[android] 13_GET方式提交数据-HttpUrlConnection

Android 4.0

GET方式提交数据

核心代码：

1、Android端

// 开启一个新的线程，发送请求到服务器



new   Thread
()   {
     @Override
     public   void   run
()   {
         super . run
();
         try   {
             String   result   =   LoginService . loginByGet (
username ,   password
);
             System
. out . println ( "登录状态：" + result
);
         }   catch   (
IOException   e
)   {
             e
. printStackTrace
();
         }
     }
}.
start ();




/**
* 1、GET方式进行登录
*
* @throws
IOException
*/
public static String loginByGet(String username,
String password)
        throws IOException
{
 
    username = URLEncoder.encode(username, "utf-8");
    String path
= "http://192.168.221.221:8080/web/LoginServlet?username="+username+"&password="+password;
 
    URL
url = new
URL(path);
    HttpURLConnection conn = (HttpURLConnection)
url.openConnection();
 
    conn.setRequestMethod("GET");
    conn.setConnectTimeout(5000);
    conn.setReadTimeout(5000);
 
    int code =
conn.getResponseCode();
    if (code == 200)
{
        InputStream in =
conn.getInputStream();
        String
text =
StrStreamUtils.streamToText(in);
        return text;
    }
else
{
        return
null;
    }
}




public class StrStreamUtils {
    /**
     * 将输入流转成文本
     * @param in
     * @return
     */
    public static String streamToText(InputStream in) {

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        int len = 0;
        byte[] buf = new byte[1024];
        try {
            while ((len = in.read(buf)) != -1) {
                baos.write(buf, 0, len);
            }
            byte[] byteArray = baos.toByteArray();
            return new String(byteArray);
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }
}

2、web端

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

String username = request.getParameter("username");

String password = request.getParameter("password");

username = new String(username.getBytes("iso8859-1"), "utf-8");

System.out.println("用户名：" + URLDecoder.decode(username,"utf-8"));

System.err.println("密码：" + password);

// 模拟查询数据库

if ("hacket".equals(username) && "123456".equals(password)) {

// 返回登陆成功

response.getOutputStream().write("登录成功".getBytes("utf-8"));

} else {

// 返回登陆失败

response.getOutputStream().write("登录失败".getBytes("utf-8"));

}

android：

乱码1：response中的中文，出现的乱码，由于服务器和Android端的编码不一致

服务器：response.getOutputStream().write("登录成功".getBytes("utf-8"));

Android客户端：new String(byteArray);

乱码2：request提交中有中文，出现的乱码

1、服务端：会自动将中文数据url编码

GET /web/LoginServlet?username=%E5%B0%8F%E8%83%9C&password=123456 HTTP/1.1

username = new String(username.getBytes("iso8859-1"), "utf-8"); //但如果直接在浏览器中输入就会有乱码

System.out.println("用户名：" + URLDecoder.decode(username,"utf-8"));

2、android端提交：需要手动写

username = URLEncoder.encode(username, "utf-8");

String path = "http://192.168.221.221:8080/web/LoginServlet?username="+username+"&password="+password;

previous page start next page