数据图java代码,JAVA图

哪位大侠可以帮我写一段java代码!是关于根据数据库里的数据来形成一个动态树形图

这是代码,你可以自己调试一下。

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数据结构如下:

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);

为了实现获取数据库变量功能,需要建立一个DTree类,并编译生成CLASS文件,放入\WEB-INF\classes文件夹下。

DTree类代码如下:

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代码如下:

%@ 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');

%

//驱动程序名

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

//数据库用户名

String userName = "sa";

//密码

String userPwd = "1";

//数据库名

String dbName = "master";

//表名

String tableName = "dtree";

//连接字符串

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

//加载驱动

Class.forName(driverName).newInstance();

//连接数据库

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

//得到Statement实例

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

//查询数据

String sql = "select * from " + tableName;

//返回结果

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

//获取变量

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

Java怎么读取图中的数据,而且不乱码?希望附带代码

不知道你的文件格式,不过你可以可以尝试用io流来读取。下面代码 我试过是可以读取挺多格式文件的,你试下 拷贝过去改下文件路径就行了。

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class ReadFile

{

public static void main(String[] args)

{

//文件位置

String filepath = "D:\\test.pub";

/** 一次读取所有内容 */

FileInputStreamReadFile(filepath);

System.out.println("=====================");

/** 以行为单位读取文件,常用于读面向行的格式化文件 */

BufferedReaderReadFile(filepath);

System.out.println("=====================");

/** 以字节为单位读取文件,常用于读二进制文件,如图片、声音、影像等文件。 */

ReadFileByByte(filepath);

System.out.println("\n=====================");

/** 以行为单位读取文件,常用于读面向行的格式化文件 */

InputSteamReaderReadFile(filepath);

System.out.println("\n=====================");

}

private static void InputSteamReaderReadFile(String filepath)

{

try

{

InputStreamReader sr = new InputStreamReader(new FileInputStream(new File(filepath)));

int temp = 0;

while ((temp = sr.read()) != -1)

{

System.out.print((char)temp);

}

sr.close();

}

catch (FileNotFoundException e)

{

e.printStackTrace();

}

catch (IOException e)

{

e.printStackTrace();

}

}

private static void ReadFileByByte(String filepath)

{

try

{

File file = new File(filepath);

FileInputStream fis = new FileInputStream(file);

int b = 0;

while ((b = fis.read()) != -1)

{

System.out.print((char)b);

}

fis.close();

}

catch (FileNotFoundException e)

{

e.printStackTrace();

}

catch (IOException e)

{

e.printStackTrace();

}

}

private static void BufferedReaderReadFile(String filepath)

{

try

{

StringBuffer sb = new StringBuffer();

BufferedReader br = new BufferedReader(new FileReader(new File(filepath)));

String readLine = "";

while ((readLine = br.readLine()) != null)

{

sb.append(readLine + "\n");

}

br.close();

System.out.print(sb.toString());

}

catch (FileNotFoundException e)

{

e.printStackTrace();

}

catch (IOException e)

{

e.printStackTrace();

}

}

private static void FileInputStreamReadFile(String filepath)

{

try

{

File file = new File(filepath);

FileInputStream fis = new FileInputStream(file);

long filelength = file.length();

byte[] bb = new byte[(int)filelength];

fis.read(bb);

fis.close();

System.out.println(new String(bb));

}

catch (FileNotFoundException e)

{

e.printStackTrace();

}

catch (IOException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

不知道你的文件格式,不过你可以可以尝试用io流来读取。下面代码 我试过是可以读取挺多格式文件的,你试下。

求Java的数据库视图相关操作代码

创建视图 CREATE VIEW VIEW_name    AS   SELECT empno, ename, sal, deptno FROM emp WHERE deptno = 10;

删除视图 drop VIEW VIEW_name

查询视图 SELECT id, name, salary FROM VIEW_name;


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