android向服务器提交数据的几种方式
GET:
1 public static String loginByGet(String username,String password){ 2 try { 3 //定义路径 4 String path="http://192.168.1.102:8084/androidServer/loginServlet?username=" 5 +URLEncoder.encode(URLEncoder.encode(username,"UTF-8"), "UTF-8")+"&password="+password; 6 URL url=new URL(path);//包装路径 7 HttpURLConnection conn=(HttpURLConnection) url.openConnection();//打开连接 8 conn.setConnectTimeout(5000);//设置连接超时 9 conn.setReadTimeout(5000);//设置读取超时 10 conn.setRequestMethod("GET");//设置提交方式 11 int code=conn.getResponseCode();//获取响应码 12 if(code==200){ 13 //请求成功 14 InputStream is=conn.getInputStream();//获取输入流 15 ByteArrayOutputStream baos=new ByteArrayOutputStream();//定义字节数组输出流 16 int len=0; 17 byte[] buffer=new byte[1024];//设置缓存 18 while((len=is.read(buffer))!=-1){ 19 baos.write(buffer);//将缓存中的字节数据读入字节数组输出流 20 } 21 byte[] result=baos.toByteArray();//转换成字节数组 22 String str=new String(result);//转换成字符串 23 return str; 24 }else{ 25 return null; 26 } 27 } catch (Exception e) { 28 e.printStackTrace(); 29 return null; 30 } 31 }
POST:
1 public static String loginByPost(String username,String password){ 2 String path="http://192.168.1.102:8084/androidServer/loginServlet";//定义路径 3 try { 4 URL url=new URL(path); 5 HttpURLConnection conn=(HttpURLConnection) url.openConnection();//打开连接 6 //编码数据(post提交中文只编码一次，编码两次亦可，GET需要编码两次) 7 String data="username="+URLEncoder.encode(URLEncoder.encode(username,"UTF-8"), "UTF-8")+"&password="+password; 8 conn.setConnectTimeout(5000); 9 conn.setReadTimeout(5000); 10 conn.setRequestMethod("POST"); 11 //一下几项必须设置 12 conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");//设置内容类型 13 conn.setRequestProperty("Content-Length", data.length()+"");//设置内容长度 14 conn.setDoOutput(true);//设置允许输出 15 OutputStream os=conn.getOutputStream();//获取输出流 16 os.write(data.getBytes());//输出数据 17 int code=conn.getResponseCode(); 18 if(code==200){ 19 //请求成功 20 InputStream is=conn.getInputStream(); 21 ByteArrayOutputStream baos=new ByteArrayOutputStream(); 22 int len=0; 23 byte[] buffer=new byte[1024]; 24 while((len=is.read(buffer))!=-1){ 25 baos.write(buffer); 26 } 27 byte[] result=baos.toByteArray(); 28 String str=new String(result); 29 return str; 30 }else{ 31 return null; 32 } 33 } catch (Exception e) { 34 e.printStackTrace(); 35 return null; 36 } 37 }
HttpClient GET(模拟浏览器)：
1 public static String loginByClientGet(String username,String password){ 2 String str=null; 3 try { 4 //打开一个浏览器 5 HttpClient client = new DefaultHttpClient(); 6 //输入地址 7 String path = "http://192.168.1.102:8084/androidServer/loginServlet?username=" 8 + URLEncoder.encode(URLEncoder.encode(username, "UTF-8"),"UTF-8") + "&password=" + password; 9 HttpGet get = new HttpGet(path);//构建请求对象 10 //敲回车 11 HttpResponse response = client.execute(get);//获得相应结果 12 if(response.getStatusLine().getStatusCode()==200){//判断状态码 13 InputStream is=response.getEntity().getContent();//获取内容输入流 14 ByteArrayOutputStream baos=new ByteArrayOutputStream(); 15 int len=0; 16 byte[] buffer=new byte[1024]; 17 while((len=is.read(buffer))!=-1){ 18 baos.write(buffer); 19 } 20 byte[] result=baos.toByteArray(); 21 str=new String(result); 22 return str; 23 } 24 } catch (Exception e) { 25 e.printStackTrace(); 26 return str; 27 } 28 return null; 29 }
HttpClient POST:
1 public static String loginByClientPOST(String username,String password){ 2 String str=null; 3 try { 4 //打开一个浏览器 5 HttpClient client = new DefaultHttpClient(); 6 //输入地址 7 String path = "http://192.168.1.102:8084/androidServer/loginServlet"; 8 HttpPost post = new HttpPost(path); 9 //制定要提交的数据实体 10 List<NameValuePair> parameters = new ArrayList<NameValuePair>(); 11 parameters.add(new BasicNameValuePair("username", username));//设置数据 12 parameters.add(new BasicNameValuePair("password", password)); 13 post.setEntity(new UrlEncodedFormEntity(parameters, "UTF-8")); 14 15 //敲回车（与get一致） 16 HttpResponse response = client.execute(post);//获得相应结果 17 if(response.getStatusLine().getStatusCode()==200){//判断状态码 18 InputStream is=response.getEntity().getContent();//获取内容输入流 19 ByteArrayOutputStream baos=new ByteArrayOutputStream(); 20 int len=0; 21 byte[] buffer=new byte[1024]; 22 while((len=is.read(buffer))!=-1){ 23 baos.write(buffer); 24 } 25 byte[] result=baos.toByteArray(); 26 str=new String(result); 27 return str; 28 } 29 } catch (Exception e) { 30 e.printStackTrace(); 31 } 32 return ""; 33 }
调用：
1 public void login(View v){ 2 final String username=et_username.getText().toString().trim(); 3 final String password=et_password.getText().toString().trim(); 4 5 new Thread(){ 6 public void run() { 7 final String str=Service.loginByGet(username, password); 8 if(str!=null){ 9 runOnUiThread(new Runnable() {//joinUI线程更新界面 10 public void run() { 11 Toast.makeText(MainActivity.this, str, Toast.LENGTH_SHORT).show(); 12 } 13 }); 14 }else{ 15 runOnUiThread(new Runnable() { 16 public void run() { 17 Toast.makeText(MainActivity.this, "请求失败", Toast.LENGTH_SHORT).show(); 18 } 19 }); 20 } 21 }; 22 }.start(); 23 }
服务端servlet
1 public void doGet(HttpServletRequest request, HttpServletResponse response) 2 throws ServletException, IOException { 3 response.setContentType("text/html;charset=utf-8");//设置响应类型和编码 4 PrintWriter out = response.getWriter();//获取输出流 5 request.setCharacterEncoding("utf-8");//设置处理请求编码 6 String username=URLDecoder.decode(request.getParameter("username"),"utf-8");//解码请求参数 7 String password=request.getParameter("password"); 8 //System.out.println("username="+username+",password="+password); 9 if("admin".equals(username)&&"123".equals(password)){ 10 out.print("登陆成功"); 11 }else{ 12 out.print("登录失败"); 13 } 14 } 15 16 public void doPost(HttpServletRequest request, HttpServletResponse response) 17 throws ServletException, IOException { 18 19 doGet(request, response); 20 }
