Spring Boot 重新導向到別的網址的方式如下。
使用RedirectView可重新導向到指定的url。
package com.abc.demo.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.servlet.view.RedirectView;
@Controller
public class DemoController {
@GetMapping("/redirect")
public RedirectView redirect() {
String url = "https://matthung0807.blogspot.com"
return new RedirectView(url); // 重新導向到指定的url
}
}
或是ModelAndView傳入"redirect:"前墜加上要導向的url字串。
package com.abc.demo.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class DemoController {
@GetMapping("/redirect")
public ModelAndView redirect() {
String url ="https://matthung0807.blogspot.com";
return new ModelAndView("redirect:" + url); // 重新導向到指定的url
}
}
或是回傳"redirect:"前墜加上要導向的url字串。
package com.abc.demo.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
@Controller
public class DemoController {
@GetMapping("/redirect")
public String redirect() {
String url ="https://matthung0807.blogspot.com";
return "redirect:" + url; // 重新導向到指定的url
}
}
或是透過HttpServletResponse設定response header的Location值為重新導向的url及HTTP狀態碼為302 Found(RFC 7231 - 6.4.3)。
package com.abc.demo.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import javax.servlet.http.HttpServletResponse;
@Controller
public class DemoController {
@GetMapping("/redirect")
public void redirect(HttpServletResponse response) {
String url = "https://matthung0807.blogspot.com";
response.setHeader("Location", url); // 重新導向的url
response.setStatus(HttpServletResponse.SC_FOUND); // 302 Found
}
}
重新導向的過程如下：
localhost blogger
+--------+ +--------+ +--------+
| Client | | Server | | Server |
+--------+ +--------+ +--------+
| | |
| | |
|GET http:localhost:8080/redirect HTTP/1.1 | |
+----------------------------------------------->+ |
| | |
| | |
| HTTP/1.1 302 | |
| Location: https://matthung0807.blogspot.com| |
+<-----------------------------------------------+ |
| | |
| | |
| | |
|GET https://matthung0807.blogspot.com HTTP/1.1 | |
+---------------------------------------------------------------->+
| | |
| | |
| | |
| HTTP/1.1 200 OK| |
+<----------------------------------------------------------------+
| | |
| | |
| | |
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