HttpURLConnection
OkHttp
- 添加依赖
- 编辑 app/build.gradle 在dependencies闭包中添加
implementation 'com.squareup.okhttp3:okhttp:3.11.0'
GET
- OkHttpClient client = new OkHttpClient();//创建Client对象
- Request request = new Request.Builder().url("https://www.baidu.com").build();
- Response response = client.newCall(request).execute();//获取返回数据
- String respnseData=response.body().string();//将返回的数据变成string\、
POST
- OkHttpClient client = new OkHttpClient();//创建Client对象
- RequestBody rb= new FormBody.Builder().add("username","admin").build();
- Request request = new Request.Builder().url("https://www.baidu.com").post(rb).build();
- Response response = client.newCall(request).execute();//获取返回数据
使用okhttp发送请求
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
TextView responseText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = (Button) findViewById(R.id.button);
responseText = (TextView) findViewById(R.id.textView);
button.setOnClickListener(this);
}
@Override
public void onClick(View view) {
if(view.getId()==R.id.button)
{
sendRequestWithOKHttp();
}
}
private void sendRequestWithOKHttp()
{
new Thread(new Runnable() {
@Override
public void run() {
try{
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder().url("https://www.baidu.com").build();
Response response = client.newCall(request).execute();
String respnseData=response.body().string();
showResponse(respnseData);
}
catch (Exception e)
{
e.printStackTrace();
}
}
}).start();
}
private void showResponse(final String response)
{
runOnUiThread(new Runnable() {
@Override
public void run() {
responseText.setText(response);
}
});
}
}
解析XML
Pull解析
private void parseXMLWITHPull (String xmlData)
{
try {
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();//获取实例
XmlPullParser xmlPullParser = factory.newPullParser();
xmlPullParser.setInput(new StringReader(xmlData));//将数据设置进去
int eventType=xmlPullParser.getEventType();//当前解析的事件
String id="";
String name="";
while (eventType!=XmlPullParser.END_DOCUMENT)
{
String nodeName = xmlPullParser.getName();
switch (eventType){
case XmlPullParser.START_TAG:{
if("id".equals(nodeName))
id=xmlPullParser.nextText();
else if ("name".equals(nodeName))
name=xmlPullParser.nextText();
}
break;
case XmlPullParser.END_TAG:
{
if("app".equals(nodeName))
{
Log.d("Main","id is "+id);
Log.d("Main","name is "+name);
}
break;
}
}
eventType=xmlPullParser.next();
}
} catch (Exception e) {
e.printStackTrace();
}
}
解析JSON
JSONObject
private void parseJSONWithJSONObject (String jsonData)
{
try{
JSONArray jsonArray = new JSONArray(jsonData);
for(int i =0 ;i<jsonArray.length();i++)
{
JSONObject jsonObject =jsonArray.getJSONObject(i);
String id = jsonObject.getString("id");
String name = jsonObject.getString("name");
String version = jsonObject.getString("version");
Log.d("Main","id"+id);
Log.d("Main","name"+name);
Log.d("Main","version"+version);
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
GSON
private void parseJSONWithGSON (String jsonData)
{
try{
Gson gson = new Gson();
List appList = gson.fromJson(jsonData,new TypeToken<List>(){}.getType());
for(App app:appList)
{
Log.d("Main","id is"+app.getId());
Log.d("Main","name is"+ app.getName());
Log.d("Main","version is "+ app.getVersion());
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
优化
public class HttpUtil {
public static void sendOkHttpRequest(String address,okhttp3.Callback callback)
{
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder().url(address).build();
client.newCall(request).enqueue(callback);
}
}
创建这个类
使用时
HttpUtil.sendOkHttpRequest("http://545454/get_data.json",new okhttp3.Callback(){
@Override
public void onResponse(Call call, Response response) throws IOException {
String responseData= response.body().string();
parseJSONWithGSON (responseData);
}
@Override
public void onFailure(Call call, IOException e) {
}
});