java - How to send the returned boolean result from controller to view in spring mvc

Java - How to send the returned boolean result from controller to view in spring mvc

In Spring MVC, you can send the returned boolean result from a controller to a view by adding it to the model and then accessing it in the view. Here's how you can achieve this:

  1. Controller: Add the boolean result to the model.

  2. View: Access the boolean result from the model and use it as needed.

Here's a simple example:

Controller:

import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.GetMapping; @Controller public class MyController { @GetMapping("/check") public String check(Model model) { // Perform some operation to get a boolean result boolean result = performCheck(); // Add the boolean result to the model model.addAttribute("result", result); // Return the name of the view return "checkResult"; } // Method to simulate some operation that returns a boolean result private boolean performCheck() { // Simulate some operation // For example, checking if a condition is true return true; } }

View (checkResult.html):

<!DOCTYPE html> <html lang="en" xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"> <title>Check Result</title> </head> <body> <h1>Check Result</h1> <!-- Access the boolean result from the model --> <p th:if="${result}">Operation was successful!</p> <p th:unless="${result}">Operation failed!</p> </body> </html>

In this example:

  • The check method in the controller performs some operation to get a boolean result (result).
  • The boolean result is added to the model using model.addAttribute("result", result).
  • The controller returns the name of the view (checkResult) where the boolean result will be displayed.
  • In the view (checkResult.html), Thymeleaf syntax is used to access the boolean result from the model. Depending on the value of result, different messages are displayed using th:if and th:unless attributes.

You can use other view technologies like JSP or plain HTML with Spring MVC in a similar way by accessing the model attribute accordingly.

Examples

  1. Spring MVC send boolean result from controller to view

    • Description: Demonstrates how to send a boolean result from a Spring MVC controller to a view.
    • Code:
      @Controller public class MyController { @RequestMapping("/checkBoolean") public String checkBoolean(Model model) { boolean result = // Your boolean result here model.addAttribute("result", result); return "myView"; } } 
      <!-- myView.jsp --> <html> <body> <c:if test="${result}"> Boolean result is true </c:if> <c:if test="${!result}"> Boolean result is false </c:if> </body> </html>

  2. Spring MVC pass boolean value from controller to Thymeleaf template

    • Description: Shows how to pass a boolean value from a Spring MVC controller to a Thymeleaf template.
    • Code:
      @Controller public class MyController { @RequestMapping("/checkBoolean") public String checkBoolean(Model model) { boolean result = // Your boolean result here model.addAttribute("result", result); return "myTemplate"; } } 
      <!-- myTemplate.html --> <!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <body> <div th:if="${result}">Boolean result is true</div> <div th:unless="${result}">Boolean result is false</div> </body> </html>

  3. Spring MVC send boolean result via ModelAndView to view

    • Description: Illustrates how to send a boolean result from a Spring MVC controller to a view using ModelAndView.
    • Code:
      @Controller public class MyController { @RequestMapping("/checkBoolean") public ModelAndView checkBoolean() { boolean result = // Your boolean result here ModelAndView modelAndView = new ModelAndView("myView"); modelAndView.addObject("result", result); return modelAndView; } } 
      <!-- myView.jsp --> <html> <body> <c:if test="${result}"> Boolean result is true </c:if> <c:if test="${!result}"> Boolean result is false </c:if> </body> </html>

  4. Spring MVC send boolean value as JSON response from controller

    • Description: Shows how to send a boolean value as a JSON response from a Spring MVC controller.
    • Code:
      @RestController public class MyController { @RequestMapping("/checkBoolean") public boolean checkBoolean() { return // Your boolean result here } }
      This approach returns the boolean value directly as JSON.

  5. Spring MVC send boolean result using ResponseEntity to view

    • Description: Demonstrates how to send a boolean result from a Spring MVC controller to a view using ResponseEntity.
    • Code:
      @Controller public class MyController { @RequestMapping("/checkBoolean") public ResponseEntity<String> checkBoolean() { boolean result = // Your boolean result here if (result) { return ResponseEntity.ok("Boolean result is true"); } else { return ResponseEntity.ok("Boolean result is false"); } } }

  6. Spring MVC pass boolean value as model attribute to view

    • Description: Illustrates how to pass a boolean value as a model attribute from a Spring MVC controller to a view.
    • Code:
      @Controller public class MyController { @RequestMapping("/checkBoolean") public String checkBoolean(Model model) { boolean result = // Your boolean result here model.addAttribute("result", result); return "myView"; } } 
      <!-- myView.jsp --> <html> <body> <c:if test="${result}"> Boolean result is true </c:if> <c:if test="${!result}"> Boolean result is false </c:if> </body> </html>

  7. Spring MVC pass boolean value as request parameter to view

    • Description: Shows how to pass a boolean value as a request parameter from a Spring MVC controller to a view.
    • Code:
      @Controller public class MyController { @RequestMapping("/checkBoolean") public String checkBoolean(HttpServletRequest request) { boolean result = // Your boolean result here request.setAttribute("result", result); return "myView"; } } 
      <!-- myView.jsp --> <html> <body> <c:if test="${param.result == 'true'}"> Boolean result is true </c:if> <c:if test="${param.result == 'false'}"> Boolean result is false </c:if> </body> </html>

  8. Spring MVC send boolean value as AJAX response from controller

    • Description: Demonstrates how to send a boolean value as an AJAX response from a Spring MVC controller.
    • Code:
      @Controller public class MyController { @RequestMapping("/checkBoolean") @ResponseBody public boolean checkBoolean() { return // Your boolean result here } }

  9. Spring MVC pass boolean value as path variable to view

    • Description: Illustrates how to pass a boolean value as a path variable from a Spring MVC controller to a view.
    • Code:
      @Controller public class MyController { @RequestMapping("/checkBoolean/{result}") public String checkBoolean(@PathVariable("result") boolean result, Model model) { model.addAttribute("result", result); return "myView"; } } 
      <!-- myView.jsp --> <html> <body> <c:if test="${result}"> Boolean result is true </c:if> <c:if test="${!result}"> Boolean result is false </c:if> </body> </html>

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