SpringBoot2 学习10 Controller接收参数的方式

港控/mmm° 2021-09-19 14:02 444阅读 0赞

# 地址传值 #

@PathVariable  
获取路径参数。即url/\{id\}这种形式。

# ? 传值 #

@RequestParam  
获取查询参数。即url?name=这种形式

用注解@RequestParam绑定请求参数到方法入参  
当请求参数username不存在时会有异常发生,可以通过设置属性required=false解决,例如: @RequestParam(value=“username”, required=false)

# Body参数 #

//application/jason  
@PostMapping(path = “/demo1”)  
public void demo1(@RequestBody Person person) \{

# 无注解（form提交） #

//form-data  
@PostMapping(path = “/demo1”)  
public void demo1(Person person) \{

# 请求头参数以及Cookie #

@RequestHeader  
2、@CookieValue  
例子  
java代码：

@GetMapping("/demo3")  
public void demo3(@RequestHeader(name = “myHeader”) String myHeader,  
@CookieValue(name = “myCookie”) String myCookie) \{  
System.out.println(“myHeader=” + myHeader);  
System.out.println(“myCookie=” + myCookie);  
也可以这样

@GetMapping("/demo3")  
public void demo3(HttpServletRequest request) \{  
System.out.println(request.getHeader(“myHeader”));  
for (Cookie cookie : request.getCookies()) \{  
if (“myCookie”.equals(cookie.getName())) \{  
System.out.println(cookie.getValue());

//请求头参数以及Cookie
        @RequestMapping("request5")
        public String test5(@RequestHeader(name ="Header") String Header,
                            @CookieValue(name ="cookie1") String cookie1,
                            @CookieValue(name ="cookie2") String cookie2){
            return "Header:"+Header+"cookie1:"+cookie1+"cookie2"+cookie2;
        }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2gzNTYzNjM_size_16_color_FFFFFF_t_70]

//Cookie
        @GetMapping("/ee")
        public String ee(@RequestHeader(name="myHeader") String myHeader,@CookieValue(name="myCookie") String myCookie){
            System.out.println("myHeader=" + myHeader);
            System.out.println("myCookie=" + myCookie);
            return "---------"+myHeader+"============="+myCookie;
        }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2gzNTYzNjM_size_16_color_FFFFFF_t_70 1]

# 表单的参数写在Controller相应的方法的形参中 #

适用于get方式提交，不适用于post方式提交。  
/\*\*  
\* 1.直接把表单的参数写在Controller相应的方法的形参中  
\* @param username  
\* @param password  
\* @return  
\*/  
@RequestMapping("/addUser1")  
public String addUser1(String username,String password) \{  
System.out.println(“username is:”+username);

# @ModelAttribute注解获取POST请求的FORM表单数据 #

/\*\*  
\* 使用@ModelAttribute注解获取POST请求的FORM表单数据  
\* @param user  
\* @return  
\*/  
@RequestMapping(value="/addUser5",method=RequestMethod.POST)  
public String addUser5(@ModelAttribute(“user”) UserModel user) \{  
System.out.println(“username is:”+user.getUsername());  
System.out.println(“password is:”+user.getPassword());  
return “demo/index”;

# 测试代码 #

Controller

package com.zz.controller;
    
    import java.util.HashMap;
    import java.util.Map;
    
    import com.zz.entity.User;
    import org.springframework.web.bind.annotation.*;
    
    @RestController
    @RequestMapping("test")
    public class TestController {
    
    	//路径传值
    	@RequestMapping("t1/{p1}")
    	public Map t1(@PathVariable("p1") String paramter1){
    		Map map=new HashMap();
    		map.put("rs",paramter1);
    		return  map;
    	}
    	//? 传值
    	@RequestMapping("t2")
    	public Map t2(@RequestParam("p1") String paramter1)
    	{
    		System.out.println(paramter1);
    		Map map=new HashMap();
    		map.put("rs",paramter1);
    		return  map;
    	}
    
    	//Body参数
    //application/jason
    	@RequestMapping("t3")
    	public Map t3(@RequestBody User person){
    
    		Map map=new HashMap();
    		map.put("rs",person.getName());
    		return  map;
    	}
    //	无注解（form提交）
    	//form-data
    	@RequestMapping("t4")
    	public Map t4(User person){
    
    		Map map=new HashMap();
    		map.put("rs",person.getName());
    		return  map;
    	}
    
    //	请求头参数以及Cookie
    	@RequestMapping("t5")
    	public Map t5(@RequestHeader(name ="myHeader") String myHeader,
    					 @CookieValue(name = "myCookie") String myCookie){
    		System.out.println("myHeader=" + myHeader);
    		System.out.println("myCookie=" + myCookie);
    		Map map=new HashMap();
    		map.put("rs",myHeader);
    		return  map;
    	}
    
