Created
November 6, 2016 10:07
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Java 写内容到文件中
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public class AppendToFile { | |
/** | |
* A方法追加文件:使用RandomAccessFile | |
*/ | |
public static void appendMethodA(String fileName, String content) { | |
try { | |
// 打开一个随机访问文件流,按读写方式 | |
RandomAccessFile randomFile = new RandomAccessFile(fileName, "rw"); | |
// 文件长度,字节数 | |
long fileLength = randomFile.length(); | |
//将写文件指针移到文件尾。 | |
randomFile.seek(fileLength); | |
randomFile.writeBytes(content); | |
randomFile.close(); | |
} catch (IOException e) { | |
e.printStackTrace(); | |
} | |
} | |
/** | |
* B方法追加文件:使用FileWriter | |
*/ | |
public static void appendMethodB(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(); | |
} | |
} | |
public static void main(String[] args) { | |
String fileName = "C:/temp/newTemp.txt"; | |
String content = "new append!"; | |
//按方法A追加文件 | |
AppendToFile.appendMethodA(fileName, content); | |
AppendToFile.appendMethodA(fileName, "append end. \n"); | |
//显示文件内容 | |
ReadFromFile.readFileByLines(fileName); | |
//按方法B追加文件 | |
AppendToFile.appendMethodB(fileName, content); | |
AppendToFile.appendMethodB(fileName, "append end. \n"); | |
//显示文件内容 | |
ReadFromFile.readFileByLines(fileName); | |
} | |
} |
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