ResponseEntity返回数据、状态、头部信息

曾经终败给现在 2022-04-08 10:15 524阅读 0赞

### ResponseEntity ：标识整个http相应：状态码、头部信息、响应体内容(spring) ###

### @ResponseBody：加在请求处理方法上，能够处理方法结果值作为http响应体（springmvc） ###

### @ResponseStatus：加在方法上、返回自定义http状态码(spring) ###

ResponseEntity 事例：

import com.baidu.item.pojo.Category;
    import com.baidu.item.service.CategoryService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.http.HttpStatus;
    import org.springframework.http.ResponseEntity;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.List;
    
    /**
     * @ Author     ：ssw
     * @ Date       ：Created in 10:37 2018/12/11
     */
    @RestController
    @RequestMapping("category")
    public class CategoryController {
    
        @Autowired
        private CategoryService categoryService;
    
        @GetMapping("list")
        public ResponseEntity<List<Category>> queryByParentId(@RequestParam(value = "pid",defaultValue = "0") Long pid){
            List<Category> categories = this.categoryService.queryByParentId(pid);
            if (categories != null && 0!=categories.size()) {
                //返回数据就为http响应体内容
                return ResponseEntity.ok(categories);
            }
            //返回响应状态码204
            return ResponseEntity.status(HttpStatus.NO_CONTENT).build();
        }}

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