SpringBoot WEB Development Integration - (f) CROS support

Summary:

　　CROS (Cross-Origin Resource Sharing) is a cross-domain resource sharing technical standards developed by the W3C, the purpose of the front end in order to solve cross-domain requests, in JavaEE development, the most common solution for front-end cross-domain requests are JSONP, but JSONP support only Get request, but CROS supports multiple HTTP request methods.

　　If the server supports the CROS, the server has a response header Access-Control-Allow-Origin field, the value of this field is used to record the domain change access resources, when the browser receives such response header information extracted Access-Control- allow-Origin value field and found to contain fields where the current page, you know that this is allowed cross-domain, not their limitations.

1. Local Configuration:

　Controller: a add a delete interfaces

@RestController
@RequestMapping("/book")
public class BookController {

    @PostMapping("/a")
    @CrossOrigin(value = "http://localhost:8081"
            ,maxAge = 1800,allowedHeaders = "*")
    public String addBook(String name) {
        return "receive:" + name;
    }

    @DeleteMapping("/{id}")
    @CrossOrigin(value = "http://localhost:8081"
            ,maxAge = 1800,allowedHeaders = "*")
    public String deleteBookById(@PathVariable Long id) {
        return String.valueOf(id);
    }

}

@CrossOrigin(value = "http://localhost:8081"
            , maxAge = 1800, allowedHeaders = " *") 
which support the value field that indicates from http: // localhost: 8081 requesting field is supported across domains, 
the maxAge indicates validity probe request (sending DELETE, PUT request or self-defined request header information in execution, first sends a probe request and send the request, the probe request has validity is the maxAge), 1800 seconds by default 
allowedHeaders representation allows request header, * denotes allow

2. Global Configuration :

　　Need to write a class that implements the interface WebMvcConfigurer rewrite addCrosMappings methods, methods

　　addMapping request indicates which format processing of cross-domain

　　allowedHeaders representation allows request header, the default *

　　allowedMethods representation allows the request method, the default GET POST HEAD

　　maxAge probe request is valid

　 allowedOrigins expressed support for a domain

@Configuration
public class MyWebMvcConfig implements WebMvcConfigurer {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/book/**")
                .allowedHeaders("*")
                .allowedMethods("*")
                .maxAge(1800)
                .allowedOrigins("http://localhost:8081");
    }
}

test:

Two projects start port number 8080,8081

In the index.html Ajax requests 8081 to 8080

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="jquery3.3.1.js"></script>
</head>
<body>
<div id="contentDiv"></div>
<div id="deleteResult"></div>
<input type="button" value="提交数据" onclick="postData()"><br>
<input type="button" value="删除数据" onclick="deleteData()"><br>
<input type="button" value="获取数据" onclick="getData()"><br>
<script>function deleteData() {
        $.ajax({
            url:'http://localhost:8080/book/99',
            type:'delete',
            success:function (msg) {
                $("#deleteResult").html(msg);
            }
        })
    }
    function postData() {
        $.ajax({
            url:'http://localhost:8080/book/a',
            type:'post',
            Data: {name: ' Three Kingdoms ' },
            success:function (msg) {
                $("#contentDiv").html(msg);
            }
        })
    }
</script>
</body>
</html>

8080 in the controller:

@RestController
@RequestMapping("/book")
public class BookController {

    @PostMapping("/a")
    @CrossOrigin(value = "http://localhost:8081"
            ,maxAge = 1800,allowedHeaders = "*")
    public String addBook(String name) {
        return "receive:" + name;
    }

    @DeleteMapping("/{id}")
    @CrossOrigin(value = "http://localhost:8081"
            ,maxAge = 1800,allowedHeaders = "*")
    public String deleteBookById(@PathVariable Long id) {
        return String.valueOf(id);
    }

}

May request the data, the completion of the cross-domain

SpringBoot WEB Development Integration - (f) CROS support

Guess you like