一、跳转方式

转发

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <beans xmlns="http://www.springframework.org/schema/beans"
  3.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4.        xmlns:context="http://www.springframework.org/schema/context"
  5.        xmlns:mvc="http://www.springframework.org/schema/mvc"
  6.        xsi:schemaLocation="http://www.springframework.org/schema/beans
  7.        http://www.springframework.org/schema/beans/spring-beans.xsd
  8.        http://www.springframework.org/schema/context
  9.        https://www.springframework.org/schema/context/spring-context.xsd
  10.        http://www.springframework.org/schema/mvc
  11.        https://www.springframework.org/schema/mvc/spring-mvc.xsd">
  13.     <context:component-scan base-package="com.comprehensive.controller"/>
  14.     <mvc:default-servlet-handler/>
  15.     <mvc:annotation-driven/>
  17. </beans>
@Controller
@RequestMapping("/skip")
public class Test_skip {
    @RequestMapping("/test_forward")
    public String test_forward(Model model) {
        model.addAttribute("msg", "forward测试成功");
        return "forward:/WEB-INF/jsp/test.jsp";
    }
}

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重定向

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>$Title$</title>
  </head>
  <body>
    ${msg}
  </body>
</html>

<?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://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:component-scan base-package="com.comprehensive.controller"/>
    <mvc:default-servlet-handler/>
    <mvc:annotation-driven/>

</beans>

@Controller
@RequestMapping("/skip")
public class Test_skip {
    @RequestMapping("/test_redirect")
    public String test_redirect(Model model) {
        model.addAttribute("msg", "redirect测试成功");
        return "redirect:/index.jsp";
    }
}

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二、数据处理

配置环境

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <servlet>
        <servlet-name>SpringMVC</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>SpringMVC</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

<?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://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:component-scan base-package="com.comprehensive.controller"/>
    <mvc:default-servlet-handler/>
    <mvc:annotation-driven/>

    <!-- 视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          id="internalResourceViewResolver">
        <!-- 前缀 -->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!-- 后缀 -->
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

提交的域名称和处理方法的参数名一致

@Controller
@RequestMapping("/user")
public class UserController {
    // http://localhost:8080/user/test1?name=comprehensive
    @RequestMapping("/test1")
    public String test1(String name, Model model) {
        System.out.println(name);
        model.addAttribute("msg", name);
        return "test1";
    }
}

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提交的域名称和处理方法的参数名不一致

@Controller
@RequestMapping("/user")
public class UserController {
    // http://localhost:8080/user/test2?username=comprehensive
    @RequestMapping("/test2")
    public String test2(@RequestParam("username") String name, Model model) {
        System.out.println(name);
        model.addAttribute("msg", name);
        return "test2";
    }
}

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提交的是一个对象

有参构造方法

public class User {
    private int id;
    private String name;
    private String pwd;

    public User(int id, String name, String pwd) {
        this.id = id;
        this.name = name;
        this.pwd = pwd;
    }

    public void setId(int id) {
        this.id = id;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", pwd='" + pwd + '\'' +
                '}';
    }
}

@Controller
@RequestMapping("/user")
public class UserController {

    @RequestMapping("/test3")
    public String test3(User user, Model model) {
        System.out.println(user);
        model.addAttribute("msg", user);
        return "test3";
    }

}

setter方法

public class User {
    private int id;
    private String name;
    private String pwd;

    public void setId(int id) {
        this.id = id;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", pwd='" + pwd + '\'' +
                '}';
    }
}

@Controller
@RequestMapping("/user")
public class UserController {

    @RequestMapping("/test3")
    public String test3(User user, Model model) {
        System.out.println(user);
        model.addAttribute("msg", user);
        return "test3";
    }

}

三、数据显示到前端

ModelAndView

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ModelMap

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Model

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四、乱码问题

乱码问题发生

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>提交表单</title>
</head>
<body>
<form action="/encoding/test" method="post">
    <input type="text" name="name">
    <input type="submit">
</form>
</body>
</html>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>页面</title>
</head>
<body>
    ${msg}
</body>
</html>

@Controller
@RequestMapping("/encoding")
public class EncodingController {
    @RequestMapping("/test")
    public String test(String name, Model model) {
        model.addAttribute("msg", name);
        return "test";
    }
}

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解决乱码问题

修改tomcat配置文件：设置编码

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web.xml文件中配置过滤器

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <servlet>
        <servlet-name>SpringMVC</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>SpringMVC</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--配置SpringMVC过滤器-->
    <filter>
        <filter-name>encoding_filter</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>encoding_filter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

</web-app>

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