HttpURLConnection的使用步骤
2021-07-04 15:07
标签：java register lin mission servlet enter 字符 close undle StreamTool.java: 获取数据类：GetData.java: MainActivity.java： 布局：activity_main.xml 最后别忘了加上联网权限：
public class StreamTool {
//从流中读取数据
public static byte[] read(InputStream inStream) throws Exception{
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while((len = inStream.read(buffer)) != -1)
{
outStream.write(buffer,0,len);
}
inStream.close();
return outStream.toByteArray();
}
}
1）HttpURLConnection发送GET请求代码示例
public class GetData {
// 定义一个获取网络图片数据的方法:
public static byte[] getImage(String path) throws Exception {
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
// 设置连接超时为5秒
conn.setConnectTimeout(5000);
// 设置请求类型为Get类型
conn.setRequestMethod("GET");
// 判断请求Url是否成功
if (conn.getResponseCode() != 200) {
throw new RuntimeException("请求url失败");
}
InputStream inStream = conn.getInputStream();
byte[] bt = StreamTool.read(inStream);
inStream.close();
return bt;
}
// 获取网页的html源代码
public static String getHtml(String path) throws Exception {
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5000);
conn.setRequestMethod("GET");
if (conn.getResponseCode() == 200) {
InputStream in = conn.getInputStream();
byte[] data = StreamTool.read(in);
String html = new String(data, "UTF-8");
return html;
}
return null;
}
}
public class MainActivity extends AppCompatActivity {
private TextView txtMenu, txtshow;
private ImageView imgPic;
private WebView webView;
private ScrollView scroll;
private Bitmap bitmap;
private String detail = "";
private boolean flag = false;
private final static String PIC_URL = "http://ww2.sinaimg.cn/large/7a8aed7bgw1evshgr5z3oj20hs0qo0vq.jpg";
private final static String HTML_URL = "http://www.baidu.com";
// 用于刷新界面
private Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case 0x001:
hideAllWidget();
imgPic.setVisibility(View.VISIBLE);
imgPic.setImageBitmap(bitmap);
Toast.makeText(MainActivity.this, "图片加载完毕", Toast.LENGTH_SHORT).show();
break;
case 0x002:
hideAllWidget();
scroll.setVisibility(View.VISIBLE);
txtshow.setText(detail);
Toast.makeText(MainActivity.this, "HTML代码加载完毕", Toast.LENGTH_SHORT).show();
break;
case 0x003:
hideAllWidget();
webView.setVisibility(View.VISIBLE);
webView.loadDataWithBaseURL("", detail, "text/html", "UTF-8", "");
Toast.makeText(MainActivity.this, "网页加载完毕", Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
;
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setViews();
}
private void setViews() {
txtMenu = (TextView) findViewById(R.id.txtMenu);
txtshow = (TextView) findViewById(R.id.txtshow);
imgPic = (ImageView) findViewById(R.id.imgPic);
webView = (WebView) findViewById(R.id.webView);
scroll = (ScrollView) findViewById(R.id.scroll);
registerForContextMenu(txtMenu);
}
// 定义一个隐藏所有控件的方法:
private void hideAllWidget() {
imgPic.setVisibility(View.GONE);
scroll.setVisibility(View.GONE);
webView.setVisibility(View.GONE);
}
@Override
// 重写上下文菜单的创建方法
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
MenuInflater inflator = new MenuInflater(this);
inflator.inflate(R.menu.menus, menu);
super.onCreateContextMenu(menu, v, menuInfo);
}
// 上下文菜单被点击是触发该方法
@Override
public boolean onContextItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.one:
new Thread() {
public void run() {
try {
byte[] data = GetData.getImage(PIC_URL);
bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
} catch (Exception e) {
e.printStackTrace();
}
handler.sendEmptyMessage(0x001);
}
;
}.start();
break;
case R.id.two:
new Thread() {
public void run() {
try {
detail = GetData.getHtml(HTML_URL);
} catch (Exception e) {
e.printStackTrace();
}
handler.sendEmptyMessage(0x002);
};
}.start();
break;
case R.id.three:
if (detail.equals("")) {
Toast.makeText(MainActivity.this, "先请求HTML先嘛~", Toast.LENGTH_SHORT).show();
} else {
handler.sendEmptyMessage(0x003);
}
break;
}
return true;
}
}
2）HttpURLConnection发送POST请求代码示例
PostUtils.java
public class PostUtils { public static String LOGIN_URL = "http://172.16.2.54:8080/HttpTest/ServletForPost"; public static String LoginByPost(String number,String passwd) { String msg = ""; try{ HttpURLConnection conn = (HttpURLConnection) new URL(LOGIN_URL).openConnection(); //设置请求方式,请求超时信息 conn.setRequestMethod("POST"); conn.setReadTimeout(5000); conn.setConnectTimeout(5000); //设置运行输入,输出: conn.setDoOutput(true); conn.setDoInput(true); //Post方式不能缓存,需手动设置为false conn.setUseCaches(false); //我们请求的数据: String data = "passwd="+ URLEncoder.encode(passwd, "UTF-8")+ "&number="+ URLEncoder.encode(number, "UTF-8"); //这里可以写一些请求头的东东... //获取输出流 OutputStream out = conn.getOutputStream(); out.write(data.getBytes()); out.flush(); if (conn.getResponseCode() == 200) { // 获取响应的输入流对象 InputStream is = conn.getInputStream(); // 创建字节输出流对象 ByteArrayOutputStream message = new ByteArrayOutputStream(); // 定义读取的长度 int len = 0; // 定义缓冲区 byte buffer[] = new byte[1024]; // 按照缓冲区的大小，循环读取 while ((len = is.read(buffer)) != -1) { // 根据读取的长度写入到os对象中 message.write(buffer, 0, len); } // 释放资源 is.close(); message.close(); // 返回字符串 msg = new String(message.toByteArray()); return msg; } }catch(Exception e){e.printStackTrace();} return msg; } }
3）使用HttpURLConnection发送PUT请求
public static String LoginByPut(Context mContext, String mobile, String password, int from, String devid,String version_name, int remember_me) { String resp = ""; try { HttpURLConnection conn = (HttpURLConnection) new URL(LOGIN_URL).openConnection(); conn.setRequestMethod("PUT"); conn.setReadTimeout(5000); conn.setConnectTimeout(5000); conn.setDoOutput(true); conn.setDoInput(true); conn.setUseCaches(false); String data = "mobile=" + mobile + "&password=" + password + "&from=" + from + "&devid=" + "devid" + "&version_name=" + "version_name" + "&remember_me=" + remember_me; ; // 获取输出流: OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream()); writer.write(data); writer.flush(); writer.close(); // 获取相应流对象: InputStream in = conn.getInputStream(); BufferedReader reader = new BufferedReader(new InputStreamReader(in)); StringBuilder response = new StringBuilder(); String line; while ((line = reader.readLine()) != null) response.append(line); SPUtils.put(mContext, "session", conn.getHeaderField("Set-Cookie")); // 资源释放: in.close(); // 返回字符串 Log.e("HEHE", response.toString()); return response.toString(); } catch (Exception e) { e.printStackTrace(); } return ""; }
HttpURLConnection的使用步骤
标签：java register lin mission servlet enter 字符 close undle
原文地址：http://www.cnblogs.com/yl-saber/p/7109834.html