Android 自定义网络加载工具类 HttpURLConnectionUtils

代码已经上传到github，欢迎Star。

https://github.com/MZCretin/HttpUrlConnectionUtilDemo

转载请注明出处：http://blog.csdn.net/u010998327/article/details/65443615

简书地址：http://www.jianshu.com/p/3da7f0dc11a0

一个自己封装的用HttpUrlConnection请求的网络工具类，但只适合新手研究或者做些小demo用下， 毕竟现在对于Android开发的网络框架有很多，而且很好很强大。

目前支持的功能：

1、GET，POST请求

2、支持返回String，Byte[]数组，以及自定义的Model类

3、请求的回调已处理过，现在的回调在UI线程，所以可以直接更新UI

同样的，如果写demo啥的，可以按照以下方式依赖进项目：

allprojects {
repositories {
...
maven { url 'https://jitpack.io' }
}
}

dependencies {
compile 'com.github.MZCretin:HttpUrlConnectionUtilDemo:v1.0'
}

后面如果有需要，我会加上下载文件的方法。

如果有啥问题，欢迎交流：

792075058

mxnzp_life@163.com

正文

最近吃腻了外卖，想着自己做饭吃，所以就自己做了一个菜谱的小软件，从api服务上找了一个菜谱的接口就开始做了，在做的过程中，需要请求一个接口，来获取菜谱信息，于是就想到Android现在很火的各种网络框架。。。在选择的时候就犯难了，我就写个软件自己用，就简单的请求一个接口，有必要用这么重的框架么。然后就开始了主题所说的自定义一个简单的网络加载工具类。

我这边只是做了一个简单的封装。

首先：定义一个 static ExecutorService threadPool = Executors.newCachedThreadPool()，来创建一个可根据需要创建新线程的线程池，但是在以前构造的线程可用时将重用它们。因为不能在主线程请求网络，所以用这个线程池来装载我们用于进行网络请求的线程，定义一个static Gson gson = new Gson();用来将请求的json数据转换成对应的Model对象。

然后：定义第一个方法，也就是返回字符串的方法。在这个方法里，上面有关HttpURLConnection的操作都是一样的，不一样的是最后对流的处理，这个方法要求返回的是字符串，所以我们在获取到流的时候将其转化成我们需要的字符串，再通过回调给调用者，其他goGet方法也一样，如果需要byte数组，我们就返回byte数组，如果需要对象，我们就先转成String字符串，然后通过gson将json字符串转换成对应的对象返回即可。（具体请看源码，下面会贴出源码）

doGet方法

/**
* GET方法 返回数据会解析成字符串String
* @param context 上下文
* @param urlString 请求的url
* @param listener 回调监听
*/
public static void doGet(final Context context, final String urlString,
final HttpCallbackStringListener listener) {
// 因为网络请求是耗时操作，所以需要另外开启一个线程来执行该任务。
threadPool.execute(new Runnable() {
@Override
public void run() {
URL url;
HttpURLConnection httpURLConnection = null;
try {
// 根据URL地址创建URL对象
url = new URL(urlString);
// 获取HttpURLConnection对象
httpURLConnection = ( HttpURLConnection ) url.openConnection();
// 设置请求方式，默认为GET
httpURLConnection.setRequestMethod("GET");
// 设置连接超时
httpURLConnection.setConnectTimeout(5000);
// 设置读取超时
httpURLConnection.setReadTimeout(8000);
// 响应码为200表示成功，否则失败。
if ( httpURLConnection.getResponseCode() == 200 ) {
// 获取网络的输入流
InputStream is = httpURLConnection.getInputStream();
BufferedReader bf = new BufferedReader(new InputStreamReader(is, "UTF-8"));
//最好在将字节流转换为字符流的时候 进行转码
StringBuffer buffer = new StringBuffer();
String line = "";
while ( (line = bf.readLine()) != null ) {
buffer.append(line);
}
bf.close();
is.close();
new ResponseCall(context, listener).doSuccess(buffer.toString());
} else {
new ResponseCall(context, listener).doFail(
new NetworkErrorException("response err code:" +
httpURLConnection.getResponseCode()));
}
} catch ( MalformedURLException e ) {
if ( listener != null ) {
// 回调onError()方法
new ResponseCall(context, listener).doFail(e);
}
} catch ( IOException e ) {
if ( listener != null ) {
// 回调onError()方法
new ResponseCall(context, listener).doFail(e);
}
} finally {
if ( httpURLConnection != null ) {
// 释放资源
httpURLConnection.disconnect();
}
}
}
});
}

