java递归无级树输出json格式
java递归无级树输出json格式
由于项目需要将数据库中的一个层级表转换成json格式输出，在网上找了很久都没有找开合适的内容，要不是代码太复杂，就是不符合需求，所以就自己用递归写了一个无级树的代码。代码很简单就两个类一个TreeNode.java 和一个测试类Test.java(可直接运行) 在运行之前需要以下公共类:
commons-beanutils.jar
commons-collections.jar
commons-lang.jar
commons-logging.jar
ezmorph-1.0.6.jar
json-lib-2.3-jdk15.jar
直接贴代码：TreeNode.java
package com.test;
import java.util.ArrayList;
public class TreeNode {
private String id;
private String pid;
private String name;
private String remark;
private ArrayList
public TreeNode(String id, String pid, String name, String remark) { this.id = id;
this.pid = pid;
https://www.360docs.net/doc/6312019052.html, = name;
this.remark = remark;
}
public void add(TreeNode node) {//递归添加节点
if ("0".equals(node.pid)) {
this.children.add(node);
} else if (node.pid.equals(this.id)) {
this.children.add(node);
} else {
for (TreeNode tmp_node : children) {
tmp_node.add(node);
}
}
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
https://www.360docs.net/doc/6312019052.html, = name;
}
public String getRemark() {
return remark;
}
public void setRemark(String remark) {
this.remark = remark;
}
public ArrayList
return children;
}
public void setChildren(ArrayList
this.children = children;
}
}
测试类Test.java
package com.test;
import net.sf.json.JSONArray;
import
public
public static void main(String[] args) {
TreeNode root = new TreeNode("0", "0", "000000", "00JJJ");
TreeNode node = null;
node = new TreeNode("1", "0", "111111", "11AAA");
root.add(node);
node = new TreeNode("2", "0", "222222", "11BBB");
root.add(node);
node = new TreeNode("3", "2", "333333", "11CCC");
root.add(node);
// JSONObject obj = JSONObject.fromObject(root);//有根
JSONArray obj = JSONArray.fromObject(root.getChildren());// 不要根
System.out.println(obj.toString());
}
}