3六、SpringBoot配置Cors解決跨域請求

CORS(Cross-Origin Resource Sharing)"跨域資源共享",是一個W3C標準,它容許瀏覽器向跨域服務器發送Ajax請求,打破了Ajax只能訪問本站內的資源限制,CORS在不少地方都有被使用,微信支付的JS支付就是經過JS向微信服務器發送跨域請求。開放Ajax訪問可被跨域訪問的服務器大大減小了後臺開發的工做,先後臺工做也能夠獲得很好的明確以及分工,下面咱們就看講一下如何讓SpringBoot項目支持CORS跨域。javascript

一、新建項目sc-cors,對應的pom.xml文件以下html

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>spring-cloud</groupId>
    <artifactId>sc-cors</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>sc-cors</name>
    <url>http://maven.apache.org</url>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
    </parent>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

        </dependencies>
    </dependencyManagement>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
</project>

二、新建配置類,配置知足什麼的條件的能夠跨域訪問java

package sc.cors.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class CorsConfig implements WebMvcConfigurer{

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/cors/**")
        .allowedMethods("*")
        .allowedOrigins("*")
        .allowedHeaders("*");
    }
}

三、新建controller,包含一個能夠跨域訪問的資源,一個不能夠跨域訪問的資源jquery

package sc.cors.controller;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import sc.cors.model.User;

@RestController
public class CorsController {

    @RequestMapping("/cors/getUserInfo")
    public Map<String, Object> getUserInfo() {
        Map<String, Object> resp = new HashMap<String, Object>();
        resp.put("code", "success");
        resp.put("message", "success");
        User user = new User();
        user.setId(1);
        user.setPosition("cto");
        user.setUserName("huang jinjin");
        resp.put("body", user);
        return resp;
    }

    @RequestMapping("/nocors/listUserInfo")
    public Map<String, Object> listUserInfo() {
        Map<String, Object> resp = new HashMap<String, Object>();
        resp.put("code", "success");
        resp.put("message", "success");
        List<User> list = new ArrayList<User>();
        User user = new User();
        user.setId(1);
        user.setPosition("cto");
        user.setUserName("huang jinjin");
        list.add(user);
        resp.put("body", list);
        return resp;
    }

}

四、其餘項目文件以下圖
image.pngweb

五、在新建一個項目sc-cors-web,該項目比較簡單,包含一個比較重要的html文件ajax

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>cors</title>
<script type="text/javascript" src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<script type="text/javascript">
    $(function(){
            $("#getUserInfo").click(function(){
                $.ajax({
                    url: "http://127.0.0.1:9088/cors/getUserInfo",
                    success: function(data){
                        console.log(data)
                        alert("getUserInfo");
                    }
                })
            });
    });

    $(function(){
        $("#listUserInfo").click(function(){
            $.ajax({
                url: "http://127.0.0.1:9088/nocors/listUserInfo",
                success: function(data){
                    console.log(data)
                    alert("listUserInfo");
                }
            })
        });
});

</script>
</head>
<body>
    <input type="button" id="getUserInfo" value="CORS跨域請求getUserInfo"/><br><br/>
    <input type="button" id="listUserInfo" value="CORS跨域請求listUserInfo"/>
</body>
</html>

備註:spring

sc-cors項目對應的端口爲9088  
  sc-cors-web項目對應的端口爲9087

六、分別啓動項目sc-cors和sc-cors-web
七、驗證跨域請求
訪問http://127.0.0.1:9087/index.html
image.png
點擊CORS跨域請求getUserInfo
image.png
點擊CORS跨域請求listUserInfo
image.pngapache

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