Spring MVC中前后台数据传输小结-白红宇

Spring MVC中前后台数据传输小结

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发布时间：2019-06-19

本文共 2987 字，大约阅读时间需要 9 分钟。

前台向后台传递参数:

　　@ResponseBody    @RequestMapping(value = "/findById/{id}", method = { RequestMethod.POST,            RequestMethod.GET })    public void findById(@PathVariable("id") Long id) {        Person person=new Person();        person.setId(id);    }

　　访问地址为:项目地址+/findById/1.do

如果参数是一个对象bean:(@RequestBody注解帮助自动封装成bean,前台只需要传递格式正确的json)

@ResponseBody    @RequestMapping(value = "/findById", method = { RequestMethod.POST,            RequestMethod.GET })    public void findById(@RequestBody Person person) {        person.setId(100);    }

如果需要有返回值到前台:(普通bean或者list)

@ResponseBody    @RequestMapping(value = "/findById/{id}", method = { RequestMethod.POST,            RequestMethod.GET })    public Person findById(@PathVariable("id") Long id) {        Person person=new Person();        person.setId(id);        return person;    }

如果需要返回json,先进行配置,用的比较多的应该是下面两种:


             
                  
                       
        
         application/json;charset=UTF-8
                        
        
         text/html;charset=UTF-8
        
                    
               
              
                  
                       
        
         WriteMapNullValue
                        
        
         QuoteFieldNames
                        
        
         DisableCircularReferenceDetect

以及:


             
                  
                       
                    
               
          
         
             
                  
                       
        
         text/html;charset=UTF-8

代码示例:

@ResponseBody    @RequestMapping(value = "/findById/{id}", method = { RequestMethod.POST,            RequestMethod.GET })    public Map findById(@PathVariable("id") Long id) {        Person person=new Person();        person.setId(id);        Map
     
       map = new HashedMap();        map.put("total", "1");        map.put("value", person);        return map;    }

附带mybatis的分页功能

maven包配置:


                 
      
       com.github.pagehelper
                  
      
       pagehelper
                  
      
       3.7.3

service层分页代码示例:

@Override    public ResultBean findByParams(Person person,            HttpServletRequest request) {        int currentPage = Integer.parseInt(request.getParameter("page") == null ?"1":request.getParameter("page"));//当前页        int pageSize    = Integer.parseInt(request.getParameter("rows")== null?"10":request.getParameter("rows"));//每页条数        Page
      page = PageHelper.startPage(currentPage, pageSize);        List
     
       result=personDao.findByParams(person);        Map
      
        resMap = new HashMap
       
        ();        resMap.put("rows",result);        resMap.put("total",page.getTotal());        ResultBean resultBean = new ResultBean();        resultBean.setResultObj(resMap);        return resultBean;    }