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Java OkHttp使用
本文使用eclipse编辑器，gradle依赖jar，如若未配置此环境，请转Java Eclipse配置gradle编译项目配置好环境后再查看此文
- 在build.gradle中添加依赖
compile 'com.squareup.okhttp3:okhttp:3.8.1' - 同步Get请求
-
/**
-
* 同步get请求
-
*/
-
public static void syncGet() throws Exception{
-
String urlBaidu =
"http://www.baidu.com/";
-
OkHttpClient okHttpClient =
new OkHttpClient();
// 创建OkHttpClient对象
-
Request request =
new Request.Builder().url(urlBaidu).build();
// 创建一个请求
-
Response response = okHttpClient.newCall(request).execute();
// 返回实体
-
if (response.isSuccessful()) {
// 判断是否成功
-
/**获取返回的数据，可通过response.body().string()获取，默认返回的是utf-8格式；
-
* string()适用于获取小数据信息，如果返回的数据超过1M，建议使用stream()获取返回的数据，
-
* 因为string() 方法会将整个文档加载到内存中。*/
-
System.
out.println(response.body().
string());
// 打印数据
-
}
else {
-
System.
out.println(
"失败");
// 链接失败
-
}
-
}
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- 异步Get请求
-
/**
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* 异步Get请求
-
*/
-
public static void asyncGet() {
-
String urlBaidu =
"http://www.baidu.com/";
-
OkHttpClient okHttpClient =
new OkHttpClient();
// 创建OkHttpClient对象
-
Request request =
new Request.Builder().url(urlBaidu).build();
// 创建一个请求
-
okHttpClient.newCall(request).enqueue(
new Callback() {
// 回调
-
-
public void onResponse(Call call, Response response) throws IOException {
-
// 请求成功调用，该回调在子线程
-
System.
out.println(response.body().
string());
-
}
-
-
public void onFailure(Call call, IOException e) {
-
// 请求失败调用
-
System.
out.println(e.getMessage());
-
}
-
});
-
}
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4.Post提交表单
-
/**
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* Post提交表单
-
*/
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public static void postFromParameters() {
-
String url =
"http://v.juhe.cn/wepiao/query";
// 请求链接
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String KEY =
"9488373060c8483a3ef6333353fdc7fe";
// 请求参数
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OkHttpClient okHttpClient =
new OkHttpClient();
// OkHttpClient对象
-
RequestBody formBody =
new FormBody.Builder().
add(
"key", KEY).build();
// 表单键值对
-
Request request =
new Request.Builder().url(url).post(formBody).build();
// 请求
-
okHttpClient.newCall(request).enqueue(
new Callback() {
// 回调
-
-
public void onResponse(Call call, Response response) throws IOException {
-
System.
out.println(response.body().
string());
//成功后的回调
-
}
-
-
public void onFailure(Call call, IOException e) {
-
System.
out.println(e.getMessage());
//失败后的回调
-
}
-
});
-
}
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- Post提交字符串
-
/**
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* Post提交字符串
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* 使用Post方法发送一串字符串，但不建议发送超过1M的文本信息
-
*/
-
public static void postStringParameters(){
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MediaType MEDIA_TYPE = MediaType.parse(
"text/text; charset=utf-8");
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String url =
"http://v.juhe.cn/wepiao/query";
// 请求链接
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OkHttpClient okHttpClient =
new OkHttpClient();
// OkHttpClient对象
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String
string =
"key=9488373060c8483a3ef6333353fdc7fe";
// 要发送的字符串
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/**
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* RequestBody.create(MEDIA_TYPE, string)
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* 第二个参数可以分别为：byte[]，byteString,File,String。
-
*/
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Request request =
new Request.Builder().url(url)
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.post(RequestBody.create(MEDIA_TYPE,
string)).build();
-
okHttpClient.newCall(request).enqueue(
new Callback() {
-
public void onResponse(Call call, Response response) throws IOException {
-
System.
out.println(response.body().
string());
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}
-
-
public void onFailure(Call call, IOException e) {
-
System.
out.println(e.getMessage());
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}
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});
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}
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- Gson解析Response的Gson对象
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/**
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* Gson解析Response的Gson对象
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*/
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public static void gsonResponsePost() {
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String url =
"http://v.juhe.cn/wepiao/query";
// 请求链接
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String KEY =
"9488373060c8483a3ef6333353fdc7fe";
// 请求参数
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OkHttpClient okHttpClient =
new OkHttpClient();
// OkHttpClient对象
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RequestBody formBody =
new FormBody.Builder().
add(
"key", KEY).build();
// 表单键值对
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Request request =
new Request.Builder().url(url).post(formBody).build();
// 请求
-
okHttpClient.newCall(request).enqueue(
new Callback() {
// 回调
-
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public void onResponse(Call call, Response response) throws IOException {
-
//成功后的回调
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Gson gson =
new Gson();
-
Info info = gson.fromJson(response.body().
string(), Info.class);
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System.
out.println(info.toString());
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}
-
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public void onFailure(Call call, IOException e) {
-
System.
