Spring中構造器、init-method、@PostConstruct、afterPropertiesSet孰先孰后，自動注入發生時間以及單例多例的區別、SSH線程安全問題
引用： http://www.rzrgm.cn/qlqwjy/p/9417034.html
首先明白，spring的IOC功能需要是利用反射原理，反射獲取類的無參構造方法創建對象，如果一個類沒有無參的構造方法spring是不會創建對象的。在這里需要提醒一下，如果我們在class中沒有顯示的聲明構造方法，默認會生成一個無參構造方法，但是當我們顯示的聲明一個有參構造方法的時候，JVM不會幫我們生成無參構造方法,所以我們聲明一個帶參數的構造方法也需要聲明一個無參構造方法。(題外話:如果父類聲明一個有參構造方法，子類需要在構造方法第一行顯示的調用父類構造方法，因為子類的對象也是父類的對象，所以在創建子類對象的同時也會創建父類的對象，如果父類有默認的無參構造函數，JVM會調用無參構造函數，但是有了有參的就需要我們在子類的構造函數中調用父類的有參構造函數)
1.Person類只有一個有參構造方法，報錯如下:
No default constructor found; nested exception is java.lang.NoSuchMethodException: zd.dms.job.ebuy.Person.<init>()
2.大體知道有三種生命周期回調方法去參與到spring的生命周期，查閱了一下如下：(創建和銷毀的執行順序也是下面順序)
- 在指定方法上加上@PostConstruct 或@PreDestroy注解來制定該方法是在初始化之后還是銷毀之前調用。
- 通過實現 InitializingBean/DisposableBean 接口來定制初始化之后/銷毀之前的操作方法；
- 通過 <bean> 元素的 init-method/destroy-method屬性指定初始化之后 /銷毀之前調用的操作方法；
3.測試spring的順序與注入的順序與單例多例的問題
1.Person.java
package zd.dms.job.ebuy;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import zd.dms.dao.ebuy.GroupDao;
public class Person implements InitializingBean,DisposableBean{
private String name;
@Autowired
private GroupDao groupDao;
public Person() {
System.out.println("---------------實例化一個Person對象----------");
System.out.println("---------------groupDao is -----------"+groupDao);
}
public void init() {
System.out.println("------------這是xml的init方法----------....");
System.out.println("---------------groupDao is -----------"+groupDao);
}
public void destory() {
System.out.println("---------------這是xml的destroy方法....");
System.out.println("---------------groupDao is -----------"+groupDao);
}
@PostConstruct
public void init2() {
System.out.println("------------這是@PostConstruct的init方法----------....");
System.out.println("---------------groupDao is -----------"+groupDao);
}
@PreDestroy
public void destory2() {
System.out.println("---------------這是@PreDestroy的destroy方法....");
System.out.println("---------------groupDao is -----------"+groupDao);
}
@Override
public void destroy() throws Exception {
System.out.println("-----------這是DisposableBean的destroy方法....");
System.out.println("---------------groupDao is -----------"+groupDao);
}
@Override
public void afterPropertiesSet() throws Exception {
System.out.println("-------這是InitializingBean的afterPropertiesSet方法....");
System.out.println("---------------groupDao is -----------"+groupDao);
}
}
-----------------------單例模式的xml配置以及結果---------------------------------------:
配置:
<bean id="person" class="zd.dms.job.ebuy.Person" autowire="byType" destroy-method="destory" init-method="init"></bean>
測試:將Person類注入到Action我們訪問Action
@Namespace("/qlqTest")
@SuppressWarnings("all")
public class TestAction extends DMSActionSupport {
@Autowired
private Person person;
/**
*
*/
private static final long serialVersionUID = -8934360924125349297L;
@Autowired
private GroupAndUserService groupAndUserService;
private Map resultMap;
@Action("test")
public String testAction() {
person.getClass();
return "js";
}
}
當我們第一次訪問該Action會創建Person對象，打印結果如下:
- ---------------實例化一個Person對象---------- ---------------groupDao is -----------null ------------這是@PostConstruct的init方法----------.... ---------------groupDao is -----------zd.dms.dao.ebuy.GroupDaoImpl@435598e3 -------這是InitializingBean的afterPropertiesSet方法.... ---------------groupDao is -----------zd.dms.dao.ebuy.GroupDaoImpl@435598e3 ------------這是xml的init方法----------.... ---------------groupDao is -----------zd.dms.dao.ebuy.GroupDaoImpl@435598e3
證明對象創建的順序:
構造器-->自動注入-->@PostConstrut-->InitializingBean-->xml中配置init方法
再次調用不會打印，證明默認是單例的 singleton，也就是無論我們訪問多少次Action，Spring容器中只有一個這個Person實例對象。
銷毀的時候的結果:
---------------這是@PreDestroy的destroy方法.... ---------------groupDao is -----------zd.dms.dao.ebuy.GroupDaoImpl@435598e3 -----------這是DisposableBean的destroy方法.... ---------------groupDao is -----------zd.dms.dao.ebuy.GroupDaoImpl@435598e3 ---------------這是xml的destroy方法.... ---------------groupDao is -----------zd.dms.dao.ebuy.GroupDaoImpl@435598e3
所以銷毀順序為:
@PreDestroy--DisposableBean-->xml中destroy-method方法
-----------------------多例模式的xml配置以及結果---------------------------------------:
配置:
<bean id="person" class="zd.dms.job.ebuy.Person" autowire="byType" destroy-method="destory" init-method="init" scope="prototype"></bean>
我們多次訪問Action，所以Action會多次調用Person對象，發現會多次創建Person對象，也就是請求一次會創建一個對象，也就是多例:
至于到底是該使用單例還是多例，這就需要我們平時的業務需求了，springMvc就是單例的，struts2默認就是多例的。我們也可以使用注解配置單例和多例,如下:
---------------------為了理解上面的單例多例的例子，繼續測試---------------------
1.單例多例的對象創建問題
1.測試 action-service-dao是多-單-單 模式
Action:
package cn.qlq.action;
import java.util.HashMap;
import java.util.Map;
import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Namespace;
import org.apache.struts2.convention.annotation.ParentPackage;
import org.apache.struts2.convention.annotation.Result;
import org.apache.struts2.convention.annotation.Results;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import com.opensymphony.xwork2.ActionSupport;
import cn.qlq.service.UserService;
@Namespace("/")
@ParentPackage("default")
@Controller("firstAction")
@Results({ @Result(name = "redirect", location = "/index2.jsp", type = "redirect"),
@Result(name = "forward", location = "/index.jsp"),
@Result(name = "json", type = "json", params = { "root", "responseMap" }) })
public class UserAction extends ActionSupport {
private Map<String, Object> responseMap = new HashMap<String, Object>();
@Autowired
private UserService userService;
public UserAction() {
System.out.println("-----call UserAction 無參構造方法");
}
@Action("saveUser")
public String saveUser() {
userService.saveUser();
return "json";
}
public Map<String, Object> getResponseMap() {
return responseMap;
}
public void setResponseMap(Map<String, Object> responseMap) {
this.responseMap = responseMap;
}
}
Service：
package cn.qlq.service;
public interface UserService {
public void saveUser();
