SpringMVC解决跨域问题及CROS

CORS

首先因为最近在做一个前后端分离的项目，分开就意味着可能不在一个域中，所以不可避免的遇到CORS的问题。试过几个方法：

• Spring MVC 4.2.5以后新增的支持跨域的注解@CrossOrigin，如果是老项目的话升级spring库可能会有些兼容的问题，不知为什么这个注解没有升效;
• 用反向代理，这个一定好使的;

• 还有就是我现在使用的，手动增加一个Filter，在Response中增加对跨域的支持，这种方式对老浏览器可能会有问题。

public class CORSFilter implements Filter {
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
    HttpServletResponse response = (HttpServletResponse) res;
    response.setHeader("Access-Control-Allow-Origin", "*");
    response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
    response.setHeader("Access-Control-Max-Age", "3600");
    response.addHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
    chain.doFilter(req, res);
}
public void init(FilterConfig filterConfig) {}
public void destroy() {}
}

web.xml

<filter>
    <filter-name>cors</filter-name>
    <filter-class>xxxx.CORSFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>cors</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

如此即可解决跨域问题。

另外这是一个加了CROS之后的Controller类：

package com.smt.controller;

import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.UUID;

import javax.servlet.http.HttpServletRequest;

import org.apache.log4j.Logger;
import org.eclipse.jetty.server.Request;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartFile;

import com.iflytek.voicecloud.model.Message;
import com.smt.pojo.FlyEvent;
import com.smt.pojo.Txjp;
import com.smt.service.IIflyService;
import com.smt.service.ITxjpService;

@CrossOrigin(origins = "*", maxAge = 3600)
@RestController
@RequestMapping("/ifly")
public class IflyController {
    private static final Logger LOGGER = Logger.getLogger(IflyController.class);

    @Autowired
    private IIflyService iflyService;

    @RequestMapping(path="/goFly")
    public @ResponseBody String showUserInfos(@RequestParam("file") CommonsMultipartFile file,String empid,HttpServletRequest request){
        String path = request.getSession().getServletContext().getRealPath("upload");
        String filename = "";
        LOGGER.info(path);
        InputStream fis = null;
        try {
            Date d = new Date();
            SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
            fis = file.getInputStream();
            filename = empid+sdf.format(d)+".mp3";
            iflyService.saveFile(fis, filename, path);
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }finally{
            if(fis != null){
                try {
                    fis.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }

        FlyEvent model = new FlyEvent();
        model.setiId(UUID.randomUUID().toString());
        model.setiDate(new Date());
        model.setiUrl("/upload/"+filename);
        model.setiUserId(empid);
        iflyService.saveEvent(model);

        String json = "暂无";
        try {
            Message mes = iflyService.upload(path+"\\"+filename);
            LOGGER.info("上传状态码："+mes.getOk());
            if(mes.getOk() == 0){
                model.setiWorkId(mes.getData());
                iflyService.updateEvent(model);
//                LOGGER.info("开始等待...");
//                Thread.sleep(10000);
//                LOGGER.info("结束等待...");
//                Message res = iflyService.result(mes.getData());
//                if(res.getOk() == 0){
//                    json = res.getData();
//                    LOGGER.info("翻译结果："+json);
//                    model.setiContent(json);
//                    iflyService.updateEvent(model);
//                }else{
//                    LOGGER.error("返回报错："+res.getFailed());
//                }
            }else{
                LOGGER.error("上传报错："+mes.getFailed());
            }
        } catch (Exception e) {
            LOGGER.error("抛出异常："+e.getMessage());
        }

        return json;
    }
}

其中@CrossOrigin(origins = "*", maxAge = 3600)注解是支持所有域，但是很显然不好使。

@RestController是REST模式，也就是类似于.NET里面的WebApi。