上面讲了doGet方法的实现，其实doPost方法的实现除了需要带上参数列表之外其他都是是一样的。对于参数的处理，在我的开发经历中，参数都是放在Map容器中传递的，所以在这里也就使用的这种方式，对于传进来的参数，我们需要进行处理下，其实也就是字符串的拼接，拼接成HttpURLConnection能够识别的形式。下面的代码进行了参数的组织：

final StringBuffer out = new StringBuffer();
// 组织请求参数
for (String key : params.keySet()) {
if(out.length()!=0){
out.append("&");
}
out.append(key).append("=").append(params.get(key));
}

拼接好参数列表之后，我们通过httpURLConnection.getOutputStream()获取到PrintWriter，然后写入我们的参数信息即可。其他的操作跟get请求是一样的。

PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
// 发送请求参数
printWriter.write(out.toString());
// flush输出流的缓冲
printWriter.flush();
printWriter.close();

doPost方法

/**
* POST方法 返回数据会解析成字符串 String
* @param context 上下文
* @param urlString 请求的路径
* @param listener  回调监听
* @param params 参数列表
*/
public static void doPost(final Context context,
final String urlString, final HttpCallbackStringListener listener,
final Map<String, Object> params) {
final StringBuffer out = new StringBuffer();
// 组织请求参数
for (String key : params.keySet()) {
if(out.length()!=0){
out.append("&");
}
out.append(key).append("=").append(params.get(key));
}
// 因为网络请求是耗时操作，所以需要另外开启一个线程来执行该任务。
threadPool.execute(new Runnable() {
@Override
public void run() {
URL url;
HttpURLConnection httpURLConnection = null;
try {
url = new URL(urlString);
httpURLConnection = ( HttpURLConnection ) url.openConnection();
httpURLConnection.setRequestProperty("accept", "*/*");
httpURLConnection.setRequestProperty("connection", "Keep-Alive");
httpURLConnection.setRequestProperty("Content-Length", String
.valueOf(out.length()));
httpURLConnection.setRequestMethod("POST");

httpURLConnection.setConnectTimeout(5000);
httpURLConnection.setReadTimeout(8000);

// 设置运行输入
httpURLConnection.setDoInput(true);
// 设置运行输出
httpURLConnection.setDoOutput(true);

PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
// 发送请求参数
printWriter.write(out.toString());
// flush输出流的缓冲
printWriter.flush();
printWriter.close();

if ( httpURLConnection.getResponseCode() == 200 ) {
// 获取网络的输入流
InputStream is = httpURLConnection.getInputStream();
BufferedReader bf = new BufferedReader(new InputStreamReader(is, "UTF-8"));
//最好在将字节流转换为字符流的时候 进行转码
StringBuffer buffer = new StringBuffer();
String line = "";
while ( (line = bf.readLine()) != null ) {
buffer.append(line);
}
bf.close();
is.close();
new ResponseCall(context, listener).doSuccess(buffer.toString());
} else {
new ResponseCall(context, listener).doFail(
new NetworkErrorException("response err code:" +
httpURLConnection.getResponseCode()));
}
} catch ( MalformedURLException e ) {
if ( listener != null ) {
// 回调onError()方法
new ResponseCall(context, listener).doFail(e);
}
} catch ( IOException e ) {
if ( listener != null ) {
// 回调onError()方法
new ResponseCall(context, listener).doFail(e);
}
} finally {
if ( httpURLConnection != null ) {
// 最后记得关闭连接
httpURLConnection.disconnect();
}
}
}
});
}

在上面的代码中，在请求的最后，我们会看到一个 new ResponseCall(context, listener).doSuccess(buffer.toString());这个是用来干嘛的呢？其实这个是用来进行子线程和主线程的数据交换的，定义一个Handler，不过Handler是通过looper来创建的，looper是通过传进来的上下文Context来获取主线程的looper，然后次Handler就是位于主线程的。当请求结束后，如果请求成功，则调用doSuccess(T response)方法，给Handler发送消息，消息的what值为0，消息的内容是请求的结果；请求失败或错误的时候，调用doFail(Exception e)方法，给Handler发送消息，消息的what值为1，消息的内容是请求失败的异常信息。当Handler收到消息之后，直接调用listener的回调方法，就可以一方面把数据回调回去，另一方面，回调也是处于主线程也就是UI线程了，这样调用者就可以直接在回调方法中更新UI了。

