【SpringMVC笔记】Ajax 入门，dubbo和zookeeper面试
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encoding
org.springframework.web.filter.CharacterEncodingFilter
encoding
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applicationContext.xml：记得加 静态资源过滤 和 注解驱动配置。
<?xml version="1.0" encoding="UTF-8"?><beans xmlns=“http://www.springframework.org/schema/beans”
xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance”
xmlns:context=“http://www.springframework.org/schema/context”
xmlns:mvc=“http://www.springframework.org/schema/mvc”
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://w
ww.springframework.org/schema/mvc/spring-mvc.xsd">
<context:component-scan base-package=“com.yusael.controller”/>
mvc:default-servlet-handler/
mvc:annotation-driven/
<bean class=“org.springframework.web.servlet.view.InternalResourceViewResolver”
id=“internalResourceViewResolver”>
编写一个 AjaxController：
@RestController
public class AjaxController {
@RequestMapping("/ajax1")
public void ajax1(String name, HttpServletResponse response) throws IOException {
if (“admin”.equals(name)) {
response.getWriter().write(“true”);
} else {
response.getWriter().write(“false”);
}
}
}
编写 index.jsp 测试：
<%@ page contentType=“text/html;charset=UTF-8” language=“java” %>
<%–onblur：失去焦点触发事件–%>
用户名:
Ajax 执行流程
Ajax 异步加载数据案例
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首先写一个实体类 User：
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
private String name;
private int age;
private String sex;
}
在 Controller 中获取一个集合对象，展示到前端页面：
@RequestMapping("/ajax2")
public List ajax2() {
List list = new ArrayList<>();
list.add(new User(“zhenyu”, 21, “男”));
list.add(new User(“yusael”, 99, “男”));
list.add(new User(“hahaha”, 18, “女”));
return list; // 由于@RestController注解, 将list转成json格式返回
}
前端页面：ajaxtest.jsp
<%@ page contentType=“text/html;charset=UTF-8” language=“java” %>
Ajax 验证用户名密码
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思考一下：我们平时登录时，输入框后面的实时提示是怎么做到的？
Controller：
@RequestMapping("/ajax3")
public String ahax3(String name, String pwd) {
String msg = “”;
if (name != null) {
if (“admin”.equals(name)) {
msg = “OK”;
} else {
msg = “用户名有误!”;
}
}
if (pwd != null) {
if (“123456”.equals(pwd)) {
msg = “OK”;
} else {
msg = “密码输入有误!”;
}
}
return msg;
}
前端页面 login.jsp：
<%@ page contentType=“text/html;charset=UTF-8” language=“java” %>
用户名:
密码:
注：记得处理 JSON 乱码！
applicationContext.xml 中加入以下代码：
mvc:annotation-driven
<mvc:message-converters register-defaults=“true”>
</mvc:message-converters>
</mvc:annotation-driven>
获取 百度 接口案例
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