
2015年7月9日
1.必須安裝nodejs
2.安裝cnpm用cnpm替代npm
地址:http://npm.taobao.org/
安裝cnpm:
npm install -g cnpm --registry=https://registry.npm.taobao.org
3、用yarn替代npm
yarn的安裝:
第一種方法:參考官方文檔https://yarn.bootcss.com/
第二種方法:cnpm install -g yarn 或者 npm install -g yarn
4、搭建React開發(fā)環(huán)境的第一種方法(老-現(xiàn)在推薦):
https://reactjs.org/docs/create-a-new-react-app.html
1、必須要安裝nodejs 注意:安裝nodejs穩(wěn)定版本 教程中的nodejs版本:v8.11.2 教程中的npm版本:v5.6.0
2.安裝腳手架工具 (單文件組件項(xiàng)目生成工具) 只需要安裝一次
npm install -g create-react-app / cnpm install -g create-react-app
3.創(chuàng)建項(xiàng)目 (可能創(chuàng)建多次)
找到項(xiàng)目要創(chuàng)建的目錄:
create-react-app reactdemo
4.cd 到項(xiàng)目里面
cd reactdemo
npm start yarn start運(yùn)行項(xiàng)目
npm run build yarn build 生成項(xiàng)目
5、搭建React的開發(fā)環(huán)境的第二種方法(新-未來推薦):
https://reactjs.org/docs/create-a-new-react-app.html
1、必須要安裝nodejs 注意:安裝nodejs穩(wěn)定版本 教程中的nodejs版本:v8.11.2 教程中的npm版本:v5.6.0
2.安裝腳手架工具并創(chuàng)建項(xiàng)目
找到項(xiàng)目要創(chuàng)建的目錄執(zhí)行:
npx create-react-app reactdemo
4.cd 到項(xiàng)目里面
cd reactdemo
npm start 運(yùn)行項(xiàng)目(調(diào)試)
npm run build 生成項(xiàng)目(發(fā)布)
npx介紹:
npm v5.2.0引入的一條命令(npx),引入這個命令的目的是為了提升開發(fā)者使用包內(nèi)提供的命令行工具的體驗(yàn)。
詳情:
npx create-react-app reactdemo這條命令會臨時安裝 create-react-app 包,命令完成后create-react-app 會刪掉,不會出現(xiàn)在 global 中。下次再執(zhí)行,還是會重新臨時安裝。
npx 會幫你執(zhí)行依賴包里的二進(jìn)制文件。
再比如 npx http-server 可以一句話幫你開啟一個靜態(tài)服務(wù)器
posted @
2020-04-16 15:25 Terry Zou 閱讀(307) |
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@PostConstruct
PostConstruct注釋用于在完成依賴項(xiàng)注入以執(zhí)行任何初始化之后需要執(zhí)行的方法。必須在類投入使用之前調(diào)用此方法。
所有支持依賴注入的類都必須支持此注釋。即使類沒有請求注入任何資源,也必須調(diào)用使用PostConstruct注釋的方法。
只有一個方法可以使用此批注進(jìn)行批注。
應(yīng)用PostConstruct注釋的方法必須滿足以下所有條件:除了攔截器之外,方法絕不能有任何參數(shù),在這種情況下它采用Interceptor規(guī)范定義的InvocationContext對象。
在攔截器類上定義的方法必須具有以下簽名之一:
void <METHOD>(InvocationContext)Object <METHOD>(InvocationContext)拋出異常注意:
PostConstruct攔截器方法不能拋出應(yīng)用程序異常,但可以聲明它拋出檢查異常,包括java.lang.Exception,
如果相同的攔截器方法除了生命周期事件之外插入業(yè)務(wù)或超時方法。
如果PostConstruct攔截器方法返回一個值,容器將忽略它。
在非攔截器類上定義的方法必須具有以下簽名:void <METHOD>()應(yīng)用PostConstruct的方法可以是public,protected,package private或private。
除應(yīng)用程序客戶端外,該方法絕不能是靜態(tài)的。
該方法可能是最終的。如果該方法拋出一個未經(jīng)檢查的異常,那么該類絕不能投入使用,除非EJB可以處理異常甚至從它們恢復(fù)的EJB
然后就會思考問題,這個注釋是修飾初始化之后需要執(zhí)行的方法,那么它和@Autowired、構(gòu)造函數(shù)的執(zhí)行順序是什么呢?(當(dāng)然注釋中已經(jīng)說明了PostConstruct注釋用于在完成依賴項(xiàng)注入之后)
@Service
public class BeanA {
@Autowired
private BeanB beanB;
public BeanA() {
System.out.println("這是Bean A 的構(gòu)造方法");
}
@PostConstruct
private void init() {
System.out.println("這是BeanA的 init 方法");
beanB.testB();
}
}
@Service
public class BeanB {
@PostConstruct
private void init() {
System.out.println("這是BeanB 的init 方法");
}
public BeanB() {
System.out.println("這是Bean B的 構(gòu)造方法");
}
void testB() {
System.out.println("這是Bean B 的 testB 方法");
}
}
啟動后輸出:
這是Bean A 的構(gòu)造方法
這是Bean B的 構(gòu)造方法
這是BeanB 的init 方法
這是BeanA的 init 方法
這是Bean B 的 testB 方法
所以得到結(jié)論: 構(gòu)造方法 > @Autowired > @PostConstruct
posted @
2020-04-09 15:29 Terry Zou 閱讀(308) |
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1、ApplicationContext
Spring的核心,Context我們通常解釋為上下文環(huán)境。ApplicationContext則是應(yīng)用的容器。 Spring把Bean(object)放在容器中,需要用就通過get方法取出來。在ApplicationContext接口的眾多實(shí)現(xiàn)類中,有3個是我們經(jīng)常用到的(見表1-1),并且使用這3個實(shí)現(xiàn)類也基本能滿足我們Java EE應(yīng)用開發(fā)中的絕大部分需求。
表1-1 ApplicationContext接口的常用實(shí)現(xiàn)類介紹
2、ApplicationEvent
是個抽象類,里面只有一個構(gòu)造函數(shù)和一個長整型的timestamp。其源碼如下