ResponseCall.java

/**
* Created by cretin on 2017/3/20.
*/

public class ResponseCall<T> {
//用于在子线程和主线程的数据交换
Handler mHandler;

public ResponseCall(Context context, final HttpCallbackModelListener listener) {
Looper looper = context.getMainLooper();
mHandler = new Handler(looper) {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if ( msg.what == 0 ) {
//成功
listener.onFinish(msg.obj);
} else if ( msg.what == 1 ) {
//失败
listener.onError(( Exception ) msg.obj);
}
}
};
}

public ResponseCall(Context context, final HttpCallbackBytesListener listener) {
Looper looper = context.getMainLooper();
mHandler = new Handler(looper) {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if ( msg.what == 0 ) {
//成功
listener.onFinish(( byte[] ) msg.obj);
} else if ( msg.what == 1 ) {
//失败
listener.onError(( Exception ) msg.obj);
}
}
};
}

public ResponseCall(Context context, final HttpCallbackStringListener listener) {
Looper looper = context.getMainLooper();
mHandler = new Handler(looper) {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if ( msg.what == 0 ) {
//成功
listener.onFinish(msg.obj.toString());
} else if ( msg.what == 1 ) {
//失败
listener.onError(( Exception ) msg.obj);
}
}
};
}

public void doSuccess(T response) {
Message message = Message.obtain();
message.obj = response;
message.what = 0;
mHandler.sendMessage(message);
}

public void doFail(Exception e) {
Message message = Message.obtain();
message.obj = e;
message.what = 1;
mHandler.sendMessage(message);
}
}

下面是实际中的调用实例：

MainActivity.java

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.TextView;

import com.cretin.www.httpurlconnectionutil.HttpUtils;
import com.cretin.www.httpurlconnectionutil.callback.HttpCallbackBytesListener;
import com.cretin.www.httpurlconnectionutil.callback.HttpCallbackModelListener;
import com.cretin.www.httpurlconnectionutil.callback.HttpCallbackStringListener;
import com.cretin.www.httpurlconnectionutildemo.model.ResponseModel;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

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

final TextView tvContent = ( TextView ) findViewById(R.id.tv_content);

//测试GET请求

//返回字符串
try {
HttpUtils.doGet(this, "http://caipu.yjghost.com/index.php/query/read?menu=" + URLEncoder.encode("土豆", "UTF-8") + "&rn=15&start=1", new HttpCallbackStringListener() {

@Override
public void onFinish(String response) {
tvContent.setText(response);
}

@Override
public void onError(Exception e) {
tvContent.setText(e.toString());
}
});
} catch ( UnsupportedEncodingException e ) {
e.printStackTrace();
}

//返回byte数组
try {
HttpUtils.doGet(this, "http://caipu.yjghost.com/index.php/query/read?menu=" + URLEncoder.encode("土豆", "UTF-8") + "&rn=15&start=1", new HttpCallbackBytesListener() {
@Override
public void onFinish(byte[] response) {
Log.e("HHHHHHH", "GET 方法：" + new String(response));
}

@Override
public void onError(Exception e) {
Log.e("HHHHHHH", "doGet onError：" + e.toString());
}
});
} catch ( UnsupportedEncodingException e ) {
e.printStackTrace();
}

//返回对象
try {
HttpUtils.doGet(this, "http://caipu.yjghost.com/index.php/query/read?menu=" +
URLEncoder.encode("土豆", "UTF-8") + "&rn=15&start=1",
new HttpCallbackModelListener<ResponseModel>() {
@Override
public void onFinish(ResponseModel response) {
Log.e("HHHHHHH", "GET 方法：" + response.getResult().getTotalNum());
}

@Override
public void onError(Exception e) {
Log.e("HHHHHHH", "doGet onError：" + e.toString());
}
}, ResponseModel.class);
} catch ( UnsupportedEncodingException e ) {
e.printStackTrace();
}

