AsyncTask异步上传文本到服务器

服务器代码:用于接收客户端信息

package ches;

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;
@WebServlet("/chess")
public class chess extends HttpServlet {

    
    public chess() {
        super();
    }

    
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
            this.doPost(request, response);
    
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        
            String username = request.getParameter("name");
            String password =  request.getParameter("sex");
            
            System.out.println(username);
            System.out.println(password);
        
    }

}

接下来是android 项目搭建

创建一个异步请求  asyncText类

package com.example.asynctask4;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;

import android.os.AsyncTask;
import android.util.Log;
import android.widget.Toast;

public class asyncText extends AsyncTask{
private static final String Url = "http://192.168.1.37:8080/ches/chess";
private String name,sex;
private MainActivity activity;

private String errorMessage = "";
private String messageInfo = "";

public asyncText(MainActivity activity){
    this.activity= activity;
}
    @Override
    protected Object doInBackground(Object... params) {
        name = (String) params[0];
        sex = (String) params[1];
        
        try {
            URL url = new URL(Url);
            
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        //对连接进行配置
        conn.setDoInput(true);
        conn.setDoOutput(true);
        conn.setUseCaches(false);
        conn.setConnectTimeout(3000);
        conn.setRequestMethod("POST");
    
        
        //获取一个输出流
        OutputStream os = conn.getOutputStream();
        //上传文本数据
        DataOutputStream dos = new DataOutputStream(os);
        dos.writeBytes("name="+URLEncoder.encode(name,"UTF-8")+"&sex="+URLEncoder.encode(sex,"UTF-8"));
        dos.flush();
        dos.close();
        
        if(conn.getResponseCode()==200){
            //输入流
            InputStream is = conn.getInputStream();
            
            //reader（注意UTF-8读）
            InputStreamReader isr = new InputStreamReader(is,"UTF-8");
            //缓冲区，防止读死
            BufferedReader br = new BufferedReader(isr);
            String ReadOneline = null;
            
            //多行数据时，减少不断创建String对象
            StringBuffer sb = new StringBuffer();
            while ( (ReadOneline=br.readLine())!=null ){
                sb.append(ReadOneline);

            }
            br.close();
            isr.close();
            is.close();
            conn.disconnect();
            return sb.toString();
        }else{
            errorMessage = "服务器繁忙，请稍后再试("+conn.getResponseCode()+")";
            return "errorserver";
        }
        } catch (Exception e) {
            Log.i("http", "http执行_获取异常");
            errorMessage = e.getMessage();
            return "errorclient";
        }
        
    }
    @Override
        protected void onPostExecute(Object result) {
            // TODO Auto-generated method stub
        
        if ("errorclient".equals(result)){
            Toast.makeText(activity, "连接不到服务器"+messageInfo, 500).show();
            return;
        }if("errorserver".equals(result)){
            Toast.makeText(activity, "服务器正在维护中"+messageInfo, 500).show();
            return;
        }if("ok".equals(result)){
            Toast.makeText(activity, "注册成功", 500).show();
        }
        
        
            super.onPostExecute(result);
        }
}

MainActivity.java

package com.example.asynctask4;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;


public class MainActivity extends Activity {
    private EditText editText1,editText2;
    private Button button;
    private String name,sex;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        editText1 = (EditText) findViewById(R.id.editText1);
           editText2 = (EditText) findViewById(R.id.editText2);
           button = (Button) findViewById(R.id.button1);
           
           button.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
              name = editText1.getText().toString().trim();
              sex = editText2.getText().toString().trim();
                asyncText as = new asyncText(MainActivity.this);//传值到异步多线程
                as.execute(name,sex);//执行
            }
        });
    }
         
        
}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.asynctask4.MainActivity" >

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="24dp"
        android:ems="10"
        android:inputType="textPersonName" />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText1"
        android:layout_below="@+id/editText1"
        android:layout_marginTop="14dp"
        android:ems="10" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText2"
        android:layout_below="@+id/editText2"
        android:layout_marginLeft="23dp"
        android:layout_marginTop="29dp"
        android:text="上传文本" />

</RelativeLayout>

xmlx效果图：

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还有一点很重要：就是要给联网的权限

<uses-permission android:name="android.permission.INTERNET"/>    【数据联网】
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>【WIFI联网】

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客户端

服务器接收的结果:---------------------------------------------------------------------------------