抓取服务器图片下载到本地
Sample code：
import org.apache.http.Header;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
public void download(String path, String url) {
// String url = "xxxxxxxx";
// String path = "F:/test.jpg";
HttpClient client = null;
try {
// 创建HttpClient对象
client = new DefaultHttpClient();
// 获得HttpGet对象
HttpGet httpGet = getHttpGet(url, null, null);
// 发送请求获得返回结果
HttpResponse response = client.execute(httpGet);
// 如果成功
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
byte[] result = EntityUtils.toByteArray(response.getEntity());
BufferedOutputStream bw = null;
try {
// 创建文件对象
File f = new File(path);
// 创建文件路径
if (!f.getParentFile().exists())
f.getParentFile().mkdirs();
// 写入文件
bw = new BufferedOutputStream(new FileOutputStream(path));
bw.write(result);
} catch (Exception e) {
log.error("保存文件错误,path=" + path + ",url=" + url, e);
} finally {
try {
if (bw != null)
bw.close();
} catch (Exception e) {
log.error(
"finally BufferedOutputStream shutdown close",
e);
}
}
}
// 如果失败
else {
StringBuffer errorMsg = new StringBuffer();
errorMsg.append("httpStatus:");
errorMsg.append(response.getStatusLine().getStatusCode());
errorMsg.append(response.getStatusLine().getReasonPhrase());
errorMsg.append(", Header: ");
Header[] headers = response.getAllHeaders();
for (Header header : headers) {
errorMsg.append(header.getName());
errorMsg.append(":");
errorMsg.append(header.getValue());
}
log.error("HttpResonse Error:" + errorMsg);
}
} catch (ClientProtocolException e) {
log.error("下载文件保存到本地,http连接异常,path=" + path + ",url=" + url, e);
} catch (IOException e) {
log.error("下载文件保存到本地,文件操作异常,path=" + path + ",url=" + url, e);
} finally {
try {
client.getConnectionManager().shutdown();
} catch (Exception e) {
log.error("finally HttpClient shutdown error", e);
}
}
}
private static HttpGet getHttpGet(String url, Map<String, String> params,
String encode) {
StringBuffer buf = new StringBuffer(url);
if (params != null) {
// 地址增加?或者&
String flag = (url.indexOf('?') == -1) ? "?" : "&";
// 添加参数
for (String name : params.keySet()) {
buf.append(flag);
buf.append(name);
buf.append("=");
try {
String param = params.get(name);
if (param == null) {
param = "";
}
buf.append(URLEncoder.encode(param, encode));
} catch (UnsupportedEncodingException e) {
log.error("URLEncoder Error,encode=" + encode + ",param="
+ params.get(name), e);
}
flag = "&";
}
}
HttpGet httpGet = new HttpGet(buf.toString());
return httpGet;
}