//测试POST请求

//参数列表
Map<String, Object> map = new HashMap<>();
map.put("productFirstType", "1");
map.put("loanRange", "1");
map.put("type", "hot");
map.put("page", "1");
map.put("timeRange", "1");

//返回String
HttpUtils.doPost(this, "http://101.201.31.212:8016/product/listProduct", new HttpCallbackStringListener() {
@Override
public void onFinish(String response) {
Log.e("HHHHHHH", "POST 方法：" + response);
}

@Override
public void onError(Exception e) {
Log.e("HHHHHHH", "doPost onError：" + e.toString());
}
}, map);
//返回byte数组
HttpUtils.doPost(this, "http://101.201.31.212:8016/product/listProduct", new HttpCallbackBytesListener() {
@Override
public void onFinish(byte[] response) {
Log.e("HHHHHHH", "POST 方法：" + new String(response));
}

@Override
public void onError(Exception e) {
Log.e("HHHHHHH", "doPost onError：" + e.toString());
}
}, map);
//返回对象
HttpUtils.doPost(this, "http://101.201.31.212:8016/product/listProduct", new HttpCallbackModelListener<ResponseModel>() {
@Override
public void onFinish(ResponseModel response) {
Log.e("HHHHHHH", "POST 方法：" + response.getResult().getTotalNum());
}

@Override
public void onError(Exception e) {
Log.e("HHHHHHH", "doPost onError：" + e.toString());
}
}, map, ResponseModel.class);
}
}

下面贴出整个工具类的代码：

import android.accounts.NetworkErrorException;
import android.content.Context;

import com.cretin.www.httpurlconnectionutil.callback.HttpCallbackBytesListener;
import com.cretin.www.httpurlconnectionutil.callback.HttpCallbackModelListener;
import com.cretin.www.httpurlconnectionutil.callback.HttpCallbackStringListener;
import com.cretin.www.httpurlconnectionutil.response.ResponseCall;
import com.google.gson.Gson;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Iterator;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
*  Created by cretin on 2017/3/22.
*  HttpURLConnection 网络请求工具类
*
*  数据的请求都是基于HttpURLConnection的 请求成功与失败的回调都是在主线程
*  可以直接更新UI
*/
public class HttpUtils {
static ExecutorService threadPool = Executors.newCachedThreadPool();
static Gson gson = new Gson();

/**
* GET方法 返回数据会解析成字符串String
* @param context 上下文
* @param urlString 请求的url
* @param listener 回调监听
*/
public static void doGet(final Context context, final String urlString,
final HttpCallbackStringListener listener) {
// 因为网络请求是耗时操作，所以需要另外开启一个线程来执行该任务。
threadPool.execute(new Runnable() {
@Override
public void run() {
URL url;
HttpURLConnection httpURLConnection = null;
try {
// 根据URL地址创建URL对象
url = new URL(urlString);
// 获取HttpURLConnection对象
httpURLConnection = ( HttpURLConnection ) url.openConnection();
// 设置请求方式，默认为GET
httpURLConnection.setRequestMethod("GET");
// 设置连接超时
httpURLConnection.setConnectTimeout(5000);
// 设置读取超时
httpURLConnection.setReadTimeout(8000);
// 响应码为200表示成功，否则失败。
if ( httpURLConnection.getResponseCode() == 200 ) {
// 获取网络的输入流
InputStream is = httpURLConnection.getInputStream();
BufferedReader bf = new BufferedReader(new InputStreamReader(is, "UTF-8"));
//最好在将字节流转换为字符流的时候 进行转码
StringBuffer buffer = new StringBuffer();
String line = "";
while ( (line = bf.readLine()) != null ) {
buffer.append(line);
}
bf.close();
is.close();
new ResponseCall(context, listener).doSuccess(buffer.toString());
} else {
new ResponseCall(context, listener).doFail(
new NetworkErrorException("response err code:" +
httpURLConnection.getResponseCode()));
}
} catch ( MalformedURLException e ) {
if ( listener != null ) {
// 回调onError()方法
new ResponseCall(context, listener).doFail(e);
}
} catch ( IOException e ) {
if ( listener != null ) {
// 回调onError()方法
new ResponseCall(context, listener).doFail(e);
}
} finally {
if ( httpURLConnection != null ) {
// 释放资源
httpURLConnection.disconnect();
}
}
}
});
}

