Java進行post和get傳引數

http://www.cnblogs.com/zhuawang/archive/2012/12/08/2809380.html

get和post方法

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傳送GET方法的請求
     * 
     * @param url
     *            傳送請求的URL
     * @param param
     *            請求引數，請求引數應該是 name1=value1&name2=value2 的形式。
     * @return URL 所代表遠端資源的響應結果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 開啟和URL之間的連線
            URLConnection connection = realUrl.openConnection();
            // 設定通用的請求屬性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立實際的連線
            connection.connect();
            // 獲取所有響應頭欄位
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍歷所有的響應頭欄位
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定義 BufferedReader輸入流來讀取URL的響應
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("傳送GET請求出現異常！" + e);
            e.printStackTrace();
        }
        // 使用finally塊來關閉輸入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 向指定 URL 傳送POST方法的請求
     * 
     * @param url
     *            傳送請求的 URL
     * @param param
     *            請求引數，請求引數應該是 name1=value1&name2=value2 的形式。
     * @return 所代表遠端資源的響應結果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 開啟和URL之間的連線
            URLConnection conn = realUrl.openConnection();
            // 設定通用的請求屬性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 傳送POST請求必須設定如下兩行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 獲取URLConnection物件對應的輸出流
            out = new PrintWriter(conn.getOutputStream());
            // 傳送請求引數
            out.print(param);
            // flush輸出流的緩衝
            out.flush();
            // 定義BufferedReader輸入流來讀取URL的響應
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("傳送 POST 請求出現異常！"+e);
            e.printStackTrace();
        }
        //使用finally塊來關閉輸出流、輸入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }    
}

呼叫

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

2、post方法

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;

public class Test {
    public static void main(String[] args) throws IOException {
        String urlStr = 
                "http://translate.googleapis.com/translate_a/t?" +
        "anno=3&client=te&format=html&v=1.0&logld=v10";
        URL url = new URL(urlStr);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setDoOutput(true);    // 可以傳送資料
        conn.setDoInput(true);    // 可以接收資料
        conn.setRequestMethod("POST");    // POST方法
        // 必須注意此處需要設定UserAgent，否則google會返回403
        conn.setRequestProperty
        ("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)");
        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        conn.connect();
        //    寫入的POST資料
        OutputStreamWriter osw = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
        osw.write("q=中國&sl=auto&tl=en&tc=1");
        osw.flush();
        osw.close();
        // 讀取響應資料
        BufferedReader in = new BufferedReader(
                new InputStreamReader(conn.getInputStream()));
        String s;
        while ((s = in.readLine()) != null)
            System.out.println(s);
    }
}