SpringMVC @RequestBody @RequestParam @PathVariable 等参数绑定注解详解

request 数据到handler method 参数数据的绑定所用到的注解和什么情形下使用：

http://blog.csdn.net/walkerjong/article/details/7946109  （关于更多参数绑定常用的注解）

@PathVariable

           $.ajax({
                url: ctx + '/management/cart/delete/'+id,
                async: false,
                cache: false,
                type: "POST",
                success: function (data) {

                },
                error: function (xhr) {

                }
            });

@ResponseBody
@RequestMapping(value = "/delete/{id}", method = RequestMethod.POST)

public int delete(@PathVariable int id){

    return 0;
}
//若方法参数名称和需要绑定的uri template中变量名称不一致，需要在@PathVariable("name")指定uri template中的名称

public int delete(@PathVariable("id") int rsId){

    return 0;
}

@RequestParam

A） 常用来处理简单类型的绑定，通过Request.getParameter() 获取的String可直接转换为简单类型的情况（ String--> 简单类型的转换操作由ConversionService配置的转换器来完成）；因为使用request.getParameter()方式获取参数，所以可以处理get 方式中queryString的值，也可以处理post方式中 body data的值；

B）用来处理Content-Type: 为 application/x-www-form-urlencoded编码的内容，提交方式GET、POST；

C) 该注解有两个属性： value、required； value用来指定要传入值的id名称，required用来指示参数是否必须绑定；

$.ajax({
                url: ctx + '/management/cart/delete?id='+id,
                async: false,
                cache: false,
                type: "POST",
                success: function (data) {

                },
                error: function (xhr) {

                }
            });
@ResponseBody
@RequestMapping(value = "/delete", method = RequestMethod.POST)
public int delete(@RequestParam("id") int id){
    return 0;
}

@RequestBody

该注解常用来处理Content-Type: 不是application/x-www-form-urlencoded编码的内容，而是application/json, application/xml等；

基于ajax的方法请求，将contentType设置为application/json

var cartId = 1;
$.ajax({
                url: ctx + '/management/cart/delete',
                async: false,
                cache: false,
                type: "POST",
                contentType: "application/json",
                data: cartId,
                success: function (data) {

                },
                error: function (xhr) {

                }
            });

@ResponseBody
    @RequestMapping(value = "/delete", method = RequestMethod.POST)
    public int delete(@RequestBody Integer id) {
        return 0;
    }

@RequestBody接收的是一个Json对象的字符串，而不是一个Json对象。然而在ajax请求往往传的都是Json对象，后来发现用 JSON.stringify(data)的方式就能将对象变成字符串。同时ajax请求的时候也要指定contentType:"application/json" 这样就可以轻易的将一个对象或者List传到Java端，使用@RequestBody即可绑定对象或者List.

var  params = [1,2,3];
$.ajax({
                url: ctx + '/management/cart/delete',
                async: false,
                cache: false,
                type: "POST",
                contentType: "application/json",
                data: JSON.stringify(params),
                success: function (data) {

                },
                error: function (xhr) {

                }
            });
@ResponseBody
    @RequestMapping(value = "/deletes", method = RequestMethod.POST)
    public int deletes(@RequestBody List<Integer> ids) {
        return 0;
    }

@ResponseBody
    @RequestMapping(value = "/create", method = RequestMethod.POST)
    public int create(@RequestBody ExtTaskAssignmentCfg extTaskAssignmentCfg) {
        UserInfo userInfo = contextService.getContextUserInfo();
        extTaskAssignmentCfg.setInsman(userInfo.getUsername());
        extTaskAssignmentCfg.setInsdate(new Date());
        return this.extTaskAssignmentCfgService.insert(extTaskAssignmentCfg);
    }

var jsonObject = {};
            jsonObject.id = assignmentCfgId;
            jsonObject.activitiId = activityId;
            jsonObject.configurationDetail = configurationDetail;
            var jsonStr = JSON.stringify(jsonObject);
            $.ajax({
                url: url,
                async: false,
                cache: false,
                type: "POST",
                contentType:"application/json",
                data: jsonStr,
                success: function (data) {
                },
                error: function (xhr) {
                    alert("保存受理人分配配置失败")
                }
            })

@RequestMapping(value = "saveUser", method = {RequestMethod.POST }})
    @ResponseBody
    public void saveUser(@RequestBody List<User> users) {
         userService.batchSave(users);
    }

var saveDataAry=[];
        var data1={"userName":"test","address":"gz"};
        var data2={"userName":"ququ","address":"gr"};
        saveDataAry.push(data1);
        saveDataAry.push(data2);
        $.ajax({
            type:"POST",
            url:"user/saveUser",
            dataType:"json",
            contentType:"application/json",
            data:JSON.stringify(saveDataAry),
            success:function(data){ 

            }
         });