Java发送http请求代码示例

/**
 * Created by shangyidong on 16/7/28.
 */
public class HttpUtil {
    private static final AvatarLogger logger = AvatarLoggerFactory.getLogger(HttpUtil.class);

    /**
     * 向指定URL发送GET方法的请求
     *
     * @param url
     *            发送请求的URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            /*
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            */
            // 遍历所有的响应头字段
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            logger.error("发送GET请求出现异常", e);
        } finally {//关闭输入流
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e) {
                logger.error(e);
            }
        }
        return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url
     *            发送请求的 URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            logger.error("发送POST请求出现异常", e);
        } finally {
            //关闭输出流、输入流
            try {
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            } catch (IOException e){
                logger.error(e);
            }
        }
        return result;
    }

    public static String sendPostMethod(String url, String title, String content, String warnContactList){
        return sendPost(url, "domain=&typeItem=Page&level=1&url=&title=" + title + "&typeObject=Web&content=" + content + "&source=mkt-monitor&typeAttribute=Content&notifier=[" + warnContactList + "]&severity=high");
    }

    public static void main(String[] args){
        //发送 GET 请求
        //String s = HttpUtil.sendGet("http://localhost:6144/Home/RequestString", "key=123&v=456");
        //System.out.println(s);

        //发送 POST 请求
        String sr = HttpUtil.sendPost("http://****/report/alarm", "domain=&typeItem=Page&level=1&url=&title=测试告警测试告警test&typeObject=Web&content=测试告警内容&source=mkt-monitor&typeAttribute=Content&notifier=[{\"mobile\": \"170****0278\", \"notify_methods\": \"email,weixin,sms\", \"email\": \"shangyidong@***.com\", \"name\": \"shangyidong\"},{\"mobile\": \"183****6723\", \"notify_methods\": \"email,weixin,sms\", \"email\": \"yangcheng15@***.com\", \"name\": \"yangcheng15\"}]&severity=high");
        System.out.println(sr);
    }
}