java 从网络Url中下载文件 && java调用url接口
/**
* 从网络Url中下载文件
* @param urlStr
* @param fileName
* @param savePath
* @throws IOException
*/
public static void downLoadFromUrl(String urlStr,String fileName,String savePath) throws IOException{
URL url = new URL(urlStr);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
//设置超时间为3秒
conn.setConnectTimeout(3*1000);
//防止屏蔽程序抓取而返回403错误
conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
//得到输入流
InputStream inputStream = conn.getInputStream();
//获取自己数组
byte[] getData = readInputStream(inputStream);
//文件保存位置
File saveDir = new File(savePath);
if(!saveDir.exists()){
saveDir.mkdir();
}
File file = new File(saveDir+File.separator+fileName);
FileOutputStream fos = new FileOutputStream(file);
fos.write(getData);
if(fos!=null){
fos.close();
}
if(inputStream!=null){
inputStream.close();
}
System.out.println("info:"+url+" download success");
}
/**
* 从输入流中获取字节数组
* @param inputStream
* @return
* @throws IOException
*/
public static byte[] readInputStream(InputStream inputStream) throws IOException {
byte[] buffer = new byte[1024];
int len = 0;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
while((len = inputStream.read(buffer)) != -1) {
bos.write(buffer, 0, len);
}
bos.close();
return bos.toByteArray();
}
public static void main(String[] args) {
try{
downLoadFromUrl("http://101.95.48.97:8005/res/upload/interface/apptutorials/manualstypeico/6f83ce8f-0da5-49b3-bac8-fd5fc67d2725.png",
"百度.jpg","d:/resource/images/diaodiao/country/");
}catch (Exception e) {
// TODO: handle exception
}
}
很多简单的接口就是直接一个URl的形式，
怎么调用？
HttpClient httpclient=null;
PostMethod post=null;
try{
httpclient = new HttpClient();
post = new PostMethod(SendUrl);
//设置编码方式
post.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET,"gbk");
//添加参数
post.addParameter("LoginName",LoginName);
post.addParameter("Password", Password);
//执行
httpclient.executeMethod(post);
//接口返回信息
String info = new String(post.getResponseBody(),CHARSET);
System.out.println(info);
}catch (Exception e) {
e.printStackTrace();
}finally {
//关闭连接，释放资源
post.releaseConnection();
((SimpleHttpConnectionManager)httpclient.getHttpConnectionManager()).shutdown();
}
到此为止，主要为自己做备忘，同时方便有需要的人。呵呵！