樹狀圖java代碼 java 樹狀圖

哪位大俠可以幫我寫一段java代碼！是關(guān)于根據(jù)數(shù)據(jù)庫里的數(shù)據(jù)來形成一個動態(tài)樹形圖

這是代碼，你可以自己調(diào)試一下。

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數(shù)據(jù)結(jié)構(gòu)如下：

CREATE TABLE dtree (

id int,

pid int,

name varchar(200),

url varchar(200),

title varchar(200),

target varchar(200),

icon varchar(200),

iconopen varchar(200),

opened bit);

為了實現(xiàn)獲取數(shù)據(jù)庫變量功能，需要建立一個DTree類，并編譯生成CLASS文件，放入\WEB-INF\classes文件夾下。

DTree類代碼如下：

package work3;

public class DTree {

private int id;

private int pid;

private String name;

private String url;

private String title;

private String target;

private String icon;

private String iconOpen;

private int opened;

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public int getPid() {

return pid;

}

public void setPid(int pid) {

this.pid = pid;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getUrl() {

return url;

}

public void setUrl(String url) {

this.url = url;

}

public String getTitle() {

return title;

}

public void setTitle(String title) {

this.title = title;

}

public String getTarget() {

return target;

}

public void setTarget(String target) {

this.target = target;

}

public String getIcon() {

return icon;

}

public void setIcon(String icon) {

this.icon = icon;

}

public String getIconOpen() {

return iconOpen;

}

public void setIconOpen(String iconOpen) {

this.iconOpen = iconOpen;

}

public int getOpened() {

return opened;

}

public void setOpened(int opened) {

this.opened = opened;

}

}

work3.jsp代碼如下：

%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%

%@ page import="java.sql.*"%

jsp:useBean id='settree' scope="application" class="work3.DTree" /

!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

""

html

head

meta http-equiv="Content-Type" content="text/html; charset=GB18030"

link rel="StyleSheet" href="dtree.css" type="text/css" /

script type="text/javascript" src="dtree.js"/script

titledTree in MySQL/title

/head

body

h2

Example

/h2

div class="dtree"

p

a href="javascript: d.openAll();"open all/a |

a href="javascript: d.closeAll();"close all/a

/p

script type="text/javascript"

!--

d = new dTree('d');

%

//驅(qū)動程序名

String driverName = "com.microsoft.jdbc.sqlserver.SQLServerDriver";

//數(shù)據(jù)庫用戶名

String userName = "sa";

//密碼

String userPwd = "1";

//數(shù)據(jù)庫名

String dbName = "master";

//表名

String tableName = "dtree";

//連接字符串

String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName="+dbName;

//加載驅(qū)動

Class.forName(driverName).newInstance();

//連接數(shù)據(jù)庫

java.sql.Connection conn = DriverManager.getConnection(url,userName,userPwd);

//得到Statement實例

java.sql.Statement statement = conn.createStatement();

//查詢數(shù)據(jù)

String sql = "select * from " + tableName;

//返回結(jié)果

java.sql.ResultSet rs = statement.executeQuery(sql);

//獲取變量

while (rs.next()) {

settree.setId(rs.getInt(1));

settree.setPid(rs.getInt(2));

settree.setName(rs.getString(3));

settree.setUrl(rs.getString(4));

settree.setTitle(rs.getString(5));

settree.setTarget(rs.getString(6));

settree.setIcon(rs.getString(7));

settree.setIconOpen(rs.getString(8));

settree.setOpened(rs.getInt(9));

if(settree.getPid()==0)

settree.setOpened(1);

%

d.add(%=settree.getId()%,%=settree.getPid()%,'%=settree.getName()%','%=settree.getUrl()%','%=settree.getTitle()%','%=settree.getTarget()%','','',%=settree.getOpened()%);

%

}

%

document.write(d);

//--

/script

/div

/body

/html

用java 編寫一個程序,在命令行中以樹狀結(jié)構(gòu)展現(xiàn)特定的文件夾及其子文件(夾)!

