解决跨域问题的方式

方式1.利用spring中的一个注解@CrossOrigin（推荐）

将该注解加到controller上，如下：

@Controller
@CrossOrigin
@Scope("prototype")
@RequestMapping(value="/test")
public class HelloWorldController {
    @RequestMapping(value="/users/{userName}", method=RequestMethod.GET)
    public @ResponseBody User findUser(@PathVariable("userName") String userName) {
        User user = new User();
        user.setUserName(userName);
        user.setSex("男");
        System.out.println(123456789);
        return user;
    }
}

方式2.加过滤器filter

首先添加一个过滤器类类似下面：

package com.ygz.filter;//所在的包


import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;

public class CorsFilter implements Filter {

    @Override
    public void destroy() {
        // TODO Auto-generated method stub

    }

    @Override
    public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
            throws IOException, ServletException {
        // TODO Auto-generated method stub
        HttpServletResponse httpServletResponse = (HttpServletResponse) arg1;
        httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");
        arg2.doFilter(arg0, httpServletResponse);
    }

    @Override
    public void init(FilterConfig arg0) throws ServletException {
        // TODO Auto-generated method stub

    }

}　　

然后在web.xml中添加filter过滤器如下即可：

    <filter>
        <filter-name>corsFilter</filter-name>
        <filter-class>spring.mvc.filter.CorsFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>corsFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>