}
package cn.qlq.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import cn.qlq.dao.UserDao;
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserDao userDao;
public UserServiceImpl() {
System.out.println("----- call UserServiceImpl 無參構造方法");
}
@Override
public void saveUser() {
userDao.saveUser();
}
}
Dao:
package cn.qlq.dao;
public interface UserDao {
public void saveUser();
}
package cn.qlq.dao;
import org.springframework.stereotype.Repository;
@Repository
public class UserDaoImpl implements UserDao {
public UserDaoImpl() {
System.out.println("-----call UserDaoImpl 無參構造");
}
@Override
public void saveUser() {
try {
Thread.sleep(4 * 1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("----user dao (save user)---");
}
}
啟動服務，查看控制臺:（證明容器啟動創建對象）
多次訪問Action查看控制臺:
總結:
Action是struts默認多例:(注入Person類對象)
service層，默認是單例(注入GroupDaoImpl對象)
dao層默認也是單例，所以我們在多次訪問的時候容器只創建Action層對象，并將Service與dao存在的對象注入進去。也就是容器有多個Action對象，但是只有一個Service、一個Dao對象。
也就是我們上面的配置從Action到service到dao的作用域是多-單-單，:
2.測試 action-service-dao是多-單-多 模式
修改DaoImpl配置:
多次訪問Action查看控制臺:
總結:對于多-單-多的模式依舊是容器有多個Acction，一個service，一個dao對象。因為容器在創建action的時候在容器中可以找到service對象、且service是單例對象，所以不會創建service對象，也就不會創建dao對象。
3.測試 action-service-dao是多-多-多 模式
將service也修改為多例:
多次訪問Action查看控制臺:
總結:對于多-多-多 模式，每次創建Action之后由于要注入service對象，service也是多例，所以會創建service對象，創建service注入dao對象，dao對象也是多例，所以會創建dao對象。也就是每個請求action到dao都會創建新對象。
4.測試 action-service-dao是多-多-單 模式
重新將dao設為單例:
多次訪問Action:
總結:
對于多-多-單 模式，每次創建Action之后由于要注入service對象，service也是多例，所以會創建service對象，創建service注入dao對象，dao對象是單例，所以不會創建dao對象。也就是每個請求action予service都會創建新對象，dao不會創建新對象。
2.測試單例多例的線程安全問題(dao與service層單例存在線程安全問題)
1.測試多-單-單模式
Struts默認是多例，所以我們測試普通開發情況下的多-單-單的問題，假設dao有一成員變量，我們多個訪問同時修改成員變量的值，查看結果:
dao的代碼:
package cn.qlq.dao;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Repository;
@Repository
public class UserDaoImpl implements UserDao {
private static Logger log = LoggerFactory.getLogger(UserDaoImpl.class);
private int i = 1;
public UserDaoImpl() {
System.out.println("-----call UserDaoImpl 無參構造");
}
@Override
public void saveUser() {
log.info("------threamName:{},value:{}", Thread.currentThread().getName(), String.valueOf(i++));
}
}
service是單例:
package cn.qlq.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import cn.qlq.dao.UserDao;
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserDao userDao;
public UserServiceImpl() {
System.out.println("----- call UserServiceImpl 無參構造方法");
}
@Override
public void saveUser() {
userDao.saveUser();
}
}
Action還是上面代碼。
測試代碼:(模擬開啟300個線程去訪問Action)
public class MyThread implements Runnable {
@Override
public void run() {
HttpUtils.doGet("http://localhost/struts/saveUser.do");
}
public static void main(String[] args) {
MyThread mt = new MyThread();
for (int i = 0; i < 300; i++) {
new Thread(mt).start();
}
}
}
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class HttpUtils {
private static Logger logger = LoggerFactory.getLogger(HttpUtils.class);
/**
* get請求
*
* @return
*/
public static String doGet(String url) {
try {
HttpClient client = new DefaultHttpClient();
// 發送get請求
HttpGet request = new HttpGet(url);
HttpResponse response = client.execute(request);
/** 請求發送成功，并得到響應 **/
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
/** 讀取服務器返回過來的json字符串數據 **/
String strResult = EntityUtils.toString(response.getEntity(), "utf-8");
return strResult;
}
} catch (IOException e) {
logger.debug("get data error");
}
return null;
}
}
日志采用slf4j配置:
log4j.rootLogger=info,B
log4j.appender.A=org.apache.log4j.ConsoleAppender
log4j.appender.A.layout=org.apache.log4j.PatternLayout
log4j.appender.A.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%c]-[%p] %m%n
log4j.appender.B=org.apache.log4j.RollingFileAppender
log4j.appender.B.File=E:\\test.log
log4j.appender.B.MaxFileSize=10MB
log4j.appender.B.MaxBackupIndex=5
log4j.appender.B.layout=org.apache.log4j.PatternLayout
log4j.appender.B.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%c]-[%p] %m%n
查看訪問之后的日志:
2018-08-30 22:12:19 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-90,value:1 2018-08-30 22:12:19 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-275,value:2 2018-08-30 22:12:19 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-94,value:3 2018-08-30 22:12:19 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-174,value:4 2018-08-30 22:12:19 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-221,value:5 2018-08-30 22:12:19 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-294,value:6 2018-08-30 22:12:19 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-123,value:7 2018-08-30 22:12:19 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-93,value:8 2018-08-30 22:12:20 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-103,value:9 2018-08-30 22:12:20 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-80,value:10 2018-08-30 22:12:20 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-15,value:11 2018-08-30 22:12:20 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-133,value:12 2018-08-30 22:12:20 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-120,value:13 2018-08-30 22:12:20 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-239,value:14 2018-08-30 22:12:20 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-54,value:15 2018-08-30 22:12:20 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-44,value:16 2018-08-30 22:12:20 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-264,value:17 2018-08-30 22:12:21 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-51,value:18 2018-08-30 22:12:21 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-272,value:19 2018-08-30 22:12:21 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-139,value:20 2018-08-30 22:12:21 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-143,value:21 2018-08-30 22:12:21 