java实现webuploader跨域上传

项目中使用webuploader进行文件上传，需要用到跨域，查看webuploader的issues发现是支持上传的，但是他们写的回复都是不清不白的，有点迷糊；想了半天才知道咋回事，也可能是我比较笨，再次记录下java中详细的处理。

webuploader进行上传，会执行2个请求；一个option请求，一个post（根据你的webuploader的配置method 值决定），需要在option请求中对响应头进行处理，post响应头也进行响应的处理。

以servlet为例：

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@WebServlet(description = "文件上传",value = {"/file/upload"})
public class FileUpload extends HttpServlet {

    public FileUpload() {
        super();
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setHeader("Access-Control-Allow-Origin", "*");
        resp.setHeader("Access-Control-Allow-Methods", "*");
        resp.setHeader("Access-Control-Allow-Headers", "x-requested-with,content-type");
        resp.setContentType("application/json");
        resp.setCharacterEncoding("utf-8");
        //文件上传逻辑


    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doOptions(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setHeader("Access-Control-Allow-Credentials", "false");
        resp.setHeader("Access-Control-Allow-Origin", "*");
        resp.setHeader("Access-Control-Allow-Methods", "*");
        resp.setHeader("Access-Control-Allow-Headers", "x-requested-with,content-type");
        resp.setContentType("application/json");
        resp.setCharacterEncoding("utf-8");
        super.doOptions(req, resp);
    }

再次测试跨域上传，正常