Java HttpURLConnection使用方法详解

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();  }}