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-69,value:22 2018-08-30 22:12:21 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-26,value:23 2018-08-30 22:12:21 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-178,value:24 2018-08-30 22:12:21 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-171,value:25 2018-08-30 22:12:21 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-203,value:26 2018-08-30 22:12:21 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-118,value:27 2018-08-30 22:12:21 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-238,value:28 2018-08-30 22:12:21 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-24,value:29 2018-08-30 22:12:21 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-163,value:30 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-3,value:31 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-135,value:32 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-297,value:33 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-234,value:34 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-169,value:35 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-70,value:36 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-76,value:37 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-288,value:38 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-95,value:39 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-47,value:40 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-98,value:41 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-60,value:42 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-79,value:43 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-67,value:44 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-102,value:45 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-292,value:46 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-145,value:47 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-20,value:48 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-236,value:49 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-246,value:50 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-115,value:51 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-162,value:52 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-148,value:53 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-228,value:54 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-78,value:55 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-42,value:56 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-189,value:57 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-37,value:58 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-167,value:59 2018-08-30 22:12:22 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-63,value:60 2018-08-30 22:12:22 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[cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-97,value:201 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-257,value:202 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-196,value:203 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-177,value:204 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-168,value:205 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-36,value:206 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-4,value:207 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-161,value:208 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-291,value:210 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-267,value:209 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-101,value:211 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-86,value:212 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-273,value:213 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-253,value:214 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-216,value:215 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-218,value:216 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-13,value:217 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-231,value:218 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-87,value:219 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-249,value:220 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-165,value:221 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-172,value:222 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-227,value:223 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-190,value:224 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-160,value:225 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-219,value:226 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-237,value:227 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-204,value:228 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-144,value:229 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-59,value:230 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-295,value:231 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-38,value:232 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-281,value:233 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-262,value:234 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-268,value:235 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-244,value:236 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-74,value:237 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-265,value:238 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-158,value:239 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-58,value:241 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-125,value:240 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-147,value:242 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-21,value:243 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-72,value:244 