URL请求参数传递

原SupController代码：

点击展开代码 
    
    package com.example.mystore.controller;
    import org.springframework.ui.Model;  // 必须是这个！
    import com.example.mystore.core.Result;
    import com.example.mystore.entity.Supplier;
    import com.example.mystore.service.SupService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.*;
    @Controller
    public class SupController {
    @Autowired
    private SupService supService;
        @GetMapping("/index")
        public String init(Model model){
            Result result = new Result();
            result.setCode(100);
            result.setMsg("初始状态");
            model.addAttribute("result",result);
            return "index";
        }
        @RequestMapping("/check")
        public String loginCheck(Model model, Supplier supplier){
            model.addAttribute("scode",supplier.getScode());
            model.addAttribute("spassword",supplier.getSpassword());
            Result result = supService.checkSupplier(supplier);
            model.addAttribute("result",result);
            if (result.getCode() == 200) {
                Supplier supObj = (Supplier) result.getData();
                model.addAttribute("sname", supObj.getSname());
                model.addAttribute("sweixin", supObj.getSweixin());
                model.addAttribute("tel", supObj.getTel());
                return "home";
            }else return "index";
        } 
    }

1.形参名（无注解）接收参数

（1）控制器编程

修改控制器SupController，代码如下

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@RestController
@RequestMapping("index")
public class SupController {
    @Autowired
    private SupService supService;

//形参名（无注解）接受参数
    @RequestMapping("/check")
    public Result loginCheck(String scode,String spassword){
        Supplier supplier = new Supplier();
        supplier.setScode(scode);
        supplier.setSpassword(spassword);
        Result result = supService.checkSupplier(supplier);
        return result;
    }
}

（2）运行

启动项目，打开浏览器，在地址栏中输入http://localhost:8080/index/check?scode=SXLC001A&&spassword=888
运行结果1

（3）说明

1.要求url传递参数名与控制器方法的参数名必须一致
2.参数与路径中间隔一个？，各参数之间用&&或&分隔
3.@RequestMapping(“/check”)可用以下形式代替
@RequestMapping(value = “check” ,method = RequestMethod.GET)
@GetMapping(“/check”)
@GetMapping(value = “check”)

2.路径（@PathVariable）传递参数

(1)控制器编程

在SupController类中添加loginCheckbyPath方法

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//路径@PathVariable传递参数
    @RequestMapping("/checkbypath/{scode}/{spassword}")
    public Result loginCheckByPath(@PathVariable String scode,@PathVariable String spassword){
        Supplier supplier = new Supplier();
        supplier.setScode(scode);
        supplier.setSpassword(spassword);
        Result result = supService.checkSupplier(supplier);
        return result;
    }

(2)运行

启动项目，在浏览器地址栏中输入http://localhost:8080/index/checkbypath/SXLC001A/888
运行结果

3.用@RequestParam映射参数

(1)控制器编程

在SupController类中添加loginCheckByPara方法

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//使用@RequestParam映射参数
    @RequestMapping(value = "checkbypara",method = RequestMethod.GET)
    public Result loginCheckByPara(@RequestParam(value = "scode")String scode,@RequestParam(value = "spassword",required = false ,defaultValue = "888") String spassword){
        Supplier supplier = new Supplier();
        supplier.setScode(scode);
        supplier.setSpassword(spassword);
        Result result = supService.checkSupplier(supplier);
        return result;
    }

(2)运行

启动项目，在浏览器地址栏中输入http://localhost:8080/index/checkbypara?scode=SXLC001A
省略密码回车
运行结果3

4.总结

通过url传递参数有三种方式，一种是直接通过url传递参数，第二种是直接通过路径传递参数，第三种是支持参数映射和默认值的参数传递