dom4j读取xml文档，通过JDBC写入数据库

　　最近一段时间，每天上班都把时间用在看文档上，动手写代码的比重大大减少。今天无意中看到公司的一个面试题，顺手拿过来做了一下，简单的几个类没想到竟然用了将近一下午的时间，其间还得不断地依靠google，最后的插入sql甚至只写了关键词insert 漏掉了into。常时间不写，手生的可怕。以后要随时看随时记随时写。

　　记一下基本的知识点。

　　

读取文档monthTotalData.xml

<?xml version="1.0" encoding="UTF-8"?>
<data>
    <monthTotalData>
        <year>1996</year>
        <month>1</month>
        <total>200</total>
        <employeeId>2</employeeId>
    </monthTotalData>

    <monthTotalData>
        <year>1996</year>
        <month>2</month>
        <total>300</total>
        <employeeId>2</employeeId>
    </monthTotalData>

    <monthTotalData>
        <year>1996</year>
        <month>5</month>
        <total>500</total>
        <employeeId>3</employeeId>
    </monthTotalData>

    <monthTotalData>
        <year>1997</year>
        <month>8</month>
        <total>500</total>
        <employeeId>3</employeeId>
    </monthTotalData>

    <monthTotalData>
        <year>1997</year>
        <month>9</month>
        <total>600</total>
        <employeeId>2</employeeId>
    </monthTotalData>

    <monthTotalData>
        <year>1997</year>
        <month>10</month>
        <total>600</total>
        <employeeId>2</employeeId>
    </monthTotalData>

    <monthTotalData>
        <year>2009</year>
        <month>3</month>
        <total>600</total>
        <employeeId>1</employeeId>
    </monthTotalData>

    <monthTotalData>
        <year>2010</year>
        <month>5</month>
        <total>700</total>
        <employeeId>1</employeeId>
    </monthTotalData>

    <monthTotalData>
        <year>2009</year>
        <month>9</month>
        <total>500</total>
        <employeeId>2</employeeId>
    </monthTotalData>
</data>

实体类MonthTotal.java

package domain;

public class MonthTotal {

    private int id;
    private int year;
    private int month;
    private int total;
    private int employee_id;
    
    public MonthTotal(){}
    
    public MonthTotal(int year, int month, int total, int employeeId) {
        super();
        this.year = year;
        this.month = month;
        this.total = total;
        employee_id = employeeId;
    }

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public int getYear() {
        return year;
    }
    public void setYear(int year) {
        this.year = year;
    }
    public int getMonth() {
        return month;
    }
    public void setMonth(int month) {
        this.month = month;
    }
    public int getTotal() {
        return total;
    }
    public void setTotal(int total) {
        this.total = total;
    }
    public int getEmployee_id() {
        return employee_id;
    }
    public void setEmployee_id(int employeeId) {
        employee_id = employeeId;
    }
    @Override
    public String toString() {
        return "Month_total [employee_id=" + employee_id + ", id=" + id
                + ", month=" + month + ", total=" + total + ", year=" + year
                + "]";
    }
     
}

插入方法类InsertDB.java

package insertDB;

import java.io.File;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.util.ArrayList;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import domain.MonthTotal;

public class InsertDB {

    public void insert(MonthTotal month) {
        try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection conn = DriverManager.getConnection(
                    "jdbc:mysql://localhost:3306/test", "root", "root");

            String sql = "insert into month_total (year, month, employee_id, total) values ("
                    + month.getYear()
                    + ","
                    + month.getMonth()
                    + ", "
                    + month.getEmployee_id() + ", " + month.getTotal() + ");  ";

            System.out.println(sql);
            PreparedStatement psmt = conn.prepareStatement(sql);
            psmt.execute();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        InsertDB i = new InsertDB();
        List<MonthTotal> list = i.getElementsList();
        for(MonthTotal m : list){
            i.insert(m);
        }
    }

    @SuppressWarnings("unchecked")
    public List<MonthTotal> getElementsList() {
        String filePath = "src/monthTotalData.xml";
        File f = new File(filePath);
        SAXReader reader = new SAXReader();
        List<MonthTotal> monthList = new ArrayList<MonthTotal>();
        try {
            Document docment = reader.read(f);
            Element root = docment.getRootElement();

            List<Element> months = new ArrayList<Element>();

            months = root.elements();
            for (Element e : months) {
                int year = Integer.parseInt(e.elementText("year"));
                int month = Integer.parseInt(e.elementText("month"));
                int employeeId = Integer.parseInt(e.elementText("employeeId"));
                int total = Integer.parseInt(e.elementText("total"));
                MonthTotal m = new MonthTotal(year, month, total, employeeId);

                monthList.add(m);
            }

        } catch (DocumentException e) {
            e.printStackTrace();
        }
        return monthList;
    }
}