Java各種ファイル形式の内容を読み込む
14877 ワード
必要なjarバッグもあまり覚えていないで、みんなは探して、直接コードをつけることができます:
転載先:https://www.cnblogs.com/zwdx/p/7234484.html
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.text.NumberFormat;
import org.apache.commons.io.FileUtils;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.text.PDFTextStripper;
import org.apache.poi.POIXMLDocument;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hwpf.extractor.WordExtractor;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xwpf.extractor.XWPFWordExtractor;
/**
*
*/
public class ReadFileConverter
{
public String getContents(String path) throws Exception
{
String contents = "";
int index = path.lastIndexOf(".");
String file_suffix = path.substring(index+1).toLowerCase();
if(file_suffix.equalsIgnoreCase("txt")||file_suffix.equalsIgnoreCase("log")){
contents = this.readTXT(path);
}
else if(file_suffix.equalsIgnoreCase("xls")){
contents = this.readXLS(path);
}
else if(file_suffix.equalsIgnoreCase("xlsx")){
contents = this.readXLSX(path);
}
else if(file_suffix.equalsIgnoreCase("doc")){
contents = this.readDOC(path);
}
else if(file_suffix.equalsIgnoreCase("docx")){
contents = this.readDOCX(path);
}
else if(file_suffix.equalsIgnoreCase("pdf")){
contents = this.readPDF(path);
}
return contents;
}
public String readXLS(String file) throws Exception
{
StringBuilder content = new StringBuilder();
HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(file));
try{
for(int numSheets = 0; numSheets < workbook.getNumberOfSheets(); numSheets++){
if (null != workbook.getSheetAt(numSheets)){
HSSFSheet aSheet = workbook.getSheetAt(numSheets);// sheet
for(int rowNumOfSheet = 0; rowNumOfSheet <= aSheet.getLastRowNum(); rowNumOfSheet++){
if (null != aSheet.getRow(rowNumOfSheet)){
HSSFRow aRow = aSheet.getRow(rowNumOfSheet); //
for(short cellNumOfRow = 0; cellNumOfRow <= aRow.getLastCellNum(); cellNumOfRow++){
if (null != aRow.getCell(cellNumOfRow)){
HSSFCell aCell = aRow.getCell(cellNumOfRow);//
if (this.convertCell(aCell).length() > 0){
content.append(this.convertCell(aCell));
}
}
content.append("
");
}
}
}
}
}
}
catch(Exception e){
content.append("xls ");
}
finally{
if(workbook!=null){
workbook.close();
}
}
return content.toString();
}
public String readXLSX(String file) throws Exception
{
StringBuilder content = new StringBuilder();
XSSFWorkbook workbook = new XSSFWorkbook(file);
try{
for(int numSheets = 0; numSheets < workbook.getNumberOfSheets(); numSheets++){
if (null != workbook.getSheetAt(numSheets)){
XSSFSheet aSheet = workbook.getSheetAt(numSheets);// sheet
for(int rowNumOfSheet = 0; rowNumOfSheet <= aSheet.getLastRowNum(); rowNumOfSheet++){
if (null != aSheet.getRow(rowNumOfSheet)){
XSSFRow aRow = aSheet.getRow(rowNumOfSheet); //
for(short cellNumOfRow = 0; cellNumOfRow <= aRow.getLastCellNum(); cellNumOfRow++){
if (null != aRow.getCell(cellNumOfRow)){
XSSFCell aCell = aRow.getCell(cellNumOfRow);//
if (this.convertCell(aCell).length() > 0){
content.append(this.convertCell(aCell));
}
}
content.append("
");
}
}
}
}
}
}catch(Exception e){
content.append("xlsx ");
}
finally{
if(workbook!=null){
workbook.close();
}
}
return content.toString();
}
public String readTXT(String file) throws Exception
{
String contents = "";
try{
String encoding = this.get_charset(new File(file));
