client.HttpURLConnectionClient.java

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package client;
 
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Map;
import java.util.Map.Entry;
 
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
 
import org.apache.log4j.Logger;
 
public class HttpURLConnectionClient {
    private final String POST="POST";
    private final String GET="GET";
    private final String UTF_8 = "UTF-8";
     
    private static HttpURLConnectionClient httpURLConnectionClient = new HttpURLConnectionClient();
     
    private HttpURLConnectionClient(){}
     
    public static HttpURLConnectionClient getInstance(){
        return httpURLConnectionClient;
    }
     
    private Logger logger = Logger.getLogger(this.getClass());
     
    public String get(String requestUrl) {
        StringBuffer buffer = new StringBuffer();
        BufferedReader bufferedReader = null;
        OutputStream outputStream = null;
        HttpURLConnection httpUrlConn = null;
 
        try {
            httpUrlConn = createHttpURLConnection(requestUrl);
            httpUrlConn.setRequestMethod(GET);
            // 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 = new BufferedReader(inputStreamReader);
            String str = null;
            while ((str = bufferedReader.readLine()) != null) {
                buffer.append(str);
            }
            return buffer.toString();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }finally {
            close(bufferedReader,outputStream,httpUrlConn);
        }
    }
     
     
    public String post(String requestUrl,Map<String,String> headers, String data) {
        StringBuffer buffer = new StringBuffer();
        BufferedReader bufferedReader = null;
        OutputStream outputStream = null;
        HttpURLConnection httpUrlConn = null;
 
        try {
            httpUrlConn = createHttpURLConnection(requestUrl);
            httpUrlConn.setRequestMethod(POST);
            addHeaders(httpUrlConn,headers);
            // 当有数据需要提交时
            if (null != data) {
                outputStream = httpUrlConn.getOutputStream();
                // 注意编码格式，防止中文乱码
                outputStream.write(data.getBytes("UTF-8"));
                outputStream.flush();
            }
 
            // 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 = new BufferedReader(inputStreamReader);
 
            String str = null;
            while ((str = bufferedReader.readLine()) != null) {
                buffer.append(str);
            }
            return buffer.toString();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }finally {
            close(bufferedReader,outputStream,httpUrlConn);
        }
    }
     
    public String httpsGet(String requestUrl) {
        StringBuffer buffer = new StringBuffer();
 
        BufferedReader bufferedReader = null;
        OutputStream outputStream = null;
        HttpsURLConnection httpUrlConn = null;
 
        try {
            // 创建SSLContext对象，并使用我们指定的信任管理器初始化
            TrustManager[] tm = { new NonAuthenticationX509TrustManager() };
            SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
            sslContext.init(null, tm, new java.security.SecureRandom());
            // 从上述SSLContext对象中得到SSLSocketFactory对象
            SSLSocketFactory ssf = sslContext.getSocketFactory();
                 
            httpUrlConn = (HttpsURLConnection) createHttpURLConnection(requestUrl);
            httpUrlConn.setSSLSocketFactory(ssf);
            httpUrlConn.setRequestMethod(GET);
 
            // 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 = new BufferedReader(inputStreamReader);
 
            String str = null;
            while ((str = bufferedReader.readLine()) != null) {
                buffer.append(str);
            }
            return buffer.toString();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }finally {
            close(bufferedReader,outputStream,httpUrlConn);
        }
    }
     
    public String httpsPost(String requestUrl, Map<String,String> headers,String data) {
        StringBuffer buffer = new StringBuffer();
 
        BufferedReader bufferedReader = null;
        OutputStream outputStream = null;
        HttpsURLConnection httpUrlConn = null;
 
        try {
            // 创建SSLContext对象，并使用我们指定的信任管理器初始化
            TrustManager[] tm = { new NonAuthenticationX509TrustManager() };
            SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
            sslContext.init(null, tm, new java.security.SecureRandom());
            // 从上述SSLContext对象中得到SSLSocketFactory对象
            SSLSocketFactory ssf = sslContext.getSocketFactory();
 
            httpUrlConn = (HttpsURLConnection) createHttpURLConnection(requestUrl);
            httpUrlConn.setSSLSocketFactory(ssf);
            httpUrlConn.setRequestMethod(POST);
            addHeaders(httpUrlConn,headers);
            // 当有数据需要提交时
            if (null != data) {
                outputStream = httpUrlConn.getOutputStream();
                // 注意编码格式，防止中文乱码
                outputStream.write(data.getBytes(UTF_8));
                outputStream.flush();
            }
 
            // 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 = new BufferedReader(inputStreamReader);
 
            String str = null;
            while ((str = bufferedReader.readLine()) != null) {
                buffer.append(str);
            }
            return buffer.toString();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }finally {
            close(bufferedReader,outputStream,httpUrlConn);
        }
    }
     
    /* ================================================== private methods ================================================== */
    private void addHeaders(HttpURLConnection httpURLConnection,Map<String,String> headers){
        if(headers==null){
            return;
        }
        for(Entry<String,String> header:headers.entrySet()){
            String key = header.getKey();
            String value = header.getValue();
            httpURLConnection.addRequestProperty(key, value);
        }
    }
     
     
    private HttpURLConnection createHttpURLConnection(String requestUrl){
        URL url = null;
        HttpURLConnection httpUrlConn = null;
        try {
            url = new URL(requestUrl);
            httpUrlConn = (HttpURLConnection) url.openConnection();
        } catch (Throwable e) {
            throw new RuntimeException(e);
        }
        httpUrlConn.setDoOutput(true);
        httpUrlConn.setDoInput(true);
        httpUrlConn.setUseCaches(false);
        return httpUrlConn;
    }
     
    private void close(BufferedReader bufferedReader,
                       OutputStream outputStream, 
                       HttpURLConnection httpUrlConn) {
        if(outputStream!=null){
            try{
                outputStream.close();
            }catch(Throwable e){
                logger.error("关闭流失败!",e);
            }
        }
        if(bufferedReader!=null){
            try{
                bufferedReader.close();
            }catch(Throwable e){
                logger.error("关闭流失败!",e);
            }
        }
        if(httpUrlConn!=null){
            try{
                httpUrlConn.disconnect();
            }catch(Throwable e){
                logger.error("关闭连接失败!",e);
            }
        }
    }
}

client.NonAuthenticationX509TrustManager.java

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package client;
 
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
 
import javax.net.ssl.X509TrustManager;
 
class NonAuthenticationX509TrustManager implements X509TrustManager {
    @Override
    public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
    }
 
    @Override
    public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
    }
 
    @Override
    public X509Certificate[] getAcceptedIssuers() {
        return new X509Certificate[0];
    }
}