使用HttpURLConnection采用get方式请求数据-----乱码问题

来源：互联网发布：淘宝直通车报名条件编辑：程序博客网时间：2024/06/10 01:26

1．在子线程中改变ui，用handle通信，还可以用

// 执行任务在主线程中，除handle外    runOnUiThread(new Runnable() {@Overridepublic void run() {// 就是在主线程中操作Toast.makeText(MainActivity.this, state, 0).show();}}

2. ******根据流返回一个字符串；代码---

3. 添加权限Internet

4. 乱码问题：

MyEclipse:默认采用的是iso8859-1

模拟器默认采用的是utf-8

4. 服务器方面：

public void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{String username =request.getParameter(“username”);//采用的编码是iso8859-1String password =request.getParameter(“password”);//采用iso8859-1的编码对姓名进行逆转，转换成字节数组，再使用utf-8编码对数据进//行转换成字符串username=new String(username.getBytes(“iso8859-1”),”utf-8”);password=new String(password.getBytes(“iso8859-1”),”utf-8”);If(“李四”.equals(username)&&”123”.equals(password)){//getBytes默认情况下，使用的iso8859-1的编码，但如果发现码表中没有当前字符，会//使用当前系统的默认编码：GBK  Response.getOutputStream().write(“登陆成功”.getBytes());}else{Response.getOutputStream().write(“登陆失败”.getBytes());}}

5.客户端访问：localhost:8080/ServerItheima28/servlet/LoginServlet?username=lisi&password=123

6.代码

public class MainActivity extends Activity {private EditText etUserName;private EditText etPassword;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);etUserName = (EditText) findViewById(R.id.et_username);etPassword = (EditText) findViewById(R.id.et_password);}public void doGet(View v) {final String userName = etUserName.getText().toString();final String password = etPassword.getText().toString();new Thread(new Runnable() {@Overridepublic void run() {// 使用get方式抓去数据，返回登陆结果final String state = NetUtils.loginOfGet(userName, password);// 执行任务在主线程中，除handle外runOnUiThread(new Runnable() {@Overridepublic void run() {// 就是在主线程中操作Toast.makeText(MainActivity.this, state, 0).show();}});}}).start();}

loginOfGet方法：

public class NetUtils {/** * 使用get的方式登录 * @param userName * @param password * @return 登录的状态 */public static String loginOfGet(String userName, String password) {HttpURLConnection conn = null;try {String data = "username=" + URLEncoder.encode(userName) + "&password=" + URLEncoder.encode(password);URL url = new URL("http://10.0.2.2:8080/ServerItheima28/servlet/LoginServlet?" + data);conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("GET");// get或者post必须得全大写conn.setConnectTimeout(10000); // 连接的超时时间conn.setReadTimeout(5000); // 读数据的超时时间int responseCode = conn.getResponseCode();if(responseCode == 200) {InputStream is = conn.getInputStream();String state = getStringFromInputStream(is);return state;} else {Log.i(TAG, "访问失败: " + responseCode);}} catch (Exception e) {e.printStackTrace();} finally {if(conn != null) {conn.disconnect();// 关闭连接}}return null;}/** * 根据流返回一个字符串信息 * @param is * @return * @throws IOException  */private static String getStringFromInputStream(InputStream is) throws IOException {ByteArrayOutputStream baos = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = -1;while((len = is.read(buffer)) != -1) {baos.write(buffer, 0, len);}is.close();String html = baos.toString();// 把流中的数据转换成字符串, 采用的编码是: utf-8//String html = new String(baos.toByteArray(), "GBK");baos.close();return html;}}

0 0