本次数据请求使用postman, postman下载地址：https://www.getpostman.com/
一、页面跳转
1. 页面跳转
@Controller
public class IndexController {
@RequestMapping("/")
public String index(){
return "/index";
}
}2. 请求转发
@Controller
public class IndexController {
@RequestMapping("/")
public String index(){
return "/index";
}
@RequestMapping("/login")
public String forward(){
if(true){
return "forward:/index";
}
return "login";
}
}3. 重定向
@Controller
public class IndexController {
@RequestMapping("/")
public String index(){
return "/index";
}
@RequestMapping("/login")
public String redirect(){
if(true){
return "redirect:/index";
}
return "login";
}
}二、接收表单提交参数
1. 接收简单包装类型
模拟用户登录，接收用户名、密码、验证码参数
@PostMapping("/login1")
@ResponseBody
public Map<String, Object> submitLogin1(String username, String password, String captcha) {
Map<String, Object> resultMap = new HashMap<>(16);
resultMap.put("code", 200);
resultMap.put("msg", "登录成功");
resultMap.put("username", username);
resultMap.put("password", password);
resultMap.put("captcha", captcha);
return resultMap;
}
2. 通过request获取请求参数
@PostMapping("/login2")
@ResponseBody
public Map<String, Object> submitLogin2() {
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
String username = request.getParameter("username");
String password = request.getParameter("password");
String captcha = request.getParameter("captcha");
Map<String, Object> resultMap = new HashMap<>(16);
resultMap.put("code", 200);
resultMap.put("msg", "登录成功");
resultMap.put("username", username);
resultMap.put("password", password);
resultMap.put("captcha", captcha);
return resultMap;
}
3. 接收对象类型
@Data
public class LoginUser {
private String username;
private String password;
private String code;
}
@PostMapping("/login3")
@ResponseBody
public Map<String, Object> submitLogin3(LoginUser loginUser) {
Map<String, Object> resultMap = new HashMap<>(16);
resultMap.put("code", 200);
resultMap.put("msg", "登录成功");
resultMap.put("username", loginUser.getUsername());
resultMap.put("password", loginUser.getPassword());
resultMap.put("captcha", loginUser.getCaptcha());
return resultMap;
}
4.接收Map类型
@PostMapping("/login4")
@ResponseBody
public Map<String, Object> submitLogin4(@RequestParam Map<String, Object> loginUser) {
Map<String, Object> resultMap = new HashMap<>(16);
resultMap.put("code", 200);
resultMap.put("msg", "登录成功");
resultMap.put("username", loginUser.get("username"));
resultMap.put("password", loginUser.get("password"));
resultMap.put("captcha", loginUser.get("captcha"));
return resultMap;
}
5.接收数组类型
@PostMapping("/modifyRole1")
@ResponseBody
public Map<String, Object> modifyRole1(Integer userId, Integer[] roleIds) {
Map<String, Object> resultMap = new HashMap<>(16);
resultMap.put("code", 200);
resultMap.put("msg", "修改角色权限成功");
resultMap.put("userId", userId);
resultMap.put("roleIds", Arrays.toString(roleIds));
return resultMap;
}
6.接收List类型
@PostMapping("/modifyRole2")
@ResponseBody
public Map<String, Object> modifyRole2(Integer userId, @RequestParam("roleIds") List<Integer> roleIds) {
Map<String, Object> resultMap = new HashMap<>(16);
resultMap.put("code", 200);
resultMap.put("msg", "修改角色权限成功");
resultMap.put("userId", userId);
resultMap.put("roleIds", roleIds.toString());
return resultMap;
}
7.接收Set类型
@PostMapping("/modifyRole3")
@ResponseBody
public Map<String, Object> modifyRole3(Integer userId, @RequestParam("roleIds") Set<String> roleIds) {
Map<String, Object> resultMap = new HashMap<>(16);
resultMap.put("code", 200);
resultMap.put("msg", "修改角色权限成功");
resultMap.put("userId", userId);
resultMap.put("roleIds", roleIds.toString());
return resultMap;
}
8.接收带List参数的实体类
@Data
public class ModifyRole {
private Integer userId;
private List<String> roleIds;
}
@PostMapping("/modifyRole4")
@ResponseBody
public Map<String, Object> modifyRole4(ModifyRole modifyRole) {
Map<String, Object> resultMap = new HashMap<>(16);
resultMap.put("code", 200);
resultMap.put("msg", "修改角色权限成功");
resultMap.put("modifyRole", modifyRole.toString());
return resultMap;
}
三、接收JSON参数
1. 接收带List参数的实体类
@Data
public class ModifyRole {
private Integer userId;
private List<String> roleIds;
}
@PostMapping("/modifyRole5")
@ResponseBody
public Map<String, Object> modifyRole5(@RequestBody ModifyRole modifyRole) {
Map<String, Object> resultMap = new HashMap<>(16);
resultMap.put("code", 200);
resultMap.put("msg", "修改角色权限成功");
resultMap.put("modifyRole", modifyRole.toString());
return resultMap;
}
2.接收List<Bean>类型
@Data
public class SysUser {
private String username;
private String password;
}
@PostMapping("/batchInsert")
@ResponseBody
public Map<String, Object> batchInsert(@RequestBody List<SysUser> sysUserList) {
Map<String, Object> resultMap = new HashMap<>(16);
resultMap.put("code", 200);
resultMap.put("msg", "批量新增用户成功");
resultMap.put("modifyRoleList", sysUserList.toString());
return resultMap;
}
3.接收Set<Bean>类型
@PostMapping("/batchInsert2")
@ResponseBody
public Map<String, Object> batchInsert2(@RequestBody Set<SysUser> sysUserSet) {
Map<String, Object> resultMap = new HashMap<>(16);
resultMap.put("code", 200);
resultMap.put("msg", "批量新增用户成功");
resultMap.put("modifyRoleSet", sysUserSet.toString());
return resultMap;
}
四、文件上传、下载
1. 文件上传
新建一个文件
@PostMapping("/upload")
@ResponseBody
public void upload(MultipartFile multipartFile) throws IOException {
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
// 获取文件流
InputStream inputStream = multipartFile.getInputStream();
try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, UTF_8.name()))){
// 读取文件数据
String collect = reader.lines().collect(Collectors.joining());
// 直接返回文件数据给前端
attributes.getResponse().getWriter().write(collect);
} catch (Exception e){
e.printStackTrace();
}
}
2. 文件下载
@GetMapping("/download")
public ResponseEntity<byte[]> download() throws IOException {
File file = ResourceUtils.getFile("classpath:application.yml");
byte[] body;
try (InputStream is = new FileInputStream(file)){
body = new byte[is.available()];
is.read(body);
}
HttpHeaders headers = new HttpHeaders();
headers.add("Content-Disposition", "attchement;filename=" + file.getName());
return new ResponseEntity<>(body, headers, HttpStatus.OK);
}
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