Android 使用HttpClient方式提交POST请求

final String username = usernameEditText.getText().toString().trim();        final String password = passwrodEditText.getText().toString().trim();        //Android默认模拟器外部的地址为10.0.2.2，而不是localhost和127.0.0.1        final String serverPath = "http://10.0.2.2:8080/LoginServlet";        if (TextUtils.isEmpty(username) || TextUtils.isEmpty(password)) {            //给出提示：账号密码不许为空        } else {            new Thread(new Runnable() {                @Override                public void run() {                    try {                        //创建浏览器                        HttpClient httpClient = new DefaultHttpClient();                        //创建一个post请求对象                        HttpPost httpPost = new HttpPost(serverPath);                        //创建请求参数                        List<NameValuePair> parameters = new ArrayList<NameValuePair>();                        parameters.add(new BasicNameValuePair("username",username));                        parameters.add(new BasicNameValuePair("password",password));                        //请求参数设置到httpPost的实体里                        httpPost.setEntity(new UrlEncodedFormEntity(parameters, "UTF-8"));                        //浏览器提交这个请求，然后服务器返回一个HttpResponse                        HttpResponse httpResponse = httpClient.execute(httpPost);                        //通过返回信息获取返回的状态码                        int statusCode = httpResponse.getStatusLine().getStatusCode();                        if (200 == statusCode) {                            InputStream inputStream = httpResponse.getEntity().getContent();                            final String responseMsg = StreamTool.getString(inputStream);                            runOnUiThread(new Runnable() {                                @Override                                public void run() {                                    Toast.makeText(MainActivity.this, responseMsg, Toast.LENGTH_LONG).show();                                }                            });                        } else {                            System.out.println("statusCode = " + statusCode);                            //连接服务器出错，错误代码为：responseCode 根据代码值告诉用户出错的原因                            //....                        }                    } catch (Exception e) {                        e.printStackTrace();                    }                }            }).start();        }    }
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