接着上篇《Android 采用get方式提交数据到服务器》，本文来实现采用post方式提交数据到服务器
首先对比一下get方式和post方式:
修改布局：
<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=".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="LoginByGet"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="GET方式登录"
/>
<Button
android:onClick="LoginByPost"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="POST方式登录"
/> </LinearLayout>
添加代码：
package com.wuyudong.loginclient; import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL; import android.os.Build;
import android.os.Bundle;
import android.os.StrictMode;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.text.TextUtils;
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; 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); StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy); } public void LoginByGet(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();
} } } /**
* 采用post的方式提交数据到服务器
*
* @param view
*/
public void LoginByPost(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 {
try {
String path = "http://169.254.168.71:8080/web/LoginServlet?username="
+ name + "&password=" + pwd;
// 1.定义请求url
URL url = new URL(path);
// 2.建立一个http的连接
HttpURLConnection conn = (HttpURLConnection) url
.openConnection();
// 3.设置一些请求的参数
conn.setRequestMethod("POST");
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");
conn.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
String data = "username=" + name + "&password=" + pwd;
conn.setRequestProperty("Content-Length", data.length() + "");
conn.setConnectTimeout(5000);//设置连接超时时间
conn.setReadTimeout(5000); //设置读取的超时时间 // 4.一定要记得设置 把数据以流的方式写给服务器
conn.setDoOutput(true); // 设置要向服务器写数据
conn.getOutputStream().write(data.getBytes()); 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();
}
} }
}