當然在理論上是可以實現(xiàn)的，可以將所有的子文件都以樹形結(jié)構(gòu)出來，但是文件很多的時候就會非常糾結(jié)

我理解中的樹形結(jié)構(gòu)大概是這樣(不知道這樣的圖形是不是你想要的)

a

|

------------------

| | |

b c d

以下是代碼，找了系統(tǒng)盤下子文件較少的文件夾 C:/Windows/AppPatch，當然也可以換成你自己的路徑來測試

import java.io.File;

public class FileTree {

/**

* @param args

*/

public static void main(String[] args) {

try{

File file = new File("C:\\Windows\\AppPatch");

if(file.isDirectory()){

String[] fileList = file.list();

String fileName = file.getName();

int allLength = 0;

for(int i=0;ifileList.length;i++){

allLength += (fileList[i]+" ").length();

}

for(int i=0;iallLength/2;i++){

System.out.print(" ");

}

System.out.println(fileName);

for(int i=0;iallLength/2;i++){

System.out.print(" ");

}

for(int i=0;ifileName.length()/2;i++){

System.out.print(" ");

}

System.out.println("|");

for(int i=0;iallLength;i++){

System.out.print("-");

}

System.out.println("");

for(int i=0;ifileList.length;i++){

int tmpLength = fileList[i].length();

int subLength = tmpLength/2;

int lastLength = tmpLength - subLength - 1;

for(int j=0;jsubLength;j++){

System.out.print(" ");

}

System.out.print("|");

for(int j=0;jlastLength;j++){

System.out.print(" ");

}

System.out.print(" ");

}

System.out.println("");

for(int i=0;ifileList.length;i++){

System.out.print(fileList[i]+" ");

}

}

else{

System.out.println("對不起，你提供的路徑不是文件夾");

}

}

catch (Exception e) {

e.printStackTrace();

}

}

}

這時可以發(fā)現(xiàn)輸出每一個子文件/子文件夾的名字已經(jīng)比較長，要是再想輸出這些子文件夾里面的文件，那幅圖個人覺得相當糾結(jié)，也許是我水平?jīng)]夠吧或是我理解錯了你說的樹形結(jié)構(gòu)

希望以上代碼對你有幫助

請問這個樹狀圖在Java中應(yīng)該怎么做？

打個比方

可以寫一個Tree的類

public class Tree extends BaseDomain {

private String id;

private String key;

private String icon;

private String title;

private String value;

private String text;

private String code;

private String mtype;

private String type;

/**

* 部門的特殊個別字段

* 1.部門 / 2.崗位 的編碼

*/

private String number;

private Double order;

private Double sort;

private String href;

private String component;

private ListTreeT children;

private String parentId;

private boolean hasParent = false;

private boolean hasChildren = false;

private Date createTime;

private Date modifyTime;

public void initChildren(){

this.children = new ArrayList();

}

}

在寫一個工具類

public class TreeUtil {

protected TreeUtil() {

}

private final static String TOP_NODE_ID = "0";

/**

* 用于構(gòu)建菜單

*

* @param nodes nodes

* @param T ? T

* @return T TreeT

*/

public static T TreeT build(ListTreeT nodes) {

if (nodes == null) {

return null;

}

ListTreeT topNodes = new ArrayList();

nodes.forEach(node - {

String pid = node.getParentId();

if (pid == null || TOP_NODE_ID.equals(pid)) {

topNodes.add(node);

return;

}

for (TreeT n : nodes) {

String id = n.getId();

if (id != null id.equals(pid)) {

if (n.getChildren() == null)

n.initChildren();

n.getChildren().add(node);

node.setHasParent(true);

n.setHasChildren(true);

n.setHasParent(true);

return;

}

}

if (topNodes.isEmpty())

topNodes.add(node);

});

