okHttp的一个工具类

public class OkHttp3Util {
/**
* 懒汉 安全 加同步
* 私有的静态成员变量 只声明不创建
* 私有的构造方法
* 提供返回实例的静态方法
*/
private static OkHttpClient okHttpClient = null;

private OkHttp3Util() {
}

public static OkHttpClient getInstance() {
if (okHttpClient == null) {
//加同步安全
synchronized (OkHttp3Util.class) {
if (okHttpClient == null) {
//okhttp可以缓存数据....指定缓存路径
File sdcache = new File(Environment.getExternalStorageDirectory(), "cache");
//指定缓存大小
int cacheSize = 10 * 1024 * 1024;

okHttpClient = new OkHttpClient.Builder()//构建器
.connectTimeout(15, TimeUnit.SECONDS)//连接超时
.writeTimeout(20, TimeUnit.SECONDS)//写入超时
.readTimeout(20, TimeUnit.SECONDS)//读取超时
.cache(new Cache(sdcache.getAbsoluteFile(), cacheSize))//设置缓存
.build();
}
}

}

return okHttpClient;
}

/**
* get请求
* 参数1 url
* 参数2 回调Callback
*/

public static void doGet(String url, Callback callback) {

//创建OkHttpClient请求对象
OkHttpClient okHttpClient = getInstance();
//创建Request
Request request = new Request.Builder().url(url).build();
//得到Call对象
Call call = okHttpClient.newCall(request);
//执行异步请求
call.enqueue(callback);

}

/**
* post请求
* 参数1 url
* 参数2 Map<String, String> params post请求的时候给服务器传的数据
*      add..("","")
*      add()
*/

public static void doPost(String url, Map<String, String> params, Callback callback) {

//创建OkHttpClient请求对象
OkHttpClient okHttpClient = getInstance();
//3.x版本post请求换成FormBody 封装键值对参数

FormBody.Builder builder = new FormBody.Builder();
//遍历集合
for (String key : params.keySet()) {
builder.add(key, params.get(key));
Log.d("++++++++++++++",params.get(key));

}
//创建Request

Request request = new Request.Builder().url(url).post(builder.build()).build();

Call call = okHttpClient.newCall(request);
call.enqueue(callback);

}

/**
* post请求上传文件....包括图片....流的形式传任意文件...
* 参数1 url
* file表示上传的文件
* fileName....文件的名字,,例如aaa.jpg
* params ....传递除了file文件 其他的参数放到map集合
*
*/
public static void uploadFile(String url, File file, String fileName,Map<String,String> params) {
//创建OkHttpClient请求对象
OkHttpClient okHttpClient = getInstance();

MultipartBody.Builder builder = new MultipartBody.Builder();
builder.setType(MultipartBody.FORM);

//参数
if (params != null){
for (String key : params.keySet()){
builder.addFormDataPart(key,params.get(key));
}
}
//文件...参数name指的是请求路径中所接受的参数...如果路径接收参数键值是fileeeee,此处应该改变
builder.addFormDataPart("file",fileName,RequestBody.create(MediaType.parse("application/octet-stream"),file));

//构建
MultipartBody multipartBody = builder.build();

//创建Request
Request request = new Request.Builder().url(url).post(multipartBody).build();

//得到Call
aa70
Call call = okHttpClient.newCall(request);
//执行请求
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {

}

@Override
public void onResponse(Call call, Response response) throws IOException {
//上传成功回调 目前不需要处理
if (response.isSuccessful()){
String s = response.body().string();
com.orhanobut.logger.Logger.e("上传--"+s);
}
}
});

}

/**
* Post请求发送JSON数据....{"name":"zhangsan","pwd":"123456"}
* 参数一：请求Url
* 参数二：请求的JSON
* 参数三：请求回调
*/
public static void doPostJson(String url, String jsonParams, Callback callback) {
RequestBody requestBody = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), jsonParams);
Request request = new Request.Builder().url(url).post(requestBody).build();
Call call = getInstance().newCall(request);
call.enqueue(callback);

}

/**
* 下载文件 以流的形式把apk写入的指定文件 得到file后进行安装
* 参数er：请求Url
* 参数san：保存文件的文件夹....download
*/
public static void download(final Activity context, final String url, final String saveDir) {
Request request = new Request.Builder().url(url).build();
Call call = getInstance().newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
com.orhanobut.logger.Logger.e(e.getLocalizedMessage());
}

@Override
public void onResponse(Call call, final Response response) throws IOException {

InputStream is = null;
byte[] buf = new byte[2048];
int len = 0;
FileOutputStream fos = null;
try {
is = response.body().byteStream();//以字节流的形式拿回响应实体内容
//apk保存路径
final String fileDir = isExistDir(saveDir);
//文件
File file = new File(fileDir, getNameFromUrl(url));

fos = new FileOutputStream(file);
while ((len = is.read(buf)) != -1) {
fos.write(buf, 0, len);
}

fos.flush();

context.runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(context, "下载成功:" + fileDir + "," + getNameFromUrl(url), Toast.LENGTH_SHORT).show();
}
});

//apk下载完成后 调用系统的安装方法
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
context.startActivity(intent);

} catch (IOException e) {
e.printStackTrace();
} finally {
if (is != null) is.close();
if (fos != null) fos.close();

}
}
});

}

/**
* 判断下载目录是否存在......并返回绝对路径
*
* @param saveDir
* @return
* @throws IOException
*/
public static String isExistDir(String saveDir) throws IOException {
// 下载位置
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {

File downloadFile = new File(Environment.getExternalStorageDirectory(), saveDir);
if (!downloadFile.mkdirs()) {
downloadFile.createNewFile();
}
String savePath = downloadFile.getAbsolutePath();
Log.e("savePath", savePath);
return savePath;
}
return null;
}

/**
* @param url
* @return 从下载连接中解析出文件名
*/
private static String getNameFromUrl(String url) {
return url.substring(url.lastIndexOf("/") + 1);
}
}