public abstract class ApplicationEvent extends EventObject {
/** use serialVersionUID from Spring 1.2 for interoperability */
private static final long serialVersionUID = 7099057708183571937L;
/** System time when the event happened */
private final long timestamp;
/**
* Create a new ApplicationEvent.
* @param source the object on which the event initially occurred (never {@code null})
*/
public ApplicationEvent(Object source) {
super(source);
this.timestamp = System.currentTimeMillis();
}
/**
* Return the system time in milliseconds when the event happened.
*/
public final long getTimestamp() {
return this.timestamp;
}
}
3、ApplicationListener是一個接口,里面只有一個onApplicationEvent方法。如果在上下文中部署一個實(shí)現(xiàn)了ApplicationListener接口的bean,那么每當(dāng)在一個ApplicationEvent發(fā)布到 ApplicationContext時,調(diào)用ApplicationContext.publishEvent()方法,這個bean得到通知。類似于Oberver設(shè)計(jì)模式。
其源碼如下:
public interface ApplicationListener<E extends ApplicationEvent> extends EventListener {
/**
* Handle an application event.
* @param event the event to respond to
*/
void onApplicationEvent(E event);
}
下面舉個例子
自定義事件NotifyEvent:
import org.springframework.context.ApplicationEvent;
public class NotifyEvent extends ApplicationEvent {
private String email;
private String content;
public NotifyEvent(Object source){
super(source);
}
public NotifyEvent(Object source,String email,String content){
super(source);
this.email = email;
this.content = content;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
}
定義監(jiān)聽器NotifyListener:
import org.springframework.context.ApplicationListener;
import org.springframework.context.annotation.Configuration;
@Configuration
public class NotifyListener implements ApplicationListener<NotifyEvent>{
@Override
public void onApplicationEvent(NotifyEvent event) {
System.out.println("郵件地址:" + event.getEmail());
System.out.println("郵件內(nèi)容:" + event.getContent());
}
}
單元測試類ListenerTest: import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.web.context.WebApplicationContext;
@RunWith(SpringRunner.class)
@SpringBootTest(classes = ServerLauncher.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class ListenerTest {
@Autowired
private WebApplicationContext webApplicationContext;
@Test
public void testListener(){
NotifyEvent event = new NotifyEvent("object","abc@qq.com","This is the content");
webApplicationContext.publishEvent(event);
}
}
posted @
2020-04-09 14:47 Terry Zou 閱讀(1281) |
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之前用戶使用的是3個注解注解他們的main類。分別是@Configuration,@EnableAutoConfiguration,@ComponentScan。由于這些注解一般都是一起使用,spring boot提供了一個統(tǒng)一的注解@SpringBootApplication。
@SpringBootApplication = (默認(rèn)屬性)@Configuration + @EnableAutoConfiguration + @ComponentScan。
@SpringBootApplication
public class ApplicationMain {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
分開解釋@Configuration,@EnableAutoConfiguration,@ComponentScan。
1、@Configuration:提到@Configuration就要提到他的搭檔@Bean。使用這兩個注解就可以創(chuàng)建一個簡單的spring配置類,可以用來替代相應(yīng)的xml配置文件。
<beans>
<bean id = "car" class="com.test.Car">
<property name="wheel" ref = "wheel"></property>
</bean>
<bean id = "wheel" class="com.test.Wheel"></bean>
</beans>
相當(dāng)于:
@Configuration
public class Conf {
@Bean
public Car car() {
Car car = new Car();
car.setWheel(wheel());
return car;
}
@Bean
public Wheel wheel() {
return new Wheel();
}
}
@Configuration的注解類標(biāo)識這個類可以使用Spring IoC容器作為bean定義的來源。@Bean注解告訴Spring,一個帶有@Bean的注解方法將返回一個對象,該對象應(yīng)該被注冊為在Spring應(yīng)用程序上下文中的bean。
