实现动态ztree生成树状图效果,需要涉及到Spring+Spring MVC+Hibernate的技术栈。下面是实现该功能的完整攻略:
1. 搭建项目框架
首先,我们需要搭建一个SpringMVC的项目,也就是创建一个maven工程。在pom.xml中添加spring、springMVC和hibernate的依赖。
<dependencies>
<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- hibernate -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${hibernate.version}</version>
</dependency>
</dependencies>
2. 数据库建表
为了实现树状图的效果,我们需要在数据库中建立一个相应的表。我们为了方便,这里只建立一个简单的表,如下:
CREATE TABLE `tree` (
`id` INT(11) NOT NULL AUTO_INCREMENT COMMENT '主键',
`pId` INT(11) DEFAULT NULL COMMENT '父节点',
`name` VARCHAR(50) DEFAULT NULL COMMENT '节点名称',
PRIMARY KEY (`id`)
) COMMENT='动态生成树结构demo';
3. 实体类
接下来,我们需要定义一个实体类来代表数据库中的表。可以参考如下代码:
@Entity
@Table(name = "tree")
public class Tree {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private Integer pId;
private String name;
// getters and setters...
}
4. Dao层和Service层
为了实现树状图的效果,我们需要根据pid查询对应的节点,然后将所有节点按照树状结构排列。因此,需要定义相应的dao层和service层。可以参考如下代码:
Dao层
@Repository
public class TreeDaoImpl implements TreeDao {
@Autowired
private SessionFactory sessionFactory;
@Override
public List<Tree> findByPid(Integer pid) {
String hql = "from Tree where pId = ?";
Query query = sessionFactory.getCurrentSession().createQuery(hql);
query.setParameter(0, pid);
return query.list();
}
}
Service层
@Service
public class TreeServiceImpl implements TreeService {
@Autowired
private TreeDao treeDao;
@Transactional
@Override
public List<Tree> find(Integer pid) {
List<Tree> treeList = treeDao.findByPid(pid);
if (!CollectionUtils.isEmpty(treeList)) {
for (Tree tree : treeList) {
Integer id = tree.getId();
List<Tree> tmpList = find(id);
if (!CollectionUtils.isEmpty(tmpList)) {
tree.setChildren(tmpList);
}
}
}
return treeList;
}
}
5. Controller层和前端页面
最后,我们需要定义一个Controller层的Java类来映射前端页面所需要的请求。可以参考如下代码:
Controller层
@Controller
@RequestMapping("/tree")
public class TreeController {
@Autowired
private TreeService treeService;
@RequestMapping(value = "/initTree", method = RequestMethod.GET)
@ResponseBody
public List<Tree> initTree(@RequestParam(value = "pid", required = false, defaultValue = "0") Integer pid) {
return treeService.find(pid);
}
@RequestMapping(value = "/index", method = RequestMethod.GET)
public String index() {
return "index";
}
}
前端页面
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>树状结构demo</title>
<link href="https://cdn.bootcdn.net/ajax/libs/zTree.v3/3.5.69/css/zTreeStyle/zTreeStyle.css" rel="stylesheet">
</head>
<body>
<div id="tree"></div>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script src="https://cdn.bootcdn.net/ajax/libs/zTree.v3/3.5.69/js/jquery.ztree.all.min.js"></script>
<script>
$(function () {
$.ajax({
url: "tree/initTree",
data: "pid=0",
dataType: "json",
success: function (data) {
if (data != null && data.length > 0) {
var zNodes = [];
$.each(data, function (index, item) {
zNodes.push({
id: item.id,
pId: item.pId,
name: item.name,
open: true
});
});
var setting = {
view: {
dblClickExpand: false
},
data: {
simpleData: {
enable: true
}
}
};
var t = $("#tree");
t = $.fn.zTree.init(t, setting, zNodes);
}
}
});
});
</script>
</body>
</html>
6. 示例
以上就是实现动态ztree生成树状图效果的完整攻略。为了更好地理解这个过程,下面提供两条示例。
- 示例1
我们需要创建一个名为ABC的节点,这个节点是id=0的节点的子节点。
Tree node = new Tree();
node.setPid(0);
node.setName("ABC");
treeService.save(node);
- 示例2
我们需要删除一个节点,这个节点是id=1的节点。
Tree node = treeService.find(1);
treeService.delete(node);
希望这些示例可以更好地帮助您理解这个过程。
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