Java后端接收数组或对象

曾经终败给现在 2022-11-03 15:29 250阅读 0赞

**1.前端不做处理，**

var roleIds = new Array();
       $("input[name='uRole']:checked").each(function(index,element){ 
           let roleId = $(element).attr("data-roId");
           roleIds[index] = roleId;
       });
       $.ajax({ 
           type: "post",
           url: baseUrl + "/userManage/updateUserRole",//对应controller的URL
           async: true,
           dataType: 'json',
           data: { 
               "array": roleIds
           },
           success:

**后端接收：**

String[] array = req.getParameterValues("array[]");
            if (!StringUtils.isEmpty(array))
                for (String string : array) { 
                    System.out.println("直接获取传递的数组参数："+string);
                }
            else
                System.out.println("直接获取传递的数组参数为空");

**2.以json字符串形式传递到Java后端**

$.ajax({ 
           type: "post",
           url: baseUrl + "/userManage/updateUserRole",//对应controller的URL
           async: true,
           dataType: 'json',
           contentType : "application/json",
           data: JSON.stringify(roleIds),//json对象转化为json字符串
           success: function (ret) { 
               console.log(ret);
           }

**后端接收：**

@RequestMapping(value = "/updateUserRole")
       @ResponseBody
       public String updateUserRole(HttpServletRequest req,@RequestBody String[] roleIdsss) { 
           if (!StringUtils.isEmpty(roleIdsss))
               for (int i = 0; i < roleIdsss.length; i++) { 
                   String idsss = roleIdsss[i];
                   System.out.println("requestBody获取传递的json数组参数：" + idsss);
               }
           else
               System.out.println("requestBody获取传递的json数组参数为空");

**两种post请求的content-type不同  
后端使用java对象接收  
前端js 传递json字符串，设置contentType:“application/json”：**

var dataObj = { 
           "userName":username,
           "phone":phone,
           "id":uId
       }
       var dataJsonStr = JSON.stringify(dataObj);
       console.log(dataJsonStr);
       $.ajax({ 
           type:"post",
           url:baseUrl+"/userManage/updateSyeUser",//对应controller的URL
           async:true,
           contentType : "application/json",
           dataType: 'json',
           data: dataJsonStr,
           success:function(ret){

**后台java：需要使用@requestBody**

@RequestMapping(value = "/updateSyeUser",method = RequestMethod.POST)
       @ResponseBody
       public Map<String,Object> updateSyeUser(@RequestBody SysUser sysUser){ //