2、@EnableAutoConfiguration:能夠自動配置spring的上下文,試圖猜測和配置你想要的bean類,通常會自動根據(jù)你的類路徑和你的bean定義自動配置。
3、@ComponentScan:會自動掃描指定包下的全部標(biāo)有@Component的類,并注冊成bean,當(dāng)然包括@Component下的子注解@Service,@Repository,@Controller。
posted @
2020-04-09 09:10 Terry Zou 閱讀(130) |
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package com.zhihe.xqsh.utils;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.Date;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.HttpVersion;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.params.ConnManagerParams;
import org.apache.http.conn.params.ConnRouteParams;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.impl.cookie.BasicClientCookie;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.util.EntityUtils;
import com.zhihe.xqsh.network.ServerErrorException;
import android.accounts.NetworkErrorException;
import android.annotation.SuppressLint;
import android.util.Log;
public class CustomerHttpClient {
private static final String TAG = CustomerHttpClient.class.getSimpleName();
private static DefaultHttpClient customerHttpClient;
private CustomerHttpClient() {
}
public static synchronized HttpClient getHttpClient() {
if (null == customerHttpClient) {
HttpParams params = new BasicHttpParams();
// 設(shè)置????基本參數(shù)
HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
HttpProtocolParams.setContentCharset(params, "UTF-8");
HttpProtocolParams.setUseExpectContinue(params, true);
HttpProtocolParams.setUserAgent(params, "Mozilla/5.0(Linux;U;Android 2.2.1;en-us;Nexus One Build.FRG83) "
+ "AppleWebKit/553.1(KHTML,like Gecko) Version/4.0 Mobile Safari/533.1");
// 超時設(shè)置
/* 從連接池中取連接的超時時??*/
ConnManagerParams.setTimeout(params, 2000);
ConnManagerParams.setMaxTotalConnections(params, 800);
/* 連接超時 */
HttpConnectionParams.setConnectionTimeout(params, 5000);
/* 請求超時 */
HttpConnectionParams.setSoTimeout(params, 10000);
// 設(shè)置我們的HttpClient支持HTTP和HTTPS兩種模式
SchemeRegistry schReg = new SchemeRegistry();
schReg.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
schReg.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), 443));
// 使用線程安全的連接管理來創(chuàng)建HttpClient
ClientConnectionManager conMgr = new ThreadSafeClientConnManager(params, schReg);
// ????連接數(shù):ConnManagerParams.setMaxTotalConnections(params, 50);
customerHttpClient = new DefaultHttpClient(conMgr, params);
}
return customerHttpClient;
}
/**
* 以get方式提交數(shù)據(jù)
*
* @param url 提交地址
* @param params 參數(shù)
* @return 響應(yīng)結(jié)果
* @throws ServerErrorException 請求失敗
* @throws NetworkErrorException 連接失敗
*/
public static String get(String url, String params) throws ServerErrorException, NetworkErrorException {
int tryTimes = 0;
NullPointerException ex;
do {
try {
return tryGet(url, params);
} catch (NullPointerException e) {
ex = e;
tryTimes++;
}
} while (tryTimes < 3);
throw ex;
}
/**
* 以get方式提交數(shù)據(jù)
*
* @param url 提交地址
* @param params 參數(shù)
* @return 響應(yīng)結(jié)果
* @throws ServerErrorException 請求失敗
* @throws NetworkErrorException 連接失敗
*/
public static String tryGet(String url, String params) throws ServerErrorException, NetworkErrorException {
try {
HttpGet request = new HttpGet(url + params);
/*if (LotteryApplication.isCmwap()) {
org.apache.http.HttpHost proxy = new org.apache.http.HttpHost("10.0.0.172", 80, "http");
HttpParams httpParams = new BasicHttpParams();
