JAVA發送http get/post請求，調用http介面、方法__JAVA

三個例子 —JAVA發送http get/post請求，調用http介面、方法

例1：使用 HttpClient （commons-httpclient-3.0.jar 
jar下載地址：http://download.csdn.net/download/capmiachael/9760550）

import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import org.apache.commons.httpclient.HttpClient;import org.apache.commons.httpclient.methods.InputStreamRequestEntity;import org.apache.commons.httpclient.methods.PostMethod;import org.apache.commons.httpclient.methods.RequestEntity;public class HttpTool {    /**     * 發送post請求     *      * @author Michael -----CSDN: http://blog.csdn.net/capmiachael     * @param params     *            參數     * @param requestUrl     *            請求地址     * @param authorization     *            授權書     * @return 返回結果     * @throws IOException     */    public static String sendPost(String params, String requestUrl,            String authorization) throws IOException {        byte[] requestBytes = params.getBytes("utf-8"); // 將參數轉為二進位流        HttpClient httpClient = new HttpClient();// 用戶端執行個體化        PostMethod postMethod = new PostMethod(requestUrl);        //佈建要求頭Authorization        postMethod.setRequestHeader("Authorization", "Basic " + authorization);        // 佈建要求頭  Content-Type        postMethod.setRequestHeader("Content-Type", "application/json");        InputStream inputStream = new ByteArrayInputStream(requestBytes, 0,                requestBytes.length);        RequestEntity requestEntity = new InputStreamRequestEntity(inputStream,                requestBytes.length, "application/json; charset=utf-8"); // 請求體        postMethod.setRequestEntity(requestEntity);        httpClient.executeMethod(postMethod);// 執行請求        InputStream soapResponseStream = postMethod.getResponseBodyAsStream();// 擷取返回的流        byte[] datas = null;        try {            datas = readInputStream(soapResponseStream);// 從輸入資料流中讀取資料        } catch (Exception e) {            e.printStackTrace();        }        String result = new String(datas, "UTF-8");// 將二進位流轉為String        // 列印返回結果        // System.out.println(result);        return result;    }    /**     * 從輸入資料流中讀取資料     *      * @param inStream     * @return     * @throws Exception     */    public static byte[] readInputStream(InputStream inStream) throws Exception {        ByteArrayOutputStream outStream = new ByteArrayOutputStream();        byte[] buffer = new byte[1024];        int len = 0;        while ((len = inStream.read(buffer)) != -1) {            outStream.write(buffer, 0, len);        }        byte[] data = outStream.toByteArray();        outStream.close();        inStream.close();        return data;    }}

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例2： 來源：開源中國 teardream http://www.oschina.net/code/snippet_2266157_45252

