CORS跨域问题常⽤解决⽅法代码实例
⼀后端服务器使⽤过滤器
新建过滤器:
/**
* 解决跨域
*/
public class AccessControlAllowOriginFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException { }
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
System.out.println("解决跨域请求");
HttpServletResponse response = (HttpServletResponse) servletResponse;
response.setHeader("Access-Control-Allow-Origin", "*");//允许所有⽹站跨域访问
response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
response.setHeader("Access-Control-Allow-Credentials", "true");    //这⾥如果前端请求header⾸字母是⼩写也是不⾏得，所以⼤⼩写都写上就没问题了
response.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin,content-type,x-requested-with,Content-Type,Access-Control-Allow-Headers,Content-Length,Accept,Authorization,X-Requested-With");    filterChain.doFilter(servletRequest, response);
}
@Override
public void destroy() {}
}
前端header需要添加:
$.ajax( {
url : 'c2.zhuzher/pdm/know/active?hotelid=808047&sdate=2019-11-09&edate=2019-11-11',
beforeSend: function (xhr) {
xhr.setRequestHeader("Access-Control-Allow-Origin", "*"); //设置跨域访问信息
xhr.setRequestHeader("Content-Type", "application/json;charset=utf-8");
},
type : 'get',
dataType : 'json',
mvc实例
data:{},
success : function(data) {
alert(1111);
}
});
⼆后端接⼝springboot/springmvc使⽤注解
springMVC的版本要在4.2或以上版本才⽀持@CrossOrigin ;
⽅法需要指明Get或者POST才⾏:
三本地nginx反向代理(推荐)
本地下载解压nginx，添加⼀个server配置⽂件:
注意，如果是放在nginx的html⽬录下⼀般是不需要加跨域配置的，否则会报配置多余错误
每次可先直接使⽤试试，不⾏再加下⾯add_header等配置.
###start跨域⽀持配置####
add_header Access-Control-Allow-Origin '*';
add_header Access-Control-Allow-Headers Accept,Origin,X-Requested-With,Content-Type,If-Modified-Since,Last-Modified,Content-Length,Content-Range,Range,Content-Description,Content-Disposition;
add_header Access-Control-Allow-Methods GET,POST,PUT,DELETE,OPTIONS;
add_header Access-Control-Request-Headers Content-Disposition;
add_header Access-Control-Allow-Credentials true;
###end ###
server {
listen    80;
server_name 127.0.0.1;
#charset koi8-r;
#access_log logs/host.access.log main;
location / {
root  html;
index index.html index.htm;
}
#⾃定义本地路径，代理转发请求
location /pdm    {
proxy_pass  c2.zhuzher/pdm;
}
}
server {
listen    8081;
server_name 127.0.0.1;
#charset koi8-r;
#access_log logs/host.access.log main;
location / {
root  html;
index index.html index.htm;
}
#⾃定义本地路径，代理转发请求
location /pdm    {
proxy_pass c2.zhuzher/pdm;
charset utf-8;
#  proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
}
项⽬⾥⾯直接调⽤配置的8081端⼝就可以了:
<('//localhost:8081/pdm/user/login',data)
注意这⾥还有⼀点需要注意，如果Content-Type是 application/json的话是⽆法发送跨域请求的，这⾥提供⼀种解决办法，就是接⼝前端请求type改成'Content-Type':'text/plain'
发送数据转成字符串:
JSON.stringify(data)
后端接⼝⽤String接受数据，然后再转成对象就可以了:
@PostMapping("/distributeBatch")
public ResMsg distributeSaleBatch(@RequestBody String params){
System.out.println(params);
//Integer user_id, Integer customer_id
//Gson 字符串转对象
List<Map<String, Integer>> fromJson = new Gson().fromJson(params, new TypeToken<List<Map<String, Integer>>>() {
}.getType());
System.out.println(new Gson().toJson(fromJson));
return registeredCustomerService.distributeSaleBatch(fromJson);
}
以上就是本⽂的全部内容，希望对⼤家的学习有所帮助，也希望⼤家多多⽀持。

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