用Java创建和写入(文本)文件的最简单方法是什么?
当前回答
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
public class FileWriterExample {
public static void main(String [] args) {
FileWriter fw= null;
File file =null;
try {
file=new File("WriteFile.txt");
if(!file.exists()) {
file.createNewFile();
}
fw = new FileWriter(file);
fw.write("This is an string written to a file");
fw.flush();
fw.close();
System.out.println("File written Succesfully");
} catch (IOException e) {
e.printStackTrace();
}
}
}
其他回答
只有一行!路径和行是字符串
import java.nio.file.Files;
import java.nio.file.Paths;
Files.write(Paths.get(path), lines.getBytes());
如果您已经有了要写入文件的内容(而不是动态生成的),那么Java7中作为本机I/O的一部分添加的java.nio.file.Files提供了实现目标的最简单、最有效的方法。
基本上,创建和写入文件只需一行,而且只需一个简单的方法调用!
以下示例创建并写入6个不同的文件,以展示如何使用它:
Charset utf8 = StandardCharsets.UTF_8;
List<String> lines = Arrays.asList("1st line", "2nd line");
byte[] data = {1, 2, 3, 4, 5};
try {
Files.write(Paths.get("file1.bin"), data);
Files.write(Paths.get("file2.bin"), data,
StandardOpenOption.CREATE, StandardOpenOption.APPEND);
Files.write(Paths.get("file3.txt"), "content".getBytes());
Files.write(Paths.get("file4.txt"), "content".getBytes(utf8));
Files.write(Paths.get("file5.txt"), lines, utf8);
Files.write(Paths.get("file6.txt"), lines, utf8,
StandardOpenOption.CREATE, StandardOpenOption.APPEND);
} catch (IOException e) {
e.printStackTrace();
}
这里有一个创建或覆盖文件的小示例程序。这是一个长版本,因此可以更容易理解。
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
public class writer {
public void writing() {
try {
//Whatever the file path is.
File statText = new File("E:/Java/Reference/bin/images/statsTest.txt");
FileOutputStream is = new FileOutputStream(statText);
OutputStreamWriter osw = new OutputStreamWriter(is);
Writer w = new BufferedWriter(osw);
w.write("POTATO!!!");
w.close();
} catch (IOException e) {
System.err.println("Problem writing to the file statsTest.txt");
}
}
public static void main(String[]args) {
writer write = new writer();
write.writing();
}
}
要创建文件而不覆盖现有文件,请执行以下操作:
System.out.println("Choose folder to create file");
JFileChooser c = new JFileChooser();
c.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
c.showOpenDialog(c);
c.getSelectedFile();
f = c.getSelectedFile(); // File f - global variable
String newfile = f + "\\hi.doc";//.txt or .doc or .html
File file = new File(newfile);
try {
//System.out.println(f);
boolean flag = file.createNewFile();
if(flag == true) {
JOptionPane.showMessageDialog(rootPane, "File created successfully");
}
else {
JOptionPane.showMessageDialog(rootPane, "File already exists");
}
/* Or use exists() function as follows:
if(file.exists() == true) {
JOptionPane.showMessageDialog(rootPane, "File already exists");
}
else {
JOptionPane.showMessageDialog(rootPane, "File created successfully");
}
*/
}
catch(Exception e) {
// Any exception handling method of your choice
}
以下是编写文件的代码,也在退出帮助内容网页时删除:
public String writeHelpContent(String filePath, String helpPageContent) throws IOException{
logger.info("HowToUseRiskOfficeHelpService - writeHelpContent start");
File file = new File(filePath);
try(FileWriter fw = new FileWriter(file);){
file.deleteOnExit();
if(file.createNewFile()) {
logger.info("HowToUseRiskOfficeHelpService - file created successfully");
}else {
logger.info("HowToUseRiskOfficeHelpService - file already exists");
}
fw.write(helpPageContent);
fw.flush();
}
return "Sucessfully write into help page file";
}
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