ajax+post+json+@requestBody走天下

1. 什么js对象，json对象，json字符串？它们又长什么样呢？
   js对象：jsObj
   json对象：jsonObj
   json字符串：jsonString
   

2. ajax如何发post？

   1：定义json对象var obj = {"factoryId":Id};
   2：写$.ajax

   $.ajax({
   type:”POST”,
   url: “/ASW/wxcurrent.html”,
   data:JSON.stringify(jsonObj),
   dataType: “json”,
   contentType:”application/json”,
   success:function(result){
   console.log(success);
   },
   error:function(){
   alert(“error”);
   }
   })

解释一波:ajax可以发送三种格式的请求+数据

：post+json字符串（最常用的方式）
：post+json对象
：get+查询字符串

3.@requestBody接收json字符串
点击：Understanding @RequestBody
网上几乎博客的思路都是：在Java服务端见一个bean或java对象类，MappingJacksonHttpMessageConverter会将json数据转换成这个java对象来属性值。
官方对@requestBody的解释是：
（1）For access to the HTTP request body. Body content is converted to the declared method argument type using HttpMessageConverters.

（2）The @RequestBody method parameter annotation indicates that a method parameter should be bound to the value of the HTTP request body

看这个下面这个举例，可以知道可以直接获取基本数据类型String，并不是只可以获取引用类型（java对象）

比如：我要获取factortId的值，我的方法参数类型就得是拥有factortId属性的Factory类，

@RequestMapping(value = "/wxcurrent",method=RequestMethod.POST,consumes="application/json")
@ResponseBody
public void wxfactoryCur(@RequestBody Factory factory, HttpServletResponse response) {
    System.out.println("factory:"+factory);
    System.out.println("factoryId:"+factory.getFactoryId());
}

Factory实体类

package cn.edu.hdu.Entity;

public class Factory {
    private Integer factoryIndex;
    private Integer factoryId;
    private String systemName;
    private String pc_ph;
    private Integer modelNum;
    private Integer modelId;

    public Integer getFactoryIndex() {
        return this.factoryIndex;
    }

    public void setFactoryIndex(Integer factoryIndex) {
        this.factoryIndex = factoryIndex;
    }

    public Integer getFactoryId() {
        return this.factoryId;
    }

    public void setFactoryId(Integer factoryId) {
        this.factoryId = factoryId;
    }

    public String getSystemName() {
        return this.systemName;
    }

    public void setSystemName(String systemName) {
        this.systemName = systemName;
    }

    public String getPc_ph() {
        return this.pc_ph;
    }

    public void setPc_ph(String pc_ph) {
        this.pc_ph = pc_ph;
    }

    public Integer getModelNum() {
        return this.modelNum;
    }

    public void setModelNum(Integer modelNum) {
        this.modelNum = modelNum;
    }

    public Integer getModelId() {
        return this.modelId;
    }

    public void setModelId(Integer modelId) {
        this.modelId = modelId;
    }
}