java程序发送HTTP请求

Java 程序如何发送HTTP请求呢?

有两种实现方式:

1,HttpURLConnection

2,HttpClient

依赖jar包:

 

 

Object[] resultArr = HttpSocketUtil.httpRequest(url, ssl22,
                        forcePost22, json_request, contentType,
                        session, headerMap, false, null, newEncoding,
                        15000, 25000);
                if(ValueWidget.isNullOrEmpty(resultArr)){
                    GUIUtil23.errorDialog("404");
                    return;
                }
                byte[] resultJsonBytes = (byte[])resultArr[0];
                if (ValueWidget.isNullOrEmpty(resultJsonBytes)) {
                    resultTA.setText("请检查请求的url 是否正确(" + url + ")");
                    GUIUtil23.warningDialog("返回结果为空.");
                    return;
                }
                String resultJson = new String(resultJsonBytes,
                        SystemHWUtil.CHARSET_GBK);
                String resultJson2 = new String(resultJsonBytes,
                        SystemHWUtil.CHARSET_UTF);

                // 把http请求结果（json字符串）转化为map
                Map resultMap = null;
                // if(!"{}".equals(resultJson2.replaceAll(" ", ""))){//"{}"
                resultMap = JsonUtils.getMap(resultJson2);// }
                // System.out.println(resultMap);
                // 判断该接口是否是启动接口，因为启动接口会返回token
                if (!ValueWidget.isNullOrEmpty(resultMap)
                        && resultMap.containsKey(token_label)) {
                    addInputBox(token_label, (String)resultMap.get(token_label));
                }else{//server not offer token

                }
                // String sessionID = caseDetail.getSessionId();
                // if (!ValueWidget.isNullOrEmpty(sessionID)) {
                // addInputBox( sessionId_label, sessionID);
                // }
                if (!ValueWidget.isNullOrEmpty(resultArr[1])) {
                    session = (String)resultArr[1];
                }
                if (!ValueWidget.isNullOrEmpty(session)) {
                    sessionTF.setText(session);
                }

 

httpRequest的返回值是一个数组:

返回数组有4个元素,分别是:

1,request result(byte[]):应答体

2,sessionId

3,contentType:应答的content type;

4,response code:HTTP 状态码

httpRequest 的实现如下:

/***
     *
     * @param urlStr
     * @param ssl
     * @param forcePost
     * @param sendData
     * @param contentType
     * @param cookie
     * @param headers
     * @param isWrite2file
     * @param destFile
     * @param charset
     * @param connectTimeout
     * @param readTimeout
     * @return : request result(byte[]) ;sessionId;contentType;response code
     * @throws Exception
     */
    public static Object[] httpRequest(String urlStr, boolean ssl,
            boolean forcePost, String sendData, String contentType,
            String cookie, Map headers, boolean isWrite2file,
            Object destFile, String charset, int connectTimeout, int readTimeout)
            throws Exception {
        return httpRequest(urlStr, ssl, forcePost, sendData, contentType,
                cookie, headers, isWrite2file, destFile, charset,
                connectTimeout, readTimeout, null);
    }

/***
     *
     * @param urlStr
     * @param sendData
     * @param contentType
     *            : default is application/x-www-form-urlencoded
     * @param cookie
     * @param headers
     *            : request header
     * @param isWrite2file
     *            : whether write to file
     * @param destFile
     *            file which will be written
     * @return : request result(byte[]) ;sessionId;contentType;response code
     * @throws Exception
     */
    public static Object[] httpRequest(String urlStr, boolean ssl,
            boolean forcePost, String sendData, String contentType,
            String cookie, Map headers, boolean isWrite2file,
            Object destFile, String charset, int connectTimeout,
            int readTimeout, String sizeHeadKey) throws Exception {
        // URL url = new URL(urlString);
        if (isDetail)
            System.out.println("ssl:" + ssl);
        HttpURLConnection huc = beforeConnect(urlStr, ssl, forcePost, sendData,
                contentType, cookie, headers, charset, connectTimeout,
                readTimeout);

        File writeFile = null;
        if (destFile instanceof File) {
            writeFile = (File) destFile;
        } else {
            if (!ValueWidget.isNullOrEmpty(destFile)) {
                writeFile = new File((String) destFile);
            }
        }
        if (isDetail)
            System.out.println("writeFile:" + writeFile);
        //应答码,返回码
        int resCode = huc.getResponseCode();
        byte[] result = connection(resCode,huc, isWrite2file, writeFile, sizeHeadKey);
        if (!isWrite2file && (result == null)) {
            System.out
                    .println("[HttpSocketUtil.httpRequest]connection return is null.");
            return null;
        }
        if (!ValueWidget.isNullOrEmpty(result)) {
            System.out.println("read result length of bytes:" + result.length);
        }
        Object[] retArr = new Object[3];
        String session_value = huc
                .getHeaderField(SystemHWUtil.KEY_HEADER_COOLIE);
        // Map> responseHeaders = huc.getHeaderFields();
        // for (Iterator it = responseHeaders.keySet().iterator();
        // it.hasNext();) {
        // System.out.println("key:" + it.next());
        // }
        if (ValueWidget.isHasValue(session_value)) {
            String[] sessionId = session_value.split(";");
            retArr[1] = sessionId[0];
            if (isDetail) {
                System.out
                        .println("[HttpSocketUtil.httpRequest]session id is :"
                                + sessionId[0]);
            }
        }
        retArr[2] = huc.getContentType();
        retArr[3] = resCode;
        retArr[0] = result;
        // if (isWrite2file && destFile != null) {
        // byte[] bytes = (byte[]) result;
        //
        // FileUtils.writeBytesToFile(bytes, writeFile);
        // }
        return retArr;
    }

源码见:com.http.util.HttpSocketUtil 

下载地址:http://pan.baidu.com/s/1hqeXBhE