文章目录
一、@ResponseBody注解
1.导包
2.@ResponseBody返回json数据
@ResponseBody注解标在方法上，方法就返回json数据。
@Autowired
EmployeeDao employeeDao;
/**
* 将返回的数据放在响应体中.
* 如果是对象，自动转换为json格式
*/
@ResponseBody
@RequestMapping("/getallajax")
public Collection<Employee> ajaxGetAll() {
Collection<Employee> all = employeeDao.getAll();
return all;
}
访问项目http://localhost:8080/6.SpringMVC_CRUD/getallajax浏览器显示结果如下：
[{"id":1001,"lastName":"E-AA","email":"[email protected]","gender":1,"department":
{"id":101,"departmentName":"D-AA"},"birth":null},{"id":1002,"lastName":"E-
BB","email":"bb@163.com","gender":1,"department":{"id":102,"departmentName":"D-
BB"},"birth":null},{"id":1003,"lastName":"E-
CC","email":"cc@163.com","gender":0,"department":{"id":103,"departmentName":"D-
CC"},"birth":null},{"id":1004,"lastName":"E-
DD","email":"dd@163.com","gender":0,"department":{"id":104,"departmentName":"D-
DD"},"birth":null},{"id":1005,"lastName":"E-
EE","email":"ee@163.com","gender":1,"department":{"id":105,"departmentName":"D-
EE"},"birth":null}]
3.使用ResponseEntity既能返回响应数据还能定制响应头
@RequestMapping("/haha")
public ResponseEntity<String> haha() {
String body = "<h1>success</h1>";
MultiValueMap<String, String> headers = new HttpHeaders();// 自定义响应头
HttpStatus statusCode;
headers.add("Set-Cookie", "username=hahahaha");
return new ResponseEntity<String>(body, headers, HttpStatus.OK);
}
二、@RequestBody注解
1.@RequestBody获取请求体内容
handler处理器
// @RequestBody获取一个请求的请求体
@RequestMapping("/testRequestBody")
public String testRequestBody(@RequestBody String body) {
System.out.println("请求体：" + body);
return "success";
}
前端页面
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<%
pageContext.setAttribute("ctp",request.getContextPath());
%>
</head>
<body>
<form action="${ctp }/testRequestBody" method="POST" enctype="multipart/form-data">
<input name="username" value="tomcat"/>
<input name="passworld" value="123456"/>
<input type="file" name="file"/>
<input type="submit"/>
</form>
</body>
点击提交成功打印出请求体
打印结果：
请求体：-----------------------------7e43752205b6
Content-Disposition: form-data; name="username"
tomcat
-----------------------------7e43752205b6
Content-Disposition: form-data; name="passworld"
123456
-----------------------------7e43752205b6
Content-Disposition: form-data; name="file"; filename=""
Content-Type: application/octet-stream
-----------------------------7e43752205b6--
2.@RequestBody获取请求数据
前端页面
- 通过ajax发送json请求给服务器。
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<%
pageContext.setAttribute("ctp", request.getContextPath());
%>
</head>
<script type="text/javascript" src="jQuery/jQuery-3.4.1.js"></script>
<body>
<a href="${ctp }/testRequestBody">ajax发送json数据</a> //点击发送ajax请求
</body>
<script type="text/javascript">
$("a:first").click(function() {
var emp = {
lastname : "张三",
email : "[email protected]",
gender : 1
};
var empStr = JSON.stringify(emp);//将js对象转换为json对象
$.ajax({
url : '${ctp}/testRequestBody',
type : "POST",
data : empStr,
contentType : "application/json",
success : function(data) {
alert(data)
}
});
return false;
});
</script>
</html>
处理器
- 使用
@RequestBody注解，可以接收json数据，将请求体中的数据封装为Employee 对象。
// @RequestBody可以获取一个请求的请求体
@RequestMapping("/testRequestBody")
public String testRequestBody(@RequestBody Employee employee) {
System.out.println("请求体：" + employee);
return "success";
}
3.使用HttpEntity获取请求体的同时获取请求头
- 除了使用@RequestBody获取请求体内容，还可以使用HttpEntity来获取请求头和请求体的内容。
@RequestMapping("/test01")
public String test01(HttpEntity<String> str) {
System.out.println(str);
return "success";
}
