https://www.bilibili.com/video/BV1Sb411s7qa
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简单参数
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| <a href="param/testParam?username=hehe&password=123">
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| @RequestMapping("/testParam")
public String testParam(String username,String password){
}
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绑定实体类型
实体类
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| public class Account implements Serializable{
private String username;
private String password;
private Double money;
}
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表单
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| <form action="param/saveAccount" method="post">
姓名：<input type="text" name="username" /><br/>
密码：<input type="text" name="password" /><br/>
金额：<input type="text" name="money" /><br/>
<input type="submit" value="提交" />
</form>
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绑定
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@RequestMapping("/saveAccount")
public String saveAccount(Account account){
System.out.println("执行了...");
System.out.println(account);
return "success";
}
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引用类型
实体类
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| public class User implements Serializable{
private String uname;
private Integer age;
}
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| public class Account implements Serializable{
private String username;
private String password;
private Double money;
private User user;
}
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表单
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| <form action="param/saveAccount" method="post">
姓名：<input type="text" name="username" /><br/>
密码：<input type="text" name="password" /><br/>
金额：<input type="text" name="money" /><br/>
用户姓名：<input type="text" name="user.uname" /><br/>
用户年龄：<input type="text" name="user.age" /><br/>
<input type="submit" value="提交" />
</form>
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集合类型
实体类
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| public class Account implements Serializable{
private String username;
private String password;
private Double money;
private List<User> list;
private Map<String,User> map;
}
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表单
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| <form action="param/saveAccount" method="post">
姓名：<input type="text" name="username" /><br/>
密码：<input type="text" name="password" /><br/>
金额：<input type="text" name="money" /><br/>
用户姓名：<input type="text" name="list[0].uname" /><br/>
用户年龄：<input type="text" name="list[0].age" /><br/>
用户姓名：<input type="text" name="map['one'].uname" /><br/>
用户年龄：<input type="text" name="map['one'].age" /><br/>
<input type="submit" value="提交" />
</form>
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map中放key值，这里是’one’
自定义类型转换器
页面提交的数据都是字符串类型
基本类型可以自动转，如Integer
但日期类型可能不支持某些格式，需要自定义类型转换器
例如，给User加一个Date属性
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| public class User implements Serializable{
private String uname;
private Integer age;
private Date date;
}
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| <form action="param/saveUser" method="post">
用户姓名：<input type="text" name="uname" /><br/>
用户年龄：<input type="text" name="age" /><br/>
用户生日：<input type="text" name="date" /><br/>
<input type="submit" value="提交" />
</form>
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| @RequestMapping("/saveUser")
public String saveUser(User user){
System.out.println("执行了...");
System.out.println(user);
return "success";
}
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在生日框中输入”2000/11/11”发现可以正常封装
但是”2000-11-11”出现Bad Request
需要写一个类型转换类并注册
需要实现Converter接口
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| public class StringToDateConverter implements Converter<String,Date>{
public Date convert(String source) {
if(source == null){
throw new RuntimeException("请您传入数据");
}
DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
try {
return df.parse(source);
} catch (Exception e) {
throw new RuntimeException("数据类型转换出现错误");
}
}
}
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然后在springmvc.xml中配置
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<bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
<property name="converters">
<set>
<bean class="cn.itcast.utils.StringToDateConverter"/>
</set>
</property>
</bean>
<mvc:annotation-driven conversion-service="conversionService"/>
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解决中文乱码
在web.xml中
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<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
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获取Servlet原生的API
直接在方法上加参数即可
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| @RequestMapping("/testServlet")
public String testServlet(HttpServletRequest request, HttpServletResponse response){
System.out.println("执行了...");
System.out.println(request);
HttpSession session = request.getSession();
System.out.println(session);
ServletContext servletContext = session.getServletContext();
System.out.println(servletContext);
System.out.println(response);
return "success";
}
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