在JAVA的列表中追加最后一个值的字符
Anu*_*sha 7 java filereader filewriter
鉴于此输入
0000027788|001400000000000000000001224627|G1|||G1
0000027789|001400000000000000000001224627|D1|||G1
0000027790|001400000000000000000001224627|D1|||G1
0000027790|001400000000000000000001224627|D1|||G1
0000027791|001400000000000000000001224627|G2|||G2
0000027792|001400000000000000000001224627|D2|||G2
0000027793|001400000000000000000001224627|D2|||G2
0000027794|001400000000000000000001224627|G6|||G6
我需要特别是从文件中的第3列,并找到哪个是G1组的最后一个D1,同样也是特定G2的D2.找到最后一个值后,我需要在相应的行中添加一些内容,如"LL":
我已经尝试过,但是这条线并没有平行地附加到每个D1上,而不仅仅是最后一个D1.
这是我的代码:
package com.scb.firstreport;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.StringTokenizer;
public class EDWBatchProcessor {
//static Logger log = Logger.getLogger(EDWBatchProcessor.class.getName());
public static void main(String[] args) throws JRException, NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
//log.debug("Hello this is a debug message");
File fileDir = new File("D:\\EDWFileProcessing\\simple.txt");
String line = null;
String[] split = null;
try {
// FileReader reads text files in the default encoding.
BufferedReader in = new BufferedReader(
new InputStreamReader(
new FileInputStream(fileDir), "UTF-8"));
BufferedWriter bufferedWriter = null;
while((line = in.readLine()) != null) {
//System.out.println(line);
split = line.split("\\|");
List<String> customerList = new ArrayList<String>();
if(!customerList.contains(split[1])){
customerList.add(split[1]);
bufferedWriter =
new BufferedWriter(new OutputStreamWriter(
new FileOutputStream("D:\\EDWFileProcessing\\output\\"+split[1]+".txt",true), "UTF-8"));
bufferedWriter.write(line);
bufferedWriter.newLine();
bufferedWriter.close();
}
else{
bufferedWriter.write(line);
bufferedWriter.close();
}
}
final File folder = new File("D:\\EDWFileProcessing\\output");
listFilesForFolder(folder);
// Always close files.
in.close();
}
catch(FileNotFoundException ex) {
System.out.println(
"Unable to open file '");
}
catch(IOException ex) {
System.out.println(
"Error reading file '"
);
// Or we could just do this:
// ex.printStackTrace();
}
}
private static void listFilesForFolder(File folder) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, JRException, IOException {
for (final File fileEntry : folder.listFiles()) {
if (fileEntry.isDirectory()) {
//listFilesForFolder(fileEntry);
} else {
// System.out.println(fileEntry.getName().substring(0, 30));
//System.out.println(fileEntry.getAbsolutePath());
File fileDir = new File(fileEntry.getAbsolutePath());
String line = null;
String lineNew = "000000000000000000000000000000000";
String[] split = null;
// FileReader reads text files in the default encoding.
BufferedReader in = new BufferedReader(
new InputStreamReader(
new FileInputStream(fileDir), "UTF-8"));
BufferedWriter bufferedWriter = null;
List<String> customerList = new ArrayList<String>();
List<String> recTypeList = new ArrayList<String>();
while((line = in.readLine()) != null) {
// System.out.println(line);
split = line.split("\\|");
bufferedWriter =
new BufferedWriter(new OutputStreamWriter(
new FileOutputStream("D:\\EDWFileProcessing\\output\\simple\\"+split[1]+".txt",true), "UTF-8"));
System.out.println("Split2222222222========>>"+split[2]);
System.out.println("Split2222222222========>>"+recTypeList.contains(split[2]));
if(!recTypeList.contains(split[2])){
recTypeList.add(split[2]);
bufferedWriter.newLine();
bufferedWriter.write(line);
}else{
bufferedWriter.newLine();
line = line.concat("|LL");
bufferedWriter.write(line);
System.out.println("line new.....................");
//bufferedWriter.newLine();
//bufferedWriter.write(lineNew);
// bufferedWriter.newLine();
}
//bufferedWriter.newLine();
bufferedWriter.close();
}
in.close();
}
}
}
}
我尝试使用列表,但"LL"被附加到G2的末尾.
