安卓基础干货(五)：安卓线程与数据上传下载的学习

使用POST方式提交数据时的中文乱码解决方法（重点）

解决办法：使用客户端和服务器两边的字符集编码保持一致。
UTF-8，

使用GET方式提交数据的中文乱码的解决方法

使用URLEncoder.encode(name,"UTF-8")进行url编码：
String path = "http://192.168.22.136:8080/web/servlet/LoginServlet?username="+URLEncoder.encode(name,"UTF-8")+"&password="+URLEncoder.encode(pwd,"UTF-8");

使用httpclient提交数据（重点）

apache httpClient 轻量级的浏览器：

• 使用GET方式数据步骤：

  1、创建一个浏览器：

  2、输入一个网址：

  3、敲回车

模块代码：

package com.itheima.qqlogin;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import com.itheima.htmlview.utils.StreamTools;

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 et_name;

private EditText et_pwd;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

et_name = (EditText) findViewById(R.id.et_name);

et_pwd = (EditText) findViewById(R.id.et_pwd);

}

public void login(View view){
final String name = et_qq.getText().toString().trim();

final String pwd = et_pwd.getText().toString().trim();

if(TextUtils.isEmpty(name) || TextUtils.isEmpty(pwd)){
Toast.makeText(this, "qq和密码不能空", 0).show();
return;
}else{
new Thread(){

public void run() {

try {
String path = "http://192.168.22.136:8080/web/servlet/LoginServlet?username="+URLEncoder.encode(name,"UTF-8")+"&password="+URLEncoder.encode(pwd,"UTF-8");

//
// 1、创建一个浏览器：
HttpClient client = new DefaultHttpClient();
// 2、输入一个网址：
HttpGet httpGet = new HttpGet(path);
//
// 3、敲回车
HttpResponse response = client.execute(httpGet);
//获取服务器端返回的响应码（状态码）
int code = response.getStatusLine().getStatusCode();
// int code = conn.getResponseCode();
if(code == 200){
// 4、解析服务器返回的二进制数据，解析成一个字符串
// InputStream is = conn.getInputStream();
//获取服务器返回的二进制数据流
InputStream is = response.getEntity().getContent();

String result = StreamTools.readStream(is);
System.out.println("---------"+ result);
}

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

}

• 使用post方式向服务器端提交数据

  1、创建一个浏览器：

  2、输入一个网址：

  3、敲回车

模版代码：

package com.itheima.qqlogin;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
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.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import com.itheima.htmlview.utils.StreamTools;

public class MainActivity extends Activity {

private EditText et_qq;

private EditText et_pwd;

private Handler handler = new Handler(){
public void handleMessage(android.os.Message msg) {

String result = (String) msg.obj;

Toast.makeText(MainActivity.this, result, 0).show();
};
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

et_qq = (EditText) findViewById(R.id.et_qq);

et_pwd = (EditText) findViewById(R.id.et_pwd);

}

public void login(View view){
final String name = et_qq.getText().toString().trim();

final String pwd = et_pwd.getText().toString().trim();

if(TextUtils.isEmpty(name) || TextUtils.isEmpty(pwd)){
Toast.makeText(this, "qq和密码不能空", 0).show();
return;
}else{
new Thread(){

public void run() {

try {
String path = "http://192.168.1.196:8080/web/servlet/LoginServlet";
// String data = "username="+name+"&password="+pwd;

String data = "username="+URLEncoder.encode(name,"UTF-8")+"&password="+URLEncoder.encode(pwd,"UTF-8");

// 1、创建一个浏览器：

HttpClient client = new DefaultHttpClient();
// 2、输入一个网址：
HttpPost httpPost = new HttpPost(path);
List parameters = new ArrayList();

BasicNameValuePair p1 = new BasicNameValuePair("username", name);

BasicNameValuePair p2 = new BasicNameValuePair("password", pwd);
parameters.add(p1);
parameters.add(p2);
//默认使用iso-8859-1编码，需要指定UTF-8
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(parameters,"UTF-8");

// 3、敲回车
//设置提交的数据
httpPost.setEntity(entity);
HttpResponse response = client.execute(httpPost);

// 4、服务器返回数据
// （1）判断状态码：200 ok，404 没有找到资源、503、509 服务器端错误
int code = response.getStatusLine().getStatusCode();
// int code = conn.getResponseCode();
if(code == 200){
// (2）解析服务器返回的二进制数据，解析成一个字符串
InputStream is = response.getEntity().getContent();
String result = StreamTools.readStream(is);
System.out.println("---------"+ result);

