使用GET和POST方式将数据提交给服务器

/**
* 发送GET请求
* @param path 请求路径
* @param params 请求参数
* @param encoding 编码
* @return response的读取流,请求失败，返回null
*/
public static InputStream sendGETRequest(String path, Map<String, String> params, String ecoding) throws Exception{
// http://192.168.1.100:8080/web/ManageServlet?title=xxx&timelength=90 StringBuilder url = new StringBuilder(path);
url.append("?");
for(Map.Entry<String, String> entry : params.entrySet()){
url.append(entry.getKey()).append("=");
url.append(URLEncoder.encode(entry.getValue(), ecoding));
url.append("&");
}
url.deleteCharAt(url.length() - 1);
HttpURLConnection conn = (HttpURLConnection)new URL(url.toString()).openConnection();
conn.setConnectTimeout(5000);
conn.setRequestMethod("GET");
if(conn.getResponseCode() == 200){
return conn.getInputStream();
}
return null;
}

/**
* 发送Post请求
* @param path 请求路径
* @param params 请求参数
* @param encoding 编码
* @return response的读取流,请求失败，返回null
*/
public static InputStream sendPOSTRequest(String path, Map<String, String> params, String encoding) throws Exception{
//title=liming&timelength=90
StringBuilder data = new StringBuilder();
if(params!=null && !params.isEmpty()){
for(Map.Entry<String, String> entry : params.entrySet()){
data.append(entry.getKey()).append("=");
data.append(URLEncoder.encode(entry.getValue(), encoding));
data.append("&");
}
data.deleteCharAt(data.length() - 1);
}
byte[] entity = data.toString().getBytes();//生成实体数据
HttpURLConnection conn = (HttpURLConnection) new URL(path).openConnection();
conn.setConnectTimeout(5000);
conn.setRequestMethod("POST");
conn.setDoOutput(true);//允许对外输出数据
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
conn.setRequestProperty("Content-Length", String.valueOf(entity.length));
OutputStream outStream = conn.getOutputStream();
outStream.write(entity);
if(conn.getResponseCode() == 200){
return conn.getInputStream();
}
return null;
}

/**
* 通过HttpClient发送Post请求
* @param path 请求路径
* @param params 请求参数
* @param encoding 编码
* @return response的读取流,请求失败，返回null
*/
public static InputStream sendHttpClientPOSTRequest(String path, Map<String, String> params, String encoding) throws Exception{
List<NameValuePair> pairs = new ArrayList<NameValuePair>();//存放请求参数
if(params!=null && !params.isEmpty()){
for(Map.Entry<String, String> entry : params.entrySet()){
pairs.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
}
}
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(pairs, encoding);
HttpPost httpPost = new HttpPost(path);
httpPost.setEntity(entity);
DefaultHttpClient client = new DefaultHttpClient();
HttpResponse response = client.execute(httpPost);
if(response.getStatusLine().getStatusCode() == 200){
return response.getEntity().getContent();
}
return null;
}

/**
* 向webservice服务器使用post方式提交xml数据
* url : http://webservice.webxml.com.cn/WebServices/MobileCodeWS.asmx * entityData : soap协议：基于xml格式数据的二进制表示
* contentType ：http协议头字段  如："application/soap+xml; charset=utf-8"
* 返回值：服务器返回数据的读取流,请求失败，返回null
*/
public static InputStream postEntityData(String url,byte[] entityData,String contentType) throws Exception{
HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
conn.setConnectTimeout(5000);
conn.setRequestMethod("POST");
conn.setDoOutput(true);
conn.setRequestProperty("Content-Type", contentType);
conn.setRequestProperty("Content-Length", String.valueOf(entityData.length));
conn.getOutputStream().write(entityData);
if(conn.getResponseCode() == 200){
return conn.getInputStream();
}
return null;
}

/**
* 从流中读取数据
* @param inStream
* @return 二进制数据
*/
public static byte[] readFromInputStream(InputStream inStream) throws Exception{
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while( (len = inStream.read(buffer)) != -1){
outputStream.write(buffer, 0, len);
}
outputStream.close();
inStream.close();
return outputStream.toByteArray();
}