/**
* GET方法 返回数据会解析成byte[]数组
* @param context 上下文
* @param urlString 请求的url
* @param listener 回调监听
*/
public static void doGet(final Context context, final String urlString,
final HttpCallbackBytesListener listener) {
// 因为网络请求是耗时操作，所以需要另外开启一个线程来执行该任务。
threadPool.execute(new Runnable() {
@Override
public void run() {
URL url = null;
HttpURLConnection httpURLConnection = null;
try {
// 根据URL地址创建URL对象
url = new URL(urlString);
// 获取HttpURLConnection对象
httpURLConnection = ( HttpURLConnection ) url.openConnection();
// 设置请求方式，默认为GET
httpURLConnection.setRequestMethod("GET");
// 设置连接超时
httpURLConnection.setConnectTimeout(5000);
// 设置读取超时
httpURLConnection.setReadTimeout(8000);
// 响应码为200表示成功，否则失败。
if ( httpURLConnection.getResponseCode() != 200 ) {
new ResponseCall(context, listener).doFail(
new NetworkErrorException("response err code:" +
httpURLConnection.getResponseCode()));
} else {
// 获取网络的输入流
InputStream is = httpURLConnection.getInputStream();
// 读取输入流中的数据
BufferedInputStream bis = new BufferedInputStream(is);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] bytes = new byte[1024];
int len = -1;
while ( (len = bis.read(bytes)) != -1 ) {
baos.write(bytes, 0, len);
}
bis.close();
is.close();
// 响应的数据
new ResponseCall(context, listener).doSuccess(baos.toByteArray());
}
} catch ( MalformedURLException e ) {
if ( listener != null ) {
// 回调onError()方法
new ResponseCall(context, listener).doFail(e);
}
} catch ( IOException e ) {
if ( listener != null ) {
// 回调onError()方法
new ResponseCall(context, listener).doFail(e);
}
} finally {
if ( httpURLConnection != null ) {
// 释放资源
httpURLConnection.disconnect();
}
}
}
});
}

/**
* GET方法 返回数据会解析成cls对象
* @param context 上下文
* @param urlString 请求路径
* @param listener 回调监听
* @param cls 返回的对象
* @param <T> 监听的泛型
*/
public static <T> void doGet(final Context context,
final String urlString,
final HttpCallbackModelListener listener, final Class<T> cls) {
// 因为网络请求是耗时操作，所以需要另外开启一个线程来执行该任务。
threadPool.execute(new Runnable() {
@Override
public void run() {
URL url;
HttpURLConnection httpURLConnection = null;
try {
// 根据URL地址创建URL对象
url = new URL(urlString);
// 获取HttpURLConnection对象
httpURLConnection = ( HttpURLConnection ) url.openConnection();
// 设置请求方式，默认为GET
httpURLConnection.setRequestMethod("GET");
// 设置连接超时
httpURLConnection.setConnectTimeout(5000);
// 设置读取超时
httpURLConnection.setReadTimeout(8000);
// 响应码为200表示成功，否则失败。
if ( httpURLConnection.getResponseCode() == 200 ) {
// 获取网络的输入流
InputStream is = httpURLConnection.getInputStream();
BufferedReader bf = new BufferedReader(new InputStreamReader(is, "UTF-8"));
//最好在将字节流转换为字符流的时候 进行转码
StringBuffer buffer = new StringBuffer();
String line = "";
while ( (line = bf.readLine()) != null ) {
buffer.append(line);
}
bf.close();
is.close();
new ResponseCall(context, listener).doSuccess(gson.fromJson(buffer.toString(), cls));
} else {
if ( listener != null ) {
// 回调onError()方法
new ResponseCall(context, listener).doFail(
new NetworkErrorException("response err code:" +
httpURLConnection.getResponseCode()));
}
}
} catch ( MalformedURLException e ) {
if ( listener != null ) {
// 回调onError()方法
new ResponseCall(context, listener).doFail(e);
}
} catch ( IOException e ) {
if ( listener != null ) {
// 回调onError()方法
new ResponseCall(context, listener).doFail(e);
}
} finally {
if ( httpURLConnection != null ) {
// 释放资源
httpURLConnection.disconnect();
}
}
}
});
}