ConnRouteParams.setDefaultProxy(httpParams, proxy);
request.setParams(httpParams);
}*/
HttpClient client = getHttpClient();
HttpResponse response = client.execute(request);
if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
throw new ServerErrorException("????????æ???????????");
}
HttpEntity resEntity = response.getEntity();
String result = (resEntity == null) ? null : EntityUtils.toString(resEntity, "UTF-8");
return result;
} catch (UnsupportedEncodingException e) {
logw(e.getMessage());
return null;
} catch (ClientProtocolException e) {
logw(e.getMessage());
return null;
} catch (IOException e) {
throw new NetworkErrorException("??????????????????????", e);
}
}
private static void logw(String string) {
if (string != null) {
Log.w(TAG, string);
}
}
/**
* 以post方式提交數(shù)據(jù)
*
* @param url 提交地址
* @param params 參數(shù)
* @return 響應(yīng)結(jié)果
* @throws ServerErrorException 請求失敗
* @throws NetworkErrorException 連接失敗
*/
public static String post(String url, List<NameValuePair> params) throws ServerErrorException, NetworkErrorException {
return post(url, params, null);
}
/**
* 以post方式提交數(shù)據(jù)
*
* @param url 提交地址
* @param params 參數(shù)
* @param soTimeout 響應(yīng)超時時間,單位毫??
* @return 響應(yīng)結(jié)果
* @throws ServerErrorException 請求失敗
* @throws NetworkErrorException 連接失敗
*/
public static String post(String url, List<NameValuePair> params, int soTimeout) throws ServerErrorException,
NetworkErrorException {
HttpParams httpParams;
if (soTimeout <= 0) {
httpParams = null;
} else {
httpParams = new BasicHttpParams();
HttpConnectionParams.setSoTimeout(httpParams, soTimeout);
}
return post(url, params, httpParams);
}
/**
* 以post方式提交數(shù)據(jù)
*
* @param url 提交地址
* @param params 參數(shù)
* @param httpParams http參數(shù)
* @return 響應(yīng)結(jié)果
* @throws ServerErrorException 請求失敗
* @throws NetworkErrorException 連接失敗
*/
public static String post(String url, List<NameValuePair> params, HttpParams httpParams) throws ServerErrorException,
NetworkErrorException {
int tryTimes = 0;
NullPointerException ex;
do {
try {
return tryPost(url, params, httpParams);
} catch (NullPointerException e) {
ex = e;
tryTimes++;
}
} while (tryTimes < 3);
throw ex;
}
/**
* 以post方式提交數(shù)據(jù)
*
* @param url 提交地址
* @param params 參數(shù)
* @param httpParams http參數(shù)
* @return 響應(yīng)結(jié)果
* @throws ServerErrorException 請求失敗
* @throws NetworkErrorException 連接失敗
*/
public static String tryPost(String url, List<NameValuePair> params, HttpParams httpParams) throws ServerErrorException,
NetworkErrorException {
try {
HttpPost request = new HttpPost(url);
if (params != null && params.size() > 0) {
request.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
}
// if (LotteryApplication.isCmwap()) {
// org.apache.http.HttpHost proxy = new org.apache.http.HttpHost("10.0.0.172", 80, "http");
// if (httpParams == null)
// httpParams = new BasicHttpParams();
// ConnRouteParams.setDefaultProxy(httpParams, proxy);
// }
if (httpParams != null)
request.setParams(httpParams);
//Log.v("CS", params.toString());
HttpClient client = getHttpClient();
HttpResponse response = client.execute(request);
if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
//Log.v("CS", params.toString());
//Log.v("CS", response.getStatusLine().getStatusCode() + "");
request.abort();
throw new ServerErrorException("????????æ???????????");
}
if (response.getStatusLine ().getStatusCode () != 200) {
request.abort(); //?ж?????,?????????????????????
