java创造代码,JAVA程序代码

用java编写一个创建数据库和表的程序的代码怎么写

import java.sql.*;

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public class Test

{

public static void main(String[] args) throws Exception

{

Class.forName("com.mysql.jdbc.Driver");

//一开始必须填一个已经存在的数据库

String url = "jdbc:mysql://localhost:3306/test?useUnicode=truecharacterEncoding=utf-8";    

Connection conn = DriverManager.getConnection(url, "root", "123456");

Statement stat = conn.createStatement();

//创建数据库hello

stat.executeUpdate("create database hello");

//打开创建的数据库

stat.close();

conn.close();

url = "jdbc:mysql://localhost:3306/hello?useUnicode=truecharacterEncoding=utf-8";

conn = DriverManager.getConnection(url, "root", "123456");

stat = conn.createStatement();

//创建表test

stat.executeUpdate("create table test(id int, name varchar(80))");

//添加数据

stat.executeUpdate("insert into test values(1, '张三')");

stat.executeUpdate("insert into test values(2, '李四')");

//查询数据

ResultSet result = stat.executeQuery("select * from test");

while (result.next())

{

System.out.println(result.getInt("id") + " " + result.getString("name"));

}

//关闭数据库

result.close();

stat.close();

conn.close();

}

}

根据要求编写java代码，急求，答案正确加100分！求高手！

服务器端：

package com.lqq.service;

import java.io.File;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.net.Socket;

import java.util.List;

import com.lqq.vo.QueryType;

import com.lqq.vo.Student;

public class DealClientRequest implements Runnable

{

private Socket s = null;

private ParserXML p = new ParserXML(new File("students.xml"));

public DealClientRequest(Socket s)

{

this.s = s;

}

@Override

public void run()

{

if(s != null)

{

try

{

ObjectInputStream ois = new ObjectInputStream(s.getInputStream());

ObjectOutputStream oos = new ObjectOutputStream(s.getOutputStream());

QueryType qt = (QueryType) ois.readObject();

if(qt.getQueryType() == 1)//单查

{

System.out.println("执行单查，查询的名字= " + qt.getQueryName());

Student stu = p.getStudent(qt.getQueryName());

oos.writeObject(stu);

}else if(qt.getQueryType() == 2)//全查

{

System.out.println("执行全查");

ListStudent list = p.getAllStudent();

for(int i = 0; i list.size(); i++)

{

Student stu = list.get(i);

oos.writeObject(stu);

}

}

} catch (IOException e)

{

e.printStackTrace();

} catch (ClassNotFoundException e)

{

e.printStackTrace();

}

}

}

}

*************************

package com.lqq.service;

import java.io.IOException;

import java.net.ServerSocket;

import java.net.Socket;

public class MainService

{

private ServerSocket ss;

public void startService() throws IOException

{

ss = new ServerSocket(10086);

while(true)

{

System.out.println("服务器在10086等待...");

Socket s = ss.accept();

new Thread(new DealClientRequest(s)).start();

System.out.println("启动处理线程成功");

}

}

}

******************

package com.lqq.service;

import java.io.File;

import java.util.ArrayList;

import java.util.List;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.NodeList;

import org.w3c.dom.Text;

import com.lqq.vo.Student;

public class ParserXML

{

private DocumentBuilderFactory bdf;

private DocumentBuilder db;

private Document dom;

public ParserXML(File file)

{

bdf = DocumentBuilderFactory.newInstance();

try

{

db = bdf.newDocumentBuilder();

dom = db.parse(file);

} catch (Exception e)

{

e.printStackTrace();

}

}

public ListStudent getAllStudent()

{

ListStudent stu = new ArrayListStudent();

Element root = dom.getDocumentElement();

NodeList list = root.getElementsByTagName("stu");

for(int i = 0; i list.getLength(); i++)

{

Element e = (Element) list.item(i);

Student st = new Student();

NodeList names = e.getElementsByTagName("name");

if(names.getLength() == 1)

{

Element name = (Element)names.item(0);

Text text = (Text) name.getFirstChild();

st.setStuName(text.getNodeValue());

}

NodeList sexs = e.getElementsByTagName("sex");

if(sexs.getLength() == 1)

{

Element name = (Element)sexs.item(0);

Text text = (Text) name.getFirstChild();

st.setStuGender(text.getNodeValue());

}

NodeList ages = e.getElementsByTagName("age");

if(ages.getLength() == 1)

{

Element name = (Element)ages.item(0);

