SpringBoot 第一章服务端表单数据校验 （SpringBoot 高级）

xml version="1.0" encoding="UTF-8"?>
project xmlns="http://maven.apache.org/POM/4.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  modelVersion>4.0.0modelVersion>
  parent>
    groupId>org.springframework.bootgroupId>
    artifactId>spring-boot-starter-parentartifactId>
    version>2.4.4version>
    relativePath/> 
  parent>
  groupId>com.AlangroupId>
  artifactId>validateartifactId>
  version>0.0.1-SNAPSHOTversion>
  name>validatename>
  description>SpirngbootValidatedescription>
  properties>
    java.version>1.8java.version>
  properties>
  dependencies>
    dependency>
      groupId>org.springframework.bootgroupId>
      artifactId>spring-boot-starter-thymeleafartifactId>
    dependency>
    dependency>
      groupId>org.springframework.bootgroupId>
      artifactId>spring-boot-starter-webartifactId>
    dependency>
    
    dependency>
      groupId>org.springframework.bootgroupId>
      artifactId>spring-boot-starter-validationartifactId>
    dependency>
   
    dependency>
      groupId>org.springframework.bootgroupId>
      artifactId>spring-boot-starter-testartifactId>
      scope>testscope>
    dependency>
  dependencies>

  build>
    plugins>
      plugin>
        groupId>org.springframework.bootgroupId>
        artifactId>spring-boot-maven-pluginartifactId>
      plugin>
    plugins>
  build>

project>

public class Users {
private String name;
private String password;
private Integer age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {return password;
}
public void setPassword(String password) {
this.password = password;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() {
return "Users [name=" + name + ", password=" + password + ", age="
+ age + "]";
}
}

/**
* SpringBoot 表单数据校验
*
*
*/
@Controller
public class UsersController {
@RequestMapping("/addUser")
public String showPage(){
return "add";
}
/**
* 完成用户添加
*/
@RequestMapping("/save")
public String saveUser(Users users){
System.out.println(users);
return "ok";
}}

DOCTYPE html>
html>
head>
meta charset="UTF-8">
title>添加用户title>
head>
body>
form th:action="@{/save}" method="post">
用户姓名：input type="text" name="name"/>br/>
用户密码：input type="password" name="password" />br/>
用户年龄：input type="text" name="age" />br/>
input type="submit" value="OK"/>
form>
body>
html>

DOCTYPE html>
html>
head>
meta charset="UTF-8">
title>操作成功title>
head>
body>
OK。。。。
body>
html>

public class Users {
@NotBlank //非空校验
private String name;
@NotBlank //密码非空校验
private String password;
private Integer age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() {
return "Users [name=" + name + ", password=" + password + ", age="
+ age + "]";
}
}

/**
* 完成用户添加
*@Valid 开启对 Users 对象的数据校验
*BindingResult:封装了校验的结果
*/
@RequestMapping("/save")
public String saveUser(@Valid Users users,BindingResult result){
if(result.hasErrors()){
return "add";
}
System.out.println(users);
return "ok";
}

DOCTYPE html>
html>
head>
meta charset="UTF-8">
title>添加用户title>
head>
body>
form th:action="@{/save}" method="post">
用户姓名：input type="text" name="name"/>font color="red"
th:errors="${users.name}">font>br/>
用户密码：input type="password" name="password" />font
color="red" th:errors="${users.password}">font>br/>
用户年龄：input type="text" name="age" />font color="red"
th:errors="${users.age}">font>br/>
input type="submit" value="OK"/>
form>
body>
html>

/**
* 解决异常的方式。可以在跳转页面的方法中注入一个 Uesrs 对象。
* 注意：由于 springmvc 会将该对象放入到 Model 中传递。key 的名称会使用
该对象的驼峰式的命名规则来作为 key。
* 参数的变量名需要与对象的名称相同。将首字母小写。
*
* @param users
* @return
*/
@RequestMapping("/addUser")
public String showPage( Users users){
return "add";
}

/**
* 完成用户添加
*@Valid 开启对 Users 对象的数据校验
*BindingResult:封装了校验的结果
*/
@RequestMapping("/save")
public String saveUser( @Valid Users users,BindingResult result){
if(result.hasErrors()){
return "add";
}
System.out.println(users);
return "ok";
}

DOCTYPE html>
html>
head>
meta charset="UTF-8">
title>添加用户title>
head>
body>
form th:action="@{/save}" method="post">
用户姓名：input type="text" name="name"/>font color="red"
th:errors="${users.name}">font>br/>
用户密码：input type="password" name="password" />font
color="red" th:errors="${users.password}">font>br/>用户年龄：input type="text" name="age" />font color="red"
th:errors="${users.age}">font>br/>
input type="submit" value="OK"/>
form>
body>
html>

/**
*
* 如果想为传递的对象更改名称，可以使用@ModelAttribute("aa")这表示当
前传递的对象的 key 为 aa。
* 那么我们在页面中获取该对象的 key 也需要修改为 aa
* @param users
* @return
*/
@RequestMapping("/addUser")
public String showPage(@ModelAttribute("aa") Users users){
return "add";
}
/**
* 完成用户添加
*@Valid 开启对 Users 对象的数据校验
*BindingResult:封装了校验的结果
*/
@RequestMapping("/save")
public String saveUser(@ModelAttribute("aa") @Valid Users
users,BindingResult result){
if(result.hasErrors()){
return "add";
}
System.out.println(users);
return "ok";
}

DOCTYPE html>
html>
head>
meta charset="UTF-8">
title>添加用户title>
head>
body>
form th:action="@{/save}" method="post">
用户姓名：input type="text" name="name"/>font color="red"th:errors="${aa.name}">font>br/>
用户密码：input type="password" name="password" />font
color="red" th:errors="${aa.password}">font>br/>
用户年龄：input type="text" name="age" />font color="red"
th:errors="${aa.age}">font>br/>
input type="submit" value="OK"/>
form>
body>
html>