    //	表单的参数写在Controller相应的方法的形参中
    //	适用于get方式提交，不适用于post方式提交。
    	@RequestMapping("t6")
    	public Map t6(String name,String pwd){
    
    		Map map=new HashMap();
    		map.put("rs",name);
    		return  map;
    	}
    
    }

HTML

<!DOCTYPE html>
    <html>
    <head>
        <title>Bootstrap 实例</title>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
        <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
        <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.bundle.min.js"></script>
        <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
    </head>
    <body>
    
    <div class="container">
        <h2>测试</h2>
        <button type="button" id="t1" class="btn">t1</button>
        <button type="button" id="t2" class="btn btn-primary">t2</button>
        <button type="button" id="t3" class="btn btn-secondary">t3</button>
        <button type="button" id="t4" class="btn btn-success">t4</button>
        <button type="button" id="t5" class="btn btn-info">t5</button>
        <button type="button" id="t6" class="btn btn-warning">t6</button>
    </div>
    <script>
    $(document).ready(function(){
    // 在这里写你的代码...
    $("#t1").click(function(){
        $.get("test/t1/jacky", function(data){
            alert("Data Loaded: " + data.rs);
        });
    })
    
        $("#t2").click(function(){
            $.get("test/t2?p1=jerry", function(data){
                alert("Data Loaded: " + data.rs);
            });
        })
    
    
        $("#t3").click(function(){
            var data =  {"name" :"petter","pwd" : "123"}
            $.ajax({
                url : "test/t3",
                async : false,
                type : "POST",
                contentType : 'application/json',
                dataType : 'json',
                data :JSON.stringify(data),
                success : function(data) {
                    alert("Data Loaded: " + data.rs);
                }
            });
        })
        $("#t4").click(function(){
            var data =  {"name" :"petter","pwd" : "123"}
            $.ajax({
                url : "test/t4?name=jacky",
                async : false,
                type : "POST",
                contentType : 'form-data',
                success : function(data) {
                    alert("Data Loaded: " + data.rs);
                }
            });
        })
    // 暂时不通
        $("#t5").click(function(){
            var data =  {"name" :"petter","pwd" : "123"}
            $.ajax({
                url : "test/t5",
                async : false,
                type : "POST",
                contentType : 'application/json',
                dataType : 'json',
                headers: {
    
                    'Header':"from header",
                    'Cookie':'sdfs'
                },
                data :JSON.stringify(data),
                success : function(data) {
                    alert("Data Loaded: " + data.rs);
                }
            });
        })
        $("#t6").click(function(){
            $.get("test/t6?name=jerry&pwd=234", function(data){
                alert("Data Loaded: " + data.rs);
            });
        })
    
    });
    </script>
    </body>
    </html>

# SpringBoot Form post 提交 跳转失败 解决办法 #

报错日志：tSupportedException: Request method ‘POST’ not supported  
解决： post controller方法里面 通过 return “redirect:/index/toIndex”; 执行get的跳转controller

package com.zz.controller;/**
     * @Description: 描述
     * @Author: Bsea
     * @CreateDate: ${Date}
     */
    
    import com.zz.config.DataValidationException;
    import com.zz.entity.Member;
    import com.zz.form.MemberForm;
    import com.zz.service.MemberService;
    import com.zz.util.FormUtil;
    import com.zz.util.ResultVOUtil;
    import com.zz.vo.ResultVO;
    import io.swagger.annotations.Api;
    import io.swagger.annotations.ApiImplicitParam;
    import io.swagger.annotations.ApiImplicitParams;
    import io.swagger.annotations.ApiOperation;
    import org.springframework.beans.BeanUtils;
    import org.springframework.data.domain.Page;
    import org.springframework.stereotype.Controller;
    import org.springframework.validation.BindingResult;
    import org.springframework.web.bind.annotation.*;
    
    import javax.annotation.Resource;
    import javax.validation.Valid;
    /**
     * @Description: java类作用描述
     * @Author: Bsea
     * @CreateDate: 2019/10/16$ 21:27$
     */
    @Api(value = "会员控制器")
    @Controller
    @RequestMapping("index")
    public class IndexController {
        @Resource
        MemberService memberService;
    
        @ApiOperation(value = "添加会员", notes = "根据名字查找会员")
        @ApiImplicitParam(name = "name", value = "会员名字", required = true, dataType = "String",paramType = "path")
        @PostMapping("add")
        public String  add(@Valid MemberForm member, BindingResult bindingResult){
            System.out.println(member);
            if(bindingResult.hasErrors()){
                throw new DataValidationException("验证错误");
            }
            Member member1=new Member();
            BeanUtils.copyProperties(member,member1);
            if(memberService.add(member1)!=null){
                return "redirect:/index/toIndex";
            }else{
                return "redirect:/index/toIndex";
            }
        }
        @RequestMapping("toIndex")
        public String toIndex(){
            return "/index2.html";
        }
    }

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![在这里插入图片描述][20200624163829447.jpg]

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