我是java新手,目前正尝试使用此tut将一些字符串写入文本文件: http://www.homeandlearn.co.uk/java/write_to_textfile.html
所以这是我的代码:
public void savefile() throws IOException {
JOptionPane.showMessageDialog(null,"Hi,i'm in Try Block :|");
FileWriter write = new FileWriter("asd.txt", true);
PrintWriter print = new PrintWriter(write);
JOptionPane.showMessageDialog(null, "File Opened");
write.write("Knock Knock");
print.flush();
print.write("Hello ?");
print.flush();
print.printf("Hi?");
print.flush();
print.println("anybody there?");
print.flush();
JOptionPane.showMessageDialog(null, "Can you hear me ?");
print.close();
JOptionPane.showMessageDialog(null, "File Closed");
}
这就是我调用方法的方法:
try {
savefile();
}
catch (IOException e) {
JOptionPane.showMessageDialog(null, "Error: " + e.getMessage());
}
但文件中没有任何内容!我真的厌倦了这个;我做错了什么?
答案 0 :(得分:2)
代码很好。
您应该查看正确的文件。如果在Eclipse或Netbeans中运行该文件,则创建的文本文件位于项目目录中。
答案 1 :(得分:1)
public void saveFile()
{
BufferedWriter bufferedWriter = null;
try
{
bufferedWriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File("asd.txt"))));
bufferedWriter.writeLine("Hello world!");
}
catch(IOException e)
{
e.printStackTrace();
}
finally
{
if(bufferedWriter != null)
{
try
{
bufferedWriter.close();
}
catch(IOException e) {}
}
}
}
答案 2 :(得分:1)
代码完美无缺。 测试代码:
public class ij3
{
public void savefile() throws IOException
{
JOptionPane.showMessageDialog(null,"Hi,i'm in Try Block :|");
FileWriter write = new FileWriter("asd.txt",true);
PrintWriter print = new PrintWriter(write);
JOptionPane.showMessageDialog(null,"File Opened");
write.write("Knock Knock");
print.flush();
print.write("Hello ?");
print.flush();
print.printf("Hi?");
print.flush();
print.println("anybody there?");
print.flush();
JOptionPane.showMessageDialog(null,"Can you hear me ?");
print.close();
JOptionPane.showMessageDialog(null,"File Closed");
}
public static void main(String [] args)
{
ij3 s = new ij3();
try
{
s.savefile();
}
catch (IOException e){
JOptionPane.showMessageDialog(null,"Error: "+e.getMessage());
}
}
}
答案 3 :(得分:0)
为了处理文件,有不同种类的Java类,如字符流和字节流。程序使用字节流来执行8位字节的输入和输出。所有字节流类都来自InputStream和OutputStream.All字符流类来自Reader和Writer。写入文本文件有不同的样式。更好地关注此链接http://www.tutorialspoint.com/java/java_files_io.htm
。快乐编码
答案 4 :(得分:0)
我尝试了以下代码并且工作正常。请提供准确的错误消息
public class Writer {
/**
* @param args
*/
public static void main(String[] args) {
try {
new Writer().savefile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void savefile() throws IOException {
FileWriter write = new FileWriter("d:/asd.txt");
PrintWriter print = new PrintWriter(write);
write.write("Knock Knock");
print.flush();
print.write("Hello ?");
print.flush();
print.printf("Hi?");
print.flush();
print.println("anybody there?");
print.flush();
print.close();
}
}