import java.io.BufferedReader;  import java.io.IOException;import java.io.InputStream;  import java.io.InputStreamReader;  import java.io.OutputStreamWriter;import java.io.UnsupportedEncodingException;  import java.net.HttpURLConnection;  import java.net.InetSocketAddress;import java.net.Proxy;import java.net.URL; import java.net.URLConnection;import java.util.List;import java.util.Map;/**  * Http請求工具類  * @author snowfigure  * @since 2014-8-24 13:30:56  * @version v1.0.1  */public class HttpRequestUtil {    static boolean proxySet = false;    static String proxyHost = "127.0.0.1";    static int proxyPort = 8087;    /**      * 編碼      * @param source      * @return      */     public static String urlEncode(String source,String encode) {          String result = source;          try {              result = java.net.URLEncoder.encode(source,encode);          } catch (UnsupportedEncodingException e) {              e.printStackTrace();              return "0";          }          return result;      }    public static String urlEncodeGBK(String source) {          String result = source;          try {              result = java.net.URLEncoder.encode(source,"GBK");          } catch (UnsupportedEncodingException e) {              e.printStackTrace();              return "0";          }          return result;      }    /**      * 發起http請求擷取返回結果      * @param req_url 請求地址      * @return      */     public static String httpRequest(String req_url) {        StringBuffer buffer = new StringBuffer();          try {              URL url = new URL(req_url);              HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();              httpUrlConn.setDoOutput(false);              httpUrlConn.setDoInput(true);              httpUrlConn.setUseCaches(false);              httpUrlConn.setRequestMethod("GET");              httpUrlConn.connect();              // 將返回的輸入資料流轉換成字串              InputStream inputStream = httpUrlConn.getInputStream();              InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");              BufferedReader bufferedReader = new BufferedReader(inputStreamReader);              String str = null;              while ((str = bufferedReader.readLine()) != null) {                  buffer.append(str);              }              bufferedReader.close();              inputStreamReader.close();              // 釋放資源              inputStream.close();              inputStream = null;              httpUrlConn.disconnect();          } catch (Exception e) {              System.out.println(e.getStackTrace());          }          return buffer.toString();      }      /**      * 發送http請求取得返回的輸入資料流      * @param requestUrl 請求地址      * @return InputStream      */     public static InputStream httpRequestIO(String requestUrl) {          InputStream inputStream = null;          try {              URL url = new URL(requestUrl);              HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();              httpUrlConn.setDoInput(true);              httpUrlConn.setRequestMethod("GET");              httpUrlConn.connect();              // 獲得返回的輸入資料流              inputStream = httpUrlConn.getInputStream();          } catch (Exception e) {              e.printStackTrace();          }          return inputStream;      }    /**     * 向指定URL發送GET方法的請求     *      * @param url     *            發送請求的URL     * @param param     *            請求參數，請求參數應該是 name1=value1&name2=value2 的形式。     * @return URL 所代表遠端資源的響應結果     */    public static String sendGet(String url, String param) {        String result = "";        BufferedReader in = null;        try {            String urlNameString = url + "?" + param;            URL realUrl = new URL(urlNameString);            // 開啟和URL之間的串連            URLConnection connection = realUrl.openConnection();            // 設定通用的請求屬性            connection.setRequestProperty("accept", "*/*");            connection.setRequestProperty("connection", "Keep-Alive");            connection.setRequestProperty("user-agent",                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");            // 建立實際的串連            connection.connect();            // 擷取所有回應標頭欄位            Map<String, List<String>> map = connection.getHeaderFields();            // 遍曆所有的回應標頭欄位            for (String key : map.keySet()) {                System.out.println(key + "--->" + map.get(key));            }            // 定義 BufferedReader輸入資料流來讀取URL的響應            in = new BufferedReader(new InputStreamReader(                    connection.getInputStream()));            String line;            while ((line = in.readLine()) != null) {                result += line;            }        } catch (Exception e) {            System.out.println("發送GET請求出現異常。" + e);            e.printStackTrace();        }        // 使用finally塊來關閉輸入資料流        finally {            try {                if (in != null) {                    in.close();                }            } catch (Exception e2) {                e2.printStackTrace();            }        }        return result;    }    /**     * 向指定 URL 發送POST方法的請求     *      * @param url     *            發送請求的 URL     * @param param     *            請求參數，請求參數應該是 name1=value1&name2=value2 的形式。     * @param isproxy     *               是否使用代理模式     * @return 所代表遠端資源的響應結果     */    public static String sendPost(String url, String param,boolean isproxy) {        OutputStreamWriter out = null;        BufferedReader in = null;        String result = "";        try {            URL realUrl = new URL(url);            HttpURLConnection conn = null;            if(isproxy){//使用代理模式                @SuppressWarnings("static-access")                Proxy proxy = new Proxy(Proxy.Type.DIRECT.HTTP, new InetSocketAddress(proxyHost, proxyPort));                conn = (HttpURLConnection) realUrl.openConnection(proxy);            }else{                conn = (HttpURLConnection) realUrl.openConnection();            }            // 開啟和URL之間的串連            // 發送POST請求必須設定如下兩行            conn.setDoOutput(true);            conn.setDoInput(true);            conn.setRequestMethod("POST");    // POST方法            // 設定通用的請求屬性            conn.setRequestProperty("accept", "*/*");            conn.setRequestProperty("connection", "Keep-Alive");            conn.setRequestProperty("user-agent",                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");            conn.setRequestP