Spring@Controller 与@RestController的区别

一时失言乱红尘 2022-01-22 15:49 256阅读 0赞

首先我们来看下这两个注解的定义：

**目录**

@Controller

@RestController

分析说明

--------------------

## @Controller ##

//
    // Source code recreated from a .class file by IntelliJ IDEA
    // (powered by Fernflower decompiler)
    //
    
    package org.springframework.stereotype;
    
    import java.lang.annotation.Documented;
    import java.lang.annotation.ElementType;
    import java.lang.annotation.Retention;
    import java.lang.annotation.RetentionPolicy;
    import java.lang.annotation.Target;
    import org.springframework.core.annotation.AliasFor;
    
    @Target({ElementType.TYPE})
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    @Component
    public @interface Controller {
        @AliasFor(
            annotation = Component.class
        )
        String value() default "";
    }

## @RestController ##

//
    // Source code recreated from a .class file by IntelliJ IDEA
    // (powered by Fernflower decompiler)
    //
    
    package org.springframework.web.bind.annotation;
    
    import java.lang.annotation.Documented;
    import java.lang.annotation.ElementType;
    import java.lang.annotation.Retention;
    import java.lang.annotation.RetentionPolicy;
    import java.lang.annotation.Target;
    import org.springframework.core.annotation.AliasFor;
    import org.springframework.stereotype.Controller;
    
    @Target({ElementType.TYPE})
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    @Controller
    @ResponseBody
    public @interface RestController {
        @AliasFor(
            annotation = Controller.class
        )
        String value() default "";
    }

## 分析说明 ##

@RestController 主要是针对数据接口使用应为它标注了@Controller和@ResponseBody注解，而@Controller主要实现静态URL的映射和使用@Component实现Java类的注入。

在使用的时候一定要注意用法，请看如下示例：

package com.boonya.springboot.mybatis.sbmybatis.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.servlet.ModelAndView;
    
    //@RestController
    @Controller
    @RequestMapping
    public class MainController {
    
        /*************@RestController 注解需要的写ModelAndView**********/
       /* @RequestMapping("/")
        public ModelAndView root(){
            return new ModelAndView("/index");
        }
    
        @RequestMapping("/index")
        public ModelAndView index(){
            return new ModelAndView("index");
        }*/
    
        /*************@Controller 注解只需要写文件名字符串返回即可**********/
    
        @RequestMapping("/")
        public String root(){
            return "redirect:/index";
        }
    
        @RequestMapping("/index")
        public String index(){
            return "index";
        }
    
    }