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
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@Controller
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public
class IndexController {
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/**
-
* 进入首页
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*
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* @return 首页页面
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*/
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@RequestMapping("/")
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public String index(){
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return
"/index";
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}
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}
2. 请求转发
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@Controller
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public
class IndexController {
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/**
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* 进入首页
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*
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* @return 首页页面
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*/
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@RequestMapping("/")
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public String index(){
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return
"/index";
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}
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/**
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* 访问登录页面时，如果已经登录就转发到首页,未登录就进入登录页面
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*
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* @return 登录页面
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*/
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@RequestMapping("/login")
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public String forward(){
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if(
true){
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return
"forward:/index";
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}
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return
"login";
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}
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}
3. 重定向
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@Controller
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public
class IndexController {
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/**
-
* 进入首页
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*
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* @return 首页页面
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*/
-
@RequestMapping("/")
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public String index(){
-
return
"/index";
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}
-
-
/**
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* 访问登录页面时，如果已经登录就重定向到首页,未登录就进入登录页面
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*
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* @return 登录页面
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*/
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@RequestMapping("/login")
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public String redirect(){
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if(
true){
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return
"redirect:/index";
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}
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return
"login";
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}
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}
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
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/**
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* 提交登陆信息
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*
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* @param username 用户名
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* @param password 密码
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* @param captcha 验证码
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* @return 结果
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*/
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@PostMapping("/login1")
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@ResponseBody
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public Map<String, Object> submitLogin1(String username, String password, String captcha) {
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Map<String, Object> resultMap =
new HashMap<>(
16);
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resultMap.put(
"code",
200);
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resultMap.put(
"msg",
"登录成功");
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resultMap.put(
"username", username);
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resultMap.put(
"password", password);
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resultMap.put(
"captcha", captcha);
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return resultMap;
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}
2. 通过request获取请求参数
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/**
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* 提交登陆信息
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*
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* @return 结果
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*/
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@PostMapping("/login2")
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@ResponseBody
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public Map<String, Object> submitLogin2() {
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ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
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HttpServletRequest request = attributes.getRequest();
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String username = request.getParameter(
"username");
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String password = request.getParameter(
"password");
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String captcha = request.getParameter(
"captcha");
-
-
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Map<String, Object> resultMap =
new HashMap<>(
16);
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resultMap.put(
"code",
200);
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resultMap.put(
"msg",
"登录成功");
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resultMap.put(
"username", username);
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resultMap.put(
"password", password);
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resultMap.put(
"captcha", captcha);
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return resultMap;
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}
3. 接收对象类型
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@Data
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public
class LoginUser {
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private String username;
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private String password;
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private String code;
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}
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/**
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* 提交登陆信息
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*
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* @return 结果
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*/
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@PostMapping("/login3")
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@ResponseBody
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public Map<String, Object> submitLogin3(LoginUser loginUser) {
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Map<String, Object> resultMap =
new HashMap<>(
16);
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resultMap.put(
"code",
200);
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resultMap.put(
"msg",
"登录成功");
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resultMap.put(
"username", loginUser.getUsername());
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resultMap.put(
"password", loginUser.getPassword());
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resultMap.put(
"captcha", loginUser.getCaptcha());
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return resultMap;
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}
4.接收Map类型
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/**
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* 提交登陆信息
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*
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* @return 结果
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*/
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@PostMapping("/login4")
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@ResponseBody
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public Map<String, Object> submitLogin4(@RequestParam Map<String, Object> loginUser) {
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Map<String, Object> resultMap =
new HashMap<>(
16);
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resultMap.put(
"code",
200);
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resultMap.put(
"msg",
"登录成功");
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resultMap.put(
"username", loginUser.get(
"username"));
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resultMap.put(
"password", loginUser.get(
"password"));
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resultMap.put(
"captcha", loginUser.get(
"captcha"));
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return resultMap;
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}
5.接收数组类型
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/**
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* 修改角色权限
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*
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* @param userId 用户id
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* @param roleIds 角色id
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* @return 结果
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*/
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@PostMapping("/modifyRole1")
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@ResponseBody
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public Map<String, Object> modifyRole1(Integer userId, Integer[] roleIds) {
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Map<String, Object> resultMap =
new HashMap<>(
16);
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resultMap.put(
"code",
200);
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resultMap.put(
"msg",
"修改角色权限成功");
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resultMap.put(
"userId", userId);
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resultMap.put(
"roleIds", Arrays.toString(roleIds));
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return resultMap;
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}
6.接收List类型