Text text = (Text) name.getFirstChild();

st.setStuAge(Integer.parseInt(text.getNodeValue()));

}

NodeList classs = e.getElementsByTagName("class");

if(classs.getLength() == 1)

{

Element name = (Element)classs.item(0);

Text text = (Text) name.getFirstChild();

st.setStuClassName(text.getNodeValue());

}

stu.add(st);

}

return stu;

}

public Student getStudent(String stuName)

{

ListStudent list = this.getAllStudent();

for(int i = 0; i list.size(); i++)

{

Student st = list.get(i);

if(st.getStuName().equals(stuName))

return st;

}

return null;

}

}

*************

package com.lqq.service;

import java.io.IOException;

public class Service

{

public static void main(String[] args)

{

MainService ms = new MainService();

try

{

ms.startService();

} catch (IOException e)

{

e.printStackTrace();

}

}

}

*******

package com.lqq.vo;

import java.io.Serializable;

public class QueryType implements Serializable

{

private static final long serialVersionUID = 8713870836629046060L;

/**

* 1 单查

* 2 全查

*/

private byte queryType;

private String queryName;

public byte getQueryType()

{

return queryType;

}

public void setQueryType(byte queryType)

{

this.queryType = queryType;

}

public String getQueryName()

{

return queryName;

}

public void setQueryName(String string)

{

this.queryName = string;

}

}

************

package com.lqq.vo;

import java.io.Serializable;

public class Student implements Serializable

{

private static final long serialVersionUID = -6087251613589160139L;

private String stuName;

private int stuAge;

private String stuGender;

private String stuClassName;

@Override

public String toString()

{

return "姓名: " + stuName + "\t性别: " + stuGender

+ "\t年龄: " + stuAge + "\t班级: " + stuClassName;

}

public String getStuName()

{

return stuName;

}

public void setStuName(String stuName)

{

this.stuName = stuName;

}

public int getStuAge()

{

return stuAge;

}

public void setStuAge(int stuAge)

{

this.stuAge = stuAge;

}

public String getStuGender()

{

return stuGender;

}

public void setStuGender(String stuGender)

{

this.stuGender = stuGender;

}

public String getStuClassName()

{

return stuClassName;

}

public void setStuClassName(String stuClassName)

{

this.stuClassName = stuClassName;

}

}

*************

?xml version="1.0" encoding="UTF-8"?

stus

stu

name令狐冲/name

age12/age

class华山派/class

sex男/sex

/stu

stu

name东方不败/name

age22/age

class日月神教/class

sex女/sex

/stu

stu

name岳不群/name

age23/age

class华山派/class

sex妖/sex

/stu

stu

name风清扬/name

age88/age

class华山派/class

sex男/sex

/stu

/stus

客户端：

package com.lqq.c;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.net.Socket;

import java.net.UnknownHostException;

import com.lqq.vo.QueryType;

import com.lqq.vo.Student;

public class AllQuery implements Runnable

{

private Socket s;

public AllQuery(QueryType qt)

{

try

{

s = new Socket("localhost", 10086);

ObjectOutputStream oos = new ObjectOutputStream(s.getOutputStream());

oos.writeObject(qt);

} catch (UnknownHostException e)

{

e.printStackTrace();

} catch (IOException e)

{

e.printStackTrace();

}

}

@Override

public void run()

{

if(s != null)

{

try

{

ObjectInputStream ois = new ObjectInputStream(s.getInputStream());

Student stu = (Student) ois.readObject();

Client c = new Client();

while(stu != null)

{

c.showStudentInfo(stu);

stu = (Student) ois.readObject();

}

} catch (IOException e)

{

e.printStackTrace();

} catch (ClassNotFoundException e)

{

e.printStackTrace();

}

}

}

}

**************

package com.lqq.c;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.net.Socket;

import java.util.Scanner;

import com.lqq.vo.QueryType;

import com.lqq.vo.Student;

public class Client

{

public void showStudentInfo(Student stu)

{

if(stu != null)

{

System.out.println(stu);

}

}

public void showMenu()

{

System.out.println("\t\t菜  单");

System.out.println("\t1.单 查");

System.out.println("\t2.全 查");

System.out.println("\t0.退 出");

}

public String getUserInput()

{

Scanner scan = new Scanner(System.in);

System.out.println("请输入:");

return scan.next();

}

public void requestQuery(String userSelect)

{

if(userSelect != null)

{

if("1".equals(userSelect.trim()))

{

QueryType qt = new QueryType();

qt.setQueryType((byte)1);

