package yuzhengzhong;import java.io.FileWriter;
import java.io.IOException;public class fileWriter {
public static void main(String[] args) throws IOException{
FileWriter fw=new FileWriter("C:\\Documents and Settings\\Administrator\\桌面\\FileTest.txt");
char c[]={'H','e','l','l','o','\n'};
String str="Welcome";
fw.write(c);
fw.write(str);
fw.close();
}
}
这里,一:c字符数组有\n换行呀,可是写到FileTest.txt里却没有换行,结果是HelloWorld,这是为啥
二:这个程序运行的结果,是把原本在FileTest.txt里的内容先删掉,再写入HelloWorld,要是我想保留原来的内容,在后面接着写入HelloWorld要怎么办
import java.io.IOException;public class fileWriter {
public static void main(String[] args) throws IOException{
FileWriter fw=new FileWriter("C:\\Documents and Settings\\Administrator\\桌面\\FileTest.txt");
char c[]={'H','e','l','l','o','\n'};
String str="Welcome";
fw.write(c);
fw.write(str);
fw.close();
}
}
这里,一:c字符数组有\n换行呀,可是写到FileTest.txt里却没有换行,结果是HelloWorld,这是为啥
二:这个程序运行的结果,是把原本在FileTest.txt里的内容先删掉,再写入HelloWorld,要是我想保留原来的内容,在后面接着写入HelloWorld要怎么办
import java.io.FileWriter;
import java.io.IOException;public class FileWriterTest {
public static void main(String[] args) throws IOException{
FileWriter fw=new FileWriter("C:\\Documents and Settings\\Administrator\\桌面\\FileTest.txt",true);
char c[]={'H','e','l','l','o','\n'};
String str="Welcome";
fw.write(c);
fw.write(str);
fw.close();
}
} 1.其实是换行的,你用EditPlus打开看看
2.加个true
try{
File file=new File("C:\\Documents and Settings\\Administrator\\桌面\\FileTest.txt");
if(!file.exists()){
file.createNewFile();
}
OutputStream fileOut = new FileOutputStream(file,true);
Writer fileWriter =
new BufferedWriter(new OutputStreamWriter(fileOut,"gb2312"));
fileWriter.write(msg);
fileWriter.flush();
fileWriter.close();
}catch(IOException ex){
ex.printStackTrace();
}
}
import java.io.*;
public class TextFile throws IOException{
public static void main(String[] args)
{
File file=new File("c:/text.txt");
if(!file.exists())
{
file.createNewFile();
FileWriter w=new FileWriter(file);
w.write("Hello,welcome");
w.close();
}
}
}