httpClient工具类

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httpclient工具类

本人封装的，常用的get、post表单提交、postJson提交都已做了封装，暂时没有加上请求超时时间
public class HttpClientUtil {    /**     * 发送get请求     * @param url     * @return     * @throws ClientProtocolException     * @throws IOException     * @throws URISyntaxException     */    public static final String doGet(String url) throws ClientProtocolException, IOException, URISyntaxException{        return doGet(url,null);    }    /**     * 发送get请求     * @param url     * @param param     * @return     * @throws ClientProtocolException     * @throws IOException     * @throws URISyntaxException     */    public static final String doGet(String url,Map<String,String> param) throws ClientProtocolException, IOException, URISyntaxException{        return doGet(url,null,null);    }    /**     * 发送get请求     * @param url     * @param param     * @param headers     * @return     * @throws ClientProtocolException     * @throws IOException     * @throws URISyntaxException     */    public static final String doGet(String url,Map<String,String> param,Map<String,Object> headers) throws ClientProtocolException, IOException, URISyntaxException{        CloseableHttpClient httpClient = HttpClients.createDefault();        String resultString =null;        CloseableHttpResponse response =null;        try{            URIBuilder uriBuilder = new URIBuilder(url);            if(param!=null){                for(Map.Entry<String, String> entry:param.entrySet()){                    uriBuilder.addParameter(entry.getKey(), entry.getValue());                }            }            HttpGet httpGet = new HttpGet(uriBuilder.build());            setHeaders(httpGet, headers);            response=httpClient.execute(httpGet);            if(response.getStatusLine().getStatusCode()==200){                resultString=EntityUtils.toString(response.getEntity(),"UTF-8");            }        }        finally{            if(response!=null){                response.close();            }            httpClient.close();        }        return resultString;    }    /**     * 发送POST请求     * @param url     * @param json     * @return     * @throws ClientProtocolException     * @throws IOException     */    public static final String doPostJson(String url,String json) throws ClientProtocolException, IOException{        return doPostJson(url, json,null);    }    /**     * 发送POST请求     * @param url     * @param json     * @param headers     * @return     * @throws ClientProtocolException     * @throws IOException     */    public static final String doPostJson(String url,String json,Map<String,Object> headers) throws ClientProtocolException, IOException{        CloseableHttpClient httpClient = HttpClients.createDefault();        String resultString =null;        CloseableHttpResponse response =null;        try{            HttpPost httpPost = new HttpPost(url);            StringEntity stringEntity = new StringEntity(json, ContentType.APPLICATION_JSON);            httpPost.setEntity(stringEntity);            httpPost.setHeader("Content-Type", "application/json");            setHeaders(httpPost, headers);            response=httpClient.execute(httpPost);            if(response.getStatusLine().getStatusCode()==200){                resultString=EntityUtils.toString(response.getEntity(),"UTF-8");            }        }        finally{            if(response!=null){                response.close();            }            httpClient.close();        }        return resultString;    }    /**     * 以表单的方式提交post     * @param url     * @return     * @throws ClientProtocolException     * @throws IOException     */    public static final String doPost(String url) throws ClientProtocolException, IOException{        return doPost(url,null);    }    /**     * 以表单的方式提交post     * @param url     * @param param     * @return     * @throws ClientProtocolException     * @throws IOException     */    public static final String doPost(String url,Map<String,String> param) throws ClientProtocolException, IOException{        return doPost(url,param,null);    }    /**     * 以表单的方式提交Post请求     * @param url     * @param param     * @param headers     * @return     * @throws ClientProtocolException     * @throws IOException     */    public static final String doPost(String url,Map<String,String> param,Map<String,Object> headers) throws ClientProtocolException, IOException{        CloseableHttpClient httpClient = HttpClients.createDefault();        String resultString =null;        CloseableHttpResponse response =null;        try{            HttpPost httpPost = new HttpPost(url);            if(param!=null){                List<NameValuePair> nameValuePairs = new ArrayList<>();                for(Map.Entry<String, String> entry:param.entrySet()){                    nameValuePairs.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));                }                UrlEncodedFormEntity urlEncodedFormEntity =new UrlEncodedFormEntity(nameValuePairs);                httpPost.setEntity(urlEncodedFormEntity);            }            setHeaders(httpPost, headers);            response=httpClient.execute(httpPost);            if(response.getStatusLine().getStatusCode()==200){                resultString=EntityUtils.toString(response.getEntity(),"UTF-8");            }        }        finally{            if(response!=null){                response.close();            }            httpClient.close();        }        return resultString;    }    private static final void setHeaders(HttpUriRequest uriRequest,Map<String,Object> headers){        if(headers==null){            if(headers!=null){                for(Map.Entry<String, Object> entry:headers.entrySet()){                    uriRequest.addHeader(entry.getKey(), entry.getValue().toString());                }            }        }    }
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