「java文件例子」java代码文件
今天给各位分享java文件例子的知识,其中也会对java代码文件进行解释,如果能碰巧解决你现在面临的问题,别忘了关注本站,现在开始吧!
本文目录一览:
java读取文本文件代码
java读取文本文件的方法有很多 这个例子主要介绍最简单 最常用的BufferedReader类 完整例子如下 package net chinaunix blog hzm text;import java io BufferedReader;import java io FileReader;import java io IOException;public class ReadFile {private String path;public ReadFile(String filePath){path = filePath;}public String[] openFile() throws IOException{FileReader fr = new FileReader(path) BufferedReader textReader = new BufferedReader(fr) String[] textData = new String[readLines()];int i;for(i= ; i readLines() i++){textData[i] = textReader readLine() }textReader close() return textData;}int readLines() throws IOException{FileReader fileToRead = new FileReader(path) BufferedReader bf = new BufferedReader(fileToRead) int numberOfLines = ;@SuppressWarnings( unused )String oneLine;while((oneLine = bf readLine()) != null){numberOfLines++;}bf close() return numberOfLines;}}package net chinaunix blog hzm text;import java io IOException;public class FileData {public static void main(String[] args) throws IOException{String filePath = C:/text txt ;try{ReadFile reader = new ReadFile(filePath) String[] content = reader openFile() int i;for(i= ;icontent length;i++){System out println(content[i]) }}catch(IOException e){System out println( 异常信息 + e getMessage()) }}}java io BufferedReaderThe buffer size may be specified or the default size may be used The default is large enough for most purposes In general each read request made of a Reader causes a corresponding read request to be made of the underlying character or byte stream It is therefore advisable to wrap a BufferedReader around any Reader whose read() operations may be costly such as FileReaders and InputStreamReaders For example BufferedReader in = new BufferedReader(new FileReader( foo in )) will buffer the input from the specified file Without buffering each invocation of read() or readLine() could cause bytes to be read from the file converted into characters and then returned which can be very inefficient Programs that use DataInputStreams for textual input can be localized by replacing each DataInputStream with an appropriate BufferedReader java io FileReaderFileReader is meant for reading streams of characters For reading streams of raw bytes consider using a FileInputStream lishixinzhi/Article/program/Java/hx/201311/26249
如何通过JAVA 读取.wps et及 dps文件格式的内容
下面是三个java例子,关于读取wps/et/dps的方法
1.读取wps(读取文本): 通过流加载wps文件,读取文字内容
import com.spire.doc.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
public class ReadTextFromWPS {
public static void main(String[] args) throws IOException{
//通过流加载WPS文字文档
FileInputStream inputStream = new FileInputStream(new File("test.wps"));
Document doc = new Document();
doc.loadFromStream(inputStream, FileFormat.Doc);
//获取文本保存为String
String text = doc.getText();
//将String写入Txt
writeStringToTxt(text,"读取WPS文本.txt");
}
public static void writeStringToTxt(String content, String txtFileName) throws IOException {
FileWriter fWriter= new FileWriter(txtFileName,true);
try {
fWriter.write(content);
}catch(IOException ex){
ex.printStackTrace();
}finally{
try{
fWriter.flush();
fWriter.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
}
2. 读取et:直接加载et格式的表格文件,读取数据
import com.spire.xls.*;
public class ExcelToText {
public static void main(String[] args) {
//加载et格式的表格文件
Workbook workbook = new Workbook();
workbook.loadFromFile("test.et");
//获取工作表
Worksheet sheet = workbook.getWorksheets().get(0);
//获取指定单元格中的文本数据
CellRange range = sheet.getCellRange("A1");
String text = range.getText().trim();
System.out.println(text);
}
}
3.读取dps:直接加载dps格式的幻灯片文档,读取文本
import com.spire.presentation.IAutoShape;
import com.spire.presentation.ISlide;
import com.spire.presentation.ParagraphEx;
import com.spire.presentation.Presentation;
import java.io.FileWriter;
public class ExtractText {
public static void main(String[]args) throws Exception{
//加载测试文档
Presentation ppt = new Presentation();
//ppt.loadFromFile("test.pptx");
ppt.loadFromFile("test.dps");
StringBuilder buffer = new StringBuilder();
//遍历文档中的幻灯片,提取文本
for (Object slide : ppt.getSlides())
{
for (Object shape : ((ISlide) slide).getShapes())
{
if (shape instanceof IAutoShape)
{
for (Object tp : ((IAutoShape) shape).getTextFrame().getParagraphs())
{
buffer.append(((ParagraphEx) tp).getText());
}
}
}
}
//保存到文本文件
FileWriter writer = new FileWriter("ExtractTextfromDPS.txt");
writer.write(buffer.toString());
writer.flush();
writer.close();
}
}
这里须在Java程序中导入spire.office.jar文件。
java中怎样从一个文件中读取文件信息
java读取文件路径、所占空间大小等文件消息,主要是使用FileInputStream类来操作,示例如下:
import java.io.File;
import java.io.FileInputStream;
public class ceshi {
public static void main(String[] args) throws Exception {
java.io.File localFile = new File("D:\\1.txt");
FileInputStream ins = new FileInputStream(localFile);
int countLen = ins.available();
byte[] m_binArray = new byte[countLen];
ins.read(m_binArray);
ins.close();
System.out.println(localFile.getAbsoluteFile() + " "
+ localFile.getFreeSpace());
}
}
运行结果如下:
java文件例子的介绍就聊到这里吧,感谢你花时间阅读本站内容,更多关于java代码文件、java文件例子的信息别忘了在本站进行查找喔。
发布于:2022-12-28,除非注明,否则均为
原创文章,转载请注明出处。