Java Spring MVC Controller：“返回转发”、“返回重定向”和“返回jsp文件”有什么区别
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Spring MVC Controller: what is the difference between "return forward", "return redirect" and "return jsp file"
提问by Argamidon
I don't understand what I should use. I have two pages - intro.jsp(1) and booksList.jsp(2). For each page I created one Controller Class. The first page has button which opens second page:
我不明白我应该使用什么。我有两页 - intro.jsp(1) 和 booksList.jsp(2)。对于每一页，我创建了一个控制器类。第一页有打开第二页的按钮：
<form method="GET" action="/request-list">
<input type="submit"/>
</form>
The first question is:I am not sure about correctness this button. It works well, but I have question mark after press this button.
第一个问题是：我不确定这个按钮的正确性。它运作良好，但按下此按钮后我有问号。
The second question is:When I press that button, method with next annotation is called (Controller for the second page):
第二个问题是：当我按下那个按钮时，带有下一个注释的方法被调用（第二页的控制器）：
@RequestMapping(value = "/books")
@Controller
public class BooksListController {
@RequestMapping
public String booksList() {
return "jsp/books/booksList";
}
}
What should I return by this method? In other words how can I jump from first page to second one?
我应该通过这种方法返回什么？换句话说，我怎样才能从第一页跳到第二页？
return "redirect:/books"; returns http://localhost:8080/books?return "jsp/books/booksList"; returns http://localhost:8080/request-list?return "forward:/books"; returns http://localhost:8080/request-list?
return "redirect:/books"; returns http://localhost:8080/books?return "jsp/books/booksList"; returns http://localhost:8080/request-list?return "forward:/books"; returns http://localhost:8080/request-list?
I see that result is the same: all these Strings gave me the same page (page 2 was opened). In which cases I should use "redirect", "forward", "page.jsp"?
我看到结果是一样的：所有这些字符串都给了我相同的页面（打开了第 2 页）。在哪些情况下我应该使用“重定向”、“转发”、“page.jsp”？
Also I've read Post/Redirect/Get article. Do I have to use "redirect" after POST method handling??
我也读过发布/重定向/获取文章。POST 方法处理后是否必须使用“重定向”？
采纳答案by Marcelo Keiti
The first question is: I am not sure about correctness this button. It works well, but I have question mark after press this button.
第一个问题是：我不确定这个按钮的正确性。它运作良好，但按下此按钮后我有问号。
Ok, it's insert a question mark because you use GET http method. You need to use POST method to pass the data in the request payload.
好的，这是插入一个问号，因为您使用的是 GET http 方法。您需要使用 POST 方法在请求负载中传递数据。
return "redirect:/books";
It returns to the client (browser) which interprets the http response and automatically calls the redirect URL
它返回给客户端（浏览器），客户端（浏览器）解释 http 响应并自动调用重定向 URL
return "jsp/books/booksList";
It process the JSP and send the HTML to the client
它处理 JSP 并将 HTML 发送到客户端
return "forward:/books";
It transfer the request and calls the URL direct in the server side.
它传输请求并直接在服务器端调用 URL。
To decide which one to use you have to consider some aspects of each approach:
要决定使用哪一种，您必须考虑每种方法的某些方面：
Forward: is faster, the client browser is not involved, the browser displays the original URL, the request is transfered do the forwarded URL.
转发：更快，客户端浏览器不参与，浏览器显示原始URL，请求转发做转发的URL。
Redirect: is slower, the client browser is involved, the browser displays the redirected URL, it creates a new request to the redirected URL.
重定向：较慢，涉及客户端浏览器，浏览器显示重定向的 URL，它创建对重定向 URL 的新请求。
