这篇文章主要介绍了Java发送http get/post请求调用接口/方法，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面随着小编来一起学习学习吧
三个例子 ―JAVA发送http get/post请求，调用http接口、方法
例1：使用 HttpClient （commons-httpclient-3.0.jar
jar下载地址：http://xiazai.html.cn/201904/yuanma/commons-httpclient-3.0.rar
import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.methods.InputStreamRequestEntity; import org.apache.commons.httpclient.methods.PostMethod; import org.apache.commons.httpclient.methods.RequestEntity; public class HttpTool { /** * 发送post请求 * * @author Michael -----CSDN: http://blog.csdn.net/capmiachael * @param params * 参数 * @param requestUrl * 请求地址 * @param authorization * 授权书 * @return 返回结果 * @throws IOException */ public static String sendPost(String params, String requestUrl, String authorization) throws IOException { byte[] requestBytes = params.getBytes("utf-8"); // 将参数转为二进制流 HttpClient httpClient = new HttpClient();// 客户端实例化 PostMethod postMethod = new PostMethod(requestUrl); //设置请求头Authorization postMethod.setRequestHeader("Authorization", "Basic " + authorization); // 设置请求头 Content-Type postMethod.setRequestHeader("Content-Type", "application/json"); InputStream inputStream = new ByteArrayInputStream(requestBytes, 0, requestBytes.length); RequestEntity requestEntity = new InputStreamRequestEntity(inputStream, requestBytes.length, "application/json; charset=utf-8"); // 请求体 postMethod.setRequestEntity(requestEntity); httpClient.executeMethod(postMethod);// 执行请求 InputStream soapResponseStream = postMethod.getResponseBodyAsstream();// 获取返回的流 byte[] datas = null; try { datas = readInputStream(soapResponseStream);// 从输入流中读取数据 } catch (Exception e) { e.printstacktrace(); } String result = new String(datas, "UTF-8");// 将二进制流转为String // 打印返回结果 // System.out.println(result); return result; } /** * 从输入流中读取数据 * * @param inStream * @return * @throws Exception */ public static byte[] readInputStream(InputStream inStream) throws Exception { ByteArrayOutputStream outStream = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len = 0; while ((len = inStream.read(buffer)) != -1) { outStream.write(buffer, 0, len); } byte[] data = outStream.toByteArray(); outStream.close(); inStream.close(); return data; } }
例2：
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.UnsupportedEncodingException; import java.net.HttpURLConnection; import java.net.InetSocketAddress; import java.net.Proxy; import java.net.URL; import java.net.URLConnection; import java.util.List; import java.util.Map; /** * Http请求工具类 * @author sNowfigure * @since 2014-8-24 13:30:56 * @version v1.0.1 */ public class HttpRequestUtil { static boolean proxySet = false; static String proxyHost = "127.0.0.1"; static int proxyPort = 8087; /** * 编码 * @param source * @return */ public static String urlEncode(String source,String encode) { String result = source; try { result = java.net.URLEncoder.encode(source,encode); } catch (UnsupportedEncodingException e) { e.printstacktrace(); return "0"; } return result; } public static String urlEncodeGBK(String source) { String result = source; try { result = java.net.URLEncoder.encode(source,"GBK"); } catch (UnsupportedEncodingException e) { e.printstacktrace(); return "0"; } return result; } /** * 发起http请求获取返回结果 * @param req_url 请求地址 * @return */ public static String httpRequest(String req_url) { StringBuffer buffer = new StringBuffer(); try { URL url = new URL(req_url); HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection(); httpUrlConn.setDoOutput(false); httpUrlConn.setDoInput(true); httpUrlConn.setUseCaches(false); httpUrlConn.setRequestMethod("GET"); httpUrlConn.connect(); // 将返回的输入流转换成字符串 InputStream inputStream = httpUrlConn.getInputStream(); InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8"); BufferedReader bufferedReader = new BufferedReader(inputStreamReader); String