FileWriter 追加文件及文件改名
我就废话不多说了，大家还是直接看代码吧~
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
public class FileWriterUtil {
/**
* 追加文件：使用FileWriter
*/
public static void appendMethod(String fileName, String content) {
try {
//打开一个写文件器，构造函数中的第二个参数true表示以追加形式写文件
FileWriter writer = new FileWriter(fileName, true);
writer.write(content);
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 修改文件名
* @param oldFilePath
* @param newFileName
*/
public static void reNameLogFile(String oldFilePath,String newFileName){
File f=new File(oldFilePath);
String c=f.getParent();
// File mm=new File(c + File.pathSeparator + newFileName + "_" + CommonUtil.getCurrTimeForString());
File mm=new File(c + "/" + newFileName + "_" + CommonUtil.getBeforeDateStr());
if(f.renameTo(mm)){
System.out.println("修改文件名成功!");
}else{
System.out.println("修改文件名失败");
}
}
public static void main(String[] args) {
String fileName = "/Users/qin/Downloads/callLog.txt";
String content = "new append!";
FileWriterUtil.appendMethod(fileName, content);
FileWriterUtil.appendMethod(fileName, "append end. \n");
FileWriterUtil.reNameLogFile("/Users/qin/Downloads/callLog.txt","rayda");
}
}
Java PrintWriter&FileWriter 写入追加到文件
用PrintWriter写入文件
import java.io.IOException;
import java.io.PrintWriter;
public class PrintWriteDemo
{
public static void main(String[] args) throws IOException
{
PrintWriter out = new PrintWriter("01.txt");
out.print("the quick brown fox");
out.println(" jumps over the lazy dog.");
out.write("work is like a capricious lover whose ");
out.write("incessant demands are resented but who is missed terribly when she is not there\n");
out.close(); //如果不关闭文件，文件停留在buffer zone, 不会写进"01.txt"中
}
}
FileWriter只能写入文件，无法往文件中追加内容
用FileWriter写入和追加文件
import java.io.IOException;
import java.io.FileWriter;
public class FileWriterDemo
{
public static void main(String[] args) throws IOException
{
FileWriter out = new FileWriter("02.txt");
//constructor中添加true,即FileWriter out = new FileWriter("02.txt", true)就是往02.txt中追加文件了
out.write("work is like a capricious lover whose ");
out.write("incessant demands are resented but who is missed terribly when she is not there\n");
out.write(98.7 + "\n");
out.close(); //很重要，一定记得关闭文件
}
}
都别忘记 throws IOException
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。
