使用apache的IOUtils类完成文件下载(FileDownload)程序

renran421

package com.test;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.commons.io.IOUtils;
import org.junit.BeforeClass;
import org.junit.Test;
public class FileItem {
@BeforeClass
public static void setUpBeforeClass() throws Exception {
}
@Test
public void test() throws FileNotFoundException {
// 模拟从服务器上下载文件
String filename = "D:\\ufsoft\\nchome_huaxin\\modules\\hxsale\\file\\termb.lic";
byte[] data = getFileByteArray(filename);
if (null == data)
throw new FileNotFoundException("文件没有找到！");
// 模拟写入本地磁盘
String filename2 = "c:\\termb.lic";
createNewFile(filename2, data);
}
/**
* 写入本地磁盘
*
* @param filename
* @param data
*/
private void createNewFile(String filename, byte[] data) {
File file = new File(filename);
OutputStream output = null;
try {
if (!file.exists())
file.createNewFile();
output = new FileOutputStream(file);
IOUtils.write(data, output);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (null != output) {
try {
output.close();
} catch (IOException e1) {
e1.printStackTrace();
}
output = null;
}
}
}
/**
* 下载文件
*
* @param filename
* @return
*/
private byte[] getFileByteArray(String filename) {
File file = new File(filename);
InputStream input = null;
byte[] data = null;
try {
if (!file.exists())
return null;
input = new FileInputStream(file);
data = IOUtils.toByteArray(input);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (null != input) {
try {
input.close();
} catch (IOException e1) {
e1.printStackTrace();
}
input = null;
}
}
return data;
}
}