Java 构造 GET/POST 请求

package test;

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);    // 可以发送数据
        conn.setDoInput(true);    // 可以接收数据
        conn.setRequestMethod("POST");    // POST方法
        // 必须注意此处需要设置UserAgent，否则google会返回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();
        //    写入的POST数据
        OutputStreamWriter osw = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
        osw.write("q=中国&sl=auto&tl=en&tc=1");
        osw.flush();
        osw.close();
        // 读取响应数据
        BufferedReader in = new BufferedReader(
                new InputStreamReader(conn.getInputStream()));
        String s;
        while ((s = in.readLine()) != null)
            System.out.println(s);
    }
}