/**
* POST方法 返回数据会解析成字符串 String
* @param context 上下文
* @param urlString 请求的路径
* @param listener  回调监听
* @param params 参数列表
*/
public static void doPost(final Context context,
final String urlString, final HttpCallbackStringListener listener,
final Map<String, Object> params) {
final StringBuffer out = new StringBuffer();
// 组织请求参数
for (String key : params.keySet()) {
if(out.length()!=0){
out.append("&");
}
out.append(key).append("=").append(params.get(key));
}
// 因为网络请求是耗时操作，所以需要另外开启一个线程来执行该任务。
threadPool.execute(new Runnable() {
@Override
public void run() {
URL url;
HttpURLConnection httpURLConnection = null;
try {
url = new URL(urlString);
httpURLConnection = ( HttpURLConnection ) url.openConnection();
httpURLConnection.setRequestProperty("accept", "*/*");
httpURLConnection.setRequestProperty("connection", "Keep-Alive");
httpURLConnection.setRequestProperty("Content-Length", String
.valueOf(out.length()));
httpURLConnection.setRequestMethod("POST");

httpURLConnection.setConnectTimeout(5000);
httpURLConnection.setReadTimeout(8000);

// 设置运行输入
httpURLConnection.setDoInput(true);
// 设置运行输出
httpURLConnection.setDoOutput(true);

PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
// 发送请求参数
printWriter.write(out.toString());
// flush输出流的缓冲
printWriter.flush();
printWriter.close();

if ( httpURLConnection.getResponseCode() == 200 ) {
// 获取网络的输入流
InputStream is = httpURLConnection.getInputStream();
BufferedReader bf = new BufferedReader(new InputStreamReader(is, "UTF-8"));
//最好在将字节流转换为字符流的时候 进行转码
StringBuffer buffer = new StringBuffer();
String line = "";
while ( (line = bf.readLine()) != null ) {
buffer.append(line);
}
bf.close();
is.close();
new ResponseCall(context, listener).doSuccess(buffer.toString());
} else {
new ResponseCall(context, listener).doFail(
new NetworkErrorException("response err code:" +
httpURLConnection.getResponseCode()));
}
} catch ( MalformedURLException e ) {
if ( listener != null ) {
// 回调onError()方法
new ResponseCall(context, listener).doFail(e);
}
} catch ( IOException e ) {
if ( listener != null ) {
// 回调onError()方法
new ResponseCall(context, listener).doFail(e);
}
} finally {
if ( httpURLConnection != null ) {
// 最后记得关闭连接
httpURLConnection.disconnect();
}
}
}
});
}

/**
* POST方法 返回数据会解析成Byte[]数组
* @param context 上下文
* @param urlString 请求的路径
* @param listener  回调监听
* @param params 参数列表
*/
public static void doPost(final Context context,
final String urlString, final HttpCallbackBytesListener listener,
final Map<String, Object> params) {
final StringBuffer out = new StringBuffer();
// 组织请求参数
for (String key : params.keySet()) {
if(out.length()!=0){
out.append("&");
}
out.append(key).append("=").append(params.get(key));
}
// 因为网络请求是耗时操作，所以需要另外开启一个线程来执行该任务。
threadPool.execute(new Runnable() {
@Override
public void run() {
URL url;
HttpURLConnection httpURLConnection = null;
try {
url = new URL(urlString);
httpURLConnection = ( HttpURLConnection ) url.openConnection();
httpURLConnection.setRequestProperty("accept", "*/*");
httpURLConnection.setRequestProperty("connection", "Keep-Alive");
httpURLConnection.setRequestProperty("Content-Length", String
.valueOf(out.length()));
httpURLConnection.setRequestMethod("POST");

httpURLConnection.setConnectTimeout(5000);
httpURLConnection.setReadTimeout(8000);

// 设置运行输入
httpURLConnection.setDoInput(true);
// 设置运行输出
httpURLConnection.setDoOutput(true);

PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
// 发送请求参数
printWriter.write(out.toString());
// flush输出流的缓冲
printWriter.flush();
printWriter.close();

if ( httpURLConnection.getResponseCode() == 200 ) {
// 获取网络的输入流
InputStream is = httpURLConnection.getInputStream();
// 读取输入流中的数据
BufferedInputStream bis = new BufferedInputStream(is);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] bytes = new byte[1024];
int len = -1;
while ( (len = bis.read(bytes)) != -1 ) {
baos.write(bytes, 0, len);
}
bis.close();
is.close();
// 响应的数据
new ResponseCall(context, listener).doSuccess(baos.toByteArray());
} else {
new ResponseCall(context, listener).doFail(
new NetworkErrorException("response err code:" +
httpURLConnection.getResponseCode()));
}
} catch ( MalformedURLException e ) {
if ( listener != null ) {
// 回调onError()方法
new ResponseCall(context, listener).doFail(e);
}
} catch ( IOException e ) {
if ( listener != null ) {
// 回调onError()方法
new ResponseCall(context, listener).doFail(e);
}
} finally {
if ( httpURLConnection != null ) {
// 最后记得关闭连接
httpURLConnection.disconnect();
}
}
}
});
}

/**
* /**
* POST方法 返回数据会解析成cls对象
* @param context 上下文
* @param urlString 请求的路径
* @param listener  回调监听
* @param params 参数列表
* @param cls 对象
* @param <T> 监听泛型
*/
public static <T> void doPost(final Context context,
final String urlString, final HttpCallbackModelListener listener,
final Map<String, Object> params, final Class<T> cls) {
final StringBuffer paramsStr = new StringBuffer();
// 组织请求参数
Iterator it = params.entrySet().iterator();
while ( it.hasNext() ) {
Map.Entry element = ( Map.Entry ) it.next();
paramsStr.append(element.getKey());
paramsStr.append("=");
paramsStr.append(element.getValue());
paramsStr.append("&");
}
if ( paramsStr.length() > 0 ) {
paramsStr.deleteCharAt(paramsStr.length() - 1);
}
// 因为网络请求是耗时操作，所以需要另外开启一个线程来执行该任务。
threadPool.execute(new Runnable() {
@Override
public void run() {
URL url;
HttpURLConnection httpURLConnection = null;
try {
url = new URL(urlString);
httpURLConnection = ( HttpURLConnection ) url.openConnection();

httpURLConnection.setRequestMethod("POST");

httpURLConnection.setConnectTimeout(5000);
httpURLConnection.setReadTimeout(8000);

// 设置运行输入
httpURLConnection.setDoInput(true);
// 设置运行输出
httpURLConnection.setDoOutput(true);

PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
// 发送请求参数
printWriter.write(paramsStr.toString());
// flush输出流的缓冲
printWriter.flush();
printWriter.close();

if ( httpURLConnection.getResponseCode() == 200 ) {
// 获取网络的输入流
InputStream is = httpURLConnection.getInputStream();
BufferedReader bf = new BufferedReader(new InputStreamReader(is, "UTF-8"));
//最好在将字节流转换为字符流的时候 进行转码
StringBuffer buffer = new StringBuffer();
String line = "";
while ( (line = bf.readLine()) != null ) {
buffer.append(line);
}
bf.close();
is.close();
new ResponseCall(context, listener).doSuccess(gson.fromJson(buffer.toString(), cls));
} else {
new ResponseCall(context, listener).doFail(
new NetworkErrorException("response err code:" +
httpURLConnection.getResponseCode()));
}
} catch ( MalformedURLException e ) {
if ( listener != null ) {
// 回调onError()方法
new ResponseCall(context, listener).doFail(e);
}
} catch ( IOException e ) {
if ( listener != null ) {
// 回调onError()方法
new ResponseCall(context, listener).doFail(e);
}
} finally {
if ( httpURLConnection != null ) {
// 最后记得关闭连接
httpURLConnection.disconnect();
}
}
}
});
}
}

HttpCallbackBytesListener.java

/**
* HttpURLConnection网络请求返回监听器
*/
public interface HttpCallbackBytesListener {
// 网络请求成功
void onFinish(byte[] response);

// 网络请求失败
void onError(Exception e);
}

HttpCallbackModelListener.java

/**
* HttpURLConnection网络请求返回监听器
*/
public interface  HttpCallbackModelListener<T> {
// 网络请求成功
void onFinish(T response);

// 网络请求失败
void onError(Exception e);
}

HttpCallbackStringListener.java

/**
* HttpURLConnection网络请求返回监听器
*/
public interface HttpCallbackStringListener {
// 网络请求成功
void onFinish(String response);

// 网络请求失败
void onError(Exception e);
}

代码已经上传到github，欢迎Star。

我叫Cretin，一个可爱的小男孩。

https://github.com/MZCretin/HttpUrlConnectionUtilDemo