小编Rit*_*esh的帖子

long stime=System.currentTimeMillis();
for(int i=0;i<500000;i++)
{
  String s1="Hello";
  String s2="Hello";
}
 long etime=System.currentTimeMillis();
 System.out.println("Time diff"+(etime-stime));
long stime1=System.currentTimeMillis();
for(int i=0;i<500000;i++)
{
  String s3=new String("Hello");
  String s4=new String("Hello");
}
 long  etime1=System.currentTimeMillis();
 System.out.println("Time diff"+(etime1-stime1));

实际上我在这两种情况下得到的答案都是0.在这两种情况下为什么为零

似乎dispatcher-servlet无法使用执行组件扫描.

 <context:component-scan  base-package="abc" />

在我的控制器文件(HelloController.java)下包abc.代码编写如下:

@Controller
@RequestMapping("/hello")
public class HelloController {

@RequestMapping(method = RequestMethod.GET)
public String printHello(ModelMap model) {
    model.addAttribute("message", "Hello Spring MVC Framework!");
    return "hello"; //I have already made hello.jsp in web-inf/jsp/
 }
}

我的应用程序名称是SpringMiddle.当尝试url为:

http://localhost:8080/SpringMiddle/hello.htm

我在web.xml中有以下url模式

 <servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>*.htm</url-pattern>
</servlet-mapping>

它显示我找不到HTTP 404错误.

编辑::它告诉我警告

WARNING:   No mapping found for HTTP request with URI [/SpringMiddle/hello.htm] in DispatcherServlet with name 'dispatcher'