get方式和post方式的区别：
1.请求的URL地址不同：
post："http://xx:8080//servlet/LoginServlet"
get：http://xxx:8080//servlet/LoginServlet?username=root&pwd=123
2.请求头不同：
****post方式多了几个请求头：Content-Length , Cache-Control , Origin
openConnection.setRequestProperty("Content-Length", body.length()+"");
openConnection.setRequestProperty("Cache-Control", "max-age=0");
openConnection.setRequestProperty("Origin", "http://192.168.13.83:8080");
****post方式还多了请求的内容：username=root&pwd=123
//设置UrlConnection可以写请求的内容
openConnection.setDoOutput(true);
//获取一个outputstream，并将内容写入该流
openConnection.getOutputStream().write(body.getBytes());
3.请求时携带的内容大小不同
get:1k
post:理论无限制
登录的布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.yb.myapplication.MainActivity">
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/input_username"
android:hint="@string/input_username"/>
<EditText
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:inputType="textPassword"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/input_password"
android:hint="@string/input_password"/>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<CheckBox
android:layout_marginLeft="30dp"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/cb_rem"
android:text="@string/reme_password"/>
<Button
android:layout_marginRight="30dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:layout_alignParentRight="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/bt_login"
android:text="@string/bt_login"/>
</RelativeLayout>
</LinearLayout>
登录的Activity代码
private EditText et_username;
private EditText et_password;
private CheckBox cb_rem;
private Button bt_login;
private Context mcontext;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_get_post);
et_username = (EditText) findViewById(R.id.input_username);
et_password = (EditText) findViewById(R.id.input_password);
cb_rem = (CheckBox) findViewById(R.id.cb_rem);
bt_login = (Button) findViewById(R.id.bt_login);
bt_login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
login();
}
});
//界面加载完回显密码和用户名,读取文件，回显，用户名和密码的封装可以是：数组封装，Map封装，bean封装,
/* Map<String, String> map = UserInfoUtil.getUserInfo(mcontext);
if (map != null) {
String username = map.get("username");
String password = map.get("password");
et_username.setText(username);
et_password.setText(password);
cb_rem.setChecked(true);
}*/
}
public void login() {
final String username = et_username.getText().toString().trim();
final String password = et_password.getText().toString().trim();
final boolean isRem = cb_rem.isChecked();
//判断是否密码或者用户名为空
if (TextUtils.isEmpty(username) || TextUtils.isEmpty(password)) {
Toast.makeText(this, "用户名和密码不能为空", Toast.LENGTH_SHORT).show();
return;
}
//子线程操作，子线程不能做 更新U I
new Thread(new Runnable() {
@Override
public void run() {
//get方法登录是否成功
// final boolean b = requestNetForGetLogin(username, password);
final boolean b = requestNetForPOSTLogin(username, password);
System.out.println("=====================是否登录成功：" + b);
runOnUiThread(new Runnable() { //直接用acitivty类的runOnUiThread(runnable run)方法,可以在子线程中更新UI
@Override
public void run() {
//运行在主线程里了
if (b) {
//判断是否记住密码,要保存到本地，封装成方法
if (isRem) {
//保存用户名和密码
boolean result = UserInfoUtil.saveUserInfo(mcontext, username, password);
if (result) {
Toast.makeText(getApplicationContext(), "用户名和密码保存成功", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "用户名和密码保存失败", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(getApplicationContext(), "登录成功", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(getApplicationContext(), "登录失败", Toast.LENGTH_SHORT).show();
}
}
});
}
}).start();
//请求服务器
}
//get方式登录
private boolean requestNetForGetLogin(String username, String password) {
//urlConnection请求服务器，验证
try {
//1：url对象
URL url = new URL("http://192.168.1.100:8081/servlet/LoginServlet?username=" + username + "&pwd=" + password + "");
//2;url.openconnection
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
//3
conn.setRequestMethod("GET");
conn.setConnectTimeout(10 * 1000);
//4
int code = conn.getResponseCode();
if (code == 200) {
InputStream inputStream = conn.getInputStream();
String result = StreamUtil.stremToString(inputStream);
System.out.println("=====================服务器返回的信息：：" + result);
if (result.contains("success")) {
return true;
}
}
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
//post方式登录
private boolean requestNetForPOSTLogin(String username, String password) {
//urlConnection请求服务器，验证
try {
//1：url对象
URL url = new URL("http://192.168.1.100:8081//servlet/LoginServlet");
//2;url.openconnection
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
//3设置请求参数
conn.setRequestMethod("POST");
conn.setConnectTimeout(10 * 1000);
//请求头的信息
String body="username="+username+"&pwd="+password;
conn.setRequestProperty("Content-Length", String.valueOf(body.length()));
conn.setRequestProperty("Cache-Control","max-age=0");
conn.setRequestProperty("Origin","http://192.168.1.100:8081");
//设置conn可以写请求的内容
conn.setDoOutput(true);
conn.getOutputStream().write(body.getBytes());
//4响应码
int code = conn.getResponseCode();
if (code == 200) {
InputStream inputStream = conn.getInputStream();
String result = StreamUtil.stremToString(inputStream);
System.out.println("=====================服务器返回的信息：：" + result);
if (result.contains("success")) {
return true;
}
}
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
新建一个工具包Util, 新建一个类UserInfoUtil
public class UserInfoUtil {
public static boolean saveUserInfo(Context context, String username, String password) {
//需要使用shrare10.sharedPreference的使用
try {
//1使用Context创建一个SharePerference对象
SharedPreferences sharedPreferences = context.getSharedPreferences("userinfo.txt", Context.MODE_PRIVATE);
//2SharePerference对象得到Editor对象
Editor edit = sharedPreferences.edit();
//3往Editor对象里面添加数据
edit.putString("username",username);
edit.putString("password",password);
//4提交Editor对象
edit.commit();
return true;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
//用户名和密码的封装可以是：数组封装，Map封装，bean封装,这里采用map封装
public static Map<String, String> getUserInfo(Context context) {
try {
//1 使用Context创建一个SharePerference对象
SharedPreferences sharedPreferences = context.getSharedPreferences("userinfo.txt", Context.MODE_PRIVATE);
//2SharePerference对象获取存放的数据
String username = sharedPreferences.getString("username", "");
String password = sharedPreferences.getString("password", "");
HashMap<String, String> hashMap = new HashMap<String, String>();
hashMap.put("username", username);
hashMap.put("password", password);
return hashMap;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
新建工具类StreamUtil,把获取的读取流转为String返回
public class StreamUtil {
/**
* 获取的读取流转为String返回
*
* @param inputStream
*/
public static String stremToString(InputStream in) {
String result="";
try {
//创建一个字节数组写入流
ByteArrayOutputStream out=new ByteArrayOutputStream();
byte[] buffer=new byte[1024];
int length=0;
while((length=in.read(buffer))!=-1){ //如果返回-1 则表示数据读取完成了。
out.write(buffer,0,length);//写入数据
out.flush();
}
result=out.toString();//写入流转为字符串
out.close();
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
}
时间： 2024-10-26 10:26:19