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FileReaderWriterTest.java
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125 lines (99 loc) · 2.73 KB
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package IO;
import org.junit.Test;
import java.io.*;
public class FileReaderWriterTest {
//测试FileReader中的read（）方法
@Test
public void test() {
File file = new File("hello.txt");
FileReader fr = null;
try {
fr = new FileReader(file);
int data;
while ((data = fr.read()) != -1){
System.out.print((char)data);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
fr.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
//测试FileReader中的read（cbuf[])方法
@Test
public void test1() {
File file1 = new File("hello.txt");
FileReader fr = null;
try {
fr = new FileReader(file1);
char[] cbuf = new char[5];
int len;
while ((len = fr.read(cbuf)) != -1){
for (int i = 0; i < len; i++) {
System.out.print(cbuf[i]);
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
fr.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
//测试FileWriter中的write（）方法
@Test
public void testFileWriter(){
File file = new File("hello1.txt");
FileWriter fw = null;
try {
fw = new FileWriter(file);
fw.write("I have a dream !\n");
fw.write("Hello I know");
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
fw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
//将文件读取，并写入另一个文件
@Test
public void testFileReaderFileWriter() {
File file1 = new File("hello.txt");
File file2 = new File("test.txt");
FileReader fr = null;
FileWriter fw = null;
try {
fr = new FileReader(file1);
fw = new FileWriter(file2);
char[] cbuf = new char[5];
int len;
while ((len = fr.read(cbuf)) != -1){
fw.write(cbuf,0,len);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
fw.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
fr.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}