【Android】安卓开发之使用Gson和POST请求和服务器通信

一、先看接口文档

url:http://10.15.120.43:8080/APP/Register（假设是这个地址，实际并不是）

请求方式：Http-Post

Content-Type: application/json

请求参数

{ “username”:”用户名”,“password”:”登录密码”}

返回参数

{“code”:”响应状态码”,“msg”: “响应信息”}

二、添加依赖

1、在Android studio 的project的Android视图下，打开build.gradle（Module：app）文件，添加依语句compile 'com.google.code.gson:gson:2.7'

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.1.0'
testCompile 'junit:junit:4.12'
compile 'com.google.code.gson:gson:2.7'
}

2、点击右上角的 Sync now同步文本，然后Android studio 会自动下载Gson2.7，等它下载完就好了。

三、打开网络请求

打开manifests文件夹下的AndroidManifest.xml文件，加上<uses-permission android:name="android.permission.INTERNET"/>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.test">
<uses-permission android:name="android.permission.INTERNET"/>
<application

四、在Java文件夹下新建一个Bean包，包下新建一个CalBean类，CalBean类里的代码如下：

package Bean;

public class CalBean {
private String username;
private String password;

public CalBean(String username,String password) {
this.username = username;
this.password = password;
}

public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}

@Override
public String toString() {
return "CalBean{" + "username=" + username + ", password=" + password +"}";
}
}

五、在注册页的Activity类进行相应设置

/**
* 注册页面2活动
*/
public class RegisterPart2 extends BaseActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.new_register_part2);
//---------------------------给状态栏设置颜色-----------------------------------------------
TextView textViewActionBar = (TextView) findViewById(R.id.actionBarId);
setActionBarColor(textViewActionBar, getResources().getColor(R.color.theRed));
//------------------------------------------------------------------------------------------
final EditText regUserName = (EditText) findViewById(R.id.regist2NameEditId);
final EditText regPassword = (EditText) findViewById(R.id.regist2PasswordEditId);
EditText regConfirm = (EditText) findViewById(R.id.regist2ConfirmEditId);
EditText regEmail = (EditText) findViewById(R.id.regist2EmailEditId);
Button confirmButton = (Button) findViewById(R.id.regist2ConfirmBottonId);

/**
* 完成注册，销毁之前的注册活动，直接跳到登陆界面，且不可返回之前注册活动
*/
confirmButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//---------------------------获取输入的用户名和密码---------------------------------
String name = regUserName.getText().toString();
String password = regPassword.getText().toString();
//----------------------------------------------------------------------------------
//---------------------通过POST请求将用户名和密码发送给服务器-----------------------
try {
//新建一个线程，通过Message消息通知Handle对UI进行更改，现在只能在UI线程里对UI组件进行更改。
new Thread(new Runnable() {
@Override
public void run() {
//下面三句话，将会把三个参数包装为{"para1":10,"para2":2,"opt":"div"}字段
CalBean tb = new CalBean("12345678902","123456");
Gson gson = new Gson();
//传入的参数
String datas = gson.toJson(tb);
String url = " http://10.1.19.43:8080/Register"; String data = sendPostRequest(url, datas);
}
}).start();
} catch (Exception e) {
Log.i("ok", "there must be something wrong!");
return;
}
//----------------------------------------------------------------------------------
Intent intent = new Intent(RegisterPart2.this, Login.class);
startActivity(intent);
ActivityCollector.finishAll();
}
});
}
public static String sendPostRequest(String url, String param) {
HttpURLConnection httpURLConnection = null;
OutputStream out = null; //写
InputStream in = null; //读
int responseCode = 0; //远程主机响应的HTTP状态码
String result = "";
try {
URL sendUrl = new URL(url);
httpURLConnection = (HttpURLConnection) sendUrl.openConnection();
//post方式请求
httpURLConnection.setRequestMethod("POST");
//设置头部信息
httpURLConnection.setRequestProperty("headerdata", "ceshiyongde");
//一定要设置 Content-Type 要不然服务端接收不到参数
httpURLConnection.setRequestProperty("Content-Type", "application/Json; charset=UTF-8");
//指示应用程序要将数据写入URL连接,其值默认为false（是否传参）
httpURLConnection.setDoOutput(true);
//httpURLConnection.setDoInput(true);
httpURLConnection.setUseCaches(false);
httpURLConnection.setConnectTimeout(30000); //30秒连接超时
httpURLConnection.setReadTimeout(30000); //30秒读取超时
//传入参数
out = httpURLConnection.getOutputStream();
out.write(param.getBytes());
out.flush(); //清空缓冲区,发送数据
out.close();
responseCode = httpURLConnection.getResponseCode();
//获取请求的资源
BufferedReader br = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream(), "UTF-8"));
result = br.readLine();
} catch (Exception e) {
e.printStackTrace();
}
Map<String, String> map = new Gson().fromJson(result, new TypeToken<Map<String, String>>(){}.getType());
String msg = map.get("msg");
return msg;
}
}

最后设一个断点看一下效果：