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"}) publicclassFileUploadextendsHttpServlet{ publicFileUpload(){ super(); } @Override protectedvoiddoPost(HttpServletRequestreq,HttpServletResponseresp)throwsServletException,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 protectedvoiddoGet(HttpServletRequestreq,HttpServletResponseresp)throwsServletException,IOException{ doPost(req,resp); } @Override protectedvoiddoOptions(HttpServletRequestreq,HttpServletResponseresp)throwsServletException,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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