```java /** * @author xuwei * <p/> * created at 2015年10月26日 下午2:43:02 */ 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.io.PrintWriter; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLConnection; import java.util.Iterator; import java.util.List; import java.util.Map; public class BAHttpRequest { /** * 向指定URL发送GET方法的请求 * * @param url 发送请求的URL * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。 * @return URL 所代表远程资源的响应结果 */ public static String sendGet(String url, String param) { String result = ""; BufferedReader in = null; try { String urlNameString = url + "?" + param; URL realUrl = new URL(urlNameString); // 打开和URL之间的连接 URLConnection connection = realUrl.openConnection(); // 设置通用的请求属性 connection.setRequestProperty("accept", "*/*"); connection.setRequestProperty("connection", "Keep-Alive"); connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); connection.setConnectTimeout(5000); // 建立实际的连接 connection.connect(); // 获取所有响应头字段 Map<String, List<String>> map = connection.getHeaderFields(); // 遍历所有的响应头字段 for (String key : map.keySet()) { System.out.println(key + "--->" + map.get(key)); } // 定义 BufferedReader输入流来读取URL的响应 in = new BufferedReader(new InputStreamReader(connection.getInputStream())); String line; while ((line = in.readLine()) != null) { result += line; } } catch (Exception e) { //e.printStackTrace(); System.out.println("发送GET请求出现异常！" + e); } // 使用finally块来关闭输入流 finally { try { if (in != null) { in.close(); } } catch (Exception e2) { e2.printStackTrace(); } } return result; } /** * 向指定 URL 发送POST方法的请求 * * @param url 发送请求的 URL * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。 * @return 所代表远程资源的响应结果 */ public static String sendPost(String url, String param) { PrintWriter out = null; BufferedReader in = null; String result = ""; try { URL realUrl = new URL(url); // 打开和URL之间的连接 URLConnection conn = realUrl.openConnection(); // 设置通用的请求属性 conn.setRequestProperty("accept", "*/*"); conn.setRequestProperty("connection", "Keep-Alive"); conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); conn.setConnectTimeout(5000); // 发送POST请求必须设置如下两行 conn.setDoOutput(true); conn.setDoInput(true); // 获取URLConnection对象对应的输出流 out = new PrintWriter(conn.getOutputStream()); // 发送请求参数 out.print(param); // flush输出流的缓冲 out.flush(); // 定义BufferedReader输入流来读取URL的响应 in = new BufferedReader(new InputStreamReader(conn.getInputStream())); String line; while ((line = in.readLine()) != null) { result += line; } } catch (Exception e) { //e.printStackTrace(); System.out.println("发送 POST 请求出现异常！" + e); } // 使用finally块来关闭输出流、输入流 finally { try { if (out != null) { out.close(); } if (in != null) { in.close(); } } catch (IOException ex) { ex.printStackTrace(); } } return result; } /** * 上传图片 * * @param urlStr * @param textMap * @param fileMap * @return */ public static String formUpload(String urlStr, Map<String, String> textMap, Map<String, String> fileMap) { String res = ""; HttpURLConnection conn = null; String BOUNDARY = "---------------------------"; //boundary就是request头和上传文件内容的分隔符 try { URL url = new URL(urlStr); conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(5000); conn.setReadTimeout(30000); conn.setDoOutput(true); conn.setDoInput(true); conn.setUseCaches(false); conn.setRequestMethod("POST"); conn.setRequestProperty("Connection", "Keep-Alive"); conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY); OutputStream out = new DataOutputStream(conn.getOutputStream()); // text if (textMap != null) { StringBuffer strBuf = new StringBuffer(); Iterator<Map.Entry<String, String>> iter = textMap.entrySet().iterator(); while (iter.hasNext()) { Map.Entry<String, String> entry = iter.next(); String inputName = (String) entry.getKey(); String inputValue = (String) entry.getValue(); if (inputValue == null) { continue; } strBuf.append("\r\n").append("--").append(BOUNDARY).append("\r\n"); strBuf.append("Content-Disposition: form-data; name=\"" + inputName + "\"\r\n\r\n"); strBuf.append(inputValue); } out.write(strBuf.toString().getBytes()); } // file if (fileMap != null) { Iterator<Map.Entry<String, String>> iter = fileMap.entrySet().iterator(); while (iter.hasNext()) { Map.Entry<String, String> entry = iter.next(); String inputName = entry.getKey(); String inputValue = entry.getValue(); if (inputValue == null) { continue; } File file = new File(inputValue); String filename = file.getName(); StringBuffer strBuf = new StringBuffer(); strBuf.append("\r\n").append("--").append(BOUNDARY).append("\r\n"); strBuf.append("Content-Disposition: form-data; name=\"" + inputName + "\"; filename=\"" + filename + "\"\r\n"); strBuf.append("Content-Type:image/png\r\n\r\n"); out.write(strBuf.toString().getBytes()); 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(); } } byte[] endData = ("\r\n--" + BOUNDARY + "--\r\n").getBytes(); out.write(endData); out.flush(); out.close(); // 读取返回数据 StringBuffer strBuf = new StringBuffer(); BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream())); String line = null; while ((line = reader.readLine()) != null) { strBuf.append(line).append("\n"); } res = strBuf.toString(); reader.close(); reader = null; } catch (Exception e) { //e.printStackTrace(); System.out.println("发送POST请求出错。" + urlStr); } finally { if (conn != null) { conn.disconnect(); conn = null; } } return res; } } ```