return null;
}
HttpEntity resEntity = response.getEntity();
String result = (resEntity == null) ? null : EntityUtils.toString(resEntity, "UTF-8");
//Log.v("CS", params.toString() + "||||" + result);
return result;
} catch (UnsupportedEncodingException e) {
logw(e.getMessage());
return null;
} catch (ClientProtocolException e) {
logw(e.getMessage());
return null;
} catch (IOException e) {
throw new NetworkErrorException(e.getMessage(), e);
//throw new NetworkErrorException("連接不成功,請檢查網(wǎng)絡(luò)設(shè)??, e);
}
}
@SuppressLint("SdCardPath")
public static String download(String url) throws ServerErrorException, NetworkErrorException {
try {
//Log.i("http-download", url);
HttpPost request = new HttpPost(url);
HttpClient client = getHttpClient();
HttpResponse response = client.execute(request);
if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
throw new ServerErrorException("????????æ???????????");
}
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
if (is == null)
throw new ServerErrorException("stream is null ");
String fileExt = url.substring(url.lastIndexOf(".") + 1, url.length()).toLowerCase();
String fileName = url.substring(url.lastIndexOf("/") + 1, url.lastIndexOf("."));
File tempFile = new File("/sdcard/" + fileName + "." + fileExt);
if (!tempFile.exists())
tempFile.createNewFile();
FileOutputStream fileOutputStream = new FileOutputStream(tempFile);
byte[] buf = new byte[1024];
int ch;
while ((ch = is.read(buf)) != -1) {
fileOutputStream.write(buf, 0, ch);
}
fileOutputStream.flush();
fileOutputStream.close();
return tempFile.getAbsolutePath();
} catch (UnsupportedEncodingException e) {
logw(e.getMessage());
return null;
} catch (ClientProtocolException e) {
logw(e.getMessage());
return null;
} catch (IOException e) {
throw new NetworkErrorException(e.getMessage(), e);
}
}
/**
* 清空cookie
*/
public static void clearCookie() {
if (customerHttpClient != null)
customerHttpClient.getCookieStore().clear();
}
/**
* 清除指定cookie
*
* @param name cookie名稱
*/
public static void clearCookie(String name) {
if (customerHttpClient == null)
return;
BasicClientCookie expiredCookie = new BasicClientCookie(name, "null");
expiredCookie.setExpiryDate(new Date(System.currentTimeMillis() - 1000));
customerHttpClient.getCookieStore().addCookie(expiredCookie);
}
}
posted @
2015-07-13 22:10 Terry Zou 閱讀(280) |
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http://yunpan.cn/ccdbTgQaYa4U7
posted @
2015-07-13 11:04 Terry Zou 閱讀(140) |
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private Drawable img_time_filter,img_time_filter_selected ;
//過濾器TextView中顯示的圖片
img_time_filter = getResources().getDrawable(R.drawable.time_filter);
//調(diào)用setCompoundDrawables時,必須調(diào)用Drawable.setBounds()方法,否則圖片不顯示
img_time_filter.setBounds(0, 0, img_time_filter.getMinimumWidth(), img_time_filter.getMinimumHeight());
img_time_filter_selected = getResources().getDrawable(R.drawable.time_filter_selected);
img_time_filter_selected.setBounds(0, 0, img_time_filter_selected.getMinimumWidth(), img_time_filter_selected.getMinimumHeight());
tv_filterTime.setCompoundDrawables(img_time_filter_selected, null, null, null);
tv_filterTime.setTextColor(getResources().getColor(R.color.white));
rl_filterTime.setBackgroundColor(getResources().getColor(R.color.red));
tv_filterTime.setCompoundDrawables(img_time_filter, null, null, null);
rl_filterTime.setBackgroundColor(getResources().getColor(R.color.white));
lv_filterTime.setVisibility(View.INVISIBLE);
posted @
2015-07-09 00:04 Terry Zou 閱讀(210) |
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