Spring MVC Rest API、跨域请求
Rest API
package net.wuxianjie.demo.controller;
import java.util.Date;
import net.wuxianjie.demo.dto.UserDto;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/users")
public class UserController {
@GetMapping(value = "{id:\\d+}")
public UserDto getUser(@PathVariable("id") Integer userId) {
return new UserDto(userId, new Date(), "假名" + userId);
}
}GET http://localhost:8000/users/102 Accept: application/json
跨域请求
index.html ：
<!DOCTYPE html>
<html>
<head lang="zh">
<meta charset="UTF-8">
<title>Test Index</title>
</head>
<body>
<script type="text/javascript">
fetch("http://localhost:8000/users/102").then(response => {
response.json().then(data => console.log(data));
});
</script>
</body>
</html>方法一（手动）：
package net.wuxianjie.demo.controller;
import java.util.Date;
import javax.servlet.http.HttpServletResponse;
import net.wuxianjie.demo.dto.UserDto;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/users")
public class UserController {
@GetMapping(value = "{id:\\d+}")
public UserDto getUser(@PathVariable("id") Integer userId, HttpServletResponse response) {
response.setHeader("Access-Control-Allow-Origin", "*");
return new UserDto(userId, new Date(), "假名" + userId);
}
}方法二（注解）：
package net.wuxianjie.demo.controller;
import java.util.Date;
import net.wuxianjie.demo.dto.UserDto;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/users")
public class UserController {
@CrossOrigin
@GetMapping(value = "{id:\\d+}")
public UserDto getUser(@PathVariable("id") Integer userId) {
return new UserDto(userId, new Date(), "假名" + userId);
}
}方法三（全局配置）：
app-context.xml ：
<mvc:cors> <mvc:mapping path="/users/**"/> </mvc:cors>
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