Scanner san = new Scanner(System.in);

System.out.println("请输入查询的学生名字:");

String queryStuName = san.next();

qt.setQueryName(queryStuName);

this.executeQeury(qt);

}else if("2".equals(userSelect.trim()))

{

QueryType qt = new QueryType();

qt.setQueryType((byte)2);

this.executeQeury(qt);

}else if("0".equals(userSelect.trim()))

{

System.exit(0);

}

else

{

System.out.println("输入有误");

}

}

}

public void executeQeury(QueryType qt)

{

try

{

Socket s = new Socket("localhost", 10086);

ObjectOutputStream oos = new ObjectOutputStream(s.getOutputStream());

oos.writeObject(qt);

System.out.println("请求发送完毕");

ObjectInputStream ois = new ObjectInputStream(s.getInputStream());

if(qt.getQueryType() == 1)

{

Student stu = (Student) ois.readObject();

showStudentInfo(stu);

}else if(qt.getQueryType() == 2)

{

new Thread(new AllQuery(qt)).start();

}

} catch (IOException e)

{

e.printStackTrace();

} catch (ClassNotFoundException e)

{

e.printStackTrace();

}

}

public static void main(String[] args)

{

Client client = new Client();

while(true)

{

client.showMenu();

client.requestQuery(client.getUserInput());

}

}

}

**********

package com.lqq.vo;

import java.io.Serializable;

public class QueryType implements Serializable

{

private static final long serialVersionUID = 8713870836629046060L;

/**

* 1 单查

* 2 全查

*/

private byte queryType;

private String queryName;

public byte getQueryType()

{

return queryType;

}

public void setQueryType(byte queryType)

{

this.queryType = queryType;

}

public String getQueryName()

{

return queryName;

}

public void setQueryName(String string)

{

this.queryName = string;

}

}

**********

package com.lqq.vo;

import java.io.Serializable;

public class Student implements Serializable

{

private static final long serialVersionUID = -6087251613589160139L;

private String stuName;

private int stuAge;

private String stuGender;

private String stuClassName;

@Override

public String toString()

{

return "姓名: " + stuName + "\t性别: " + stuGender

+ "\t年龄: " + stuAge + "\t班级: " + stuClassName;

}

public String getStuName()

{

return stuName;

}

public void setStuName(String stuName)

{

this.stuName = stuName;

}

public int getStuAge()

{

return stuAge;

}

public void setStuAge(int stuAge)

{

this.stuAge = stuAge;

}

public String getStuGender()

{

return stuGender;

}

public void setStuGender(String stuGender)

{

this.stuGender = stuGender;

}

public String getStuClassName()

{

return stuClassName;

}

public void setStuClassName(String stuClassName)

{

this.stuClassName = stuClassName;

}

}

时间太紧，没有完善代码，基本功能实现了，代码没有优化，你自己再改改，希望可以帮到你

使用java实现创建本地文件的代码

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

public class CreateFile {

public static void main(String[] args) {

String str = "需要写入的字";

String fileName = "D:\\a\\a.xml";

OutputStream output = null;// 输出字节流

OutputStreamWriter outputWrite = null;// 输出字符流

PrintWriter print = null;// 输出缓冲区

try {

output = new FileOutputStream(fileName);

outputWrite = new OutputStreamWriter(output);

print = new PrintWriter(outputWrite);

print.print(str);

print.flush();// 一定不要忘记此句，否则数据有可能不能被写入文件

output.close();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

}

再一个问题就是只要你编码正确就可以正常打开。

Java编写代码,在D盘下创建abc文件夹,然后在abc文件夹中创建abc文件,求详细代码？！

Java代码：

import java.io.File;

import java.io.IOException;

public class Test10 {

public static void main(String[] args) {

//创建“abc”文件夹

String pathName = "d:\\abc";

File path = new File(pathName);

path.mkdir();

//创建“abc”文件

String fileName = "d:\\abc\\abc";

File file = new File(fileName);

try {

file.createNewFile();

}

catch (IOException e) {

e.printStackTrace();

}

}

}

Java动态生成代码

可以的，我说说大概思路，很简单，你自己具体实现吧，把代码写给你没意义的：

1.将你这段字符串输出到一个文件里，用Java类文件的方式命名。

2.调用外部javac命令将该文件编译。

3.用类加载器（ClassLoad）动态加载新的class文件并用Class.forName()注册该类，然后就可以正常使用了。

上面的每一步都能在baidu中找到实现方法，自己发挥吧。

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