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-10,value:245 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-57,value:246 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-207,value:247 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-280,value:248 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-179,value:249 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-247,value:250 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-130,value:251 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-259,value:252 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-251,value:253 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-261,value:254 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-75,value:255 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-107,value:255 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-220,value:256 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-128,value:257 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-300,value:258 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-248,value:259 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-285,value:260 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-114,value:261 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-89,value:262 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-289,value:263 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-230,value:264 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-23,value:265 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-66,value:267 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-222,value:268 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-184,value:266 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-6,value:269 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-245,value:270 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-186,value:271 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-214,value:272 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-106,value:273 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-28,value:274 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-252,value:275 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-194,value:276 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-138,value:277 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-9,value:278 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-136,value:279 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-183,value:278 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-255,value:280 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-152,value:281 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-232,value:283 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-131,value:282 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-31,value:284 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-206,value:285 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-287,value:286 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-126,value:287 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-65,value:288 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-182,value:289 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-229,value:290 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-205,value:289 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-34,value:291 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-121,value:292 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-5,value:294 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-11,value:293 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-233,value:295 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-217,value:296 2018-08-30 22:12:24 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-99,value:297
查看日志發現普通的SSH環境在service與dao是單例的情況下，如果存在成員變量存在線程安全問題，結果不是我們預期的結果。
2.解決線程安全問題的簡單辦法
解決辦法一:線程同步sychronized
代碼修改為下面代碼:
package cn.qlq.dao;
import java.util.concurrent.atomic.AtomicInteger;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Repository;
@Repository
public class UserDaoImpl implements UserDao {
private static Logger log = LoggerFactory.getLogger(UserDaoImpl.class);
private int i = 1;
public UserDaoImpl() {
System.out.println("-----call UserDaoImpl 無參構造");
}
@Override
public synchronized void saveUser() {
log.info("------threamName:{},value:{}", Thread.currentThread().getName(), String.valueOf(i++));
}
}
清空日志，重啟服務進行測試，日志如下:
2018-08-30 22:22:58 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-288,value:1 ... 2018-08-30 22:23:01 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-41,value:290 2018-08-30 22:23:01 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-299,value:291 2018-08-30 22:23:01 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-100,value:292
.... 2018-08-30 22:23:45 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-40,value:599 2018-08-30 22:23:45 [cn.qlq.dao.UserDaoImpl]-[INFO] ------threamName:http-nio-80-exec-104,value:600
發現解決線程安全的問題。
解決辦法二:使用JDK并發包的AtomicInteger代替in型
package cn.qlq.dao;
import java.util.concurrent.atomic.AtomicInteger;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Repository;
@Repository
public class UserDaoImpl implements UserDao {
private static Logger log = LoggerFactory.getLogger(UserDaoImpl.class);
private AtomicInteger i = new AtomicInteger(1);
public UserDaoImpl() {
System.out.println("-----call UserDaoImpl 無參構造");
}
@Override
public void saveUser() {
log.info("------threamName:{},value:{}", Thread.currentThread().getName(), String.valueOf(i.incrementAndGet()));
}
}
總結:
對于SSH模式的應用，在dao層和service層也存在線程安全問題，所以在dao層和service層我們一般不會定義成員變量，以確保線程安全。但是在Action層由于是多例，一個請求一個實例，所以不會產生現場安全問題。因為操作的就不是同一個實例。
解決線程安全的方法可以是加synchronized關鍵字或者使用JDK并發包下的AtomicXXX類代替原來的數據類型。
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