java网络工具类

    public static String sendGet(String url, String ecoding) {
        StringBuilder buffer = new StringBuilder();
        BufferedReader bufferedReader = null;
        InputStreamReader inputStreamReader = null;
        InputStream inputStream = null;
        HttpURLConnection httpUrlConn = null;
try {
            URL req_url = new URL(url);
            httpUrlConn = (HttpURLConnection) req_url.openConnection();
            httpUrlConn.setDoOutput(true);
            httpUrlConn.setDoInput(true);
            httpUrlConn.setUseCaches(false);
            httpUrlConn.setConnectTimeout(10000);
            httpUrlConn.setReadTimeout(10000);
            httpUrlConn.setRequestMethod("GET");
// httpUrlConn.setRequestProperty("Accept", "image/png,image/*;q=0.8,*/*;q=0.5");
// httpUrlConn.setRequestProperty("Accept-Encoding", "gzip");
//httpUrlConn.setRequestProperty("Referer", "http://www.hao123.com/");
            httpUrlConn.connect();  //发送请求
if (httpUrlConn.getResponseCode() == 200) {
// 将返回的输入流转换成字符串
                inputStream = httpUrlConn.getInputStream();
                inputStreamReader = new InputStreamReader(inputStream, ecoding);
                bufferedReader = new BufferedReader(inputStreamReader);
                String str;
while ((str = bufferedReader.readLine()) != null) {
                    buffer.append(str);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
try {
if (bufferedReader != null) {
                    bufferedReader.close();
                }
if (inputStreamReader != null) {
                    inputStreamReader.close();
                }
if (inputStream != null) {
                    inputStream.close();
                }
if (httpUrlConn != null) {
                    httpUrlConn.disconnect();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
return buffer.toString();
    }

public static byte[] download(String url) throws IOException {
        HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
        InputStream is = conn.getInputStream();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
if (conn.getResponseCode() == 200) {
byte[] buffer = new byte[8 * 1024];
int len;
int totalLen = conn.getContentLength();
int curLen = 0;
while ((len = is.read(buffer)) != -1) {
                baos.write(buffer, 0, len);
                curLen += len;
int p = curLen * 100 / totalLen;
                System.out.println("下载进度" + p + "%");
            }
is.close();
            conn.disconnect();
        }
return baos.toByteArray();
    }

public static void saveFile(byte[] bytes, String filePath, String fileName) {
        BufferedOutputStream bos = null;
        FileOutputStream fos = null;
        File file;
try {
            File dir = new File(filePath);
if (!dir.exists() && dir.isDirectory()) {//判断文件目录是否存在
                dir.mkdirs();
            }
            file = new File(filePath + "\\" + fileName);
            fos = new FileOutputStream(file);
            bos = new BufferedOutputStream(fos);
            bos.write(bytes);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
if (bos != null) {
try {
                    bos.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
if (fos != null) {
try {
                    fos.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }
    }