用代码模拟浏览器的行为
* 轻量级的开源的框架
* Android在6.0 23 以后移除了httpclient ,所以开发中用的少了
* 编写步骤：
1. 打开浏览器
2. 输入网址
3. 敲回车
HttpClient中的类：
HttpClient ：想服务器提交数据或者接受服务器返回的数据
NameValuePair ：post方式提交数据的键值对
UrlEncodedFormEntity
：经过form表单编码的数据实体
HttpResponse ：Http响应的
响应头和响应体
StatusLine ：状态行
HttpEntity ：服务器返给客户端的数据实体
GET请求示例代码:
import java.io.InputStream;
import java.net.URLEncoder;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import android.app.Activity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
private EditText etPwd;
private EditText etQQ;
private String pwd;
private String qq;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
etPwd = (EditText) findViewById(R.id.et_pwd);
etQQ = (EditText) findViewById(R.id.et_qq);
}
/**
* 1. 在子线程中进行网络通讯 2. 获取服务器返回的信息 3. 用Handler去展示服务器返回的信息
*/
public void login(View v) {
pwd = etPwd.getText().toString().trim();
qq = etQQ.getText().toString().trim();
if (TextUtils.isEmpty(pwd) || TextUtils.isEmpty(qq)) {
Toast.makeText(this, "亲，请输入QQ号码或者密码！ :) ", 0).show();
return;
}
// 开启子线程
new Thread() {
public void run() {
requestNetWork();
};
}.start();
}
/**
* 网络通信
*/
private void requestNetWork() {
try {
String path = "http://192.168.25.70:8080/web/LoginServlet?" + "qq="
+ URLEncoder.encode(qq) + "&pwd=" + URLEncoder.encode(pwd, "utf-8");
// 1. 打开浏览器
HttpClient client = new DefaultHttpClient();
// 2. 输入网址
HttpGet urlGet = new HttpGet(path);
// 3. 敲回车
HttpResponse response = client.execute(urlGet);
//状态行
StatusLine statusLine = response.getStatusLine();
//状态码
int code = statusLine.getStatusCode();
if (code == 200) {
// * 2xxx 请求成 3xxx重定向 4xxx资源错误 5xxx服务器错误
// 获取服务器返回的二进制输入流
//响应体
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
// 把流转成字符串
String text = StringUtils.parseStream2String(is);
showToast(text);
} else {
showToast(code + "");
}
} catch (Exception e) {
e.printStackTrace();
showToast("服务器忙！");
}
}
/**
* 在任意线程弹土司
*/
public void showToast(final String text) {
this.runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, text, 0).show();
}
});
}
}
POST请求示例代码:
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.app.Activity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
private EditText etPwd;
private EditText etQQ;
private String pwd;
private String qq;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
etPwd = (EditText) findViewById(R.id.et_pwd);
etQQ = (EditText) findViewById(R.id.et_qq);
}
/**
* 1. 在子线程中进行网络通讯
* 2. 获取服务器返回的信息
* 3. 用Handler去展示服务器返回的信息
*/
public void login(View v) {
pwd = etPwd.getText().toString().trim();
qq = etQQ.getText().toString().trim();
if (TextUtils.isEmpty(pwd) || TextUtils.isEmpty(qq)) {
Toast.makeText(this, "亲，请输入QQ号码或者密码！ :) ", 0).show();
return;
}
// 开启子线程
new Thread() {
public void run() {
requestNetWork();
};
}.start();
}
/**
* 网络通信
*/
private void requestNetWork() {
try {
String path = "http://192.168.3.100:8080/web/LoginServlet";
// 1. 打开浏览器
HttpClient client = new DefaultHttpClient();
// 2. 输入网址
HttpPost urlPost = new HttpPost(path);
// String data = "qq="+URLEncoder.encode(qq)+"&pwd="+URLEncoder.encode(pwd, "utf-8");
//要提交的数据
List<NameValuePair> parameters = new ArrayList<NameValuePair>();
parameters.add(new BasicNameValuePair("qq", qq));
parameters.add(new BasicNameValuePair("pwd", pwd));
//经过Url表单编码
UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(parameters,"utf-8");
//设置要提交的数据
urlPost.setEntity(urlEncodedFormEntity);
// 3. 敲回车
HttpResponse response = client.execute(urlPost);
//状态行
StatusLine statusLine = response.getStatusLine();
//状态码
int code = statusLine.getStatusCode();
if (code == 200) {
// * 2xxx 请求成 3xxx重定向 4xxx资源错误 5xxx服务器错误
// 获取服务器返回的二进制输入流
//响应体
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
// 把流转成字符串
String text = StringUtils.parseStream2String(is);
showToast(text);
} else {
showToast(code + "");
}
} catch (Exception e) {
e.printStackTrace();
showToast("服务器忙！");
}
}
/**
* 在任意线程弹土司
*/
public void showToast(final String text) {
this.runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, text, 0).show();
}
});
}
}
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
/**
* 操作字符串
*/
public class StringUtils {
/**
* 从流中转成字符串
* @param is
* 输入流
* @return null表示失败
*/
public static String parseStream2Str(InputStream is) {
//内存输出流
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int len = -1;
byte[] buffer = new byte[1024*8];
try {
while((len = is.read(buffer)) != -1){
baos.write(buffer, 0, len);
}
return new String(baos.toByteArray());
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
}