for (ListIterator<String> it = recTypeList.listIterator(); it.hasNext(); i++) {
String s1 = it.next();
if(s1.equals("G2"))
{
int ind=it.previousIndex()-1;
String val=recTypeList.get(ind);
String lastop=val.concat("LL");
bufferedWriter.write(lastop);
System.out.println(lastop);
System.out.println(val);
}
以下是如何找到D#每个的最后一个并在末尾G#附加一个。LL如果我们了解有关格式行为方式的更多信息，它可能会变得更简单。我通过将文件作为字符串并拆分行来代替读取文件，这样这lines就是读完所有行后所得到的内容。
public class Test {
public static void main(String[] args) {
String input =
"0000027788|001400000000000000000001224627|G1| | |G1\r\n" +
"0000027789|001400000000000000000001224627|D1| | |G1\r\n" +
"0000027790|001400000000000000000001224627|D1| | |G1\r\n" +
"0000027790|001400000000000000000001224627|D1| | |G1\r\n" +
"0000027791|001400000000000000000001224627|G2| | |G2\r\n" +
"0000027792|001400000000000000000001224627|D2| | |G2\r\n" +
"0000027793|001400000000000000000001224627|D2| | |G2\r\n" +
"0000027794|001400000000000000000001224627|G6| | |G6";
String[] lines = input.split("\r\n");
String[][] parts = new String[lines.length][];
for (int i = 0; i < lines.length; i++)
parts[i] = lines[i].split("\\|");
String currG = "G1";
String lastD = "";
for (int i = 1; i < lines.length; i++) {
if (parts[i][2].startsWith("G")) {
System.out.println("Last D for " + currG + " is " + lastD + " at line " + (i-1));
lines[i-1] += " LL";
currG = parts[i][2];
}
else
lastD = parts[i][2];
}
System.out.println();
for (int i = 0; i < lines.length; i++)
System.out.println(lines[i]);
}
}
输出：
Last D for G1 is D1 at line 3
Last D for G2 is D2 at line 6
0000027788|001400000000000000000001224627|G1| | |G1
0000027789|001400000000000000000001224627|D1| | |G1
0000027790|001400000000000000000001224627|D1| | |G1
0000027790|001400000000000000000001224627|D1| | |G1 LL
0000027791|001400000000000000000001224627|G2| | |G2
0000027792|001400000000000000000001224627|D2| | |G2
0000027793|001400000000000000000001224627|D2| | |G2 LL
0000027794|001400000000000000000001224627|G6| | |G6
我的假设是第二列只有G#orD#并且在第 0 行它是G1。
编辑：如果我添加到上面的假设中，每个下G#都有D相同的 s#那么这会更短：
public class Test {
public static void main(String[] args) {
String input =
"0000027788|001400000000000000000001224627|G1| | |G1\r\n" +
"0000027789|001400000000000000000001224627|D1| | |G1\r\n" +
"0000027790|001400000000000000000001224627|D1| | |G1\r\n" +
"0000027790|001400000000000000000001224627|D1| | |G1\r\n" +
"0000027791|001400000000000000000001224627|G2| | |G2\r\n" +
"0000027792|001400000000000000000001224627|D2| | |G2\r\n" +
"0000027793|001400000000000000000001224627|D2| | |G2\r\n" +
"0000027794|001400000000000000000001224627|G6| | |G6";
String[] lines = input.split("\r\n");
String[][] parts = new String[lines.length][];
for (int i = 0; i < lines.length; i++)
parts[i] = lines[i].split("\\|");
String currG = "G1";
for (int i = 1; i < lines.length; i++) {
if (parts[i][2].startsWith("G")) {
System.out.println("Last D" + parts[i-1][2].substring(1) + " for " + currG + " is at line " + (i-1));
lines[i-1] += " LL";
currG = parts[i][2];
}
}
System.out.println();
for (int i = 0; i < lines.length; i++)
System.out.println(lines[i]);
}
}
Edit2：文件读写
public class Test {
public static void main(String[] args) {
String input = "path\\to\\input\\text.txt";
String output = "path\\to\\output\\text.txt";
BufferedReader in;
BufferedWriter out;
try {
in = new BufferedReader(new InputStreamReader(new FileInputStream(input), "UTF-8"));
out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(output, true), "UTF-8"));
String line, lastLine;
lastLine = in.readLine();
while ((line = in.readLine()) != null) {
String[] parts = line.split("\\|");
if (parts[2].startsWith("G")) {
lastLine += " LL";
}
out.write(lastLine);
out.write(System.lineSeparator());
lastLine = line;
}
out.write(lastLine);
in.close();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
妥善处理异常情况。
下面是它的工作原理：
lastLineline当搜索新的 .时，保持前一行被读取G。如果找到，则lastLine必须包含前D一个的最后一个。以下是第一次迭代： G
lastLine: G1 0
line: D1 1
---
lastLine: D1 1
line: D1 2
---
lastLine: D1 2
line: D1 3
---
lastLine: D1 3
line: G2 4
// line starts with G, so append LL to lastLine because it's the last D for G1.
---
lastLine: G2 4
line: D2 5
...