跨域问题解决方案
跨域问题解决方案
五种网站跨域解决方案
使用jsonp解决网站跨域 只能支持get 不支持post
2.使用HttpClient内部转发 效率低 发送两次请求
3.使用设置响应头允许跨域
4.基于Nginx搭建企业级API接口网关 保证域名和端口一直 以项目区分反向代理到真实服务器地址
5.使用Zuul搭建微服务API接口网关
使用设置响应头允许跨域:
在B项目中添加:
response.setHeader(“Access-Control-Allow-Origin”, “*“);
package com.toov5.controller;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletResponse;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@SpringBootApplication
public class BIndexController {
@RequestMapping("/getBInfo")
public Map<String, Object> getBInfo(HttpServletResponse response){
//告诉浏览器 允许跨域 这段代码应该放在过滤器里面的
response.setHeader("Access-Control-Allow-Origin", "*"); //*代表所有 可以a.toov5.com专门的
//提供给Ajax嗲用
Map<String,Object> result = new HashMap<String, Object>();
result.put("code", 200);
result.put("msg", "登录成功");
return result;
}
public static void main(String[] args) {
SpringApplication.run(BIndexController.class, args);
}
}
JSONP解决方案:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript"
src="http://code.jquery.com/jquery-1.8.0.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$.ajax({
type : "POST",
async : false,
url : "http://b.toov5.com:8081/getBInfo",
dataType : "jsonp",
jsonp : "jsonpCallback",//服务端用于接收callback调用的function名的参数
success : function(data) {
alert(data["code"]); //获取到code
},
error : function() {
alert('fail');
}
});
});
</script>
</head>
<body>我是A项目 正在调用B项目
</body>
</html>
首先该成JSONP的 形式
dataType : "jsonp",
jsonp : "jsonpCallback",//服务端用于接收callback调用的function名的参数
访问: (生成的随机数)
注意 不支持post请求!
HttpClient方案转发:
相当于发送两次请求
隐藏了真实地址 Nginx反向代理类似
同时需要@ResponseBody哦 因为返回json格式
修改前段访问的接口 保持一致:
$(document).ready(function() {
$.ajax({
type : "POST",
async : false,
url : "http://a.toov5.com:8080/forwardB",
dataType : "json",
success : function(data) {
alert(data["code"]); //获取到code
},
error : function() {
alert('fail');
}
});
});
url : "http://a.toov5.com:8080/forwardB",
dataType : "json",
success : function(data) {
alert(data["code"]); //获取到code
},
error : function() {
alert('fail');
}
});
});
HttpClient:
package com.toov5.controller;
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpStatus;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.alibaba.fastjson.JSONObject;
public class HttpClientUtils {
private static Logger logger = LoggerFactory.getLogger(HttpClientUtils.class); // 日志记录
private static RequestConfig requestConfig = null;
static {
// 设置请求和传输超时时间
requestConfig = RequestConfig.custom().setSocketTimeout(2000).setConnectTimeout(2000).build();
}
/**
* post请求传输json参数
*
* @param url
* url地址
* @param json
* 参数
* @return
*/
public static JSONObject httpPost(String url, JSONObject jsonParam) {
// post请求返回结果
CloseableHttpClient httpClient = HttpClients.createDefault();
JSONObject jsonResult = null;
HttpPost httpPost = new HttpPost(url);
// 设置请求和传输超时时间
httpPost.setConfig(requestConfig);
try {
if (null != jsonParam) {
// 解决中文乱码问题
StringEntity entity = new StringEntity(jsonParam.toString(), "utf-8");
entity.setContentEncoding("UTF-8");
entity.setContentType("application/json");
httpPost.setEntity(entity);
}
CloseableHttpResponse result = httpClient.execute(httpPost);
// 请求发送成功,并得到响应
if (result.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
String str = "";
try {
// 读取服务器返回过来的json字符串数据
str = EntityUtils.toString(result.getEntity(), "utf-8");
// 把json字符串转换成json对象
jsonResult = JSONObject.parseObject(str);
} catch (Exception e) {
logger.error("post请求提交失败:" + url, e);
}
}
} catch (IOException e) {
