向服务器发送请求参数

本文主要是介绍向服务器发送请求参数，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

用GET方式向服务器发送请求参数

        //path为请求路径，Map<String, String> params用来存放参数值，String enc编码格式
public static boolean sendGetRequest(String path, Map<String, String> params, String enc) throws Exception{
  StringBuilder sb = new StringBuilder(path);
  sb.append('?');
  //例如提交参数为 ?method=save&title=123&timelength=10
  for(Map.Entry<String, String> entry : params.entrySet()){
   sb.append(entry.getKey()).append('=')
    .append(URLEncoder.encode(entry.getValue(), enc)).append('&');
  }
  sb.deleteCharAt(sb.length()-1);

  URL url = new URL(sb.toString());
  HttpURLConnection conn = (HttpURLConnection)url.openConnection();
  conn.setRequestMethod("GET");
  conn.setConnectTimeout(5 * 1000);
  if(conn.getResponseCode()==200){
   return true;
  }
  return false
               }

用POST方式向服务器发送请求参数

            public static boolean sendPostRequest(String path, Map<String, String> params, String enc) throws Exception{
  //例如提交参数为 ?method=save&title=123&timelength=10
  StringBuilder sb = new StringBuilder();
  if(params!=null && !params.isEmpty()){
   for(Map.Entry<String, String> entry : params.entrySet()){
    sb.append(entry.getKey()).append('=')
     .append(URLEncoder.encode(entry.getValue(), enc)).append('&');
   }
   sb.deleteCharAt(sb.length()-1);
  }
  byte[] entitydata = sb.toString().getBytes();//得到实体的二进制数据
  URL url = new URL(path);
  HttpURLConnection conn = (HttpURLConnection)url.openConnection();
  conn.setRequestMethod("POST");
  conn.setConnectTimeout(5 * 1000);
  conn.setDoOutput(true);//如果通过post提交数据，必须设置允许对外输出数据
  //Content-Type: application/x-www-form-urlencoded
  //Content-Length: 38
  conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");//设置http协议的头字段，内容类型
  conn.setRequestProperty("Content-Length", String.valueOf(entitydata.length));//设置http协议的头字段，内容长度
  OutputStream outStream = conn.getOutputStream();//得到输出流对象
  outStream.write(entitydata);
  outStream.flush();
  outStream.close();
  if(conn.getResponseCode()==200){
   return true;
  }
  return false;
}

使用HttpClient开源项目向服务器发送请求参数（可以看作是IE浏览器的API集合）

           public static boolean sendRequestFromHttpClient(String path, Map<String, String> params, String enc) throws Exception{
  List<NameValuePair> paramPairs = new ArrayList<NameValuePair>();//请求参数放在List<NameValuePair>里面存放
  if(params!=null && !params.isEmpty()){
   for(Map.Entry<String, String> entry : params.entrySet()){
    paramPairs.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
   }
  }
  UrlEncodedFormEntity entitydata = new UrlEncodedFormEntity(paramPairs, enc);//得到经过编码过后的实体数据
  HttpPost post = new HttpPost(path);
  post.setEntity(entitydata);
  DefaultHttpClient client = new DefaultHttpClient(); //可以看作浏览器
  HttpResponse response = client.execute(post);//执行请求
  if(response.getStatusLine().getStatusCode()==200){
   return true;
  }
  return false;
}