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2015-02-20 06:30:01
下面示例代码演示使用PrintWriter方法写文件。
PrintWriter的构造函数接受FileWriter作为参数。得到PrintWriter实例之后调用其println()方法即可写入字符串。
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
public class FileUtil {
public void writeLinesToFile(String filename,
String[] linesToWrite,
boolean appendToFile) {
PrintWriter pw = null;
try {
if (appendToFile) {
//If the file already exists, start writing at the end of it.
pw = new PrintWriter(new FileWriter(filename, true));
}
else {
pw = new PrintWriter(new FileWriter(filename));
//this is equal to:
//pw = new PrintWriter(new FileWriter(filename, false));
}
for (int i = 0; i < linesToWrite.length; i ) {
pw.println(linesToWrite[i]);
}
pw.flush();
}
catch (IOException e) {
e.printStackTrace();
}
finally {
//Close the PrintWriter
if (pw != null)
pw.close();
}
}
public static void main(String[] args) {
FileUtil util = new FileUtil();
util.writeLinesToFile(“myfile.txt”, new String[] {“Line 1”,
“Line 2”,
“Line 3”}, true);
}
}
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