import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.RandomAccessFile;

public class WriteStringToTxt {

    public void WriteStringToFile(String filePath) {
        try {
            File file = new File(filePath);
            PrintStream ps = new PrintStream(new FileOutputStream(file));
            ps.println("http://www.jb51.net");// 往文件里写入字符串
            ps.append("http://www.jb51.net");// 在已有的基础上添加字符串
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public void WriteStringToFile2(String filePath) {
        try {
            FileWriter fw = new FileWriter(filePath, true);
            BufferedWriter bw = new BufferedWriter(fw);
            bw.append("在已有的基础上添加字符串");
            bw.write("abc\r\n ");// 往已有的文件上添加字符串
            bw.write("def\r\n ");
            bw.write("hijk ");
            bw.close();
            fw.close();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public void WriteStringToFile3(String filePath) {
        try {
            PrintWriter pw = new PrintWriter(new FileWriter(filePath));
            pw.println("abc ");
            pw.println("def ");
            pw.println("hef ");
            pw.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public void WriteStringToFile4(String filePath) {
        try {
            RandomAccessFile rf = new RandomAccessFile(filePath, "rw");
            rf.writeBytes("op\r\n");
            rf.writeBytes("app\r\n");
            rf.writeBytes("hijklllll");
            rf.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void WriteStringToFile5(String filePath) {
        try {
            FileOutputStream fos = new FileOutputStream(filePath);
            String s = "http://www.jb51.netl";
            fos.write(s.getBytes());
            fos.close();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        String filePath = "E:\\link.txt";
        // new WriteStringToTxt().WriteStringToFile(filePath);
        // new WriteStringToTxt().WriteStringToFile2(filePath);
        // new WriteStringToTxt().WriteStringToFile3(filePath);
        // new WriteStringToTxt().WriteStringToFile4(filePath);
        new WriteStringToTxt().WriteStringToFile5(filePath);
    }
}

java的io操作(将字符串写入到txt文件中)