建造者模式实例数据拼接 java生成真实XML文件-摩杜云开发者社区

导出数据的应用框架，通常对于具体的导出内容和格式是有要求的：
分成三部分，文件头、文件体、文件尾
文件头：分公司编号、导出数据的日期，对于文本格式，中间用逗号分离
文件体：表名称，然后分条描述数据。。。。
文件尾：输出人
不管是输出文本文件，还是输出XML文件，步骤基本一致
先拼接文件头的内容
然后拼接文件体的内容
在拼接文件尾的内容
最后把拼接好的内容输出去成为文件

建造者模式实例数据拼接 java生成真实XML文件

Builder

package 建造者模式;

public abstract class Builder {
  protected String id;
  protected String date;
  protected String TableName;
  protected String data;
  protected String Person;
   
   
  public Builder(String id, String date, String tableName, String data,String person)
  {
    this.id = id;
    this.date = date;
    TableName = tableName;
    this.data = data;
    Person = person;
  }
  public abstract void BuildHead();
  public abstract void BuildBody();
  public abstract void BuildFoot();
}

TXT

package 建造者模式;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class TXT extends Builder {
  public TXT(String id, String date, String tableName, String data,
      String person) {
    super(id, date, tableName, data, person);
  }
private String str="";
  
@Override
public void BuildHead() {
  str+=id+","+date+"\r\n";
  
}
@Override
public void BuildBody() {
  str+=TableName+"\r\n";
  str+=data+"\r\n";
  
}
@Override
public void BuildFoot() {
  str+=Person+"\r\n";
  
}
public void Result() throws IOException{
  File f1=new File("c:\\a.txt");
  FileWriter fw=new FileWriter(f1);
  BufferedWriter bw=new BufferedWriter(fw); 
      bw.write(str);
      bw.close();
 
 
}
}

XML

package 建造者模式;

import java.io.File;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.*;

public class XML extends Builder {
  private Document document;
  private Element container;
public XML(String id, String date, String tableName, String data,
      String person) throws ParserConfigurationException 
      {
    super(id, date, tableName, data, person);    
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder db = factory.newDocumentBuilder();
     document = db.newDocument();
  }
 
 
  @Override
  public void BuildHead() {
    document.setXmlStandalone(true);
    container=document.createElement("Conatiner");
    Element head=document.createElement("Head");
    
    Element Id = document.createElement("Id");
    Id.setTextContent(id);
    
    Element Date = document.createElement("Date");
    Date.setTextContent(date);
    head.appendChild(Id);
    head.appendChild(Date);
  container.appendChild(head);
    
    
  }
 
 
  @Override
  public void BuildBody() {
    
    Element Body=document.createElement("body");
    Element tname = document.createElement("TableName");
    tname.setTextContent(TableName);
    
    Element Data = document.createElement("Data");
    Data.setTextContent(data);
    Body.appendChild(Data);
    Body.appendChild(tname);
    container.appendChild(Body);
    
  }
 
 
  @Override
  public void BuildFoot() {
    
    
    Element foot=document.createElement("foot");
    Element per = document.createElement("Person");
    per.setTextContent(Person);
    foot.appendChild(per);
    container.appendChild(foot);
    document.appendChild(container);
  }
  public void Result() throws TransformerException
  {TransformerFactory tff = TransformerFactory.newInstance();
 
  Transformer tf = tff.newTransformer();
  
  tf.setOutputProperty(OutputKeys.INDENT, "yes");
  tf.transform(new DOMSource(document), new StreamResult(new File("g:/shujv.xml")));
  }
}

Director

package 建造者模式;

public class Director {

private Builder eb;
 
public Director(Builder eb) {
  
  this.eb = eb;
}
public void Build(){
  eb.BuildHead();
  eb.BuildBody();
  eb.BuildFoot();
}
}

Test

package 建造者模式;

import java.io.IOException;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerException;

public class Test {
public static void main(String args[]) throws IOException, ParserConfigurationException, TransformerException{
  TXT tb=new TXT("001","2020/4/16","数目","20","张三");
    Director dr=new Director(tb);
    dr.Build();
    tb.Result();
    XML ex=new XML("002","2020/4/17","价格","30","李四");
  dr=new Director(ex);
  dr.Build();
  ex.Result();
  }
}