Java 从jsp页面检索结果值，并在spring boot中将结果发布到另一个jsp页面

我正在使用spring boot设计BMI计算器页面。我想在另一个jsp文件中显示BMI的结果。 我迷惑了，被击中了中间。以下代码包含jsp页面代码和所有类代码。 我是springboot的初学者，可能犯了一些错误。所以，请帮助我

这是我的JSP页面，包含BMI Calcultor（文件名：BMI.JSP）

这是我的服务类

@Controller
public class OnlineController {

    @RequestMapping(value="/resultpage", method=RequestMethod.POST)
    public String userResult(ModelMap model,@ModelAttribute BMICalciModel bmicalcimodel, BindingResult result,HttpServletRequest request) {
        onlineService.getBMIResult(bmicalcimodel);
        request.setAttribute("mode", "MODE_RESULT");
        model.addAttribute("res",bmicalcimodel.getResult());
        return "resultpage";
    }

@Service
public class OnlineService {
public String getBMIResult(BMICalciModel bmicalcimodel) {
        String result = null;
        if(bmicalcimodel.getResult()<18.5) {
            result = "Oh My God! You are UNDERWEIGHT! Have some healthy food and gain weight!";
        }
        else if (bmicalcimodel.getResult()>= 18.5 && bmicalcimodel.getResult()<25) {
            result = "Congrats! You are perfect with your BMI! Eat healthy and stay fit!";
        }
        else if (bmicalcimodel.getResult()>= 25 && bmicalcimodel.getResult()<30){
            result = "The time has come to wear your gym shoes and reduce your fat! Your BMI shows that you are OVERWEIGHT!!";
            }
        else {
            result = "Please enter correct height and weight!";
        }
        return result;
        
    }
}

import java.util.Locale;

public class BMICalciModel {

    public int age;
    public String gender;
    public float height;
    public float weight;
    public float result;
    
    
    
    public BMICalciModel() {
        super();
    }
    
    
    public BMICalciModel(int age, String gender, float height, float weight, float result) {
        super();
        this.age = age;
        this.gender = gender;
        this.height = height;
        this.weight = weight;
        this.result = result;
    }


    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public float getHeight() {
        return height;
    }
    public void setHeight(float height) {
        this.height = height;
    }
    public float getWeight() {
        return weight;
    }
    public void setWeight(float weight) {
        this.weight = weight;
    }
    public float getResult() {
        return result;
    }
    public void setResult(float result) {
        this.result = result;
    }
    private float calci() {
        result = weight/(height/100*height/100);
        return fixedToTwo(result);
    }
    private float fixedToTwo(float num) {
        return Float.valueOf(String.format(Locale.getDefault(), "%.2f", num));
    }
}

application.properties使用正确的前缀和后缀创建

---

请给我一个解决方案，在另一个给定的jsp页面中显示我的bmi结果值

您的

bmi.jsp

没有任何

表单

标签您如何向控制器提交数据？我现在添加了

表单

标签……请检查我的意思是说

这个标签？目前您的代码是否转到控制器？

@Service
public class OnlineService {
public String getBMIResult(BMICalciModel bmicalcimodel) {
        String result = null;
        if(bmicalcimodel.getResult()<18.5) {
            result = "Oh My God! You are UNDERWEIGHT! Have some healthy food and gain weight!";
        }
        else if (bmicalcimodel.getResult()>= 18.5 && bmicalcimodel.getResult()<25) {
            result = "Congrats! You are perfect with your BMI! Eat healthy and stay fit!";
        }
        else if (bmicalcimodel.getResult()>= 25 && bmicalcimodel.getResult()<30){
            result = "The time has come to wear your gym shoes and reduce your fat! Your BMI shows that you are OVERWEIGHT!!";
            }
        else {
            result = "Please enter correct height and weight!";
        }
        return result;
        
    }
}

import java.util.Locale;

public class BMICalciModel {

    public int age;
    public String gender;
    public float height;
    public float weight;
    public float result;
    
    
    
    public BMICalciModel() {
        super();
    }
    
    
    public BMICalciModel(int age, String gender, float height, float weight, float result) {
        super();
        this.age = age;
        this.gender = gender;
        this.height = height;
        this.weight = weight;
        this.result = result;
    }


    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public float getHeight() {
        return height;
    }
    public void setHeight(float height) {
        this.height = height;
    }
    public float getWeight() {
        return weight;
    }
    public void setWeight(float weight) {
        this.weight = weight;
    }
    public float getResult() {
        return result;
    }
    public void setResult(float result) {
        this.result = result;
    }
    private float calci() {
        result = weight/(height/100*height/100);
        return fixedToTwo(result);
    }
    private float fixedToTwo(float num) {
        return Float.valueOf(String.format(Locale.getDefault(), "%.2f", num));
    }
}