java发送http的get、post请求

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Http请求类

package wzh.Http;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.URL;import java.net.URLConnection;import java.util.List;import java.util.Map;public class HttpRequest {    /**     * 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();            // 遍历所有的响应头字段            for (String key : map.keySet()) {                System.out.println(key + "--->" + map.get(key));            }            // 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) {            System.out.println("发送GET请求出现异常！" + e);            e.printStackTrace();        }        // 使用finally块来关闭输入流        finally {            try {                if (in != null) {                    in.close();                }            } catch (Exception e2) {                e2.printStackTrace();            }        }        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) {            System.out.println("发送 POST 请求出现异常！"+e);            e.printStackTrace();        }        //使用finally块来关闭输出流、输入流        finally{            try{                if(out!=null){                    out.close();                }                if(in!=null){                    in.close();                }            }            catch(IOException ex){                ex.printStackTrace();            }        }        return result;    }    }

调用方法：

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

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URL url = null;
HttpURLConnection http = null;
try {
url = new URL(urls);
http = (HttpURLConnection) url.openConnection();
http.setDoInput(true);
http.setDoOutput(true);
http.setUseCaches(false);
http.setConnectTimeout(50000);//设置连接超时
//如果在建立连接之前超时期满，则会引发一个 java.net.SocketTimeoutException。超时时间为零表示无穷大超时。
http.setReadTimeout(50000);//设置读取超时
//如果在数据可读取之前超时期满，则会引发一个 java.net.SocketTimeoutException。超时时间为零表示无穷大超时。
http.setRequestMethod("POST");
// http.setRequestProperty("Content-Type","text/xml; charset=UTF-8");
http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
http.connect();
param = "&appName=" + appName
+ "&token=" + token
+ "&method=" + method
+ "&dataType=" + dataType
+ "&dataParams=" + dataParams
+ "&sign=" + sign;
OutputStreamWriter osw = new OutputStreamWriter(http.getOutputStream(), "utf-8");
osw.write(param);
osw.flush();
osw.close();
if (http.getResponseCode() == 200) {
BufferedReader in = new BufferedReader(new InputStreamReader(http.getInputStream(), "utf-8"));
String inputLine;
while ((inputLine = in.readLine()) != null) {
result += inputLine;
}
in.close();
//result = "["+result+"]";
}
} catch (Exception e) {
System.out.println("err");
} finally {
if (http != null) http.disconnect();
if (fis != null) fis.close();
}

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