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云南大王-java 文件复制
发布时间：2020-04-13 00:00:00
public class CopyText {
public static void main(String[] args) {
copy_1();
}
public static void copy_1() {
FileWriter fw = null;
FileReader fr = null;
try {
fw = new FileWriter("demo_desc.txt");
//与已有文件关联
fr = new FileReader("demo_src.txt");
int ch = 0;
while ((ch = fr.read()) != -1) {
fw.write(ch);
}
} catch (IOException e) {
throw new RuntimeException("读写失败!");
} finally {
if (fr != null) {
try {
fr.close();
} catch (IOException e) {
throw new RuntimeException("关闭流失败!");
}
}
if (fw != null) {
try {
fr.close();
} catch (IOException e) {
throw new RuntimeException("关闭流失败!");
}
}
}
}
public static void copy_2() {
FileWriter fw = null;
FileReader fr = null;
try {
fw = new FileWriter("demo_desc.txt");
//与已有文件关联
fr = new FileReader("demo_src.txt");
char[] buf = new char[1024];
int num = 0;
while ((num = fr.read(buf)) != -1) {
fw.write(buf, 0, num);
}
} catch (IOException e) {
throw new RuntimeException("读写失败!");
} finally {
if (fr != null) {
try {
fr.close();
} catch (IOException e) {
throw new RuntimeException("关闭流失败!");
}
}
if (fw != null) {
try {
fr.close();
} catch (IOException e) {
throw new RuntimeException("关闭流失败!");
}
}
}
}
}
