SpringBoot003-优快云博客

本文深入讲解了通过URL进行参数传递的方法，包括GET和POST请求的使用技巧，演示了如何在不同场景下有效利用URL参数，如路径参数、查询参数及JSON格式参数。

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url传参

1.get方式

 	// 访问：http://localhost:8080/test/get/xxx
    @GetMapping("/get/{name}")
    public String get(@PathVariable("name") String name2){
        System.out.println("name: "+ name2);
        return "Hi "+ name2;
    }

    // 访问：http://localhost:8080/test/get2?name=yyy
    @GetMapping("/get2")
    // 请求参数名字与方法中的形参一致，可以省略@RequestParam
    // public String get2(String name2) {
    public String get2(@RequestParam("name") String name2) {
        System.out.println("name: "+ name2);
        return "Hi "+ name2;
    }

    @GetMapping("/get3")
    //给一个默认值或者required = false
    public String get3(@RequestParam(value = "name", defaultValue = "admin") String name) {
        System.out.println("name: "+ name);
        return "Hi "+ name;
    }

2.post方式

    @PostMapping("/post")
    //@RequestParam同get
    public String post(@RequestParam("username") String name, Integer age){
        log.info("name=" + name+", age=" + age);
        return "name=" + name+", age=" + age;
    }
    
    @PostMapping("post2")
    public String post2(HttpServletRequest request) {
        ServletInputStream is = null;
        StringBuilder sb = null;
        try {
            is = request.getInputStream();
            sb = new StringBuilder();
            byte[] buf = new byte[1024];
            int len = 0;
            while ((len = is.read(buf)) != -1){
                sb.append(new String(buf,0,len));
            }
            System.out.println(sb.toString());
            return sb.toString();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (is != null) {
                    is.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }

    @PostMapping("/post3")
    public String post3(@RequestBody User user) {
        log.info(user.toString());
        return null;
    }