if (encoding.equalsIgnoreCase("GBK")) {
contents = FileUtils.readFileToString(new File(file), "gbk");
} else {
contents = FileUtils.readFileToString(new File(file), "utf8");
}
}catch(Exception e){
contents = "txt ";
}
return contents;
}
public String readDOC(String file) throws Exception
{
String returnStr;
WordExtractor wordExtractor = new WordExtractor(new FileInputStream(new File(file)));
try{
returnStr = wordExtractor.getText();
}catch(Exception e){
returnStr="doc ";
}
finally{
if(wordExtractor != null){
wordExtractor.close();
}
}
return returnStr;
}
public String readDOCX(String file) throws Exception
{
String docx;
XWPFWordExtractor xwp= new XWPFWordExtractor(POIXMLDocument.openPackage(file));
try{
docx= xwp.getText();
}catch(Exception e){
docx="docx ";
}
finally{
if(xwp !=null){
xwp.close();
}
}
return docx;
}
public String readPDF(String file) throws Exception
{
String result = null;
FileInputStream is = null;
PDDocument document = null;
try{
is = new FileInputStream(file);
document = PDDocument.load(is);
PDFTextStripper stripper = new PDFTextStripper();
result = stripper.getText(document);
}catch(Exception e){
result="pdf ";
}
finally{
if (is != null){
is.close();
}
if (document != null){
document.close();
}
}
return result;
}
private String get_charset(File file) throws IOException
{
String charset = "GBK";
byte[] first3Bytes = new byte[3];
BufferedInputStream bis = null;
try {
boolean checked = false;
bis = new BufferedInputStream(new FileInputStream(file));
bis.mark(0);
int read = bis.read(first3Bytes, 0, 3);
if (read == -1)
return charset;
if (first3Bytes[0] == (byte) 0xFF && first3Bytes[1] == (byte) 0xFE) {
charset = "UTF-16LE";
checked = true;
} else if (first3Bytes[0] == (byte) 0xFE&& first3Bytes[1] == (byte) 0xFF) {
charset = "UTF-16BE";
checked = true;
} else if (first3Bytes[0] == (byte) 0xEF&& first3Bytes[1] == (byte) 0xBB&& first3Bytes[2] == (byte) 0xBF) {
charset = "UTF-8";
checked = true;
}
bis.reset();
if (!checked) {
// int len = 0;
int loc = 0;
while ((read = bis.read()) != -1) {
loc=loc+1;
if (read >= 0xF0)
break;
if (0x80 <= read && read <= 0xBF) // BF , GBK
break;
if (0xC0 <= read && read <= 0xDF) {
read = bis.read();
if (0x80 <= read && read <= 0xBF) // (0xC0 - 0xDF)
// (0x80
// - 0xBF), GB
continue;
else
break;
} else if (0xE0 <= read && read <= 0xEF) {// ,
read = bis.read();
if (0x80 <= read && read <= 0xBF) {
read = bis.read();
if (0x80 <= read && read <= 0xBF) {
charset = "UTF-8";
break;
} else
break;
} else
break;
}
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (bis != null) {
bis.close();
}
}
return charset;
}
@SuppressWarnings("deprecation")
private String convertCell(Cell cell)
{
NumberFormat formater = NumberFormat.getInstance();
formater.setGroupingUsed(false);
String cellValue = "";
if (cell == null) {
return cellValue;
}
switch (cell.getCellTypeEnum()) {
case NUMERIC:
cellValue = formater.format(cell.getNumericCellValue());
break;
case STRING:
cellValue = cell.getStringCellValue();
break;
case BLANK:
cellValue = cell.getStringCellValue();
break;
case BOOLEAN:
cellValue = Boolean.valueOf(cell.getBooleanCellValue()).toString();
break;
case ERROR:
cellValue = String.valueOf(cell.getErrorCellValue());
break;
default:
cellValue = "";
}
return cellValue.trim();
}
}
転載先:https://www.cnblogs.com/zwdx/p/7234484.html