Spring 注解的几种参数用途（@RequestParam @RequestBody）及JSON参数解析

Spring注解中能接受客户端传递过来的参数包括路径变量（url），内容变量（http body），头变量（header），COOKIE变量等几类。

1、路径变量

解析方式：@PathVariable

2、内容变量

（1）格式形如：

POST http://localhost:8090/project-web/api/client/saveDelegateRelationPart HTTP/1.1
Accept: application/json, text/javascript, */*; q=0.01
Content-Type: application/x-www-form-urlencoded; charset=UTF-8

id=692503&consigner=fozzie&proxy=kermit&fullProxy=no&startTime=2016-07-07+00%3A00%3A00&endTime=2016-07-22+00%3A00%3A00&memo=%E6%B7%BB%E5%8A%A0%E9%83%A8%E5%88%86%E4%BB%A3%E7%90%86%E6%B5%8B%E8%AF%95&process=%5B%7B%22id%22%3A%22fixSystemFailure%3A1%3A36%22%2C%22text%22%3A%22fixSystemFailure%22%2C%22pid%22%3A%22Examples%22%7D%2C%7B%22id%22%3A%22reviewSaledLead%3A1%3A39%22%2C%22text%22%3A%22reviewSaledLead%22%2C%22pid%22%3A%22Examples%22%7D%2C%7B%22id%22%3A%22createTimersProcess%3A1%3A38%22%2C%22text%22%3A%22createTimersProcess%22%2C%22pid%22%3A%22Examples%22%7D%2C%7B%22id%22%3A%22employee-productivity-report%3A1%3A46%22%2C%22text%22%3A%22employee-productivity-report%22%2C%22pid%22%3A%22activiti-report%22%7D%2C%7B%22id%22%3A%22task-duration-report%3A1%3A49%22%2C%22text%22%3A%22task-duration-report%22%2C%22pid%22%3A%22activiti-report%22%7D%2C%7B%22id%22%3A%22process-instance-overview-report%3A1%3A47%22%2C%22text%22%3A%22process-instance-overview-report%22%2C%22pid%22%3A%22activiti-report%22%7D%2C%7B%22id%22%3A%22helpdesk-firstline-vs-escalated-report%3A1%3A48%22%2C%22text%22%3A%22helpdesk-firstline-vs-escalated-report%22%2C%22pid%22%3A%22activiti-report%22%7D%5D

解析方式： @RequestParam Map allRequestParams

（2）格式形如：

POST http://localhost:8090/project-web/api/client/queryProxyRelation HTTP/1.1
Accept: application/json, text/javascript, */*; q=0.01
Content-Type: application/json; charset=UTF-8

{"pageIndex":0,"pageSize":10,"sortField":""}

解析方式： @RequestBody Map requestBodyParams

总结：

即若客户端通过POST方法，在http body中传递的参数为key=value表单形式，则可用@RequestParam进行解析；若传递的参数为JSON形式，则使用@RequestBody注解进行解析。

参考：

1、 @RequestParam @RequestBody @PathVariable 等参数绑定注解详解，Truong的专栏，http://blog.csdn.net/truong/article/details/28097837，2014-06-02

2、通过Ajax post Json类型的数据到Controller，瓜王，http://www.cnblogs.com/Benjamin/archive/2013/09/11/3314576.html，2013-09-11

附：

function postSimpleData() {
        $.ajax({
            type: "POST",
            url: "/Service/SimpleData",
            contentType: "application/json", //必须有
            dataType: "json", //表示返回值类型，不必须
            data: JSON.stringify({ 'foo': 'foovalue', 'bar': 'barvalue' }),  //相当于 //data: "{'str1':'foovalue', 'str2':'barvalue'}",
            success: function (jsonResult) {
                alert(jsonResult);
            }
        });
    }
    function postListString() {
        $.ajax({
            type: "POST",
            url: "/Service/ListString",
            contentType: "application/json",
            dataType: "json",
            data: JSON.stringify({ "BuIds": ["1", "2", "3"] }),
            success: function (jsonResult) {
                alert(jsonResult);
            }
        });
    }
    function postEmployees() {
        $.ajax({
            type: "POST",
            url: "/Service/Employees",
            contentType: "application/json",
            dataType: "json",
            data: JSON.stringify({
                "Employees": [
                                    { "firstName": "Bill", "lastName": "Gates" },
                                    { "firstName": "George", "lastName": "Bush" },
                                    { "firstName": "Thomas", "lastName": "Carter" }
                                 ]

            }),
            success: function (jsonResult) {
                alert(jsonResult);
            }
        });
    }