out.println(e.getMessage());
//失败后的回调
-
}
-
});
-
}
-
/**
-
* Java Bean
-
*/
-
public
class
Info{
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int error_code;
//状态码
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String reason;
// 返回状态文字
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Result result;
// 页面URL
-
@
Override
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public String
toString(
) {
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return
"Info [error_code=" + error_code +
", reason=" + reason +
", result=" + result.toString() +
"]";
-
}
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}
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/**
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* Java Bean
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*/
-
public
class
Result{
-
String h5url;
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String h5weixin;
-
@
Override
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public String
toString(
) {
-
return
"Result [h5url=" + h5url +
", h5weixin=" + h5weixin +
"]";
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}
-
}
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- okhttp3 设置超时时间
-
/**
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* 设置超时
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* @throws IOException
-
*/
-
public static void timeOutPost() throws IOException {
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OkHttpClient client =
new OkHttpClient.Builder()
-
.connectTimeout(
10, TimeUnit.SECONDS)
//设置链接超时
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.writeTimeout(
10, TimeUnit.SECONDS)
// 设置写数据超时
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.readTimeout(
30, TimeUnit.SECONDS)
// 设置读数据超时
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.build();
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Request request =
new Request.Builder().url(
"http://www.baidu.com/").build();
-
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Response response = client.newCall(request).execute();
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System.out.println(
"Response completed: " + response);
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}
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- 缓存设置
-
/**
-
* 缓存设置
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* @throws Exception
-
*/
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public static void cachePost() throws Exception {
-
File sdcache =
new File(
"D:/file");
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int cacheSize =
10 *
1024 *
1024;
// 10 MiB
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OkHttpClient client =
new OkHttpClient()
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.Builder()
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.cache(
new Cache(sdcache.getAbsoluteFile(), cacheSize))
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.build();
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Request request =
new Request.Builder()
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.url(
"http://publicobject.com/helloworld.txt")
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.build();
-
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Response response1 = client.newCall(request).execute();
-
if (!response1.isSuccessful())
throw
new IOException(
"Unexpected code " + response1);
-
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String response1Body = response1.body().
string();
-
System.
out.println(
"Response 1 response: " + response1);
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System.
out.println(
"Response 1 cache response: " + response1.cacheResponse());
-
System.
out.println(
"Response 1 network response: " + response1.networkResponse());
-
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request = request.newBuilder().cacheControl(CacheControl.FORCE_NETWORK).build();
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Response response2 = client.newCall(request).execute();
-
if (!response2.isSuccessful())
throw
new IOException(
"Unexpected code " + response2);
-
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String response2Body = response2.body().
string();
-
System.
out.println(
"Response 2 response: " + response2);
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System.
out.println(
"Response 2 cache response: " + response2.cacheResponse());
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System.
out.println(
"Response 2 network response: " + response2.networkResponse());
-
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System.
out.println(
"Response 2 equals Response 1? " + response1Body.
equals(response2Body));
-
}
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打印结果:
-
Response
1 response: Response{protocol=http/
1.1, code=
200, message=OK, url=https:
//publicobject.com/helloworld.txt}
-
Response
1 cache response: Response{protocol=http/
1.1, code=
200, message=OK, url=https:
//publicobject.com/helloworld.txt}
-
Response
1 network response:
null
-
Response
2 response: Response{protocol=http/
1.1, code=
200, message=OK, url=https:
//publicobject.com/helloworld.txt}
-
Response
2 cache response:
null
-
Response
2 network response: Response{protocol=http/
1.1, code=
200, message=OK, url=https:
//publicobject.com/helloworld.txt}
-
Response
2
equals Response
1?
true
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- 复用OkHttpClient
-
/**
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* 所有HTTP请求的代理设置，超时，缓存设置等都需要在OkHttpClient中设置。 如果需要更改一个请求的配置，可以使用
-
* OkHttpClient.newBuilder()获取一个builder对象，
-
* 该builder对象与原来OkHttpClient共享相同的连接池，配置等。
-
*/
-
public static void shareClient() {
-
OkHttpClient client =
new OkHttpClient();
-
Request request =
new Request.Builder().url(
"http://www.baidu.com/").build();
-
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try {
-
// Copy to customize OkHttp for this request.
-
OkHttpClient copy = client.newBuilder().readTimeout(
500, TimeUnit.MILLISECONDS).build();
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Response response = copy.newCall(request).execute();
-
System.
out.println(
"Response 1 succeeded: " + response);
-
}
catch (IOException e) {
-
System.
out.println(
"Response 1 failed: " + e);
-
}
-
-
try {
-
// Copy to customize OkHttp for this request.
-
OkHttpClient copy = client.newBuilder().readTimeout(
3000, TimeUnit.MILLISECONDS).build();
-
Response response = copy.newCall(request).execute();
-
System.
out.println(
"Response 2 succeeded: " + response);
-
}
catch (IOException e) {
-
System.
out.println(
"Response 2 failed: " + e);
-
}
-
}
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- OkHttp3处理验证
-
/**
-
* 登录验证
-
* @throws IOException
-
*/
-
public static void authenticatorPost() throws IOException {
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OkHttpClient okHttpClient =
-
new OkHttpClient
-
.Builder()
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.authenticator(
new Authenticator() {
-
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public
Request authenticate(Route route,
Response
response) throws IOException {
-
System.out.println(
response.challenges().toString());
-
String credential = Credentials.basic(
"jesse",
"password1");
-
return
response
-
.
request()
-
.newBuilder()
-
.addHeader(
"Authorization", credential)
-
.build();
-
}
-
})
-
.build();
-
Request
request =
new
Request.Builder().url(
"http://publicobject.com/secrets/hellosecret.txt").build();
-
Response
response = okHttpClient.newCall(
request).
execute();
-
if (!
response.isSuccessful()) throw
new IOException(
"Unexpected code " +
response);
-
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System.out.println(
response.body().
string());
-
}
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</div>
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