OkHttpClient 常见用法

本文详细介绍了如何在OkHttpClient中发送GET和POST请求,以及如何通过getUnsafeOkHttpClient方法跳过证书认证,但强调了这种做法会降低安全性,需谨慎使用。

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发送get请求

public static String get(OkHttpClient client, String url) {
        if (url.equals("https")) client = getUnsafeOkHttpClient();
        Request request  = new Request.Builder()
                    .url(url)
                    .build();  
        Response response = null;
        try {
            logger.info(String.format("发送get请求, 请求的url为[%s]", url));
            response = client.newCall(request).execute();
            String respStr = response.body().string(); 
            return respStr;
        } catch (Exception e) {
            String.format("发送get请求出现异常!请求的url为[%s], 异常信息为: %s", url, ThrowableUtil.getErrorTrace(e));
        }
        return null;
    }

post请求

public static String postForm(OkHttpClient client, String url, Map<String, String> params) {
        FormBody.Builder builder = new FormBody.Builder();
        params.forEach((k, v) -> {
            builder.add(k, v);
        });

        // 创建一个Headers.Builder来构建请求头
        Headers.Builder headers = new Headers.Builder();
        headers.add("Content-Type", "application/json"); // 添加一个Content-Type头

        Request request = new Request.Builder()
                .url(url)
                .post(builder.build())
                .headers(headers.build())
                .build();
        Response response = null;
        try { 
            response = client.newCall(request).execute();
            String respStr = response.body().string(); 
            return respStr;
        } catch (Exception e) {
           String.format(String.format("发送post请求出现异常!请求的url为[%s], 发送的数据为[%s], 异常信息为: %s", url, params.toString(), ThrowableUtil.getErrorTrace(e)));
        }
        return null;
    }

跳过证书认证

ublic static OkHttpClient getUnsafeOkHttpClient() {
        try {
            // 创建一个信任所有证书的TrustManager
            final TrustManager[] trustAllCerts = new TrustManager[]{
                    new X509TrustManager() {
                        @Override
                        public void checkClientTrusted(X509Certificate[] chain, String authType) {
                        }

                        @Override
                        public void checkServerTrusted(X509Certificate[] chain, String authType) {
                        }

                        @Override
                        public X509Certificate[] getAcceptedIssuers() {
                            return new X509Certificate[]{};
                        }
                    }
            };

            // 初始化SSLContext并设置TrustManager
            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(null, trustAllCerts, new SecureRandom());
            // 创建一个SSLSocketFactory
            final SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();

            // 配置OkHttpClient使用自定义的SSLSocketFactory
            OkHttpClient okHttpClient = new OkHttpClient.Builder()
                    .sslSocketFactory(sslSocketFactory, (X509TrustManager) trustAllCerts[0])
                    .hostnameVerifier(new HostnameVerifier() {
                        @Override
                        public boolean verify(String hostname, SSLSession session) {
                            return true; // 不验证主机名
                        }
                    })
                    .build();

            return okHttpClient;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

使用时直接调用
OkHttpClient client = OkHttpUtils.getUnsafeOkHttpClient();

注意HostnameVerifier和X509TrustManager都配置为信任所有内容,这会导致安全性降低,容易受到中间人攻击,请谨慎使用

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