Message msg = Message.obtain();
msg.obj = result;
handler.sendMessage(msg);
}

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

}

使用Aynchttpclient向服务器端提交数据（重点）

1、创建一个浏览器：

2、输入一个网址：

3、敲回车

• 使用GET方式向服务器端提交数据

  package com.itheima.qqlogin;

  import java.io.InputStream;
  import java.net.HttpURLConnection;
  import java.net.URL;
  import java.net.URLEncoder;

  import org.apache.http.Header;

  import com.itheima.htmlview.utils.StreamTools;
  import com.loopj.android.http.AsyncHttpClient;
  import com.loopj.android.http.AsyncHttpResponseHandler;

  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 et_name;

  private EditText et_name;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  et_qq = (EditText) findViewById(R.id.et_qq);

  et_pwd = (EditText) findViewById(R.id.et_pwd);

  }

  public void login(View view){
  final String name = et_qq.getText().toString().trim();

  final String pwd = et_pwd.getText().toString().trim();

  if(TextUtils.isEmpty(name) || TextUtils.isEmpty(pwd)){
  Toast.makeText(this, "qq和密码不能空", 0).show();
  return;
  }else{
  try {
  String path = "http://192.168.1.103:8080/web/servlet/LoginServlet?username="+URLEncoder.encode(name,"UTF-8")+"&password="+URLEncoder.encode(pwd,"UTF-8");
  //1、创建一个浏览器：
  AsyncHttpClient client = new AsyncHttpClient();
  //2、输入网址，调用get方式向服务器发送请求：
  client.get(path, new AsyncHttpResponseHandler() {

  /*
  * 请求成功，服务器端正常响应 响应码200
  * statusCode 响应码200ok，404没有找到资源，503服务器内部错误, Header[] headers 响应头信息, byte[] responseBody 服务器返回的数据
  */
  @Override
  public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
  Toast.makeText(MainActivity.this, new String(responseBody), 0).show();
  }

  /*
  * 请求成功，服务器端正常响应 响应码200
  * int statusCode, Header[] headers, byte[] responseBody, Throwable error
  * statusCode 响应码200ok，404没有找到资源，503服务器内部错误, Header[] headers 响应头信息, byte[] responseBody 服务器返回的数据
  * Throwable error 服务器端返回的异常
  */
  @Override
  public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable arg3) {
  Toast.makeText(MainActivity.this, new String(responseBody), 0).show();
  }
  });
  } catch (Exception e) {
  e.printStackTrace();
  }
  };

  }
  }

• 使用POST方式向服务器端提交数据

  package com.itheima.qqlogin;
  import java.io.InputStream;
  import java.io.UnsupportedEncodingException;
  import java.net.HttpURLConnection;
  import java.net.URL;
  import java.net.URLEncoder;

  import org.apache.http.Header;

  import android.app.Activity;
  import android.os.Bundle;
  import android.os.Handler;
  import android.os.Message;
  import android.text.TextUtils;
  import android.view.View;
  import android.widget.EditText;
  import android.widget.Toast;

  import com.itheima.htmlview.utils.StreamTools;
  import com.loopj.android.http.AsyncHttpClient;
  import com.loopj.android.http.AsyncHttpResponseHandler;
  import com.loopj.android.http.RequestParams;

  public class MainActivity extends Activity {

  private EditText et_qq;

  private EditText et_pwd;

  private Handler handler = new Handler(){
  public void handleMessage(android.os.Message msg) {

  String result = (String) msg.obj;

  Toast.makeText(MainActivity.this, result, 0).show();
  };
  };
  @Override
  protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  et_qq = (EditText) findViewById(R.id.et_qq);

  et_pwd = (EditText) findViewById(R.id.et_pwd);

  }

  public void login(View view){
  final String name = et_qq.getText().toString().trim();

  final String pwd = et_pwd.getText().toString().trim();

  if(TextUtils.isEmpty(name) || TextUtils.isEmpty(pwd)){
  Toast.makeText(this, "qq和密码不能空", 0).show();
  return;
  }else{
  try {
  String path = "http://192.168.22.136:8080/web/servlet/LoginServlet";
  // String data = "username="+name+"&password="+pwd;

  // String data = "username="+URLEncoder.encode(name,"UTF-8")+"&password="+URLEncoder.encode(pwd,"UTF-8");
  // 1、创建一个浏览器：
  AsyncHttpClient client = new AsyncHttpClient();
  // 2、输入一个网址,敲回车：
  RequestParams params = new RequestParams();
  params.put("username", name);
  params.put("password", pwd);

  client.post(path, params, new AsyncHttpResponseHandler() {

  @Override
  public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
  Toast.makeText(MainActivity.this, new String(responseBody), 0).show();

