struts2的场景应用<s:form>

struts2的页面标签（form表单）、动态方法调用通配符（struts.xml）

重点：form表单，各种标签的属性。即如何从域中获取数据作为多选项标签的选项？

Demo组件架构如下：
图片说明

演示效果如下：

index.jsp 放一个超链接

<a href="emp-input.action">Emp Input Page</a>

经过struts.xml配置文件
```
<package extends="struts-default" name="default" namespace="/">
<action name="emp-*"
```
   class="com.atguigu.struts2.action.Employee"
   method="{1}">
   <result name="{1}">/emp-{1}.jsp</result>    
```
</package>
action类，执行的是input方法
将封装好的dept,role放到requestMap中，并返回emp-input.jsp页面进行表单的填写
public class Employee implements RequestAware{
private Map<String, Object> requestMap = null;

private Dao dao = new Dao();

private String name;
private String password;

private String gender;
private String dept;

private List<string> roles;
private String desc;</string>

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 String getGender() {
```
 return gender;
```
}

public void setGender(String gender) {
```
 this.gender = gender;
```
}

public String getDept() {
```
 return dept;
```
}

public void setDept(String dept) {
```
 this.dept = dept;
```
}

public List<string> getRoles() {</string>
```
 return roles;
```
}

public void setRoles(List<string> roles) {</string>
```
 this.roles = roles;
```
}

public String getDesc() {
```
 return desc;
```
}

public void setDesc(String desc) {
```
 this.desc = desc;
```
}
public String save() {
```
 System.out.println("save: " + this);
 return "save";
```
}

public String input() {
```
 requestMap.put("depts", dao.getDepartments());
 requestMap.put("roles", dao.getRoles());
 return "input";
```
}

@Override
public void setRequest(Map<String, Object> request) {
```
 this.requestMap = request;
```
}

@Override
public String toString() {
```
 return "Employee [name=" + name + ", password=" + password + ", gender=" + gender + ", dept=" + dept
         + ", roles=" + roles + ", desc=" + desc + "]";
```
}

}

图片说明

<s:form action="emp-save">

        <s:textfield name="name" label="Name"></s:textfield>
        <s:password name="password" label="Password"></s:password>

        <s:radio name="gender" list="#{'1':'Male','0':'Female' }" label="Gender"></s:radio>

        <s:select list="#request.depts" listKey="deptId"
            listValue="deptName" name="dept" label="Department"></s:select>
        <s:checkboxlist list="#request.roles" listKey="roleId"
            listValue="roleName" name="roles" label="Role"></s:checkboxlist>

        <s:textarea name="desc" label="Desc"></s:textarea>
        <s:submit></s:submit>

    </s:form>

4.点击表单的submit,再经过struts.xml文件调用的是action类的save方法,跳转到emp-save.jsp进行对map数据的获取

Name: ${name }
<br><br>

Password: ${password }
<br><br>

Gender: ${gender }
<br><br>

Dept: ${dept }
<br><br>

Roles: ${roles }
<br><br>

Desc: ${desc }
<br><br>

图片说明