互方式！