SSM总结

 1    报错： cvc-complex-type.2.4.a: Invalid content was found starting with element 'async-supported'. One of '{"http://java.sun.com/xml/ns/javaee":init-param}' is expected.  
     将<web-app>标签内容换为    

<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"  
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance  
    http://www.springmodules.org/schema/cache/springmodules-cache.xsd http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd"   
     xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee   
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

 2    Referenced file contains errors (http://www.springframework.org/schema/beans/spring-beans-3.1.xsd)        MyEcilpse2017里面则是在Preferences 中搜索关键字“Validation”，然后在里面把XML schema的两个勾去掉就OK

3     Spring常用注解     https://blog.csdn.net/sysware_carol/article/details/52793164

4    JsonConfig中setExcludes方法的使用   https://blog.csdn.net/finality_000/article/details/36418655      

　　JsonConfig cfg = new JsonConfig();　　

　　cfg.setExcludes(new String[] { "d" });             

　　使用JsonValueProcessor将date转换成希望的类型   https://www.cnblogs.com/zhujiabin/p/5142891.html

JSONObject result=new JSONObject();
        JsonConfig jsonConfig=new JsonConfig();
        jsonConfig.setExcludes(new String[]{"customer"});
        jsonConfig.registerJsonValueProcessor(java.util.Date.class, new DateJsonValueProcessor("yyyy-MM-dd"));  //详见工具类
        JSONArray jsonArray=JSONArray.fromObject(contactList,jsonConfig);

5     前端的日期格式回传处理

@InitBinder
    public void initBinder(WebDataBinder binder) {
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        dateFormat.setLenient(false);
        binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));   //true:允许输入空值，false:不能为空值
    }

 6      mybatis在Mapper.xml文件中使用大于,小于时要用 &gt; &lt;   

    <if test="createTimefrom!=null and createTimefrom!='' ">
          and createTime &gt;= #{createTimefrom}
    </if>
    <if test="createTimeto!=null and createTimeto!='' ">
          and createTime &lt;= #{createTimeto}
    </if>

 7    MyBatis+MySQL 返回插入的主键ID      https://blog.csdn.net/dyllove98/article/details/8866357       useGeneratedKeys="true" keyProperty="id"

 8    transferto()方法，是springmvc封装的方法，用于图片上传时，把内存中图片写入磁盘      

          

@RequestMapping("/save")
    public String save(@RequestParam("imageFile") MultipartFile imageFile,Blogger blogger,HttpServletRequest request,HttpServletResponse response)throws Exception{
        if(!imageFile.isEmpty()){
            String filePath=request.getServletContext().getRealPath("/");
            String imageName=DateUtil.getCurrentDateStr()+"."+imageFile.getOriginalFilename().split("\.")[1];
            imageFile.transferTo(new File(filePath+"static/userImages/"+imageName));
            blogger.setImageName(imageName);
        }
        int resultTotal=bloggerService.update(blogger);
        StringBuffer result=new StringBuffer();
        if(resultTotal>0){
            result.append("<script language='javascript'>alert('修改成功！');</script>");
        }else{
            result.append("<script language='javascript'>alert('修改失败！');</script>");
        }
        ResponseUtil.write(response, result);
        return null;
    }