javaweb experiment three XML application program development

Project path: F:\Javaproject

If it is different, please pay attention to modify the path-related fragments in the code

1. Take out all the data in the dept table in the database and generate a dept.xml data. (30 points)

Dept data table format:

Dept table content:

Import: jar package (create a lib folder and put it into the jar package, right-click to build the path)

The result display:

code:

DatabaseConnection.java (connect to the database; 1 , 2 common):

package demo3_1and2;
import java.sql.Connection ;
import java.sql.DriverManager;
import java.sql.SQLException;
 
public class DatabaseConnection {
	private static final String DBDRIVER = "com.mysql.jdbc.Driver" ;
	private Connection conn = null ;
	
	public DatabaseConnection() {
		try {
			Class.forName(DBDRIVER) ;
		} catch(ClassNotFoundException e) {
			e.printStackTrace() ;
		}
		try{
			conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/sys?characterEncoding=UTF8&autoReconnect=true&useSSL=true","root","2020189011");
		} catch(SQLException e) {
			e.printStackTrace();
		}
	}
	
	public Connection getConnection() {
		return this.conn ;
	}
	
	public void close() {
		if(this.conn != null) {
			try {
				this.conn.close();
			} catch(SQLException e) {
				e.printStackTrace();
			}
		}
	}
}
 

Dept_to_xml.java:

package demo3_1and2;
import java.io.*;
import java.sql.* ;
import org.dom4j.DocumentHelper;
import org.dom4j.io.*;
import org.dom4j.*;
public class Dept_to_xml {
	private Connection conn ;
	private PreparedStatement pstmt ;
	private ResultSet rs ;
	
	public static void main(String[] args) throws SQLException {
		new Dept_to_xml() ;
	}
	public Dept_to_xml() throws SQLException {
		DatabaseConnection dbc = new DatabaseConnection() ;
		//打开数据库
		conn = dbc.getConnection();
		String sql = "select * from dept " ;
		Document doc = DocumentHelper.createDocument();
		try {
			pstmt = conn.prepareStatement(sql) ;
			rs = pstmt.executeQuery();
			Element dept = doc.addElement("dept") ;
			while(rs.next()) {
				Element deptno = dept.addElement("deptno") ;
				Element dname = dept.addElement("dname") ;
				Element loc = dept.addElement("loc") ;
				deptno.setText(rs.getString(1)) ;
				dname.setText(rs.getString(2));
				loc.setText(rs.getString(3));
			}
			OutputFormat format = OutputFormat.createPrettyPrint();
			format.setEncoding("GBK");
			XMLWriter writer = null ;
			try {
				writer = new XMLWriter(new FileOutputStream("F:\\Javaproject\\demo3(1、2)\\src\\demo3_1and2" + File.separator + "dept_to_xml.xml"),format) ;
				writer.write(doc);
				writer.close();
			} catch(IOException e) {
				e.printStackTrace();
			}
			
			System.out.println("成功，xml已保存到dept_to_xml");
			
		} catch(SQLException e) {
			e.printStackTrace();
		}
		//关闭数据库
		pstmt.close();
		rs.close();
		dbc.close();
		
	}
}

2. Given the following XML file, it is required that all relevant data can be inserted into the database table through the parsing operation. (30 points)

emp data table format:

emp01.xml：

<?xml version="1.0" encoding="UTF-8"?>
<emps>
    <emp>
        <empno>1000</empno>
        <ename>张三</ename>
        <job>经理</job>
        <hiredate>1998-08-16</hiredate>
        <sal>3000</sal>
        <comm>500</comm>
    </emp>
</emps>

The result display:

code:

Xml_to_emp.java:

package demo3_1and2;

import java.io.File;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Iterator;
 
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
 
public class Xml_to_emp {
	private Connection conn ;
	private Statement stmt ;
	public static void main(String[] args) throws SQLException {		
		new Xml_to_emp();
	}
	
	
		
	public Xml_to_emp() throws SQLException{
		File file = new File("F:\\Javaproject\\demo3(1、2)\\src\\demo3_1and2" + File.separator + "emp01.xml");	//读取文件
		SAXReader reader = new SAXReader();	//建立SAX解析读取
		Document doc = null;
		try {
			doc = reader.read(file);	//读取文档
		} catch(DocumentException e) {
			e.printStackTrace();
		}
		
