ajax+post+json+@requestBody走天下

1. 什麼js對象，json對象，json字符串？它們又長什麼樣呢？
   js對象：jsObj
   json對象：jsonObj
   json字符串：jsonString
   

2. ajax如何發post？

   1：定義json對象var obj = {"factoryId":Id};
   2：寫$.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”);
   }
   })

解釋一波:ajax可以發送三種格式的請求+數據

：post+json字符串（最常用的方式）
：post+json對象
：get+查詢字符串

3.@requestBody接收json字符串
點擊：Understanding @RequestBody
網上幾乎博客的思路都是：在Java服務端見一個bean或java對象類，MappingJacksonHttpMessageConverter會將json數據轉換成這個java對象來屬性值。
官方對@requestBody的解釋是：
（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

看這個下面這個舉例，可以知道可以直接獲取基本數據類型String，並不是只可以獲取引用類型（java對象）

比如：我要獲取factortId的值，我的方法參數類型就得是擁有factortId屬性的Factory類，

@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實體類

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;
    }
}