Java HttpClient

 
public class WebClient {
    
    public static final String POST_TYPE_JSON = "json";
    public static final String POST_TYPE_MULTI = "multi";
    public static final String POST_TYPE_NAME_VALUE = "name_value";
    private static final Pattern pageEncodingReg = Pattern.compile("content-type.*charset=([^">\\]+)", Pattern.CASE_INSENSITIVE);
    private static final Pattern headerEncodingReg = Pattern.compile("charset=(.+)", Pattern.CASE_INSENSITIVE);
   
    private DefaultHttpClient httpClient = new DefaultHttpClient();
    private String url;
    private HTTPMethod method;
    private Response response;
    private Map<String, String> headers = new HashMap<String, String>();
    private JSONObject parameters = new JSONObject();
    private List<FormBodyPart> multipartParameter = new ArrayList<FormBodyPart>();
    private String postType;
    
    private static final String UTF8 = "utf-8";

    public void setMethod(HTTPMethod method) {
        this.method = method;
    }
 
    public void setUrl(String url) {
        if (isStringEmpty(url)) {
            throw new RuntimeException("[Error] url is empty!");
        }
        this.url = url;
        headers.clear();
        parameters.clear();
        multipartParameter.clear();
        postType = null;
        response = null;
        
        if (url.startsWith("https://")) {
            enableSSL();
        } else {
            disableSSL();
        }
    }
 
    public Map<String, String> getRequestHeaders() {
        return headers;
    }
    
    public void setRequestHeaders(String key, String value){
        headers.put(key, value);
    }
 
    public void addParameter(String name, Object value){
        parameters.put(name, value);
    }
    
    public void setParameters(JSONObject json){
        parameters.clear();
        parameters.putAll(json);
    }
    
    public void setAjaxHeaders(){
        setRequestHeaders("Content-Type", "application/json");
    }
 
    public void setTimeout(int connectTimeout, int readTimeout) {
        HttpParams params = httpClient.getParams();
        HttpConnectionParams.setConnectionTimeout(params, connectTimeout);
        HttpConnectionParams.setSoTimeout(params, readTimeout);
    }
 
    
 
    public Response sendRequest() throws IOException {
        if (url == null || method == null) {
            throw new RuntimeException("Request exception: URL or Method is null");
        }
        
        httpClient.getParams().setParameter(ClientPNames.COOKIE_POLICY, CookiePolicy.BROWSER_COMPATIBILITY);
        HttpResponse resp = null;
        HttpUriRequest req = null;
        
        
        if (method.equals(HTTPMethod.GET)) {
            req = new HttpGet(url);
        }
        else if(method.equals(HTTPMethod.DELETE)){
            req = new HttpDelete(url);
        }
        else if(method.equals(HTTPMethod.PUT)){
            req = new HttpPut(url);
            if(parameters.size() > 0){
                StringEntity entity = new StringEntity(new String(parameters.toString().getBytes("utf-8"), "ISO-8859-1"));
                entity.setContentEncoding("UTF-8");
                entity.setContentType("application/json");
                ((HttpPut) req).setEntity(entity);
            }
        }
        else {
            req = new HttpPost(url);
           
            if(POST_TYPE_MULTI.equals(postType)  ){
                MultipartEntity entity = new MultipartEntity();
                for(FormBodyPart bodyPart : multipartParameter){
                    entity.addPart(bodyPart);
                }
                ((HttpPost) req).setEntity(entity);
            }
            else  if(parameters.size() > 0){
                if(POST_TYPE_JSON.equals(postType)){
                    StringEntity entity = new StringEntity(new String(parameters.toString().getBytes("utf-8"), "ISO-8859-1"));
                    entity.setContentEncoding("UTF-8");
                    entity.setContentType("application/json");
                    ((HttpPost) req).setEntity(entity);
                }
                else{
                    Iterator<String> iterator = parameters.keys();
                    List<NameValuePair> postParameter = new ArrayList<NameValuePair>();
                    while(iterator.hasNext()){
                        String key = iterator.next();
                        postParameter.add(new BasicNameValuePair(key, parameters.getString(key)));
                    }
                    ((HttpPost) req).setEntity(new UrlEncodedFormEntity(postParameter, UTF8));
                }
            }    
        }
        for (Entry<String, String> e : headers.entrySet()) {
            req.addHeader(e.getKey(), e.getValue());
        }
        req.getParams().setBooleanParameter(CoreProtocolPNames.USE_EXPECT_CONTINUE, false);
        resp = httpClient.execute(req);
        Header[] header = resp.getAllHeaders();
        Map<String, String> responseHeaders = new HashMap<String, String>();
        for (Header h : header) {
            responseHeaders.put(h.getName(), h.getValue());
        }
        response = new Response();
        response.setCode(resp.getStatusLine().getStatusCode());
        response.setHeaders(responseHeaders);
        String content = getContent(EntityUtils.toByteArray(resp.getEntity()));
        response.setContent(content);
        return response;
    }
 
    private boolean isStringEmpty(String s) {
        return s == null || s.length() == 0;
    }
 
    private String getContent(byte[] bytes) throws IOException {
        if (bytes == null) {
            throw new RuntimeException("[Error] Can't fetch content!");
        }
        String headerContentType = null;
        if ((headerContentType = response.getHeaders().get("Content-Type")) != null) {
            Matcher m1 = headerEncodingReg.matcher(headerContentType);
            if (m1.find()) {
                return new String(bytes, m1.group(1));
            }
        }

        String html = new String(bytes);
        Matcher m2 = pageEncodingReg.matcher(html);
        if (m2.find()) {
            html = new String(bytes, m2.group(1));
        }
        return html;
    }
 
    private void enableSSL() {
        try {
            SSLContext sslcontext = SSLContext.getInstance("TLS");
            sslcontext.init(null, new TrustManager[] { truseAllManager }, null);
            SSLSocketFactory sf = new SSLSocketFactory(sslcontext);
            sf.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
            Scheme https = new Scheme("https", sf, 443);
            httpClient.getConnectionManager().getSchemeRegistry().register(https);
        } catch (KeyManagementException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
    }
 
    private void disableSSL() {
        SchemeRegistry reg = httpClient.getConnectionManager().getSchemeRegistry();
        if (reg.get("https") != null) {
            reg.unregister("https");
        }
    }
    

    public DefaultHttpClient getHttpClient() {
        return httpClient;
    }
 
    public enum HTTPMethod {
        GET, POST, DELETE, PUT
    }
 
    // SSL handler (ignore untrusted hosts)
    private static TrustManager truseAllManager = new X509TrustManager() {
        @Override
        public X509Certificate[] getAcceptedIssuers() {
            return null;
        }
 
        @Override
        public void checkServerTrusted(X509Certificate[] chain, String authType)
                throws CertificateException {
        }
 
        @Override
        public void checkClientTrusted(X509Certificate[] chain, String authType)
                throws CertificateException {
        }
    };

    public void setPostType(String postType) {
        this.postType = postType;
    }

    public void setMultipartParameter(List<FormBodyPart> multipartParameter) {
        this.multipartParameter.clear();
        this.multipartParameter.addAll(multipartParameter);
    }
}