java发起http请求调用post与get接口的方法实例 java发起http请求调用post与get接

一、java调用post接口

1、使用URLConnection或者HttpURLConnection
2、使用CloseableHttpClient
3、使用HttpCaller

二、java调用get接口

总结

一、java调用post接口
1、使用URLConnection或者HttpURLConnection
java自带的，无需下载其他jar包
【java发起http请求调用post与get接口的方法实例】URLConnection方式调用，如果接口响应码被服务端修改则无法接收到返回报文，只能当响应码正确时才能接收到返回

public static String sendPost(String url, String param) {OutputStreamWriter out = null; BufferedReader in = null; StringBuilder result = new StringBuilder(""); 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("Content-Type","application/json; charset=UTF-8"); conn.setRequestProperty("accept", "*/*"); conn.setRequestProperty("connection", "Keep-Alive"); conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)"); // 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 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(),"UTF-8")); String line; while ((line = in.readLine()) != null) {result.append(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{if(out!=null){ try { out.close(); }catch(Exception ex){} }if(in!=null){ try { in.close(); }catch(Exception ex){} }}return result.toString(); }

HttpURLConnection方式调用

//ms超时毫秒,url地址,json入参public static String httpJson(int ms,String url,String json) throws Exception{String err = "00", line = null; StringBuilder sb = new StringBuilder(); HttpURLConnection conn = null; BufferedWriter out = null; BufferedReader in = null; try{conn = (HttpURLConnection) (new URL(url.replaceAll("／","/"))).openConnection(); conn.setRequestMethod("POST"); conn.setDoOutput(true); conn.setDoInput(true); conn.setUseCaches(false); conn.setConnectTimeout(ms); conn.setReadTimeout(ms); conn.setRequestProperty("Content-Type","application/json; charset=utf-8"); conn.connect(); out = new BufferedWriter(new OutputStreamWriter(conn.getOutputStream(),"utf-8")); out.write(new String(json.getBytes(), "utf-8")); out.flush(); //发送参数int code = conn.getResponseCode(); if (conn.getResponseCode()==200){in = new BufferedReader(new InputStreamReader(conn.getInputStream(),"UTF-8")); while ((line=in.readLine())!=null)sb.append(line); }//接收返回值}catch(Exception ex){err=ex.getMessage(); }try{ if (out!=null) out.close(); }catch(Exception ex){}; try{ if (in!=null) in.close(); }catch(Exception ex){}; try{ if (conn!=null) conn.disconnect(); }catch(Exception ex){}if (!err.equals("00")) throw new Exception(err); return sb.toString(); }

2、使用CloseableHttpClient
使用的jar包

com.alibaba.csb.sdkhttp-client1.1.5.1

public static String httpPostJson(String url,String json) throws Exception{String data=""; CloseableHttpClient httpClient = null; CloseableHttpResponse response = null; try {httpClient = HttpClients.createDefault(); HttpPost httppost = new HttpPost(url); httppost.setHeader("Content-Type", "application/json; charset=UTF-8"); StringEntity se = new StringEntity(json,Charset.forName("UTF-8")); se.setContentType("text/json"); se.setContentEncoding("UTF-8"); httppost.setEntity(se); response = httpClient.execute(httppost); int code = response.getStatusLine().getStatusCode(); System.out.println("接口响应码:"+code); data = https://www.it610.com/article/EntityUtils.toString(response.getEntity(),"utf-8"); EntityUtils.consume(response.getEntity()); } catch (Exception e) {e.printStackTrace(); } finally {if(response!=null){ try{response.close(); }catch (IOException e){} }if(httpClient!=null){ try{httpClient.close(); }catch(IOException e){} }}return data; }

3、使用HttpCaller
使用的jar包同第2个中的jar包。
详情可以查看阿里云总线CSB
https://help.aliyun.com/document_detail/148571.html

public static String sendPost(){String result = ""; HttpParameters.Builder builder = HttpParameters.newBuilder(); builder.requestURL("URL") // 设置请求的URL.api("api") // 设置服务名.version("version") // 设置版本号.method("post") // 设置调用方式, get/post.accessKey("ak").secretKey("sk"); // 设置accessKey 和设置secretKey// 设置请求参数（json格式)Map param = new HashMap(); param.put("key1","value1"); param.put("key2","value2"); //加密，没有加密则不需要encryptParam，直接用paramMap encryptParam = new HashMap(); encryptParam.put("key3", getData(JSON.toJSONString(param))); ContentBody cb = new ContentBody(JSON.toJSONString(encryptParam)); builder.contentBody(cb); try {result = HttpCaller.invoke(builder.build()); } catch (Exception e) {e.printStackTrace(); }return result; } //自己的加密方式 public static String getData(String data1){return "加密后的密文"; }

二、java调用get接口使用java自带的URLConnection

//将map型转为请求参数型public static String getUrlData(Map data) throws Exception{ StringBuffer sb = new StringBuffer(); try {Set> entries = data.entrySet(); Iterator> iterators = entries.iterator(); while(iterators.hasNext()){Map.Entry next = iterators.next(); sb.append(next.getKey().toString().trim()).append("=").append(URLEncoder.encode(next.getValue() + "", "UTF-8").trim()).append("&"); }sb.deleteCharAt(sb.length() - 1); } catch (Exception e) {sb.append(e.toString()); } return sb.toString(); }//strUrl截止到?，例：http://127.0.0.1:8080/api/method?public static String httpGet(String strUrl){ Map params = new HashMap(); params.put("key1", "value1"); params.put("key2", "value2"); String url=strUrl + getUrlData(params); StringBuilder result = new StringBuilder(); BufferedReader in = null; try {URL realUrl = new URL(url); // 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// 定义 BufferedReader输入流来读取URL的响应in = new BufferedReader(new InputStreamReader(connection.getInputStream(),"UTF-8")); String line; while ((line = in.readLine()) != null) {result.append(line); }} catch (Exception e) {System.out.println("发送GET请求出现异常！" + e); e.printStackTrace(); }finally {if (in != null){ try { in.close(); }catch(Exception e2){} }}return result.toString(); }

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