logger.error("post请求提交失败:" + url, e);
} finally {
httpPost.releaseConnection();
}
return jsonResult;
}
/**
* post请求传输String参数 例如:name=Jack&sex=1&type=2
* Content-type:application/x-www-form-urlencoded
*
* @param url
* url地址
* @param strParam
* 参数
* @return
*/
public static JSONObject httpPost(String url, String strParam) {
// post请求返回结果
CloseableHttpClient httpClient = HttpClients.createDefault();
JSONObject jsonResult = null;
HttpPost httpPost = new HttpPost(url);
httpPost.setConfig(requestConfig);
try {
if (null != strParam) {
// 解决中文乱码问题
StringEntity entity = new StringEntity(strParam, "utf-8");
entity.setContentEncoding("UTF-8");
entity.setContentType("application/x-www-form-urlencoded");
httpPost.setEntity(entity);
}
CloseableHttpResponse result = httpClient.execute(httpPost);
// 请求发送成功,并得到响应
if (result.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
String str = "";
try {
// 读取服务器返回过来的json字符串数据
str = EntityUtils.toString(result.getEntity(), "utf-8");
// 把json字符串转换成json对象
jsonResult = JSONObject.parseObject(str);
} catch (Exception e) {
logger.error("post请求提交失败:" + url, e);
}
}
} catch (IOException e) {
logger.error("post请求提交失败:" + url, e);
} finally {
httpPost.releaseConnection();
}
return jsonResult;
}
/**
* 发送get请求
*
* @param url
* 路径
* @return
*/
public static JSONObject httpGet(String url) {
// get请求返回结果
JSONObject jsonResult = null;
CloseableHttpClient client = HttpClients.createDefault();
// 发送get请求
HttpGet request = new HttpGet(url);
request.setConfig(requestConfig);
try {
CloseableHttpResponse response = client.execute(request);
// 请求发送成功,并得到响应
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
// 读取服务器返回过来的json字符串数据
HttpEntity entity = response.getEntity();
String strResult = EntityUtils.toString(entity, "utf-8");
// 把json字符串转换成json对象
jsonResult = JSONObject.parseObject(strResult);
} else {
logger.error("get请求提交失败:" + url);
}
} catch (IOException e) {
logger.error("get请求提交失败:" + url, e);
} finally {
request.releaseConnection();
}
return jsonResult;
}
}
Controller:
package com.toov5.controller;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.alibaba.fastjson.JSONObject;
@Controller
@SpringBootApplication
public class AIndexController {
@RequestMapping("/aIndexJsp")
public String AIndexJsp() {
return "aIndex";
}
//使用httpClient进行访问b接口
@RequestMapping("/forwardB")
@ResponseBody //这里一定要为 json形式!!! jsp中的ajax访问的路径
public JSONObject forwardB() {
JSONObject result = HttpClientUtils.httpGet("http://b.toov5.com:8081/getBInfo");
return result;
}
public static void main(String[] args) {
SpringApplication.run(AIndexController.class, args);
}
}
B的controller:
package com.toov5.controller;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletResponse;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@SpringBootApplication
public class BIndexController {
@RequestMapping("/getBInfo")
public Map<String, Object> getBInfo(HttpServletResponse response){
//告诉浏览器 允许跨域 这段代码应该放在过滤器里面的
// response.setHeader("Access-Control-Allow-Origin", "*"); //*代表所有 可以a.toov5.com专门的
//提供给Ajax嗲用
Map<String,Object> result = new HashMap<String, Object>();
result.put("code", 200);
result.put("msg", "登录成功");
return result;
}
public static void main(String[] args) {
SpringApplication.run(BIndexController.class, args);
}
}
Nginx 方案:
api.toov5.com/a
api.toov5.com/b
通过Nginx 转发到不同的 项目
Zuul方案:
类似Nginx 修改Zuul的配置yml
不管访问A项目还是B项目 首先保证域名端口号统一
请求先到Nginx 判断域名相同 项目名字不同 转发到某个项目
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