RestTemplate请求基本使用

POST：

        RestTemplate restTemplate = new RestTemplate();
        StringBuffer url= new StringBuffer(LiveGoodsUtils.ADD);
        url.append(WeixinInfoUtils.accessToken);
        //请求头
        HttpHeaders httpHeaders = new HttpHeaders();
        //定义请求参数类型，这里用json所以是MediaType.APPLICATION_JSON_UTF8
        httpHeaders.setContentType(MediaType.APPLICATION_JSON_UTF8);
        //RestTemplate带参传的时候要用HttpEntity对象传递--请求发起的参数
        HttpEntity request = new HttpEntity(obj, headers);
        //发送请求
        ResponseEntity entity = restTemplate.postForEntity(url.toString(), request, String.class);
        //获取3方接口返回的数据通过entity.getBody();它返回的是一个字符串；
        String body = entity.getBody();
        System.out.println("body:"+body);
        AddResponseVo parseObject = JSON.parseObject(body, AddResponseVo.class);
        System.err.println("result:"+parseObject);

GET:

public GetApprovedResponseVo getapproved(GetApprovedRequestVo obj) {
        RestTemplate restTemplate = new RestTemplate(); 
        StringBuffer url= new StringBuffer(LiveGoodsUtils.ADD_GOODS);
        url.append(WeixinInfoUtils.accessToken);
        //定义请求参数类型，这里用json所以是MediaType.APPLICATION_JSON_UTF8
        HttpHeaders headers = HttpHeadersUtils.getHeadersInstance();
        //RestTemplate带参传的时候要用HttpEntity对象传递
        HttpEntity request = new HttpEntity(obj, headers);
        //这里指定请求类型，HttpMethod.GET，也可修改参数改成POST
        ResponseEntity exchange = restTemplate.exchange(url.toString(), HttpMethod.GET, request, GetApprovedResponseVo.class);
        GetApprovedResponseVo body = exchange.getBody();
        return body;
    }

配置使用HTTPS：

public class HttpsClientRequestFactory extends SimpleClientHttpRequestFactory {

    @Override
    protected void prepareConnection(HttpURLConnection connection, String httpMethod) {
        try {
            if (!(connection instanceof HttpsURLConnection)) {
                throw new RuntimeException("An instance of HttpsURLConnection is expected");
            }

            HttpsURLConnection httpsConnection = (HttpsURLConnection) connection;

            TrustManager[] trustAllCerts = new TrustManager[]{
                    new X509TrustManager() {
                        @Override
                        public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                            return null;
                        }
                        @Override
                        public void checkClientTrusted(X509Certificate[] certs, String authType) {
                        }
                        @Override
                        public void checkServerTrusted(X509Certificate[] certs, String authType) {
                        }

                    }
            };
            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(null, trustAllCerts, new java.security.SecureRandom());
            httpsConnection.setSSLSocketFactory(new MyCustomSSLSocketFactory(sslContext.getSocketFactory()));

            httpsConnection.setHostnameVerifier(new HostnameVerifier() {
                @Override
                public boolean verify(String s, SSLSession sslSession) {
                    return true;
                }
            });

            super.prepareConnection(httpsConnection, httpMethod);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * We need to invoke sslSocket.setEnabledProtocols(new String[] {"SSLv3"});
     * see http://www.oracle.com/technetwork/java/javase/documentation/cve-2014-3566-2342133.html (Java 8 section)
     */
    // SSLSocketFactory用于创建 SSLSockets
    private static class MyCustomSSLSocketFactory extends SSLSocketFactory {

        private final SSLSocketFactory delegate;

        public MyCustomSSLSocketFactory(SSLSocketFactory delegate) {
            this.delegate = delegate;
        }

        // 返回默认启用的密码套件。除非一个列表启用，对SSL连接的握手会使用这些密码套件。
        // 这些默认的服务的最低质量要求保密保护和服务器身份验证
        @Override
        public String[] getDefaultCipherSuites() {
            return delegate.getDefaultCipherSuites();
        }

        // 返回的密码套件可用于SSL连接启用的名字
        @Override
        public String[] getSupportedCipherSuites() {
            return delegate.getSupportedCipherSuites();
        }


