Http请求的工具类 HttpRequest

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.net.URL;

import java.net.URLConnection;

import java.util.List;

import java.util.Map;

public class HttpRequest {

    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://192.168.31.227:8080/fbtj/webChat/offerNum", "id=1230,,user=tom");

        System.out.println(sr);

    }

    /**
     * 
     * 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(), "utf-8"));

            // 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(new OutputStreamWriter(conn.getOutputStream(), "utf-8"));

            // 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(), "utf-8"));

            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;

    }

}