  }

  @Override
  public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable e) {
  Toast.makeText(MainActivity.this, new String("服务器端返回数据失败"), 0).show();
  }
  });
  } catch (Exception e) {
  e.printStackTrace();
  }
  }
  }
  }

多线程下载的原理

javase实现多线程

步骤：

1、在客户端创建一个与服务器端大小一样的空白文件
2、设置子线程的个数
3、计算每个子线程下载的数据块大小和下载起始位置、结束位置
4、创建子线程开始下载数据
5、得到每个子线程都下载完成的标记

代码：
MultiThreadDownLoader.java:

import java.io.RandomAccessFile;
import java.net.HttpURLConnection;
import java.net.URL;

public class MultiThreadDownLoader {

//2、使用的子线程的个数
private static int threadCount =3;

/**
* @param args
*/
public static void main(String[] args) {
try {
String path = "http://192.168.22.136:8080/sogou.exe";
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(3000);

int code = conn.getResponseCode();
if(code == 200){
int length = conn.getContentLength();
//1、在客户端创建一个与服务端文件一样大小的文件
RandomAccessFile file = new RandomAccessFile("temp.exe", "rw");
file.setLength(length);
//3、每个子线程下载数据块 ,下载的起始位置和结束位置
int blockSize = length/threadCount;

// threadId * blockSize ---- （threadId+1）* blockSize -1
for(int threadId =0; threadId < threadCount; threadId++){
//下载的起始位置和结束位置
int startIndex = threadId * blockSize;
int endIndex = 0;

if(threadId != (threadCount -1)){
endIndex = (threadId + 1) * blockSize - 1;
}else{
endIndex = length-1;
}

//开启子线程下载数据
new ThreadDownLoader(path, startIndex, endIndex, threadId, threadCount).start();

}

}else{
//抛出异常
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

ThreadDownLoader.java:

import java.io.InputStream;
import java.io.RandomAccessFile;
import java.net.HttpURLConnection;
import java.net.URL;

public class ThreadDownLoader extends Thread {

private String path;
private int startIndex;
private int endIndex;
private int threadId;
private int threadCount;
//正在运行的线程个数
private static int runningThreadCount = 3;
ThreadDownLoader(String path,int startIndex,int endIndex,int threadId,int threadCount){
this.path = path;
this.startIndex = startIndex;
this.endIndex = endIndex;
this.threadId = threadId;
this.threadCount = threadCount;

}

@Override
public void run() {
downLoad(path,startIndex,endIndex,threadId,threadCount);
}

public void downLoad(String path,int startIndex,int endIndex,int threadId,int threadCount)
{
try {
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setRequestMethod("GET");
conn.setConnectTimeout(3000);
//设置子线程请求数据的范围
conn.setRequestProperty("Range", "bytes="+startIndex+"-"+endIndex);
int code = conn.getResponseCode();
if(code == 206){//请求部分数据

InputStream is = conn.getInputStream();
RandomAccessFile file = new RandomAccessFile("temp.exe","rw");
//指定从哪个位置开始写数据
file.seek(startIndex);

byte[] buffer = new byte[1024];
int len = -1;
while((len = is.read(buffer)) != -1){
file.write(buffer, 0, len);
}

file.close();
System.out.println("线程"+threadId+"下载完成...............");
synchronized (ThreadDownLoader.this) {
runningThreadCount--;
if(runningThreadCount == 0){
System.out.println("文件下载完成...............");
}
}
}
} catch (Exception e) {
System.out.println("线程"+threadId+"下载失败...............");
e.printStackTrace();
}

}

}

断点续传下载

1、实时记录线程下载的位置；

2、接上一次下载的位置继续下载；

代码：

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.channels.ReadableByteChannel;

public class ThreadDownLoader extends Thread {

private String path;
private int startIndex;
private int endIndex;
private int threadId;
private int threadCount;
//正在运行的线程个数
private static int runningThreadCount = 3;
ThreadDownLoader(String path,int startIndex,int endIndex,int threadId,int threadCount){
this.path = path;
this.startIndex = startIndex;
this.endIndex = endIndex;
this.threadId = threadId;
this.threadCount = threadCount;

}

@Override
public void run() {
downLoad(path,startIndex,endIndex,threadId,threadCount);
}
public void downLoad(String path,int startIndex,int endIndex,int threadId,int threadCount){
try {
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setRequestMethod("GET");
conn.setConnectTimeout(3000);

