자바 학생 정보 관리 시스템 디자인
이 예 의 학생 정 보 는 데이터베이스 에 들 어 가 는 사 무 를 추가 합 니 다(사 무 를 제출 할 수 있 고,사 무 를 스크롤 백 할 수 있 으 며,로 컬 스 레 드 로 보완 할 수 있 습 니 다)
홈 페이지 index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<title> </title>
</head>
<body>
<a href='<c:url value="/query"/>?cmd=query'> </a>
<br><br>
<!--
<a href="<c:url value='/StudServlet?cmd=save' />"> </a>
-->
<h2> </h2>
<form action='<c:url value="/query"/>?cmd=add' method="post">
:<input type="text" name="name"/><br><br>
<fieldset style="border: solid;border-color: red;width: 250px;">
<legend> 1</legend>
:<input type="text" name="book"/><br><br>
:<input type="text" name="price"/>
</fieldset>
<br>
<fieldset style="border: solid;border-color:green;width: 250px;">
<legend> 2</legend>
:<input type="text" name="book"/><br><br>
:<input type="text" name="price"/>
</fieldset>
<br><br>
<input type="submit" value=" "/><br><br>
</form>
</body>
</html>
package cn.hncu.utils;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.sql.Connection;
import java.sql.DriverManager;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
public class ConnUtils5 {
// ， :
private static ThreadLocal< Connection> t=new ThreadLocal<Connection>();
private final static List<Connection> pool=new ArrayList<Connection>();
private static int SIZE;//
private ConnUtils5(){
}
static{
Properties p=new Properties();
try {
// Java classpath ， JavaEE 。 Tomcat
//p.load( ClassLoader.getSystemClassLoader().getSystemResourceAsStream("jdbc.properties"));
// p.load(ClassLoader.getSystemResourceAsStream("jdbc.properties"));
// Web classpath ,
p.load(ConnUtils3.class.getClassLoader().getResourceAsStream("jdbc.properties"));
String driver=p.getProperty("driver");
String url=p.getProperty("url");
String name=p.getProperty("username");
String pwd=p.getProperty("password");
String ssize=p.getProperty("size");
SIZE=Integer.parseInt(ssize);
Class.forName(driver);
for(int i=0;i<SIZE;i++){
final Connection con=DriverManager.getConnection(url,name,pwd);
System.out.println("con=="+con);
// conn.close()
// conn ， close()
Object nCon=Proxy.newProxyInstance(
ConnUtils3.class.getClassLoader(),
// conn.getClass().getInterfaces(),
// , ( )
new Class[]{Connection.class},
new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
if(method.getName().equals("close")){
System.out.println(" ："+(Connection)proxy);
pool.add((Connection)proxy);
return null;
}
return method.invoke(con, args);
}
});
pool.add((Connection)nCon);
}
} catch (Exception e) {
e.printStackTrace();
}
}
public static synchronized Connection getConnection(){
// t ， ， t
Connection con=t.get();
if(con==null){
if(pool.size()<=0){
System.out.println(" ...");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
return getConnection();
}
con=pool.remove(0);
t.set(con);// t
}
return con;//
}
}
##MySQL
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://127.0.0.1:3306/hncu?useUnicode=true&characterEncoding=utf-8
username=root
password=1234
size=3
##Oracle
#driver=oracle.jdbc.driver.OracleDriver
#url=jdbc:oracle:thin:@127.0.0.1:1521:orcl
#username=scott
#password=tiger
Stud.java
package cn.hncu.domain;
import java.util.ArrayList;
import java.util.List;
/*
* “ ”
*/
public class Stud {
private String id;
private String name;
//※ “ ” --- “ ”
private List<Book> books=new ArrayList<Book>();// ， new 。
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<Book> getBooks() {
return books;
}
public void setBooks(List<Book> books) {
this.books = books;
}
@Override
public String toString() {
return "id=" + id + "," + name + "," + books;
}
}
package cn.hncu.domain;
/*
* “ ”
*/
public class Book {
private Integer id;
// ， --- ( )
private String name;
private Double price;
//※ “ ” ( ， studid)--- “ ”
private Stud s;//
//private String studid;//★★
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Double getPrice() {
return price;
}
public void setPrice(Double price) {
this.price = price;
}
public Stud getS() {
return s;
}
public void setS(Stud s) {
this.s = s;
}
/*
* toString() ， ， ， ！
*/
@Override
public String toString() {
return "id=" + id + "," + name + "," + price;// Stud ，
}
}
package cn.hncu.stud.servlet;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.hncu.domain.Book;
import cn.hncu.domain.Stud;
import cn.hncu.stud.service.IStudService;
import cn.hncu.stud.service.StudServiceImpl;
public class QueryServlet extends HttpServlet {
//
IStudService service=new StudServiceImpl();
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String cmd=request.getParameter("cmd");
System.out.println("cmd:"+cmd);
if("query".equals(cmd)){
query(request, response);
}else if("add".equals(cmd)){
add(request, response);
}
}
public void query(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
List<Map<String, String>> studs=service.query();
