我从编码站点获得了以下程序.
以下代码读取文本文件并查找重复的单词.
从每个文本文件中读取并显示它的重复单词逐行计数.
如果它没有存储为String,如何调用该文件,我使用缓冲读取器,但我没有得到我的输出.
我的问题:
>如何让程序从给定文件夹中读取多个文件?
>如何以Excel文件格式保存结果?
任何建议欢迎.
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.Map.Entry;
public class MaxDuplicateWordCount {
public Map<String, Integer> getWordCount(String fileName){
FileInputStream fis = null;
DataInputStream dis = null;
BufferedReader br = null;
Map<String, Integer> wordMap = new HashMap<String, Integer>();
try {
fis = new FileInputStream(fileName);
dis = new DataInputStream(fis);
br = new BufferedReader(new InputStreamReader(dis));
String line = null;
while((line = br.readLine()) != null){
StringTokenizer st = new StringTokenizer(line, " ");
while(st.hasMoreTokens()){
String tmp = st.nextToken().toLowerCase();
if(wordMap.containsKey(tmp)){
wordMap.put(tmp, wordMap.get(tmp)+1);
} else {
wordMap.put(tmp, 1);
}
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally{
try{if(br != null) br.close();}catch(Exception ex){}
}
return wordMap;
}
public List<Entry<String, Integer>> sortByValue(Map<String, Integer> wordMap){
Set<Entry<String, Integer>> set = wordMap.entrySet();
List<Entry<String, Integer>> list = new ArrayList<Entry<String, Integer>>(set);
Collections.sort( list, new Comparator<Map.Entry<String, Integer>>()
{
public int compare( Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2 )
{
return (o2.getValue()).compareTo( o1.getValue() );
}
} );
return list;
}
public static void main(String a[]){
MaxDuplicateWordCount mdc = new MaxDuplicateWordCount();
Map<String, Integer> wordMap = mdc.getWordCount("E:\\Blog 39.txt");
List<Entry<String, Integer>> list = mdc.sortByValue(wordMap);
for(Map.Entry<String, Integer> entry:list){
System.out.println(entry.getKey()+" ="+entry.getValue());
}
}
}
最佳答案 介绍
在与OP聊天之后,简要介绍OP需要什么:
1-从特定文件夹中读取文件,文件通常是Unicode作为文本文件.
2-文件将在问题中的OP算法中处理,并且算法的结果应该再次保存在Unicode文件中(由于Unicode与Excel的兼容性,后来OP要求保存为Excel文件(.XLS))
解
这可以通过以下步骤解决:
第1步我们定义(声明)我们的工作空间
步骤2如果不存在,我们在工作空间中创建输出文件夹
步骤3我们读取工作空间文件夹中的所有现有文件,并在算法中处理它们.
步骤4每个文件的结果将保存为输出文件夹中的Excel文件.
代码
首先,您需要导入POI包,这将允许您创建XLS表.我已下载此poi/poi-3.5-FINAL.jar.zip( 1,372 k),并且以下导入应添加到您的代码中.
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFRow;
接下来,您将以下代码添加到代码中,它是可自行解释的代码:
final static String WORKSPACE = "C:/testfolder/";
private static void createOutputFolder(String outputFolderName) {
File outputDirectory = new File(WORKSPACE + outputFolderName);
if (!outputDirectory.exists()) {
try {
outputDirectory.mkdir();
} catch (Exception e) {
}
}
}
private static void exlCreator() {
String outputFolder = "output/";
String fileName, fileNameWPathInput;
int serialNumber = 1;
createOutputFolder(outputFolder);
MaxDuplicateWordCount mdc = new MaxDuplicateWordCount();
File folder = new File(WORKSPACE);
File[] listOfFiles = folder.listFiles();
for (int i = 0; i < listOfFiles.length; i++) {
if (listOfFiles[i].isFile()) {
fileName = listOfFiles[i].getName();
fileNameWPathInput = WORKSPACE + fileName;
Map<String, Integer> wordMap = mdc.getWordCount(fileNameWPathInput);
List<Entry<String, Integer>> list = mdc.sortByValue(wordMap);
String fileNameWPathOutput = WORKSPACE + outputFolder +
fileName.substring(0, fileName.length() - 4)
+ "output.xls";
try {
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet("ResultSheet");
HSSFRow rowhead = sheet.createRow((short) 0);
rowhead.createCell(0).setCellValue("Serial No.");
rowhead.createCell(1).setCellValue("Word");
rowhead.createCell(2).setCellValue("Count");
for (Map.Entry<String, Integer> entry : list) {
HSSFRow row = sheet.createRow((short) serialNumber);
row.createCell(0).setCellValue(serialNumber);
row.createCell(1).setCellValue(entry.getKey());
row.createCell(2).setCellValue(entry.getValue());
serialNumber++;
}
FileOutputStream fileOut = new FileOutputStream(fileNameWPathOutput);
workbook.write(fileOut);
fileOut.close();
serialNumber = 1;
System.out.println(fileNameWPathOutput + " is created");
} catch (Exception ex) {
System.out.println(ex);
}
}
}
}
public static void main(String [] args) throws IOException {
exlCreator();
}
最后
通过操作代码,可以创建一个输出文件,但可以在工作表中创建每个输出结果.
