- 我們先看一種最普通的情況 model和Controller都是單例
@Component
public class Order {
private String orderNum = "12";
public String getOrderNum() {
return orderNum;
}
public void setOrderNum(String orderNum) {
this.orderNum = orderNum;
}
@Override
public String toString() {
return "Order{" +
"orderNum='" + orderNum + '\'' +
'}';
}
}
@Controller
@RequestMapping(value = "/api")
public class MainController {
@Autowired
private Order order;
private String name;
@RequestMapping(value = "/users/{username}",method = RequestMethod.GET)
@ResponseBody
public String userProfile(@PathVariable("username") String username) {
name = username;
order.setOrderNum( name);
try {
for(int i = 0; i < 100; i++) {
System.out.println(Thread.currentThread().getId() + "name:" + name + "--order:" + order.getOrderNum());
Thread.sleep(2000);
}
} catch (Exception e) {
}
return order.toString();
}
}
我們分別發送兩個請求
http://localhost:8080/api/users/aaa
http://localhost:8080/api/users/bbb
29name:aaa--order:aaa
29name:aaa--order:aaa
29name:aaa--order:aaa
31name:bbb--order:bbb
29name:bbb--order:bbb
31name:bbb--order:bbb
可以看到當第二個請求發送后，29線程里的name和order都發生了改變，因為當前的Order和Controller都是單例
- 情況二 model是單例 Controller不是單例
@Component
public class Order {
private String orderNum = "12";
public String getOrderNum() {
return orderNum;
}
public void setOrderNum(String orderNum) {
this.orderNum = orderNum;
}
@Override
public String toString() {
return "Order{" +
"orderNum='" + orderNum + '\'' +
'}';
}
}
@Controller
@RequestMapping(value = "/api")
@Scope("prototype")
public class MainController {
@Autowired
private Order order;
private String name;
@RequestMapping(value = "/users/{username}",method = RequestMethod.GET)
@ResponseBody
public String userProfile(@PathVariable("username") String username) {
name = username;
order.setOrderNum( name);
try {
for(int i = 0; i < 100; i++) {
System.out.println(Thread.currentThread().getId() + "name:" + name + "--order:" + order.getOrderNum());
Thread.sleep(2000);
}
} catch (Exception e) {
}
return order.toString();
}
}
28name:aaa--order:aaa
28name:aaa--order:aaa
29name:bbb--order:bbb
28name:aaa--order:bbb
29name:bbb--order:bbb
28name:aaa--order:bbb
可以看到第二個請求發送后，28線程中的name還是aaa沒有發生變化，而order受到了影響，發生了變化，因為Controller是一個新的，所以name也是一個新的變量，但是order是單例的
3.情況三 model不是單例 Controller是單例
@Component
@Scope("prototype")
public class Order {
private String orderNum = "12";
public String getOrderNum() {
return orderNum;
}
public void setOrderNum(String orderNum) {
this.orderNum = orderNum;
}
@Override
public String toString() {
return "Order{" +
"orderNum='" + orderNum + '\'' +
'}';
}
}
@Controller
@RequestMapping(value = "/api")
public class MainController {
@Autowired
private Order order;
private String name;
@RequestMapping(value = "/users/{username}",method = RequestMethod.GET)
@ResponseBody
public String userProfile(@PathVariable("username") String username) {
name = username;
order.setOrderNum( name);
try {
for(int i = 0; i < 100; i++) {
System.out.println(Thread.currentThread().getId() + "name:" + name + "--order:" + order.getOrderNum());
Thread.sleep(2000);
}
} catch (Exception e) {
}
return order.toString();
}
}
29name:aaa--order:aaa
29name:aaa--order:aaa
30name:bbb--order:bbb
29name:bbb--order:bbb
30name:bbb--order:bbb
可以看到name和order都變了，可見只設置Model是沒有用的
4.情況四 Controller和Model都設置不是單例
@Component
@Scope("prototype")
public class Order {
private String orderNum = "12";
public String getOrderNum() {
return orderNum;
}
public void setOrderNum(String orderNum) {
this.orderNum = orderNum;
}
@Override
public String toString() {
return "Order{" +
"orderNum='" + orderNum + '\'' +
'}';
}
}
@Controller
@RequestMapping(value = "/api")
@Scope("prototype")
public class MainController {
@Autowired
private Order order;
private String name;
@RequestMapping(value = "/users/{username}",method = RequestMethod.GET)
@ResponseBody
public String userProfile(@PathVariable("username") String username) {
name = username;
order.setOrderNum( name);
try {
for(int i = 0; i < 100; i++) {
System.out.println(Thread.currentThread().getId() + "name:" + name + "--order:" + order.getOrderNum());
Thread.sleep(2000);
}
} catch (Exception e) {
}
return order.toString();
}
}
28name:aaa--order:aaa
28name:aaa--order:aaa
29name:bbb--order:bbb
28name:aaa--order:aaa
29name:bbb--order:bbb
28name:aaa--order:aaa
這樣29請求的和28請求的就完全分開了