request.setAttribute("studs", studs);
request.getRequestDispatcher("/jsps/show.jsp").forward(request, response);
}
public void add(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//1 2 (id dao )
String name[]=request.getParameterValues("name");
System.out.println(name[0]);
Stud s=new Stud();
s.setName(name[0]);
//
String books[]=request.getParameterValues("book");
// --- ，
if(books==null||books.length<=0){
return;
}
String prices[]=request.getParameterValues("price");
for(int i=0;i<books.length;i++){
Book b=new Book();
b.setName(books[i]);
b.setPrice(Double.parseDouble(prices[i]));
//※ “ ”
s.getBooks().add(b);//
b.setS(s);//
}
//3 service
try {
service.save(s);
} catch (Exception e) {
//
}
}
}
인터페이스:
package cn.hncu.stud.service;
import java.util.List;
import java.util.Map;
import cn.hncu.domain.Stud;
public interface IStudService {
public List<Map<String, String>> query();
public void save(Stud stud);
}
package cn.hncu.stud.service;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import cn.hncu.domain.Stud;
import cn.hncu.stud.dao.BookDAO;
import cn.hncu.stud.dao.BookJdbcDao;
import cn.hncu.stud.dao.StudDAO;
import cn.hncu.stud.dao.StudJdbcDAO;
import cn.hncu.utils.ConnUtils3;
/* dao , dao，
* ， ， ！
*
* :
* 1、 dao， sql ，
* 2、 service dao， 。
*/
public class StudServiceImpl implements IStudService {
//
StudDAO dao_stud=new StudJdbcDAO();
BookDAO dao_book=new BookJdbcDao();
@Override
public List<Map<String, String>> query() {
return dao_stud.query();
}
@Override
public void save(Stud stud) {
Connection con=null;
try {
con=ConnUtils3.getConnection();
System.out.println(" ："+con);
con.setAutoCommit(false);
dao_stud.save(stud);
dao_book.save(stud.getBooks());
System.out.println(" ...");
con.commit();
} catch (Exception e) {
try {
System.out.println(" ...");
con.rollback();
} catch (SQLException e1) {
e1.printStackTrace();
}
}finally{
try {
con.setAutoCommit(true);
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
스 터 드 인터페이스
package cn.hncu.stud.dao;
import java.util.List;
import java.util.Map;
import cn.hncu.domain.Stud;
public interface StudDAO {
public List<Map<String, String>> query();
public void save(Stud stud) throws Exception;
}
package cn.hncu.stud.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import cn.hncu.domain.Book;
import cn.hncu.domain.Stud;
import cn.hncu.utils.ConnUtils3;
public class StudJdbcDAO implements StudDAO {
@Override
public List<Map<String, String>> query() {
List<Map<String, String>> list=new ArrayList<Map<String,String>>();
// map ， List<Map>
Connection con=null;
try {
con=ConnUtils3.getConnection();
Statement st=con.createStatement();
String sql="select * from stud";
ResultSet rs=st.executeQuery(sql);
while(rs.next()){
Map<String,String> m=new HashMap<String, String>();
m.put("id", (String) rs.getObject(1));
m.put("name", (String) rs.getObject(2));
list.add(m);
}
rs.close();
st.close();
} catch (SQLException e) {
e.printStackTrace();
}finally{
try {
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return list;
}
@Override
public void save(Stud stud) throws Exception {
Connection con=ConnUtils3.getConnection();
System.out.println(" ："+con);
String sql="insert into stud values(?,?)";
String uuid=UUID.randomUUID().toString().replace("-", "");
PreparedStatement pst=con.prepareStatement(sql);
stud.setId(uuid);// " " book " " id，
pst.setString(1, uuid);
pst.setString(2, stud.getName());
System.out.println("1:"+uuid+",2:"+stud.getName());
pst.executeUpdate();
// con.close();// con,
}
}
package cn.hncu.stud.dao;
import java.util.List;
import cn.hncu.domain.Book;
public interface BookDAO {
public void save(List<Book> books) throws Exception;
}
package cn.hncu.stud.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.util.List;
import cn.hncu.domain.Book;
import cn.hncu.utils.ConnUtils3;
public class BookJdbcDao implements BookDAO {
@Override
public void save(List<Book> books) throws Exception {
Connection con=ConnUtils3.getConnection();
System.out.println(" ："+con);
String sql="insert into book(name,price,studid) values(?,?,?)";
PreparedStatement pst=con.prepareStatement(sql);
for(Book b:books){
pst.setString(1, b.getName());
pst.setDouble(2, b.getPrice());
pst.setObject(3, "12132312");// ( ， )--
// pst.setObject(3, b.getS().getId());
System.out.println("1:"+b.getName()+",2:"+b.getPrice()+",3:"+b.getS().getId());
pst.addBatch();//
}
pst.executeBatch();//
// con.close();// con，
}
}
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<title> </title>
</head>
<body>
<h2> </h2>
<c:forEach items="${studs}" var="x">
${x.id},${x.name}<br/>
</c:forEach>
</body>
</html>
관리 시스템 에 대한 더 많은 내용 은 《관리 시스템 주 제》. 을 클릭 하여 학습 하 세 요.
이상 이 바로 본 고의 모든 내용 입 니 다.여러분 의 학습 에 도움 이 되 고 저 희 를 많이 응원 해 주 셨 으 면 좋 겠 습 니 다.
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