ajax 中application/json,ajax请求头添加contentType:“application/json“的作用

请求例子:

$.ajax({

dataType:'json',

url:"../rest/test",

dataType:"JSON",

async:false,

type:"POST",

contentType:"application/json",   //

data:JSON.stringify({"id":"1"}),  //如果不添加  contentType:"application/json" 则data必须是json对象，应该是{"id"："1"}

success : function(result){

console.log(result);

if(result.successful){

alert("删除成功！");

getTableData();

}else{

alert("删除失败！");

}

},

error:function(){

alert("删除失败！");

}

请求端：如果添加contentType:"application/json" ，则请求参数是json格式的字符串。如果不添加，入参是json对象。

接收端：

不添加添加contentType:"application/json":

方法一：

@RequestMapping(value = "/test", method = RequestMethod.POST)

public @ItemResponseBody Object removeProject(HttpServletRequest request) {

BufferedReader reader = null;

String line = "";

String xmlString = null;

try {

reader = request.getReader();

StringBuffer inputString = new StringBuffer();

while ((line = reader.readLine()) != null) {

inputString.append(line);

}

xmlString = inputString.toString();

} catch (Exception e) {

//                    throw new YppException(PayException.xmlParseError);

}

Map result = new HashMap();

result.put("result","succes");

return result;

}

方法二：

@RequestMapping(value = "/test", method = RequestMethod.POST)

public @ItemResponseBody Object editProject(@RequestBody Map map) {

String id=map.get("id").toString();

Map result = new HashMap();

result.put("result","succes");

return result;

}

添加添加contentType:"application/json"：

@RequestMapping(value = "/test", method = RequestMethod.POST)

public @ItemResponseBody Object getCommonValue(HttpServletRequest request) {

String sspm = request.getParameter("id")==null?"":request.getParameter("id");

Map result = new HashMap();

result.put("result","success");

return result;

}