Java_HttpURLConnection使用

包括使用HttpURLConnection执行get/post请求
package com.cn.testproject;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class HttpConnectionUrlDemo {
    public static void main(String[] args) throws Exception {
        //get();
        post();
    }
 
    public static void get() throws Exception {
        String path = "http://www.baidu.com";
        URL url = new URL(path);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setConnectTimeout(5 * 1000);
        conn.setRequestMethod("GET");
        InputStream inStream = conn.getInputStream();
        byte[] data = toByteArray(inStream);
        String result = new String(data, "UTF-8");
        System.out.println(result);
    }
 
    public static void post() throws Exception {
        String encoding = "UTF-8";
        //post的form参数(json兼职对)
        String params = "[{"addTime":"2011-09-19 14:23:02"[],"iccid":"1111","id":0,"imei":"2222","imsi":"3333","phoneType":"4444","remark":"aaaa","tel":"5555"}]";
        String path = "http://www.baidu.com";
        byte[] data = params.getBytes(encoding);
        URL url = new URL(path);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("POST");
        conn.setDoOutput(true);
     
        conn.setRequestProperty("Content-Type", "application/x-javascript; charset=" + encoding);
        conn.setRequestProperty("Content-Length", String.valueOf(data.length));
        conn.setConnectTimeout(5 * 1000);
        OutputStream outStream = conn.getOutputStream();
        outStream.write(data);
        outStream.flush();
        outStream.close();
        System.out.println(conn.getResponseCode()); // 响应代码 200表示成功
        if (conn.getResponseCode() == 200) {
            InputStream inStream = conn.getInputStream();
            String result = new String(toByteArray(inStream), "UTF-8");
            System.out.println(result); // 响应代码 200表示成功
        }
    }
    private static byte[] toByteArray(InputStream input) throws IOException {
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        byte[] buffer = new byte[4096];
        int n = 0;
        while (-1 != (n = input.read(buffer))) {
            output.write(buffer, 0, n);
        }
        return output.toByteArray();
    }
}