react 跨域访问后台，默认是有跨域问题，并且火弧和谷歌浏览器，对跨域问题展示还不一样.
谷歌浏览器如下图：
此处状态是200，然而在response却没有任何信息，如下图
然而火弧浏览器，对该问题的描述，就清淅得多，
火弧浏览器告诉我们，跨域了，关于react跨域的帖子，网上也有相关帖子，搜索到的方法，大约都是如下解决方式：
如果你是通过creat-react-app构建的项目，请在package.json文件中的根目录下，添加"proxy": "http://api.xxxx.com"，如果你的项目，需要调用多个不同ip的接口，请使用如下配置：
我要评论"proxy": {
"/api/roomapi": {
"target": "http://open.douyucdn.cn",
"changeorigin":true
},
"/api/v1":{
"target":"http://capi.douyucdn.cn",
"changeorigin":true
}
}
对于antd-pro的项目，需要在package.json的同等目录下添加.roadhogrc文件，具体代码如下:
{
"entry": "src/index.js",
"extrababelplugins": [
"transform-runtime",
"transform-decorators-legacy",
"transform-class-properties",
["import", { "libraryname": "antd", "librarydirectory": "es", "style": true }]
],
"env": {
"development": {
"extrababelplugins": [
"dva-hmr"
]
}
},
"externals": {
"g2": "g2",
"g-cloud": "cloud",
"g2-plugin-slider": "g2.plugin.slider"
},
"ignoremomentlocale": true,
"theme": "./src/theme.js",
"proxy": {
"/api": {
"target": "http://api.xxxx.com/",
"changeorigin": true
}
}
}
配置完成后，再次访问接口，还是出现一样的跨域问题，既然recat的配置，未解决跨域问题，我就把思路转到spring，在spring去处理跨域，在后端程序添加一个拦截器,
package com.gg.interceptor;
import java.util.arraylist;
import java.util.list;
import java.util.vector;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import org.springframework.web.servlet.handlerinterceptor;
import org.springframework.web.servlet.modelandview;
public class processinterceptor implements handlerinterceptor{
@override
public boolean prehandle(httpservletrequest httpservletrequest, httpservletresponse httpservletresponse, object handler)
throws exception {
// todo auto-generated method stub
// 指定白名单域名 http://localhost:8000,http://localhost:8000
list<string> whilelist = new vector<string>();
whilelist.add("http://127.0.0.1:8000");
whilelist.add("http://localhost:8000");
string clientip = httpservletrequest.getheader("origin");
boolean status = false;
for(string ip : whilelist) {
if(clientip!=null&&clientip.equals(ip)) {
status = true;
break;
}
}
/**
* 网上解决方案是httpservletresponse.setheader("access-control-allow-origin","*");设置后发现，还是不能处理跨域问题，需要指定某一个ip，如：http://127.0.0.1:8000
* */
httpservletresponse.setheader("access-control-allow-origin",status?clientip:null);
//响应头设置
httpservletresponse.setheader("access-control-allow-headers", "content-type,content-length, authorization, accept,x-requested-with");
//响应类型
httpservletresponse.setheader("access-control-allow-methods","put,post,get,delete,options");
httpservletresponse.setheader("x-powered-by","jetty");
httpservletresponse.setheader("access-control-allow-credentials","true");
string method= httpservletrequest.getmethod();
if (method.equals("options")){
httpservletresponse.setstatus(200);
return false;
}
system.out.println(method+",status:"+status+",clientip:"+clientip);
return true;
}
@override
public void posthandle(httpservletrequest request, httpservletresponse response, object handler,
modelandview modelandview) throws exception {
// todo auto-generated method stub
}
@override
public void aftercompletion(httpservletrequest request, httpservletresponse response, object handler, exception ex)
throws exception {
// todo auto-generated method stub
}
}
spring-servlet.xml配置如下：
<mvc:interceptors>
<bean class="com.gg.interceptor.processinterceptor"></bean>
</mvc:interceptors>
react客户端代码如下：
model层js代码:
*login({ payload }, { call, put }){
let formdata = new formdata();
formdata.append("loginid",payload.loginid);//账号
formdata.append("password",payload.password);//密码
const response = yield call(requestguanggao, formdata);
yield put({
type: 'changeloginstatus',
payload: response,
});
},
api层js代码:
export async function requestguanggao(formdata){
// let formdata = new formdata();
// formdata.append("loginid",params.loginid);
// formdata.append("password",params.password);
console.log("requestgua >url :" );
return request('http://127.0.0.1:8080/guanggao/usercontroller/login.do', {
method: 'post',
mode: 'cors',
body:formdata,
});
}
通过以下设置，react跨域问题就处理好了。
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