		String emno = "";
		String emname = "";
		String emjob = "";
		String emhiredate = "";
		String emsal = "";
		String emcomm = "";
		
		Element root = doc.getRootElement();	//取得根元素
		Iterator<Element> iter = root.elementIterator();	//取得全部的子节点
		while(iter.hasNext()) {
			Element linkman = iter.next();	//取得每一个linkman
						
			emno = linkman.elementText("empno");
			emname = linkman.elementText("ename");
			emjob = linkman.elementText("job");
			emhiredate = linkman.elementText("hiredate");
			emsal = linkman.elementText("sal");
			emcomm = linkman.elementText("comm");					
		}
		DatabaseConnection dbc = new DatabaseConnection() ;
		conn = dbc.getConnection();
		try {
			stmt = conn.createStatement();
		} catch (SQLException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
		String sql = "INSERT INTO emp(empno,ename,job,hiredate,sal,comm)" + "VALUES('"+ emno +"','"+ emname +"','"+ emjob + "','"+ emhiredate +"','"+ emsal +"','"+ emcomm +"')";	//插入数据操作，拼凑出一个完整的SQL语句
		try {
			stmt.executeUpdate(sql);
		} catch (SQLException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
		System.out.println("信息已加入数据库");
		stmt.close();
		dbc.close();
	}
	}

3. Use js to dynamically add and delete tables, click the Add button, add a piece of data in the table, click the Delete button, and delete a piece of data in the table.

Show results:

 

code:

index.jsp：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<%@ page language="java" contentType="text/html; charset=UTF-8"  pageEncoding="UTF-8"%>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>动态新增和删除</title>
<style>
    table{
        margin-top: 100px;
        border: 1px solid black;
    }
    th{
        border: 1px solid black;
        width:120px;
    }
    td{
        border: 1px solid black;
        width:120px;
    }
</style>
<script type="text/javascript">
function addTr(){
    //获取表单中的数据
    var name = document.getElementById("name").value;
    var sex = document.getElementById("sex").value;
    var age = document.getElementById("age").value;
    //创建td对象
    var td_name = document.createElement("td");
    var text_name = document.createTextNode(name);
    td_name.appendChild(text_name);

    var td_sex = document.createElement("td");
    var text_sex = document.createTextNode(sex);
    td_sex.appendChild(text_sex);

    var td_age = document.createElement("td");
    var text_age = document.createTextNode(age);
    td_age.appendChild(text_age);
    //删除按钮
    var td_a = document.createElement("td");
    var ele_a = document.createElement("input");
    ele_a.setAttribute("type","button");
    ele_a.setAttribute("onclick","delTr(this);");
    ele_a.setAttribute("value","删除");
    td_a.appendChild(ele_a);

    //创建tr元素对象
    var tr = document.createElement("tr");
    tr.appendChild(td_name);
    tr.appendChild(td_sex);
    tr.appendChild(td_age);
    tr.appendChild(td_a);

    //获取table元素对象
    var table = document.getElementsByTagName("table")[0];
    table.appendChild(tr)

}

//定义一个删除的方法
function delTr(obj){
    var table = obj.parentNode.parentNode.parentNode;
    var tr = obj.parentNode.parentNode;
    table.removeChild(tr);
}

</script>
</head>
<body>
<form  action="#" method="get" align="center" >
	<label for="name">用户名：		<!-- 标注 for=id -->
		</label>
    <input type="text" id="name" name="name" placeholder="请输入用户名">
    <br><br>
    <label for="sex">性别：    &nbsp&nbsp&nbsp	<!-- 标注 for=id -->
		</label>
    <input type="text" id="sex" name="sex" placeholder="请输入性别">
    <br><br>
    <label for="age">年龄：	 &nbsp&nbsp&nbsp	<!-- 标注 for=id -->
		</label>
    <input type="text" id="age" name="age" placeholder="请输入年龄">
    <br><br>
    <input type="button" id="add" value="添加" onclick="addTr()">
</form>

<table align="center">
    <caption>用户信息动态表</caption>
    <tr>
        <th>用户名</th>
        <th>性别</th>
        <th>年龄</th>
        <th>操作</th>
    </tr>
    <tr>
    <td>只因</td>
    <td>男</td>
    <td>20</td>
    <td><input type="button" id="del" onclick="delTr(this)" value="删除"></td>
    </tr>
</table>
</body>
</html>