一、非JSON方式接收请求参数

1、普通方式-请求参数名和Controller方法的参数一致

• Controller代码实现

@RestController
@RequestMapping("/param")
@Slf4j
public class TestParamsController {
    @GetMapping("/add")
    public String addEmployee(String lastName,String email){
        return "lastName:"+lastName+",email:"+email;
    }
}

• 测试展示

http://127.0.0.1:8080/param/add?lastName=旺旺&email=33453432@qq.com

image

2、对象方式-请求参数名和Controller方法中的对象的参数一致

• Employee实体类

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Employee {
    private Integer id;
    private String lastName;
    private Integer gender;
    private String email;
    private Integer dId;
}

• Controller代码实现

@RestController
@RequestMapping("/test")
@Slf4j
public class ParamsController {
    @GetMapping("/employee")
    public String addEmployee(Employee employee){
        return "lastName:"+employee.getLastName()+",email:"+employee.getEmail();
    }
}

• 测试展示

http://127.0.0.1:8080/test/employee?lastName=战三&email=33453432@qq.com

image

3、自定义方法参数名-当请求参数名与方法参数名不一致时

注意可以在参数中增加@RequestParam注解。如果在方法中的参数增加了该注解，说明请求的url必须带该带有该参数，否则不能执行该方法。如果在方法中的参数没有增加该注解，说明请求的url无需带有该参数，也能继续执行该方法。

• @RequestParam(defaultValue="0")可设置默认值(仅当传入参数为空时)。

• @RequestParam(value="id")可接受传入参数为id的值，覆盖该注解注释的字段。

• @RequestParam(name="name",defaultValue = "李四") String u_name 如果传入字段”name”为空，默认u_name的值为”李四”。若传入”name”不为空，默认u_name值为传入值。

• 正常入参，两个参数都必传，且@RequestParam不写别名则代表该参数必传

@RestController
@RequestMapping("/office")
@Slf4j
public class TestController {
    @GetMapping("/deport")
    public String addEmployee(@RequestParam("name") String lastName,@RequestParam String email){
        return "lastName:"+lastName+",email:"+email;
    }
}

• 正确请求

http://127.0.0.1:8080/office/deport?name=张三&email=34453432@qq.com

image

• 请求入参不用name代替lastName

http://127.0.0.1:8080/office/deport?lastName=张三&email=34453432@qq.com

报错：

image

• 必传参数不传

http://127.0.0.1:8080/office/deport?name=张三

报错：

image

4、@PathVariable获取路径中的参数接收

• Controller代码实现

public class EmpController{

    @Autowired
    EmployeeMapper employeeMapper;

    @GetMapping("/emp/{id}")
    public Employee getEmpById(@PathVariable("id") Integer id){
        log.info("查询顾客");
        return employeeMapper.getEmpById(id);
    }

• 测试请求

http://127.0.0.1:8080/emp/1

image

二、JSON格式接收请求入参

1、JSON格式接收普通对象

• Cotroller代码实现

@RestController
@RequestMapping("/resp")
@Slf4j
public class ParamsRespController {
    @PostMapping("/test")
    public String addEmployee(@RequestBody Employee employee){
        return "lastName:"+employee.getLastName()+",email:"+employee.getEmail();
    }
}

• 测试请求

http://127.0.0.1:8080/resp/test

image

2、JSON格式接收List对象

• Controller代码实现

@RestController
@RequestMapping("/resplist")
@Slf4j
public class ParamsRespListController {
    @PostMapping("/testlist")
    public String addEmployee(@RequestBody List<Employee> employees){
        StringBuilder sb = new StringBuilder("{");
        if( null != employees){
            for(Employee employee:employees){
                sb.append("{"+"lastName:"+employee.getLastName()+",email:"+employee.getEmail()+"}");
            }
        }
        sb.append("}");
        return sb.toString();

    }
}

• 测试请求

http://127.0.0.1:8080/resplist/testlist

image

3、JSON格式接收Map对象

• Controller代码实现

@RestController
@RequestMapping("/respmap")
@Slf4j
public class ParamsRespMapController {
    @PostMapping("/testmap")
    public String addEmployee(@RequestBody Map<String,Employee> employees){
        StringBuilder sb = new StringBuilder("[");
        if( null != employees){
            for(Map.Entry<String,Employee> employeeEntry : employees.entrySet()){
                sb.append(employeeEntry.getKey()+":"+employeeEntry.getValue()+",");
            }
        }
        sb.append("]");
        return sb.toString();
    }
}

• 测试请求

http://127.0.0.1:8080/respmap/testmap

image