//表单
<form action="/showUser" method="get" id="select">
<span>用户名：</span>
<input type="text"  name="name" placeholder="请输入用户名"/>
<input type="button"  onclick="submitForm()" value="查询"/>
<a href="userAdd.html">添加用户</a>
</form>

//js代码
<script>
    function submitForm(){
        //获取form表单对象,提交选择项目
        var form = document.getElementById("select");
        form.submit();//form表单提交
    }
</script>

//service层代码

public PageInfo<SmbmsUser> showUser(int pageNum,String name){
    //当前页 页面容量
    PageHelper.startPage(pageNum,5);

    Example example = new Example(SmbmsUser.class);
    Example.Criteria criteria = example.createCriteria();

    if (!StringUtils.isEmpty(name)){
        //通过用户名模糊查询
        criteria.andLike("username",'%' + name + '%');
    }

    List<SmbmsUser> smbmsUsers = smbmsUserMapper.selectByExample(example);
    bindUser(smbmsUsers);
    PageInfo<SmbmsUser> pageInfo = new PageInfo<>(smbmsUsers);
    return  pageInfo;
}