正如您在下图中看到的那样,输出文件在Excel中打开,显示没有问题的Unicode文本,因为这是我的第一个解决方案中的问题:
链接
Download POI
POI documentation
Unicode problem in CSV
More about CSV
完整代码,请求OP
import java.io.*;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.Map.Entry;
//for Excel ark
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFRow;
public class MaxDuplicateWordCount {
public Map<String, Integer> getWordCount(String fileName) {
FileInputStream fis = null;
DataInputStream dis = null;
BufferedReader br = null;
Map<String, Integer> wordMap = new HashMap<String, Integer>();
try {
fis = new FileInputStream(fileName);
dis = new DataInputStream(fis);
br = new BufferedReader(new InputStreamReader(dis));
String line = null;
while ((line = br.readLine()) != null) {
StringTokenizer st = new StringTokenizer(line, " ");
while (st.hasMoreTokens()) {
String tmp = st.nextToken().toLowerCase();
if (wordMap.containsKey(tmp)) {
wordMap.put(tmp, wordMap.get(tmp) + 1);
} else {
wordMap.put(tmp, 1);
}
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (br != null) br.close();
} catch (Exception ex) {
}
}
return wordMap;
}
public List<Entry<String, Integer>> sortByValue(Map<String, Integer> wordMap) {
Set<Entry<String, Integer>> set = wordMap.entrySet();
List<Entry<String, Integer>> list = new ArrayList<Entry<String, Integer>>(set);
Collections.sort(list, new Comparator<Map.Entry<String, Integer>>() {
public int compare(Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2) {
return (o2.getValue()).compareTo(o1.getValue());
}
});
return list;
}
final static String WORKSPACE = "C:/testfolder/";
private static void createOutputFolder(String outputFolderName) {
File outputDirectory = new File(WORKSPACE + outputFolderName);
if (!outputDirectory.exists()) {
try {
outputDirectory.mkdir();
} catch (Exception e) {
}
}
}
private static void exlCreator() {
String outputFolder = "output/";
String fileName, fileNameWPathInput;
int serialNumber = 1;
createOutputFolder(outputFolder);
MaxDuplicateWordCount mdc = new MaxDuplicateWordCount();
File folder = new File(WORKSPACE);
File[] listOfFiles = folder.listFiles();
for (int i = 0; i < listOfFiles.length; i++) {
if (listOfFiles[i].isFile()) {
fileName = listOfFiles[i].getName();
fileNameWPathInput = WORKSPACE + fileName;
Map<String, Integer> wordMap = mdc.getWordCount(fileNameWPathInput);
List<Entry<String, Integer>> list = mdc.sortByValue(wordMap);
String fileNameWPathOutput = WORKSPACE + outputFolder +
fileName.substring(0, fileName.length() - 4)
+ "output.xls";
try {
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet("ResultSheet");
HSSFRow rowhead = sheet.createRow((short) 0);
rowhead.createCell(0).setCellValue("Serial No.");
rowhead.createCell(1).setCellValue("Word");
rowhead.createCell(2).setCellValue("Count");
for (Map.Entry<String, Integer> entry : list) {
HSSFRow row = sheet.createRow((short) serialNumber);
row.createCell(0).setCellValue(serialNumber);
row.createCell(1).setCellValue(entry.getKey());
row.createCell(2).setCellValue(entry.getValue());
serialNumber++;
}
FileOutputStream fileOut = new FileOutputStream(fileNameWPathOutput);
workbook.write(fileOut);
fileOut.close();
serialNumber = 1;
System.out.println(fileNameWPathOutput + " is created");
} catch (Exception ex) {
System.out.println(ex);
}
}
}
}
public static void main(String[] args) throws IOException {
exlCreator();
}
}