SpringMVC接收参数具体示例#yyds干货盘点# _springmvc

【SpringMVC接收参数具体示例#yyds干货盘点#】丈夫欲遂平生志，一载寒窗一举汤。这篇文章主要讲述SpringMVC接收参数具体示例#yyds干货盘点#相关的知识，希望能为你提供帮助。
实体类

@Data public class Dept { private Integer deptno; private String dname; private String loc; }

后台控制器

@Controller @RequestMapping("/dept") public class DeptController { @RequestMapping("/add") void add(HttpServletRequest request){ try { ServletInputStream is = request.getInputStream(); String result = new BufferedReader(new InputStreamReader(is)) .lines().collect(Collectors.joining(System.lineSeparator())); System.out.println(result); } catch (IOException e) { e.printStackTrace(); } }@PostMapping(value = "https://www.songbingjia.com/add1") public ModelAndView add1(HttpServletRequest request) { String deptno = request.getParameter("deptno"); String dname = request.getParameter("dname"); String loc = request.getParameter("loc"); Dept dept = new Dept(Integer.parseInt(deptno), dname, loc); return new ModelAndView("/res", "res", dept); }@PostMapping("/add2") public ModelAndView add2(Integer deptno, String dname, String loc) {//前台页面传递过来的数据会自动实例化 Dept dept = new Dept(deptno, dname, loc); return new ModelAndView("/res", "res", dept); }@RequestMapping("/add3") public ModelAndView add3(Dept dept) {//前台页面传递过来的数据会自动实例化 System.out.println(dept); return new ModelAndView("/res", "res", dept); }@RequestMapping("add4") public void add4(Dept dept, HttpServletResponse response) throws IOException {// 变量的名称无所谓，不是必须得和前台页面一致，只要类型不错就行了 response.setContentType("application/json"); PrintWriter out = response.getWriter(); ObjectMapper objectMapper = new ObjectMapper(); String json = objectMapper.writeValueAsString(dept); out.write(json); }@ResponseBody @RequestMapping("add5") public Dept add5(Dept dept) throws IOException {// 变量的名称无所谓，不是必须得和前台页面一致，只要类型不错就行了 return dept; }}

普通表单示例一：后台通过HttpServletRequest获取

< form action="dept/add1" method="post"> < input type="text" name="deptno"> < input type="text" name="dname"> < input type="text" name="loc"> < input type="submit" value="https://www.songbingjia.com/android/添加部门"> < /form>

示例二：后台通过具体的属性获取

< form action="dept/add2" method="post"> < input type="text" name="deptno"> < input type="text" name="dname"> < input type="text" name="loc"> < input type="submit" value="https://www.songbingjia.com/android/添加部门"> < /form>

示例三：后台通过具体的对象获取

< form action="dept/add3" method="post"> < input type="text" name="deptno" id="deptno"> < input type="text" name="dname" id="dname"> < input type="text" name="loc" id="loc"> < input type="submit" value="https://www.songbingjia.com/android/添加部门"> < /form>

示例四：后台通过具体的属性获取

< form> < input type="text" name="deptno"> < input type="text" name="dname"> < input type="text" name="loc"> < input type="button" value="https://www.songbingjia.com/android/添加部门" onclick="add22(); "> < /form> < script> function add22() { let form = document.forms[0]; form.action = "dept/add2"; form.method = "POST"; form.submit(); } < /script>

前台以JSON方式传递数据后台通过具体的对象获取

< form action="dept/add3" method="post"> < input type="text" name="deptno" id="deptno1"> < input type="text" name="dname" id="dname1"> < input type="text" name="loc" id="loc1"> < button id="addBtn"> 添加部门< /button> < /form> < script> $(function () { $("#addBtn").click(function () { let deptno = $("#deptno1").val(); let dname = $("#dname1").val(); let loc = $("#loc1").val(); let dept = {deptno: deptno, dname: dname, loc: loc}; $.ajax({ url: "dept/add4",// 注：add3、add4、add5都可以。 type: "POST", data: dept, success: function (data) { alert(data.deptno + "" + data.dname + "" + data.loc); } }); }); }) < /script>

指定contentType 网页通过JSON形式向后台传递数据

< form id="deptForm2"> < input type="text" name="deptno" id="deptno3"> < input type="text" name="dname" id="dname3"> < input type="text" name="loc" id="loc3"> < input type="button" value="https://www.songbingjia.com/android/添加部门" onclick="add32(); "> < /form> < script> function add32() { let deptno = $("#deptno3").val(); let dname = $("#dname3").val(); let loc = $("#loc3").val(); let dept = {deptno: deptno, dname: dname, loc: loc}; $.ajax({ url: "dept/add1", type: "POST", data: dept, // contentType: "application/json; charset=UTF-8", success: function (data) { alert(data.deptno + "" + data.dname + "" + data.loc); } }); }; < /script>

网页通过key/value形式向后台传递数据

< form id="deptForm1"> < input type="text" name="deptno"> < input type="text" name="dname"> < input type="text" name="loc"> < input type="button" value="https://www.songbingjia.com/android/添加部门" onclick="add31(); "> < /form> < script> function add31() { // let p = $("#deptForm").serialize(); // alert(p)//deptno=32& dname=23& loc=32 $.ajax({ type: "post", dataType: "json", //预期服务器端返回的数据的类型 url: "dept/add2",// add1 - add5都能接收到数据 // contentType: "application/x-www-form-urlencoded",//前端向服务器传递的数据的类型 data: $("#deptForm1").serialize(), success: function (data) { console.info(data); } }) } < /script>

注：

contentType: " application/x-www-form-urlencoded"
- 如果不指定contentType，后台会将接收到的value值赋给Controller方法的对象参数（或封装后赋给Controller方法的对象参数）：
- 如果指定contentType，后台只能将接收到的value值赋给Controller方法的对应参数
contentType: " application/json; charset=UTF-8"
- 如果不指定contentType，1-5都行
- 如果指定contentType，只能通过add获取参数的值
- 若控制器方法对象参数前面加@RequestBody 或@RequestParam，会报xhr。