str = null; while ((str = bufferedReader.readLine()) != null) { buffer.append(str); } bufferedReader.close(); inputStreamReader.close(); // 释放资源 inputStream.close(); inputStream = null; httpUrlConn.disconnect(); } catch (Exception e) { System.out.println(e.getStackTrace()); } return buffer.toString(); } /** * 发送http请求取得返回的输入流 * @param requestUrl 请求地址 * @return InputStream */ public static InputStream httpRequestIO(String requestUrl) { InputStream inputStream = null; try { URL url = new URL(requestUrl); HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection(); httpUrlConn.setDoInput(true); httpUrlConn.setRequestMethod("GET"); httpUrlConn.connect(); // 获得返回的输入流 inputStream = httpUrlConn.getInputStream(); } catch (Exception e) { e.printstacktrace(); } return inputStream; } /** * 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)"); // 建立实际的连接 connection.connect(); // 获取所有响应头字段 Map> 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) { System.out.println("发送GET请求出现异常！" + e); e.printstacktrace(); } // 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。 * @param isproxy * 是否使用代理模式 * @return 所代表远程资源的响应结果 */ public static String sendPost(String url, String param,boolean isproxy) { OutputStreamWriter out = null; BufferedReader in = null; String result = ""; try { URL realUrl = new URL(url); HttpURLConnection conn = null; if(isproxy){//使用代理模式 @SuppressWarnings("static-access") Proxy proxy = new Proxy(Proxy.Type.DIRECT.HTTP, new InetSocketAddress(proxyHost, proxyPort)); conn = (HttpURLConnection) realUrl.openConnection(proxy); }else{ conn = (HttpURLConnection) realUrl.openConnection(); } // 打开和URL之间的连接 // 发送POST请求必须设置如下两行 conn.setDoOutput(true); conn.setDoInput(true); conn.setRequestMethod("POST"); // POST方法 // 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.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); conn.connect(); // 获取URLConnection对象对应的输出流 out = new OutputStreamWriter(conn.getoutputStream(), "UTF-8"); // 发送请求参数 out.write(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) { System.out.println("发送 POST 请求出现异常！"+e); e.printstacktrace(); } //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; } public static void main(String[] args) { //demo:代理访问 String url = "http://api.adf.ly/api.PHP"; String para = "key=youkeyid&youuid=uid&advert_type=int&domain=adf.ly&url=http://somewebsite.com"; String sr=HttpRequestUtil.sendPost(url,para,true); System.out.println(sr); } }
例3
/** * 发送Http post请求 * * @param xmlInfo * json转化成的字符串 * @param URL * 请求url * @return 返回信息 */ public static String doHttpPost(String xmlInfo, String URL) { System.out.println("发起的数据:" + xmlInfo); byte[] xmlData = xmlInfo.getBytes(); InputStream instr = null; java.io.ByteArrayOutputStream out = null; try { URL url = new URL(URL); URLConnection urlCon = url.openConnection(); urlCon.setDoOutput(true); urlCon.setDoInput(true); urlCon.setUseCaches(false); urlCon.setRequestProperty("content-Type", "application/json"); urlCon.setRequestProperty("charset", "utf-8"); urlCon.setRequestProperty("Content-length", String.valueOf(xmlData.length)); System.out.println(String.valueOf(xmlData.length)); DataOutputStream printout = new DataOutputStream( urlCon.getoutputStream()); printout.write(xmlData); printout.flush(); printout.close(); instr = urlCon.getInputStream(); byte[] bis = IoUtils.toByteArray(instr); String ResponseString = new String(bis, "UTF-8"); if ((ResponseString == null) || ("".equals(ResponseString.trim()))) { System.out.println("返回空"); } System.out.println("返回数据为:" + ResponseString); return ResponseString; } catch (Exception e) { e.printstacktrace(); return "0"; } finally { try { out.close(); instr.close(); } catch (Exception ex) { return "0"; } } }
以上所述是小编给大家介绍的Java发送http get/post请求调用接口/方法详解整合，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对编程之家网站的支持！
