java读取txt文件实例有没有

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逐行读取文本内容
1.引仔铅芦包
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;

2.获得文件路径和文件名
String filePathName = path + filename;

3.获得File对象，念带建立FileReader对象，并实例化为fr，建立BufferedReader对象，并实例化为br
File file = new File(filePathName);
FileReader fr = new FileReader(file);
BufferedReader br = new BufferedReader(fr);

4.获激世得一行数据
line = (String) br.readLine();

5.关闭BufferedReader，FileReader
br.close();
fr.close();

public class IOTest {
public static void main(String[] args){
File f = new File("E:\\1.txt");
//读
String oldStr = "";
try {
FileReader fr = new FileReader(f);
BufferedReader br = new BufferedReader(fr);
String line = null;
while((line = br.readLine())!=null){
oldStr += line;
}
} catch (FileNotFoundException e1) {
e1.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

//写
String newStr = "zxc";
FileWriter fw;
try {
fw = new FileWriter(f);
BufferedWriter bw = new BufferedWriter(fw);
bw.write(oldStr+"\r\n"+newStr);//不想换行就把\r\n去掉
bw.close();
fw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
这样就ok了，自己总结的。

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http://www.pconline.com.cn/pcedu/empolder/gj/java/0502/559401_1.html
java操作文滚族销件大游大全穗举

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用输出输出流的方法

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