//获取上一次下载的位置，接着下载
File threadFile = new File(threadId+".txt");
if(threadFile.exists() && threadFile.length() > 0){
FileReader fr = new FileReader(threadFile);
BufferedReader br = new BufferedReader(fr);
String position = br.readLine();
//设置子线程请求数据的范围
conn.setRequestProperty("Range", "bytes="+position+"-"+endIndex);
startIndex = Integer.valueOf(position);
}else{
//设置子线程请求数据的范围
conn.setRequestProperty("Range", "bytes="+startIndex+"-"+endIndex);
}

int code = conn.getResponseCode();
if(code == 206){//请求部分数据

InputStream is = conn.getInputStream();
RandomAccessFile file = new RandomAccessFile("temp.exe","rw");
//指定从哪个位置开始写数据
file.seek(startIndex);

byte[] buffer = new byte[1024*1024];
int len = -1;
int total = 0;
while((len = is.read(buffer)) != -1){
file.write(buffer, 0, len);
total = total + len;
int currentPosition = startIndex + total;
//能够即时的把数据写到数据
RandomAccessFile f = new RandomAccessFile(threadId+".txt", "rwd");
f.write((currentPosition+"").getBytes());
f.close();

}

file.close();
System.out.println("线程"+threadId+"下载完成...............");
synchronized (ThreadDownLoader.this) {
runningThreadCount--;
if(runningThreadCount == 0){
System.out.println("文件下载完成...............");
}
}
}
} catch (Exception e) {
System.out.println("线程"+threadId+"下载失败...............");
e.printStackTrace();
}
}
}

多线程下载移植到Android项目上（重点）

1、设置布局文件：

2、修改代码：

MainActivity.java:

package com.itheima.multithreaddownload;

import java.io.RandomAccessFile;
import java.net.HttpURLConnection;
import java.net.URL;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {

private EditText et_path;
private EditText et_threadCount;

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

et_path = (EditText) findViewById(R.id.et_path);

et_threadCount = (EditText) findViewById(R.id.et_threadCount);
}

public void downLoad(View view){

final String path = et_path.getText().toString().trim();

String threadCountStr = et_threadCount.getText().toString().trim();

if(TextUtils.isEmpty(path) || TextUtils.isEmpty(threadCountStr)){

Toast.makeText(this, "下载地址或线程个数不能为空", 0).show();
return;
}else{
//
final int threadCount = Integer.valueOf(threadCountStr);

new Thread(){

public void run() {
try {
// String path = "http://192.168.22.136:8080/sogou.exe";
URL url = new URL(path);

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setRequestMethod("GET");
conn.setConnectTimeout(3000);

int code = conn.getResponseCode();
if(code == 200){
int length = conn.getContentLength();
//1、在客户端创建一个与服务端文件一样大小的文件
RandomAccessFile file = new RandomAccessFile(Environment.getExternalStorageDirectory()+"/temp.exe", "rw");
file.setLength(length);
//3、每个子线程下载数据块 ,下载的起始位置和结束位置
int blockSize = length/threadCount;

// threadId * blockSize ---- （threadId+1）* blockSize -1
for(int threadId =0; threadId < threadCount; threadId++){
//下载的起始位置和结束位置
int startIndex = threadId * blockSize;
int endIndex = 0;

if(threadId != (threadCount -1)){
endIndex = (threadId + 1) * blockSize - 1;
}else{
endIndex = length-1;
}

//开启子线程下载数据
new ThreadDownLoader(path, startIndex, endIndex, threadId, threadCount).start();

}

}else{
//抛出异常
}
} catch (Exception e) {
e.printStackTrace();
}
};
}.start();
}
}

}

使用xutils实现多线程下载（重点）

1. 导入xutils包

2. 初始化httputils对象

   HttpUtils http = new HttpUtils();
   /**
   * 2 进行下载
   * url 下载的路径
   * target 存放目标地址
   * autoResume 是否支持断点续传下载
   */
   http.download(path, "/mnt/sdcard/feiq.exe", true, new RequestCallBack() {

   //下载成功的回调
   @Override
   public void onSuccess(ResponseInfo responseInfo) {
   Toast.makeText(getApplicationContext(), "下载成功", 0).show();

   }

   //下载失败的回调
   @Override
   public void onFailure(HttpException error, String msg) {
   }
   //当前进度
   @Override
   public void onLoading(long total, long current, boolean isUploading) {

   pb.setMax((int) total); //设置进度条的最大值
   pb.setProgress((int) current);

   super.onLoading(total, current, isUploading);
   }

   });