SSM中前台传数组。后台接受的问题

<dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.8</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.8</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.8</version>
        </dependency>

$("#del_btu").click(function () {
                    alert("---------------------------------");
                    var data = new Array();
                    $("input[name=‘ids‘]:checked").each(function (i) {
                        data[i]= $(this).val();
                    });
                    console.log(data);
                    if(confirm("您确定要删除吗？")){
                        $.ajax({
                            type:"POST",
                            dataType:"json",
                            contentType: ‘application/json;charset=utf-8‘,//这个必须是这个格式
                            url:"${pageContext.request.contextPath}/user/deleteUsers.do",
                            data:JSON.stringify(data),
                            success:function (date) {
                                    alert("删除失败");
                            },
                            error:function () {
                            }
                        });
                    }
                     
                });

    @RequestMapping(value = "/deleteUsers.do" ,method = RequestMethod.POST)
    @ResponseBody
    public String deleteUsers(@RequestBody String[] ids) throws Exception{
        userService.deleteUsersById(ids);
        return  "true";
    }