Android向服务器提交数据

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首先我们先来写服务器，这里就用登录来演示效果
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>Insert title here</title></head><body><body>    <form action="loginResult.xhtml" method="post">        Uname:<input type="text" name="uname"/><br/>        Upass:<input type="text" name="upass"/><br/>        <input type="submit" value="登录"/><br/>    </form></body></body></html>

LoginController

    @RequestMapping("loginResult.xhtml")    public String loginResult(HttpServletRequest request){        String name = request.getParameter("uname");        String pass = request.getParameter("upass");        String result=null;        //判断数据库        if("admin".equals(name)&&"123456".equals(pass)){            result="success";        }else{            result="fail";        }        request.setAttribute("result", result);        return "loginResult";    }    @RequestMapping("login.xhtml")    public String login(HttpServletRequest request){        return "login";    }

loginResult.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"    pageEncoding="ISO-8859-1"%><!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=ISO-8859-1"><title>Insert title here</title></head><body>${result }</body></html>

为了节约时间就不跑数据库了，用户密码直接写死

效果图
这里写图片描述

这里输入用户名admin，密码123456，返回的结果是success，错误则返回fail。

服务器写好了，接下来我们要在客户端（安卓）向服务器（WEB）提交用户名和密码，然后返回对应的结果

直接上代码，先是布局文件
activity_main.xml

<?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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:orientation="vertical"    tools:context="com.zy.commitdatatoserver.MainActivity">    <EditText        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="admin"        android:id="@+id/et_main_uname"        />    <EditText        android:id="@+id/et_main_upass"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="123456" />    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:onClick="loginByGet"        android:text="登录(GET)" />    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:onClick="loginByPost"        android:text="登录(POST)" /></LinearLayout>

我们是向服务器提交数据，所以需要联网的权限。

 <uses-permission android:name="android.permission.INTERNET"></uses-permission>

MainActivity

import android.os.AsyncTask;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.EditText;import android.widget.Toast;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;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 loginByGet(View view) {        String uname = et_main_uname.getText().toString();        String upass = et_main_upass.getText().toString();        String path = "http://192.168.42.253:8090/front/loginResult.xhtml";        //可变数组        new MyTask().execute(uname, upass, path, "GET");    }    public void loginByPost(View view) {        String uname = et_main_uname.getText().toString();        String upass = et_main_upass.getText().toString();        String path = "http://192.168.42.253:8090/front/loginResult.xhtml";        //可变数组        new MyTask().execute(uname, upass, path, "POST");    }    class MyTask extends AsyncTask {        private HttpURLConnection connection;        private URL url;        @Override        protected Object doInBackground(Object[] objects) {            //获取参数的值            String uname = objects[0].toString();            String upass = objects[1].toString();            String path = objects[2].toString();            String type = objects[3].toString();            String str="uname="+uname+"&upass="+upass;            try {                if ("GET".equals(type)) {                    //用GET方式提交                    path = path + "?"+str;                    url = new URL(path);                    connection =  (HttpURLConnection) url.openConnection();                    connection.setRequestMethod(type);                } else if ("POST".equals(type)) {                    //用POST方式提交                    url = new URL(path);                    connection =  (HttpURLConnection) url.openConnection();                    connection.setRequestMethod(type);                    //设置contentType  contentLength                    connection.setRequestProperty("Content-Length",str.length()+"");                    connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");                    //设置允许对外输出数据                    connection.setDoOutput(true);                    //将用户名和密码提交到服务器                    connection.getOutputStream().write(str.getBytes());                }                connection.setConnectTimeout(5000);                if (connection.getResponseCode() == 200) {                    InputStream is = connection.getInputStream();                    BufferedReader br = new BufferedReader(new InputStreamReader(is));                    String result = br.readLine();                    return result;                }            } 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();        }    }}

GET和POST的提交方式最大的区别就在于GET是地址栏传参，而POST需要加入
//设置contentType contentLength
connection.setRequestProperty(“Content-Length”,str.length()+”“);
connection.setRequestProperty(“Content-Type”,”application/x-www-form-urlencoded”);
这两行代码来设置内容类型与长度

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