java使用webuploader实现跨域上传详解
前言
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:
@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
总结
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