32.Android端向web端(服务器)提交数据（GET-POST-AsyncHttpClient）
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2024-01-19 17:07:58
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一.使用Eclipse的web服务端（先写web服务端Android端才能调）
login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>登录</title>
</head>
<body>
<h1>登录页面</h1>
<form action="login.do" method="get">
用户名：<input type="text" name="uname"/><br/>
密码：<input type="password" name="upass"/><br/>
<input type="submit" value="登录"/><br/>
</form>
</body>
</html>
package com.zking.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginServlet extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html; charset=UTF-8");
//获取用户名和密码
String uname=req.getParameter("uname");
String upass=req.getParameter("upass");
System.out.println(uname+" "+upass);//测试
String result=null;//定义一个结果字符串
//判断
if("admin".equals(uname) && "123".equals(upass)){
result="成功success!";
}else{
result="失败fail!";
}
//在页面上打印
PrintWriter pw=resp.getWriter();
pw.write(result);
pw.close();
}
}
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>ServerForAndroid</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>loginServlet</servlet-name>
<servlet-class>com.zking.servlet.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>loginServlet</servlet-name>
<url-pattern>/login.do</url-pattern>
</servlet-mapping>
</web-app>技术1：登录(用Get方式提交)
Url路径
技术2：登录(用POST方式提交)
注：web端改为post提交方式
技术3：登录(用第三方AsyncHttpClient)
导jar包:android-async-http-1.4.4.jar
HttpClient导致不可以问题：
useLibrary 'org.apache.http.legacy'（案例）android端具体代码实现如下:
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入用户名"
android:id="@+id/et_main_uname"
/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入密码"
android:id="@+id/et_main_upass"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="登录(GET)"
android:onClick="loginGet"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="登录(Post)"
android:onClick="loginPost"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="登录(AsyncHttpClient)"
android:onClick="loginAsyncHttpClient"
/>
</LinearLayout>
清单文件AndroidManifest.xml
<!--权限-->
<uses-permission android:name="android.permission.INTERNET"></uses-permission>MainActivity.java
package com.zking.android32_commitdata;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.RequestParams;
import com.loopj.android.http.TextHttpResponseHandler;
import org.apache.http.Header;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
public class MainActivity extends AppCompatActivity {
private EditText et_main_uname;
private EditText et_main_upass;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et_main_uname = (EditText) findViewById(R.id.et_main_uname);
et_main_upass = (EditText) findViewById(R.id.et_main_upass);
}
public void loginGet(View view){
String uname=et_main_uname.getText().toString();//一点击登录就拿用户名及密码
String upass=et_main_upass.getText().toString();
//拿Eclipse里面的业务逻辑路径9(cmd查ip地址，把localhost改为ip地址)
String path="http://192.168.43.163:8080/ServerForAndroid/login.do";
new MyGetTask().execute(uname,upass,path);//调方法
}
class MyGetTask extends AsyncTask {
@Override
protected Object doInBackground(Object[] params) {//专门拿数据
String uname=params[0].toString();
String upass=params[1].toString();
String path=params[2].toString();
try {
URL url=new URL(path+"?uname="+uname+"&upass="+upass);
HttpURLConnection connection= (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");//设置请求方式
connection.setConnectTimeout(5000);
if(connection.getResponseCode()==200){//判断结果码
InputStream is=connection.getInputStream();//字节流
BufferedReader br=new BufferedReader(new InputStreamReader(is));//一行一行读(字节流转字符流)
String s=br.readLine();
return s;
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Object o) {
super.onPostExecute(o);
String s= (String) o;
Toast.makeText(MainActivity.this, s, Toast.LENGTH_SHORT).show();
}
}
public void loginPost(View view){
String uname=et_main_uname.getText().toString();
String upass=et_main_upass.getText().toString();
String path="http://192.168.43.163:8080/ServerForAndroid/login.do";
new MyPostTask().execute(uname,upass,path);//调方法
}
class MyPostTask extends AsyncTask{
@Override
protected Object doInBackground(Object[] params) {
String uname=params[0].toString();
String upass=params[1].toString();
String path=params[2].toString();
try {
URL url=new URL(path);
HttpURLConnection conn= (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setConnectTimeout(5000);//超时时间
//admin 123长度21，因为（uname=admin&upass=123）
String s="uname="+uname+"&upass="+upass;
//添加请求头
conn.setRequestProperty("Content-Length",s.length()+"");
conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
conn.setDoOutput(true);//允许对外输出数据
OutputStream os=conn.getOutputStream();//写数据OutputStream
os.write(s.getBytes());//把数据传递给服务器了
if(conn.getResponseCode()==200){//拿到返回结果
InputStream is=conn.getInputStream();
BufferedReader br=new BufferedReader(new InputStreamReader(is));
String str=br.readLine();
return str;
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Object o) {
super.onPostExecute(o);
String s= (String) o;
Toast.makeText(MainActivity.this,s, Toast.LENGTH_SHORT).show();
}
}
public void loginAsyncHttpClient(View view){
String uname=et_main_uname.getText().toString();
String upass=et_main_upass.getText().toString();//值
String path="http://192.168.43.163:8080/ServerForAndroid/login.do";
//导jar包
AsyncHttpClient ahc=new AsyncHttpClient();
RequestParams params=new RequestParams();
params.put("uname",uname);//把用户名密码给了它("键:必须和服务器保持一致",值:与上面一样)
params.put("upass",upass);
ahc.post(this,path,params,new TextHttpResponseHandler(){
//Ctrl+O重写方法
@Override
public void onFailure(int statusCode, Header[] headers, String responseBody, Throwable error) {
super.onFailure(statusCode, headers, responseBody, error);
}
@Override
public void onSuccess(int statusCode, Header[] headers, String responseBody) {
super.onSuccess(statusCode, headers, responseBody);
Toast.makeText(MainActivity.this, responseBody, Toast.LENGTH_SHORT).show();
}
});
}
}
效果图:
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