java文件操作（普通文件以及配置文件的读写操作）

/**
* xiangqiao123欢迎你  如果对代码有疑问可以加qq群咨询：151648295
*
* 读取MyFile文件
*/
package com.xiangqiao123.file;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;

public class ReadFile {

public static void main(String[] args) {
try {
// 注意路径的写法，java默认的路径是到根目录下
File f = new File("src/MyFile.text");
if (f.isFile() && f.exists()) {
// 进行编码转换，避免出现乱码
InputStreamReader read = new InputStreamReader(new FileInputStream(f), "utf-8");
BufferedReader br = new BufferedReader(read);
String line = null;
while ((line = br.readLine()) != null) {
System.out.println(line);
}
read.close();
}else {
System.out.println("文件读取失败");
}
} catch (Exception e) {
e.printStackTrace();
}

}

}

/**
* xiangqiao123欢迎你  如果对代码有疑问可以加qq群咨询：151648295
*
*向文件里面写内容
*/
package com.xiangqiao123.file;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;

public class WriteFile {
public static void main(String[] args) {
// 注意文件的路径写法
File f = new File("src/MyFile.text");
if (f.isFile() && f.exists()) {
System.out.println("123");
try {
// new FileOutputStream(f, true)
// 第二个参数是true表示以后写的内容不会覆盖原来的，而是添加内容
OutputStreamWriter writer = new OutputStreamWriter(
new FileOutputStream(f, true), "utf-8");
BufferedWriter bw = new BufferedWriter(writer);
// BufferedWriter bw=new BufferedWriter(new FileWriter(f,true));
bw.write("写入文件的内容");
// 换行操作
bw.newLine();
// 清除缓冲，如果不写：信息不会写入文件
bw.flush();
writer.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}
}

/**
*xiangqiao123欢迎你  如果对代码有疑问可以加qq群咨询：151648295
*
读取配置文件info.properties
*/
package com.xiangqiao123.file;

import java.io.File;
import java.io.FileInputStream;
import java.util.Properties;

public class ReadInfoFile {

public static void main(String[] args) {
Properties p = new Properties();
//注意路径
File f = new File("src/info.properties");
try {
FileInputStream fis = new FileInputStream(f);
p.load(fis);
System.out.println(p.get("first"));

} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}

/**
* xiangqiao123欢迎你  如果对代码有疑问可以加qq群咨询：151648295
*
* 网配置文件里面写内容
*/
package com.xiangqiao123.file;

import java.io.File;
import java.io.FileOutputStream;
import java.util.Properties;

public class WriteInfoFile {

public static void main(String[] args) {
Properties p = new Properties();
File f = new File("src/info.properties");
try {
FileOutputStream fos = new FileOutputStream(f, true);
// 要添加的内容
p.setProperty("first", "hello");
p.store(fos, null);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}