Spring Boot Enums枚举参数传递

一.情景说明

二.如何将请求参数中的字符串转换为枚举

$title(pom.xml)
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.devglan</groupId>
    <artifactId>spring-mvc-enum-example</artifactId>
    <version>0.1.0</version>

	<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.3.RELEASE</version>
    </parent>
	
    <dependencies>
		<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
		
		<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </dependency>
		
    </dependencies>

</project>

$title(Application.java)
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

}

$title(QuestionCategory.java)
import java.util.Arrays;

public enum QuestionCategory {
	
	CSE("cse"),ECE("ece");
	
	private String value;

	private QuestionCategory(String value) {
		this.value = value;
	}

	public static QuestionCategory fromValue(String value) {
		for (QuestionCategory category : values()) {
			if (category.value.equalsIgnoreCase(value)) {
				return category;
			}
		}
		throw new IllegalArgumentException(
				"Unknown enum type " + value + ", Allowed values are " + Arrays.toString(values()));
	}

}

$title(Question.java)
public class Question {
	
	private QuestionCategory type;
	private String question;
	private String answer;
	
	public QuestionCategory getType() {
		return type;
	}
	public void setType(QuestionCategory type) {
		this.type = type;
	}
	public String getQuestion() {
		return question;
	}
	public void setQuestion(String question) {
		this.question = question;
	}
	public String getAnswer() {
		return answer;
	}
	public void setAnswer(String answer) {
		this.answer = answer;
	}

}

import java.util.ArrayList;
import java.util.List;

import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
$title(QuestionController.java)
import com.devglan.model.Question;
import com.devglan.model.QuestionCategory;
import com.devglan.model.QuestionCategoryConverter;

@RestController
public class QuestionController {

	@RequestMapping(value = "/{type}", method = RequestMethod.GET)
	public List get(@PathVariable(value = "type") QuestionCategory category) {
		return getQuestionsByCategory(category);
	}

	private List getQuestionsByCategory(QuestionCategory category) {
		List questions = new ArrayList();
		Question question = new Question();
		question.setType(category);
		if(category == QuestionCategory.CSE){
			question.setQuestion("What is Operating System.");
			question.setAnswer("This is the answer of what is os.");
		} else if(category == QuestionCategory.ECE){
			question.setQuestion("What is a transistor.");
			question.setAnswer("This is the answer of what is transistor.");
		}
		questions.add(question);
		return questions;
	}
	
	@InitBinder
	public void initBinder(final WebDataBinder webdataBinder) {
		webdataBinder.registerCustomEditor(QuestionCategory.class, new QuestionCategoryConverter());
	}

}

$title(QuestionCategoryConverter.java)
import java.beans.PropertyEditorSupport;

public class QuestionCategoryConverter extends PropertyEditorSupport{

	 public void setAsText(final String text) throws IllegalArgumentException {
	        setValue(QuestionCategory.fromValue(text));
	    }

}

三.测试

spring boot Enums

http://blog.xqlee.com/article/569.html