廢話不多說了，直接給大家貼代碼了，具體代碼如下所示：
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package wxapi.WxHelper; import java.io.BufferedReader; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLConnection; import java.util.Date; import java.util.Map; import java.util.Map.Entry; public class HttpRequestUtil { /** * 發(fā)送get請求 * * @param requestUrl * 請求url * @param requestHeader * 請求頭 * @param responseEncoding * 響應編碼 * @return 頁面響應html */ public static String sendGet(String requestUrl, Map<String, String> requestHeader, String responseEncoding) { String result = ""; BufferedReader reader = null; try { if (requestUrl == null || requestUrl.isEmpty()) { return result; } URL realUrl = new URL(requestUrl); URLConnection connection = realUrl.openConnection(); connection.setRequestProperty("accept", "text/html, application/xhtml+xml, image/jxr, */*"); connection.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0"); if (requestHeader != null && requestHeader.size() > 0) { for (Entry<String, String> entry : requestHeader.entrySet()) { connection.setRequestProperty(entry.getKey(), entry.getValue()); } } connection.connect(); if (responseEncoding == null || responseEncoding.isEmpty()) { responseEncoding = "UTF-8"; } reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), responseEncoding)); String line; while ((line = reader.readLine()) != null) { result += line; } } catch (Exception e) { System.out.println("發(fā)送GET請求出現(xiàn)異常！"); e.printStackTrace(); } finally { try { if (reader != null) { reader.close(); } } catch (Exception e) { e.printStackTrace(); } } return result; } /** * 發(fā)送post請求 * * @param requestUrl * 請求url * @param requestHeader * 請求頭 * @param formTexts * 表單數(shù)據(jù) * @param files * 上傳文件 * @param requestEncoding * 請求編碼 * @param responseEncoding * 響應編碼 * @return 頁面響應html */ public static String sendPost(String requestUrl, Map<String, String> requestHeader, Map<String, String> formTexts, Map<String, String> files, String requestEncoding, String responseEncoding) { OutputStream out = null; BufferedReader reader = null; String result = ""; try { if (requestUrl == null || requestUrl.isEmpty()) { return result; } URL realUrl = new URL(requestUrl); HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection(); connection.setRequestProperty("accept", "text/html, application/xhtml+xml, image/jxr, */*"); connection.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0"); if (requestHeader != null && requestHeader.size() > 0) { for (Entry<String, String> entry : requestHeader.entrySet()) { connection.setRequestProperty(entry.getKey(), entry.getValue()); } } connection.setDoOutput(true); connection.setDoInput(true); connection.setRequestMethod("POST"); if (requestEncoding == null || requestEncoding.isEmpty()) { requestEncoding = "UTF-8"; } if (responseEncoding == null || responseEncoding.isEmpty()) { responseEncoding = "UTF-8"; } if (requestHeader != null && requestHeader.size() > 0) { for (Entry<String, String> entry : requestHeader.entrySet()) { connection.setRequestProperty(entry.getKey(), entry.getValue()); } } if (files == null || files.size() == 0) { connection.setRequestProperty("content-type", "application/x-www-form-urlencoded"); out = new DataOutputStream(connection.getOutputStream()); if (formTexts != null && formTexts.size() > 0) { String formData = ""; for (Entry<String, String> entry : formTexts.entrySet()) { formData += entry.getKey() + "=" + entry.getValue() + "&"; } formData = formData.substring(0, formData.length() - 1); out.write(formData.toString().getBytes(requestEncoding)); } } else { String boundary = "-----------------------------" + String.valueOf(new Date().getTime()); connection.setRequestProperty("content-type", "multipart/form-data; boundary=" + boundary); out = new DataOutputStream(connection.getOutputStream()); if (formTexts != null && formTexts.size() > 0) { StringBuilder sbFormData = new StringBuilder(); for (Entry<String, String> entry : formTexts.entrySet()) { sbFormData.append("--" + boundary + "\r\n"); sbFormData.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"\r\n\r\n"); sbFormData.append(entry.getValue() + "\r\n"); } out.write(sbFormData.toString().getBytes(requestEncoding)); } for (Entry<String, String> entry : files.entrySet()) { String fileName = entry.getKey(); String filePath = entry.getValue(); if (fileName == null || fileName.isEmpty() || filePath == null || filePath.isEmpty()) { continue; } File file = new File(filePath); if (!file.exists()) { continue; } out.write(("--" + boundary + "\r\n").getBytes(requestEncoding)); out.write(("Content-Disposition: form-data; name=\"" + fileName + "\"; filename=\"" + file.getName() + "\"\r\n").getBytes(requestEncoding)); out.write(("Content-Type: application/x-msdownload\r\n\r\n").getBytes(requestEncoding)); DataInputStream in = new DataInputStream(new FileInputStream(file)); int bytes = 0; byte[] bufferOut = new byte[1024]; while ((bytes = in.read(bufferOut)) != -1) { out.write(bufferOut, 0, bytes); } in.close(); out.write(("\r\n").getBytes(requestEncoding)); } out.write(("--" + boundary + "--").getBytes(requestEncoding)); } out.flush(); out.close(); out = null; reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), responseEncoding)); String line; while ((line = reader.readLine()) != null) { result += line; } } catch (Exception e) { System.out.println("發(fā)送POST請求出現(xiàn)異常！"); e.printStackTrace(); } finally { try { if (out != null) { out.close(); } if (reader != null) { reader.close(); } } catch (IOException ex) { ex.printStackTrace(); } } return result; } } |
以上所述是小編給大家介紹的Java 發(fā)送http請求上傳文件功能實例，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對服務器之家網(wǎng)站的支持！
原文鏈接：http://blog.csdn.net/xiaose_307/article/details/72887285