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/**
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* 修改角色权限
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*
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* @param userId 用户id
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* @param roleIds 角色id
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* @return 结果
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*/
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@PostMapping("/modifyRole2")
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@ResponseBody
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public Map<String, Object> modifyRole2(Integer userId, @RequestParam("roleIds") List<Integer> roleIds) {
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Map<String, Object> resultMap =
new HashMap<>(
16);
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resultMap.put(
"code",
200);
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resultMap.put(
"msg",
"修改角色权限成功");
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resultMap.put(
"userId", userId);
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resultMap.put(
"roleIds", roleIds.toString());
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return resultMap;
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}
7.接收Set类型
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/**
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* 修改角色权限
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*
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* @param userId 用户id
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* @param roleIds 角色id
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* @return 结果
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*/
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@PostMapping("/modifyRole3")
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@ResponseBody
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public Map<String, Object> modifyRole3(Integer userId, @RequestParam("roleIds") Set<String> roleIds) {
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Map<String, Object> resultMap =
new HashMap<>(
16);
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resultMap.put(
"code",
200);
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resultMap.put(
"msg",
"修改角色权限成功");
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resultMap.put(
"userId", userId);
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resultMap.put(
"roleIds", roleIds.toString());
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return resultMap;
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}
8.接收带List参数的实体类
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@Data
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public
class ModifyRole {
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private Integer userId;
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private List<String> roleIds;
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}
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/**
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* 修改角色权限
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*
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* @param modifyRole 数据
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* @return 结果
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*/
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@PostMapping("/modifyRole4")
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@ResponseBody
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public Map<String, Object> modifyRole4(ModifyRole modifyRole) {
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Map<String, Object> resultMap =
new HashMap<>(
16);
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resultMap.put(
"code",
200);
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resultMap.put(
"msg",
"修改角色权限成功");
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resultMap.put(
"modifyRole", modifyRole.toString());
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return resultMap;
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}
三、接收JSON参数
1. 接收带List参数的实体类
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@Data
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public
class ModifyRole {
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private Integer userId;
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private List<String> roleIds;
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}
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/**
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* 修改角色权限
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*
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* @param modifyRole 数据
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* @return 结果
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*/
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@PostMapping("/modifyRole5")
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@ResponseBody
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public Map<String, Object> modifyRole5(@RequestBody ModifyRole modifyRole) {
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Map<String, Object> resultMap =
new HashMap<>(
16);
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resultMap.put(
"code",
200);
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resultMap.put(
"msg",
"修改角色权限成功");
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resultMap.put(
"modifyRole", modifyRole.toString());
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return resultMap;
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}
2.接收List<Bean>类型
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@Data
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public
class SysUser {
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private
String username;
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private
String password;
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}
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/**
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* 批量新增用户
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*
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* @param sysUserList 数据集合
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* @return 结果
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*/
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@PostMapping("/batchInsert")
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@ResponseBody
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public Map<String, Object> batchInsert(@RequestBody List<SysUser> sysUserList) {
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Map<String, Object> resultMap =
new HashMap<>(
16);
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resultMap.put(
"code",
200);
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resultMap.put(
"msg",
"批量新增用户成功");
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resultMap.put(
"modifyRoleList", sysUserList.toString());
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return resultMap;
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}
3.接收Set<Bean>类型
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/**
-
* 批量新增用户
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*
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* @param sysUserSet 数据集合
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* @return 结果
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*/
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@PostMapping("/batchInsert2")
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@ResponseBody
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public Map<String, Object> batchInsert2(@RequestBody Set<SysUser> sysUserSet) {
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Map<String, Object> resultMap =
new HashMap<>(
16);
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resultMap.put(
"code",
200);
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resultMap.put(
"msg",
"批量新增用户成功");
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resultMap.put(
"modifyRoleSet", sysUserSet.toString());
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return resultMap;
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}
四、文件上传、下载
1. 文件上传
新建一个文件
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/**
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* 上传文件
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*
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* @param multipartFile 上传的文件
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* @return 结果
-
*/
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@PostMapping("/upload")
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@ResponseBody
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public void upload(MultipartFile multipartFile) throws IOException {
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ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
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// 获取文件流
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InputStream inputStream = multipartFile.getInputStream();
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try (BufferedReader reader =
new BufferedReader(
new InputStreamReader(inputStream, UTF_8.name()))){
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// 读取文件数据
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String collect = reader.lines().collect(Collectors.joining());
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// 直接返回文件数据给前端
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attributes.getResponse().getWriter().write(collect);
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}
catch (Exception e){
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e.printStackTrace();
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}
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}
2. 文件下载
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/**
-
* 文件下载
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*/
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@GetMapping("/download")
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public ResponseEntity<
byte[]> download()
throws IOException {
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File file = ResourceUtils.getFile(
"classpath:application.yml");
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byte[] body;
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try (InputStream is =
new FileInputStream(file)){
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body =
new
byte[is.available()];
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is.read(body);
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}
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HttpHeaders headers =
new HttpHeaders();
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headers.add(
"Content-Disposition",
"attchement;filename=" + file.getName());
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return
new ResponseEntity<>(body, headers, HttpStatus.OK);
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}
转载：https://blog.csdn.net/han12398766/article/details/117389740
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