        @Override
        public Socket createSocket(final Socket socket, final String host, final int port,
                                   final boolean autoClose) throws IOException {
            final Socket underlyingSocket = delegate.createSocket(socket, host, port, autoClose);
            return overrideProtocol(underlyingSocket);
        }


        @Override
        public Socket createSocket(final String host, final int port) throws IOException {
            final Socket underlyingSocket = delegate.createSocket(host, port);
            return overrideProtocol(underlyingSocket);
        }

        @Override
        public Socket createSocket(final String host, final int port, final InetAddress localAddress,
                                   final int localPort) throws
                IOException {
            final Socket underlyingSocket = delegate.createSocket(host, port, localAddress, localPort);
            return overrideProtocol(underlyingSocket);
        }

        @Override
        public Socket createSocket(final InetAddress host, final int port) throws IOException {
            final Socket underlyingSocket = delegate.createSocket(host, port);
            return overrideProtocol(underlyingSocket);
        }

        @Override
        public Socket createSocket(final InetAddress host, final int port, final InetAddress localAddress,
                                   final int localPort) throws
                IOException {
            final Socket underlyingSocket = delegate.createSocket(host, port, localAddress, localPort);
            return overrideProtocol(underlyingSocket);
        }

        private Socket overrideProtocol(final Socket socket) {
            if (!(socket instanceof SSLSocket)) {
                throw new RuntimeException("An instance of SSLSocket is expected");
            }
            ((SSLSocket) socket).setEnabledProtocols(new String[]{"TLSv1"});
            return socket;
        }
    }

}

import org.springframework.web.client.RestTemplate;

public class RestTemplateHttpsFactory {

    private volatile static RestTemplate restTemplate;

    private RestTemplateHttpsFactory(RestTemplate restTemplate) {
        this.restTemplate = restTemplate;
    }

    public static RestTemplate getRestTemplateInstance(){
        if(null==restTemplate){
            synchronized (RestTemplateHttpsFactory.class){
                if(null==restTemplate){
                    HttpsClientRequestFactory httpsClientRequestFactory = new HttpsClientRequestFactory();
                    httpsClientRequestFactory.setConnectTimeout(5000);
                    httpsClientRequestFactory.setReadTimeout(5000);
                    restTemplate = new RestTemplate(httpsClientRequestFactory);
                }
            }
        }
        return restTemplate;
    }

}

发图携带图片请求： 

@Override
    public UploadResponseVo upload(UploadRequestVo obj) {
        StringBuffer httpMethod = new StringBuffer(MediaUploadUtils.url);
        httpMethod.append(obj.getAccessToken())
                .append("&type=").append(obj.getType());
        RestTemplate restTemplate = RestTemplateHttpsFactory.getRestTemplateInstance();
        //String args = "";

        MultiValueMap paramMap = new LinkedMultiValueMap<>();
        /*paramMap.add("args", args);
        paramMap.add("sign", "");*/

        //File file=new File(filePath);
        File file=obj.getFile();
        String suffix = file.getName().substring(file.getName().lastIndexOf("."));
        String name = UUID.randomUUID().toString().replace("-","");
        String fileName = name+suffix;
        byte[] bytesArray = new byte[(int) file.length()];
        try {
            FileInputStream fis = new FileInputStream(file);
            fis.read(bytesArray); //read file into bytes[]
            fis.close();
        }catch (Exception e){
            e.printStackTrace();
        }

        ByteArrayResource contentsAsResource = new ByteArrayResource(bytesArray) {
            @Override
            public String getFilename() {
                return fileName;
            }
        };
        paramMap.add("media", contentsAsResource);
        String result = restTemplate.postForObject(httpMethod.toString(), paramMap, String.class);
        System.out.println("post json : " + result);
        UploadResponseVo resultObj = JSON.parseObject(result, UploadResponseVo.class);
        return resultObj;
    }

    public static void main(String[] args) {
        UploadRequestVo obj = new UploadRequestVo();
        obj.setAccessToken(WeixinInfoUtils.accessToken);
        obj.setType("image");
        File file=new File("D:/img/testUpload.jpg");
        obj.setFile(file);
        MediaUploadServiceImpl mediaUploadService = new MediaUploadServiceImpl();
        mediaUploadService.upload(obj);
    }