android客户端与javaweb服务器端数据通信-异步Get

android studio端

package com.example.z_t.mytest3;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserFactory;

import java.io.IOException;
import java.io.StringReader;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class FirstActivity extends AppCompatActivity {
private EditText username;
private EditText password;
private String uname;
private String pwd;
private String result;
private String re;
private boolean res;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_first);

username = (EditText)findViewById(R.id.username);
password = (EditText)findViewById(R.id.password);

Button button = (Button)findViewById(R.id.login);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
uname = username.getText().toString();
pwd = password.getText().toString();
Log.i("First", uname);
Log.i("First", pwd);

getHttp(uname,pwd, new Callback() {
@Override
public void onFailure(Call call, IOException e) {

}

@Override
public void onResponse(Call call, Response response) throws IOException {
String responseData = response.body().string();
int ii =responseData.length();
Log.i("First", responseData);
Log.i("First", String.valueOf(ii));
if (responseData.equals("true")){
res=true;
}else {
res=false;
}
Log.i("First", String.valueOf(res));
runOnUiThread(new Runnable() {
@Override
public void run() {
if (res){
Toast.makeText(FirstActivity.this, "请求成功", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(FirstActivity.this,SecondActivity.class);
startActivity(intent);
}else {
Toast.makeText(FirstActivity.this, "请求失败", Toast.LENGTH_SHORT).show();
}
}
});//回到主线程进行UI操作
}
});//耗时操作都在子线程完成，getHttp方法会在子线程还没执行完得情况下全部执行完，
                   //所以第一次按下登陆时候默认为false,第二次子线程完成才后把布尔值改成true

}
});
}

private void getHttp(String username,String password,okhttp3.Callback callback) {
OkHttpClient client = new OkHttpClient();

String url = "http://192.168.150.1:8080/test2/login?name="+username+"&pwd="+password;
Log.i("First", url);
Request request = new Request.Builder()
.url(url)
.method("GET",null)
.build();
Call call = client.newCall(request);
call.enqueue(callback);

}

private String parseXMLWithPull(String xmlData) {
try{
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
XmlPullParser xmlPullParser = factory.newPullParser();
xmlPullParser.setInput(new StringReader(xmlData));
int eventType = xmlPullParser.getEventType();
while (eventType!=XmlPullParser.END_DOCUMENT){
String nodeName = xmlPullParser.getName();
switch (eventType){
case XmlPullParser.START_TAG:{
if ("td".equals(nodeName)){
result = xmlPullParser.nextText();
}
break;
}
case XmlPullParser.END_TAG:{
if ("tr".equals(nodeName)){
Log.i("First",result);
}
}
default:break;
}
eventType = xmlPullParser.next();
}

}catch (Exception e){
e.printStackTrace();
}
return result;
}

private void postHttp(final String username,final String password){
new Thread(new Runnable() {
@Override
public void run() {
OkHttpClient client = new OkHttpClient();
RequestBody body = new FormBody.Builder()
.add("username",username)
.add("password",password)
.build();
Request request = new Request.Builder()
.url("http://192.168.150.1:8080/test2/login")
.post(body)
.addHeader("content-type","multipart/form-data")
.build();
try {
Response response = client.newCall(request).execute();
String responseData = response.body().string();
Log.i("First",parseXMLWithPull(responseData));

} catch (IOException e) {
e.printStackTrace();
}
}
}).start();

}
}

服务器端package servlet;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONObject;

/**
* Servlet implementation class login
*/
@WebServlet("/login")
public class login extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public login() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String name=request.getParameter("name").trim();
String pwd=request.getParameter("pwd").toString();

response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();

System.out.println("name:"+name+" pwd:"+pwd);
System.out.println(name.length());
if(("aa").equals(name)&&("22").equals(pwd)){
System.out.println("true");
out.print("true");//有换行字符串长度就多2

}else{
System.out.println("false");
}

}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("text/html");

response.setCharacterEncoding("utf-8");
PrintWriter out = resp
4000
onse.getWriter();

String username = request.getParameter("username");
String password = request.getParameter("password");
System.out.println("name:"+username+" pwd:"+password);
if("admin".equals(username)&&"admin".equals(password)){
out.println("<tr>");
out.println("<td>true</td>");
out.println("</tr>");
}else{
out.println("false");
}

}

public static String getRequestBody(HttpServletRequest req) throws IOException {
BufferedReader reader = req.getReader();
String input = null;
StringBuffer requestBody = new StringBuffer();
while((input = reader.readLine()) != null) {
requestBody.append(input);
}
return requestBody.toString();
}

}