你的位置:首页 > 操作系统

[操作系统]Android 采用get方式提交数据到服务器


首先搭建模拟web 服务器,新建动态web项目,servlet代码如下:

package com.wuyudong.web;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.catalina.User;/** * Servlet implementation class LoginServlet */@WebServlet("/LoginServlet")public class LoginServlet extends HttpServlet {  private static final long serialVersionUID = 1L;  /**   * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse   *   response)   */  protected void doGet(HttpServletRequest request,      HttpServletResponse response) throws ServletException, IOException {    String username = request.getParameter("username");    String password = request.getParameter("password");    System.out.println("用户名:" + username);    System.out.println("用户名:" + password);    if ("wuyudong".equals(username) && "123".equals(password)) {      response.getOutputStream().write("login success".getBytes());    } else {      response.getOutputStream().write("login failed".getBytes());    }  }  /**   * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse   *   response)   */  protected void doPost(HttpServletRequest request,      HttpServletResponse response) throws ServletException, IOException {    // TODO Auto-generated method stub  }}

再新建一个jsp页面

<%@ 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>登录页面</title></head><body>  <form action="LoginServlet" method="get">    用户名:<input name="username" type="text"><br> 密码:<input      name="password" type="password"><br> <input      type="submit">  </form></body></html>

新建android项目,页面布局:

<LinearLayout ="http://schemas.android.com/apk/res/android"  ="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical"  tools:context=".MainActivity" >  <EditText    android:id="@+id/et_name"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:hint="请输入用户名"    android:inputType="text" />  <EditText    android:id="@+id/et_pwd"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:hint="请输入密码"    android:inputType="textPassword" />  <Button     android:onClick="login"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:text="登录"    /></LinearLayout>

代码如下:

package com.wuyudong.loginclient;import java.io.ByteArrayOutputStream;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import android.os.Bundle;import android.app.Activity;import android.text.Editable;import android.text.TextUtils;import android.view.Menu;import android.view.View;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity {  private EditText et_name;  private EditText et_pwd;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    et_name = (EditText) findViewById(R.id.et_name);    et_pwd = (EditText) findViewById(R.id.et_pwd);  }  public void login(View view) {    String name = et_name.getText().toString().trim();    String pwd = et_pwd.getText().toString().trim();    if (TextUtils.isEmpty(name) || TextUtils.isEmpty(pwd)) {      Toast.makeText(this, "用户名密码不能为空", 0).show();    } else {      // 模拟http请求,提交数据到服务器      String path = "http://169.254.168.71:8080/web/LoginServlet?username="          + name + "&password=" + pwd;      try {        URL url = new URL(path);        // 2.建立一个http连接        HttpURLConnection conn = (HttpURLConnection) url            .openConnection();        // 3.设置一些请求方式        conn.setRequestMethod("GET");// 注意GET单词字幕一定要大写        conn.setRequestProperty(            "User-Agent",            "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36");        int code = conn.getResponseCode(); // 服务器的响应码 200 OK //404 页面找不到                          // // 503服务器内部错误        if (code == 200) {          InputStream is = conn.getInputStream();          // 把is的内容转换为字符串          ByteArrayOutputStream bos = new ByteArrayOutputStream();          byte[] buffer = new byte[1024];          int len = -1;          while ((len = is.read(buffer)) != -1) {            bos.write(buffer, 0, len);          }          String result = new String(bos.toByteArray());          is.close();          Toast.makeText(this, result, 0).show();        } else {          Toast.makeText(this, "请求失败,失败原因: " + code, 0).show();        }      } catch (Exception e) {        e.printStackTrace();        Toast.makeText(this, "请求失败,请检查logcat日志控制台", 0).show();      }    }  }}

添加权限:android.permission.INTERNET

运行项目后点击按钮后提示错误:

06-18 21:08:16.237: W/System.err(7417): android.os.NetworkOnMainThreadException

android强行让4.0以后的版本不去检查主线程访问网络。

解决办法,可以在onCreate里面加上下面这段代码:

StrictMode.ThreadPolicy policy=new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);

搞定