Java从Txt文本进行数据提取

思路：

按行读取数据，将有用的行提取出来，然后从行里提取有用得数据保存在数组中。

readLine()方法是由BufferedReader类提供的阻塞式方法，当没有数据读取时，就一直会阻塞在那，而不是返回null；
如果不指定buffer大小，则readLine()使用的buffer有8192个字符。在达到buffer大小之前，只有遇到”/r”、”/n”、”/r/n”才会返回

package readText;

import java.util.List;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.LinkedList;
public class Compare {
    private String date;
    private String missionid;
    private String com;
    private String rfid1;
    private String rfid2;
       
    List<Compare> a=new LinkedList<Compare>();
    public Compare(String date,String missionid,String com,String rfid1,String rfid2){
        this.date=date;
        this.missionid=missionid;
        this.com=com;
        this.rfid1=rfid1;
        this.rfid2=rfid2;        
    }
    
    public Compare(){}
    public void setGh(String date){
        this.date=date;
    }
    public String getDate(){
        return this.date;
    }
    public void setShift(String missionid){
        this.missionid=missionid;
    }
    public String getMissionid(){
        return this.missionid;
    }
    public void setCom(String com){
        this.com=com;
    }
    public String getCom(){
        return this.com;
    }
    public void setRfid1(String rfid1){
        this.rfid1=rfid1;
    }
    public String getRfid1(){
        return this.rfid1;
    }
    public void setRfid2(String rfid2){
        this.rfid2=rfid2;
    }
    public String getRfid2(){
        return this.rfid2;
    }
}

package readText;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

import java.util.ArrayList;

import java.util.List;
import java.util.LinkedList;
import readText.Compare;

public class ReadData {
     public static void main(String[] args) throws IOException {
            try{
                String dir="Log_2020-12-06_000";
                BufferedReader in = new BufferedReader(new FileReader("C:\机器人Log\05\"+dir+".txt"));//打开文件创建数据流
                BufferedWriter out = new BufferedWriter(new FileWriter("C:\机器人Log\05\"+dir+"_out.txt"));
                BufferedWriter out_rfid = new BufferedWriter(new FileWriter("C:\机器人Log\05\"+dir+"_out_RFID.txt"));
                String str; //定义String变量用来保存每一次读到的每一行的数据
                int i=0;//行数
                int j=0;//RFID个数
                int temp=0;
                
                String Date="";
                String Missionid="";
                String com="";
                String rfid1="";
                String rfid2="";
                
                ArrayList<String> arraylist =new ArrayList<String>();
                List<Compare> ls=new LinkedList<Compare>();
                /*对下面的数据进行筛选*/
                while((str=in.readLine())!=null){
                    if(str.contains("MissionID")&&str.contains("Command")&&str.contains("RFID")){//筛选条件
                        if(str.length()>0){
                           arraylist.add(str);                                                     
                           if(str.contains("PSwapD")){
                               j=j+2;
                               Date=str.substring(0, 19);
                               Missionid=str.substring(43, 58);
                               com="PSwapD";
                               rfid1=str.substring(112, 120);
                               rfid2=str.substring(145, 154);
                               //System.out.println(Date+Missionid+com+rfid1+rfid2);
                               
                               Compare compare=new Compare(Date,Missionid,com,rfid1,rfid2);
                               //System.out.println(compare.getDate());
                               ls.add(compare);                                                             
                           }else{
                               temp=temp+1;
                               j=j+1;                               
                               if(str.contains("PD")){                                   
                                   Date=str.substring(0, 19);
                                   Missionid=str.substring(43, 58);
                                   com="PD";
                                   rfid1=str.substring(120, 128);
                                   rfid2="";
                                   //System.out.println(Date+Missionid+com+rfid1+rfid2);                                   
                                   Compare compare=new Compare(Date,Missionid,com,rfid1,rfid2);
                                   //System.out.println(compare.getDate());
                                   ls.add(compare);                                                                      
                               }
                               if(str.contains("Pickup")){                                   
                                   Date=str.substring(0, 19);
                                   Missionid=str.substring(43, 58);
                                   com="Pickup";
                                   rfid1=str.substring(113, 122);
                                   rfid2="";
                                   //System.out.println(Date+Missionid+com+rfid1+rfid2);
                                   
                                   Compare compare=new Compare(Date,Missionid,com,rfid1,rfid2);
                                   //System.out.println(compare.getDate());
                                   ls.add(compare);
                                   
                               }if(str.contains("Dropoff")){                                   
                                   Date=str.substring(0, 19);
                                   Missionid=str.substring(43, 58);
                                   com="Dropoff";
                                   rfid1=str.substring(112, 120);
                                   rfid2="";
                                   //System.out.println(Date+Missionid+com+rfid1+rfid2);
                                   
                                   Compare compare=new Compare(Date,Missionid,com,rfid1,rfid2);
                                   //System.out.println(compare.getDate());
                                   ls.add(compare);
                                   
                               }
                           }
                           
                           i=i+1; 
                        }
                    }
                }
                in.close();
                for (String s: arraylist){
                    out.write(s);
                    out.newLine();
                    out.flush();
                    
                }
                System.out.println(ls.size());
                for(int z=0;z<ls.size();z++){
                    String rfid=ls.get(z).getDate()+" "+ls.get(z).getMissionid()+" "+ls.get(z).getCom()+" "+ls.get(z).getRfid1()+" "+ls.get(z).getRfid2();
                    System.out.println(rfid);
                    
                    out_rfid.write(rfid);
                    out_rfid.newLine();
                    out_rfid.flush();
               }
                out.write("输出完毕，共"+i+"行,"+j+"RFID");
                out.close();
                out_rfid.close();
                System.out.println("输出完毕，共"+i+"行");
                System.out.println("输出完毕，共"+j+"个RFID");
                System.out.println("输出完毕，共"+temp+"个RFID");
                } catch (IOException e) { 
            } 
        }

}