重定向与转发的几种方式

重定向与转发的几种方法

web.xml配置：


<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>modeAndViewservlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
        <init-param>
            <param-name>contextConfigLocationparam-name>
            <param-value>classpath:springmvc-servlet.xmlparam-value>
        init-param>
        <load-on-startup>1load-on-startup>
    servlet>
    <servlet-mapping>
        <servlet-name>modeAndViewservlet-name>
        <url-pattern>/url-pattern>
    servlet-mapping>
web-app>
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一：ServletAPI(不需视图解析器)

    @RequestMapping("/t1")
    public void test2(HttpServletRequest req, HttpServletResponse rsp) throws IOException {
        rsp.sendRedirect("/index.jsp");
    }
    @RequestMapping("/t2")
    public void test3(HttpServletRequest req, HttpServletResponse rsp) throws Exception {
        //转发
        req.setAttribute("msg","/result/t3");
        req.getRequestDispatcher("/jsp/test.jsp").forward(req,rsp);
    }
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二：通过SpringMVC来实现转发和重定向-不配置视图解析器情况下

springMvc.xml:


<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.lmy"/>
beans>
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controller:

package com.lmy;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class ModeAndViewController {

    /**
     * 不配置视图解析器-转发
     * @return
     */
    @RequestMapping("/testForward1")
    public String testForward1(Model model) {
        model.addAttribute("smg","你好");
        return "/jsp/test.jsp";
    }

    /**
     * 不配置视图解析器-转发
     * @return
     */
    @RequestMapping("/testForward2")
    public String testForward2(Model model) {
        model.addAttribute("smg","你好,转发");
        return "forward:/jsp/test.jsp";
    }

    /**
     * 不配置视图解析器-重定向
     * @return
     */
    @RequestMapping("/testRedirect")
    public String testRedirect() {
//        model.addAttribute("smg","重定向无法像转发一样携带数据");
        return "redirect:/jsp/test.jsp";
    }
}

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三：通过SpringMVC来实现转发和重定向-配置视图解析器情况下

springMvc.xml:

<?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.lmy"/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver">
        <property name="prefix" value="/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>
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controller:

package com.lmy;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class ModeAndViewController {

    /**
     * 配置视图解析器-转发
     * @return
     */
    @RequestMapping("/testForward1")
    public String testForward1(Model model) {
        model.addAttribute("smg","你好");
        return "test";
    }

    /**
     * 重定向
     * @return
     */
    @RequestMapping("/testRedirect")
    public String testRedirect() {
//        model.addAttribute("smg","重定向无法像转发一样携带数据");
        return "redirect:/jsp/test.jsp";
    }
}

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四：ModelAndView-必须配置视图解析器

设置ModelAndView对象 , 根据view的名称 , 和视图解析器跳到指定的页面 .
页面 : {视图解析器前缀} + viewName +{视图解析器后缀}

springMvc.xml:

<?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.lmy"/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver">
        <property name="prefix" value="/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>
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controller:

    @RequestMapping("/testModelAndView")
    public ModelAndView testModelAndView() {
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.addObject("smg","你好，ModelAndView 转发");
        modelAndView.setViewName("test");
        return modelAndView;
    }

    @RequestMapping("/testModelAndView2")
    public ModelAndView testModelAndView2() {
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.addObject("smg","你好，ModelAndView 重定向");
        modelAndView.setViewName("redirect:/jsp/test.jsp");
        return modelAndView;
    }
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五：总结

重定向 , 不需要视图解析器 , 本质就是重新请求一个新地址 , 所以注意路径是全路径
视图解析器路径拼接方式：
{视图解析器前缀} + viewName +{视图解析器后缀}
使用ModelAndView对象必须视图解析器

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原文地址：https://blog.csdn.net/qq_41863697/article/details/127802121