2016年09月18日工作日志

今天遇到一个很恶心的问题，从ios发过来的post请求怎么都无法识别，可是在web端发送确实很正常的。过程如下：

1.在chrome浏览器里随便打开一个网页，F12打开控制台，然后植入jquery

var fileref=document.createElement('script'); 

fileref.setAttribute("type","text/javascript"); 

fileref.setAttribute("src", 'http://libs.baidu.com/jquery/1.9.1/jquery.js'); 

document.getElementsByTagName("head")[0].appendChild(fileref); 

2.发送post请求

$.post(    
     "http://192.168.2.4/app/api/blackList/query/name",   
      {name: "王刚", currentPage: "1"},
      function (txt) {
        console.log(txt);
      }
)

返回的数据正常：

Paste_Image.png

通过打断点调试发现，

ios端发来的请求>content-type：application/json
web方式发来的请求>content-type:application/x-www-form-urlencoded; charset=UTF-8

到这里，问题就好解决了，前者是一个字符串，可以在代码里加上@RequestBody实现转换，同时，将web传递的content-type修改一下即可（不能直接使用$.post，这对于开发者而言可不够友好）

$.ajax(
  {
   type: "post",
   contentType:"application/json",
   url: "http://192.168.2.4/app/api/blackList/query/name",
   data: JSON.stringify({name:"王刚",currentPage:"1"}),
   success: function(data){
      console.log(data)
    }
 }
)

斟酌再三，决定还是保留对传统web端jquery.post()方式的支持，同时支持ios序列化传递过来的参数，第一版先进行header判断，遇到application/json的content-type，就从request取出inputstream，手动转化
controller的代码如下：

@ApiOperation(value = "姓名查询", notes = "首次访问时currentPage传1")
@ApiImplicitParams({
       @ApiImplicitParam(name = "name", value = "名称", required = true, dataType = "String"), 
       @ApiImplicitParam(name = "currentPage", value = "当前是第几页", required = true, dataType = "String")})
@PostMapping(value = "/api/blackList/query/name")
public String nameQuery(BlackListParam param, HttpServletRequest request) throws IOException {
    String contentType = request.getHeader("Content-Type");
    if (contentType.endsWith("application/x-www-form-urlencoded")) {
    } else if (contentType.endsWith("application/json")) {
        String string = HttpToolkit.getContent(request.getInputStream(), "UTF-8");
        param = mapper.readValue(string, BlackListParam.class);
    }
    logger.info("进入nameQuery,name=" + param.getName() + "¤tPage=" + param.getCurrentPage());
    int currentPageInt = Integer.parseInt(param.getCurrentPage());
    String result = blackListApiService.nameQuery(param.getName(), currentPageInt);
    return result;}

HttpToolkit里面的getContent部分的代码：

public static String getContent(InputStream is, String charset) {
    String pageString = null;
    InputStreamReader isr = null;
    BufferedReader br = null;
    StringBuffer sb = null;
    try {
        isr = new InputStreamReader(is, charset);
        br = new BufferedReader(isr);
        sb = new StringBuffer();
        String line = null;
        while ((line = br.readLine()) != null) {
            sb.append(line + "\n");
        }
        pageString = sb.toString();
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            if (is != null){
                is.close();
            }
            if(isr!=null){
                isr.close();
            }
            if(br!=null){
                br.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        sb = null;
    }
    return pageString;
}