使用JavaApi实现发送Http请求

来源：互联网发布：centos6.8网络配置编辑：程序博客网时间：2024/05/19 14:20

/** * 发送HTTP请求 *  * @param path *            请求地址 * @param body *            请求体 * @param method *            请求方式GET/POST * @param charset *            请求编码格式 * @param header *            请求头 * @param readTimeout *            请求超时时间 * @param connectTimeout *            连接超时时间 * @param doOutput *            是否可写 * @param doInput *            是否可读 * @param contentType *            请求contentType * @return * @throws IOException */public static ByteArrayOutputStream sendHttpRequest(String path,String body, String method, String charset,Map<String, String> header, int readTimeout, int connectTimeout,boolean doOutput, boolean doInput, String contentType)throws Exception {HttpURLConnection httpURLConnection = null;InputStream in = null;ByteArrayOutputStream baos = null;// URL转译int index = path.indexOf("?");if (index != -1) {String urlStr = path.substring(0, index + 1);String param = path.substring(index + 1);param = URLEncode(param, charset);path = urlStr + param;}// System.out.println("====>url: " + path);URL url = new URL(path);httpURLConnection = (HttpURLConnection) url.openConnection();httpURLConnection.setRequestMethod(method);httpURLConnection.setReadTimeout(readTimeout);httpURLConnection.setConnectTimeout(connectTimeout);httpURLConnection.setDoOutput(doOutput);// 打开写入属性httpURLConnection.setDoInput(doInput);// 打开读取属性if (null != contentType && !"".equals(contentType.trim())) {httpURLConnection.setRequestProperty("Content-Type", contentType);}// 设置headerhttpURLConnection = setRequestHeader(httpURLConnection, header);httpURLConnection.connect(); // 连接if (!"GET".equalsIgnoreCase(method)) {body = URLEncode(body, charset);// System.out.println("====>body: " + body);httpURLConnection.getOutputStream().write(body.getBytes(charset));}int status = httpURLConnection.getResponseCode();System.out.println("urlparam=" + path.substring(path.indexOf("?") + 1)+ ", param=" + body + ", responseCode=" + status);if (200 == status) {in = (InputStream) httpURLConnection.getContent();baos = convert(in);} else {// System.out.println("====>response status: " + status);new Exception("responseCode is " + status);}if (httpURLConnection != null)httpURLConnection.disconnect();// 断开连接return baos;}

请求参数转译，将请求参数中的除了"&" 和 "="的字符进行url转译，当参数中包含"&"时必须在拼装参数之前进行转译，并且在接收到请求之后手工转回"&"

public static final String EQUAL = "=";public static final String AND = "&";public static final String PREFIX = "*_*";public static final String SUFFIX = "_*_";public static final String EQUAL_PS = PREFIX + EQUAL + SUFFIX;public static final String AND_PS = PREFIX + AND + SUFFIX;/** * 将参数按照指定编码格式进行URL转换 *  * @param body * @param charset * @return */public static String URLEncode(String body, String charset) {if (null == body || "".equals(body) || "".equals(body.trim())) {return "";}try {String equalEncode = URLEncoder.encode(EQUAL_PS, charset);String andEncode = URLEncoder.encode(AND_PS, charset);body = body.replace(EQUAL, EQUAL_PS);body = body.replace(AND, AND_PS);body = URLEncoder.encode(body, charset);body = body.replace(equalEncode, EQUAL);body = body.replace(andEncode, AND);} catch (UnsupportedEncodingException e) {e.printStackTrace();}// System.out.println("==>URLEncode: " + body);return body;}

由于某些地方肯能会重复使用响应的InputStream，并且，当连接关闭后，不能再读取响应的InputStream，

因此需要将InputStream转换成ByteArrayOutputStream，在使用的时候将ByteArrayOutputStream转回InputStream就行了

/** * 将respon转换为中间变量，解决由于http连接关闭导致inputStream关闭，从而不能读取的问题 *  * @param in * @return * @throws Exception */public static ByteArrayOutputStream convert(InputStream in)throws Exception {ByteArrayOutputStream baos = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len;while ((len = in.read(buffer)) > -1) {baos.write(buffer, 0, len);}baos.flush();return baos;}/** * 将中间变量还原为为请求response的inputStream *  * @param baos * @return */public static InputStream convert(ByteArrayOutputStream baos)throws Exception {return new ByteArrayInputStream(baos.toByteArray());}

对于http请求的其他固定参数，可以自定义枚举类型来处理，例如Content-type 和Charset

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