Springmvc ajax请求400

传JSON对象

前端

function test () {
var param = {username : "yitop"}; $.ajax({
timeout : 20000,
type : "POST",
dataType : "JSON",
url : "/user/userRole.htm",
data : param,
success : function(data){
alert(data);
}
//注意：这里不能加下面这行，否则数据会传不到后台
//contentType:'application/json;charset=UTF-8',
});
}

后端

Controller:

@RequestMapping(value = "userRole", method = RequestMethod.POST)
@ResponseBody
public List<Role> selectRoles(String username) throws WebTransException { /* 逻辑代码 */}

传JSON字符串+@RequestBody接收

前端

function icheckDelete(url){
var parms = {
list : array //这是个数组
}; $.ajax({
dataType: "JSON",
contentType:'application/json;charset=UTF-8',//关键是要加上这行
traditional:true,//这使json格式的字符不会被转码
data: JSON.stringify(parms),
type: "DELETE",
timeout: 20000,
url: url,
success : function () {
alert("删除成功！");
},
error : function (data){
alert(data.responseText);
}
});}

后端

Controller:

@RequestMapping(value = "deleteList", method = RequestMethod.DELETE)
@ResponseBody
public String delete(@RequestBody DeleteListRequest request) throws WebTransException{ /* 逻辑代码 */ return "success";
}

DeleteListRequest:


public class DeleteListRequest {
List<Map<String, String>> list = new ArrayList<>();
public DeleteListRequest() {
}
public List<Map<String, String>> getList() {
return list;
}
public void setList(List<Map<String, String>> list) {
this.list = list;
}