Bagaimanakah java memulakan permintaan http dan memanggil siaran dan mendapatkan antara muka?

1 Java memanggil antara muka siaran

1 Gunakan URLConnection atau HttpURLConnection

java disertakan dengannya, tidak perlu memuat turun yang lain. jar packages

Panggilan kaedah sambungan URL, jika kod respons antara muka diubah suai oleh pelayan, mesej pulangan tidak boleh diterima, dan mesej balasan hanya boleh diterima apabila kod respons betul

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();
    }

Panggilan kaedah HttpURLConnection

//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. Gunakan CloseableHttpClient

Pakej balang yang digunakan

<dependency>
    <groupId>com.alibaba.csb.sdk</groupId>
    <artifactId>http-client</artifactId>
    <version>1.1.5.1</version>
</dependency>

rrree

3 bungkusan balang dalam yang kedua.

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 = 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;
	}

2 Java memanggil antara muka get

Gunakan URLConnection yang disertakan dengan java

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<String,String> param = new HashMap<String,String>();
        param.put("key1","value1");
        param.put("key2","value2");
        //加密，没有加密则不需要encryptParam，直接用param
        Map<String,String> encryptParam = new HashMap<String,String>();
        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";
	}

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