TreeT root = new Tree();

root.setId("0");

root.setParentId("");

root.setHasParent(false);

root.setHasChildren(true);

root.setChildren(topNodes);

root.setText("root");

return root;

}

}

寫完了這兩個在寫業(yè)務(wù)層

一個構(gòu)建書的方法

private void buildTrees(List trees, List menus, List ids) {

menus.forEach(menu - {

ids.add(menu.getId().toString());

Tree tree = new Tree();

tree.setId(menu.getId().toString());

tree.setKey(tree.getId());

tree.setParentId(menu.getParentId().toString());

tree.setText(menu.getName());

tree.setTitle(tree.getText());

tree.setIcon(menu.getIcon());

tree.setComponent(menu.getComponent());

tree.setCreateTime(menu.getCreateTime());

tree.setCreateTime(menu.getCreateTime());

tree.setHref(menu.getHref());

tree.setSort(menu.getSort());

tree.setCode(menu.getCode());

tree.setMtype(menu.getMtype());

trees.add(tree);

});

}

MapString, Object result = new HashMap();

ListDept depts = findDepts(dept, request);

ListTreeDept trees = new ArrayList();

buildTrees(trees, depts);

TreeDept deptTree = TreeUtil.build(trees);

result.put("rows", deptTree);

result.put("total", depts.size());

求 java 刷新 JScrollPane中jtree樹狀圖的方法

java 中actionPerformed的方法可以刷新jtree樹狀圖的，具體做法是在actionPerformed的方法尾部加上JSPcrollPanel.updateUI();

代碼如下:

import?javax.swing.JFrame;

import?javax.swing.JTree;

import?javax.swing.event.TreeSelectionEvent;

import?javax.swing.event.TreeSelectionListener;

import?javax.swing.tree.DefaultMutableTreeNode;

public?class?TreeDemo?{

public?static?void?main(String[]?args)?{

//?創(chuàng)建沒有父節(jié)點和子節(jié)點、但允許有子節(jié)點的樹節(jié)點，并使用指定的用戶對象對它進行初始化。

//?public?DefaultMutableTreeNode(Object?userObject)

DefaultMutableTreeNode?node1?=?new?DefaultMutableTreeNode("軟件部");

node1.add(new?DefaultMutableTreeNode(new?User("小花")));

node1.add(new?DefaultMutableTreeNode(new?User("小虎")));

node1.add(new?DefaultMutableTreeNode(new?User("小龍")));

DefaultMutableTreeNode?node2?=?new?DefaultMutableTreeNode("銷售部");

node2.add(new?DefaultMutableTreeNode(new?User("小葉")));

node2.add(new?DefaultMutableTreeNode(new?User("小雯")));

node2.add(new?DefaultMutableTreeNode(new?User("小夏")));

DefaultMutableTreeNode?top?=?new?DefaultMutableTreeNode("職員管理");

top.add(new?DefaultMutableTreeNode(new?User("總經(jīng)理")));

top.add(node1);

top.add(node2);

final?JTree?tree?=?new?JTree(top);

JFrame?f?=?new?JFrame("JTreeDemo");

f.add(tree);

f.setSize(300,?300);

f.setVisible(true);

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

//?添加選擇事件

tree.addTreeSelectionListener(new?TreeSelectionListener()?{

@Override

public?void?valueChanged(TreeSelectionEvent?e)?{

DefaultMutableTreeNode?node?=?(DefaultMutableTreeNode)?tree

.getLastSelectedPathComponent();

if?(node?==?null)

return;

Object?object?=?node.getUserObject();

if?(node.isLeaf())?{

User?user?=?(User)?object;

System.out.println("你選擇了："?+?user.toString());

}

}

});

}

}

class?User?{

private?String?name;

public?User(String?n)?{

name?=?n;

}

//?重點在toString，節(jié)點的顯示文本就是toString

public?String?toString()?{

return?name;

}

}

當前題目：樹狀圖java代碼 java 樹狀圖
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