[Java]远程下载文件并读取实例方法

简单的文件下载后读取显示，该方法可返回内容的结果集。一般适用于文本文档的下载，以供学习交流。

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/**

* 远程下载文件并读取返回p

* @param filePath 文件网络地址 如http://www.baidu.com/1.txt

* @return String

*/

public String DownAndReadFile(String filePath){

String date = new SimpleDateFormat("yyyy-MM-dd").format(new Date());

File savePath = new File("D://"+date);//创建新文件

if (!savePath.exists()) {

savePath.mkdir();

}

String[] urlname = filePath.split("/");

int len = urlname.length-1;

String uname = urlname[len];//获取文件名

try {

File file = new File(savePath+"//"+uname);//创建新文件

if(file!=null && !file.exists()){

file.createNewFile();

}

OutputStream oputstream = new FileOutputStream(file);

URL url = new URL(filePath);

HttpURLConnection uc = (HttpURLConnection) url.openConnection();

uc.setDoInput(true);//设置是否要从 URL 连接读取数据,默认为true

uc.connect();

InputStream iputstream = uc.getInputStream();

System.out.println("file size is:"+uc.getContentLength());//打印文件长度

byte[] buffer = new byte[4*1024];

int byteRead = -1;

while((byteRead=(iputstream.read(buffer)))!= -1){

oputstream.write(buffer, 0, byteRead);

}

oputstream.flush();

iputstream.close();

oputstream.close();

//读取文件

StringBuffer strb = new StringBuffer();

FileInputStream fs = new FileInputStream(new File(savePath+"//"+uname));

InputStreamReader isr = new InputStreamReader(fs,"UTF-8");

BufferedReader br = new BufferedReader(isr);

String data = "";

while((data = br.readLine()) != null){

strb.append(data + "\n");

}

br.close();

fs.close();

isr.close();

System.out.println(strb.toString());

return strb.toString();



} catch (Exception e) {

System.out.println("读取失败！");

e.printStackTrace();

}

return null;

}